1
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Li X, Wang Z, Bao Y, Lu H, You J, Wang L. Oxygen Vacancy: How Will Poling History Affect Its Role in Photoelectrocatalysis. CHEMSUSCHEM 2024; 17:e202400946. [PMID: 38899379 PMCID: PMC11632579 DOI: 10.1002/cssc.202400946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 06/14/2024] [Accepted: 06/18/2024] [Indexed: 06/21/2024]
Abstract
Oxygen vacancy (VO) has been recognized to possess an effect to promote the charge separation and transfer (CST) in various n-type semiconductor based photoelectrodes. But how external stimulus will change this VO effect has not been investigated. In this work, external polarization is applied to investigate the effect of VO on the CST process of a typical ferroelectric BiFeO3 photoelectrode. It is found that negative poling treatment can significantly boost VO effect, while positive poling treatment will deteriorate the CST capability in BiFeO3 photoelectrodes. This poling history determined VO effect is rooted in the VO induced defect dipoles, wherein their alignment produces a depolarization electric field to modulate the CST driving force. This finding highlights the significance of poling history in functionalizing the VO in a photoelectrode.
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Affiliation(s)
- Xianlong Li
- Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt Lucia4072QueenslandAustralia
| | - Zhiliang Wang
- Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt Lucia4072QueenslandAustralia
| | - Yifan Bao
- Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt Lucia4072QueenslandAustralia
| | - Haijiao Lu
- Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt Lucia4072QueenslandAustralia
| | - Jiakang You
- Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt Lucia4072QueenslandAustralia
| | - Lianzhou Wang
- Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt Lucia4072QueenslandAustralia
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2
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Zaman I, Liaqat A, Athar S, Mujahid A, Afzal A. Electrocatalytic FeFe 2O 4 embedded, spermine-imprinted polypyrrole (Fe/MIPpy) nanozymes for cancer diagnosis and prognosis. J Mater Chem B 2024; 12:5898-5906. [PMID: 38779948 DOI: 10.1039/d4tb00190g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Developing synthetic materials, with enzyme-like molecular recognition capabilities, as functional receptors in electronic or electrochemical devices for the timely diagnosis of major diseases is a great challenge. Herein, we present the development of Fe/MIPpy nanozymes, characterized as enzyme-like artificial receptors, for the precise and non-invasive monitoring of cancer biomarkers in aqueous solutions and human saliva. Through the integration of PVA-stabilized FeFe2O4 nanocrystals in a molecularly imprinted conducting polypyrrole matrix, the Fe/MIPpy nanozymes demonstrate 424 nA cm-2 nM-1 sensitivity and 220 pM detection limit. Charge-transfer mechanisms, Fe/MIPpy-spermine interactions, and the principle of spermine recognition are investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The disposable Fe/MIPpy sensor operates wirelessly and offers rapid and remote quantification of spermine, making it a promising material for the development of cost-effective tools for non-invasive cancer diagnosis and prognosis.
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Affiliation(s)
- Iqra Zaman
- Sensors and Diagnostics Lab, School of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore, 54590, Pakistan.
| | - Amna Liaqat
- Sensors and Diagnostics Lab, School of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore, 54590, Pakistan.
| | - Sadaf Athar
- Sensors and Diagnostics Lab, School of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore, 54590, Pakistan.
| | - Adnan Mujahid
- Sensors and Diagnostics Lab, School of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore, 54590, Pakistan.
| | - Adeel Afzal
- Sensors and Diagnostics Lab, School of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore, 54590, Pakistan.
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3
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Yang P, Shi H, Wu H, Yu D, Huang L, Wu Y, Gong X, Xiao P, Zhang Y. Manipulating the surface states of BiVO 4 through electrochemical reduction for enhanced PEC water oxidation. NANOSCALE 2023; 15:4536-4545. [PMID: 36757266 DOI: 10.1039/d2nr07138j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Bismuth vanadate (BiVO4) is a prospective candidate for photoelectrochemical (PEC) water oxidation, but its commercial application is limited due to the serious surface charge recombination. In this work, we propose a novel and effective electrochemical reduction strategy combined with co-catalyst modification to manipulate the surface states of the BiVO4 photoanode. Specifically, an ultrathin amorphous structure is formed on the surface of BiVO4 after electrochemical reduction ascribed to the breaking of the surface metal-O bonds. Photoelectrochemical measurements and first-principles calculation show that the electrochemical reduction treatment can effectively reduce the surface energy, thereby passivating the recombined surface states (r-ss) and increasing the mobility of photogenerated holes. In addition, the FeOOH co-catalyst layer further increases the intermediate surface states (i-ss) of BiVO4, stabilizes the surface structure and enhances its PEC performance. Benefiting from the superior charge transfer efficiency and the excellent water oxidation kinetics, the -0.8/BVO/Fe photoanode achieves 2.02 mA cm-2 photocurrent at 1.23 VRHE (2.4 times that of the original BiVO4); meanwhile, the onset potential shifts 90 mV to the cathode. These results provide a new surface engineering tactic to modify the surface states of semiconductor photoanodes for high-efficiency PEC water oxidation.
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Affiliation(s)
- Peixin Yang
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Huihui Shi
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Hangfei Wu
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Duohuan Yu
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Lu Huang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Yali Wu
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Xiangnan Gong
- Analytical and Testing Center, Chongqing University, Chongqing, 401331, China
| | - Peng Xiao
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Yunhuai Zhang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
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4
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Benkó T, Shen S, Németh M, Su J, Szamosvölgyi Á, Kovács Z, Sáfrán G, Al-Zuraiji SM, Horváth EZ, Sápi A, Kónya Z, Pap JS. BiVO4 charge transfer control by a water-insoluble iron complex for solar water oxidation. APPLIED CATALYSIS A: GENERAL 2023; 652:119035. [DOI: 10.1016/j.apcata.2023.119035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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5
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Elishav O, Stone D, Tsyganok A, Jayanthi S, Ellis DS, Yeshurun T, Maor II, Levi A, Beilin V, Shter GE, Yerushalmi R, Rothschild A, Banin U, Grader GS. Composite Indium Tin Oxide Nanofibers with Embedded Hematite Nanoparticles for Photoelectrochemical Water Splitting. ACS APPLIED MATERIALS & INTERFACES 2022; 14:41851-41860. [PMID: 36094823 PMCID: PMC9501920 DOI: 10.1021/acsami.2c05424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 08/28/2022] [Indexed: 06/15/2023]
Abstract
Hematite is a classical photoanode material for photoelectrochemical water splitting due to its stability, performance, and low cost. However, the effect of particle size is still a question due to the charge transfer to the electrodes. In this work, we addressed this subject by the fabrication of a photoelectrode with hematite nanoparticles embedded in close contact with the electrode substrate. The nanoparticles were synthesized by a solvothermal method and colloidal stabilization with charged hydroxide molecules, and we were able to further use them to prepare electrodes for water photo-oxidation. Hematite nanoparticles were embedded within electrospun tin-doped indium oxide nanofibers. The fibrous layer acted as a current collector scaffold for the nanoparticles, supporting the effective transport of charge carriers. This method allows better contact of the nanoparticles with the substrate, and also, the fibrous scaffold increases the optical density of the photoelectrode. Electrodes based on nanofibers with embedded nanoparticles display significantly enhanced photoelectrochemical performance compared to their flat nanoparticle-based layer counterparts. This nanofiber architecture increases the photocurrent density and photon-to-current internal conversion efficiency by factors of 2 and 10, respectively.
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Affiliation(s)
- Oren Elishav
- The
Nancy & Stephen Grand Technion Energy Program (GTEP), Technion−Israel Institute of Technology, Haifa 3200002, Israel
| | - David Stone
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Anton Tsyganok
- Department
of Materials Science and Engineering, Technion−Israel
Institute of Technology, Haifa 3200002, Israel
| | - Swetha Jayanthi
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - David S. Ellis
- Department
of Materials Science and Engineering, Technion−Israel
Institute of Technology, Haifa 3200002, Israel
| | - Tamir Yeshurun
- Faculty
of Engineering, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Itzhak I. Maor
- The
Wolfson Department of Chemical Engineering, Technion−Israel Institute of Technology, Haifa 3200003 Israel
| | - Adar Levi
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Vadim Beilin
- The
Wolfson Department of Chemical Engineering, Technion−Israel Institute of Technology, Haifa 3200003 Israel
| | - Gennady E. Shter
- The
Wolfson Department of Chemical Engineering, Technion−Israel Institute of Technology, Haifa 3200003 Israel
| | - Roie Yerushalmi
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Avner Rothschild
- The
Nancy & Stephen Grand Technion Energy Program (GTEP), Technion−Israel Institute of Technology, Haifa 3200002, Israel
- Department
of Materials Science and Engineering, Technion−Israel
Institute of Technology, Haifa 3200002, Israel
| | - Uri Banin
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Gideon S. Grader
- The
Nancy & Stephen Grand Technion Energy Program (GTEP), Technion−Israel Institute of Technology, Haifa 3200002, Israel
- The
Wolfson Department of Chemical Engineering, Technion−Israel Institute of Technology, Haifa 3200003 Israel
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6
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Li L, Zhang J, Zhang Q, Wang X, Dai WL. Superior sponge-like carbon self-doping graphitic carbon nitride nanosheets derived from supramolecular pre-assembly of a melamine-cyanuric acid complex for photocatalytic H 2 evolution. NANOTECHNOLOGY 2021; 32:155604. [PMID: 33361568 DOI: 10.1088/1361-6528/abd6d1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The photocatalytic evolution of hydrogen (H2) from water splitting is considered a promising route to overcome the energy crisis, and the key lies in the preparation of efficient photocatalysts. Herein, superior ordered sponge-like carbon self-doped graphitic carbon nitride (g-C3N4) nanosheets (SCCNS) were prepared via a combined strategy of melamine-cyanuric acid complex supramolecular pre-assembly and solvothermal pre-treatment using ethylene glycol (EG) aqueous solutions (EG:water = 50:50 vol.%) as a solvent and carbon doping source. The following pyrolysis converts the naturally arranged melamine-EG-cyanuric acid supramolecular intermediates to highly crystalline SCCNS with large specific surface areas. The optimal SCCNS-180 exhibits superior photocatalytic H2 evolution activities (∼4393 and 11 320 μmol h-1 g-1) when irradiated with visible light and simulated sunlight; these values are up to ∼17- and ∼18-fold higher than that of bulk g-C3N4. The quantum efficiency of SCCNS-180 at λ = 420 nm can reach 6.0%. The excellent photocatalytic performance of SCCNS-180 derives from its distinct ordered sponge-like nanosheet structure with highly crystallinity and the carbon doping, leading to its improved optical absorption, accelerated photoinduced electron-hole pair transfer and separation rate and enlarged specific surface area (134.4 m2 g-1).
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Affiliation(s)
- Lingfeng Li
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Juhua Zhang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Quan Zhang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Xiaohao Wang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Wei-Lin Dai
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
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7
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Controlling phase fraction and crystal orientation via thermal oxidation of iron foils for enhanced photoelectrochemical performance. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.01.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Mechanism on BiVO4 photoanode photoelectrochemical performance improving: Based on surface electrochemical reduction method. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137288] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Cu+ based active sites of different oxides supported Pd-Cu catalysts and electrolytic in-situ H2 evolution for high-efficiency nitrate reduction reaction. J Catal 2020. [DOI: 10.1016/j.jcat.2020.10.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Visible-light-driven photocatalytic activity of ZnO/g-C3N4 heterojunction for the green synthesis of biologically interest small molecules of thiazolidinones. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112786] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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11
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Yang JX, Meng Y, Tseng CM, Huang YK, Lin TM, Wang YM, Deng JP, Wu HC, Hung WH. Enhancing Water-Splitting Efficiency Using a Zn/Sn-Doped PN Photoelectrode of Pseudocubic α-Fe 2O 3 Nanoparticles. NANOSCALE RESEARCH LETTERS 2020; 15:130. [PMID: 32542412 PMCID: PMC7295917 DOI: 10.1186/s11671-020-03362-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
α-Phase hematite photoelectrodes can split water. This material is nontoxic, inexpensive, and chemically stable; its low energy gap of 2.3 eV absorbs light with wavelengths lower than 550 nm, accounting for approximately 30% of solar energy. Previously, we reported polyhedral pseudocubic α-Fe2O3 nanocrystals using a facile hydrothermal route to increase spatial charge separation, enhancing the photocurrent of photocatalytic activity in the water-splitting process. Here, we propose a p-n junction structure in the photoanode of pseudocubic α-Fe2O3 to improve short carrier diffusion length, which limits its photocatalytic efficiency. We dope Zn on top of an Fe2O3 photoanode to form a layer of p-type semiconductor material; Sn is doped from the FTO substrate to form a layer of n-type semiconductor material. The p-n junction, n-type Fe2O3:Sn and p-type Fe2O3:Zn, increase light absorption and charge separation caused by the internal electric field in the p-n junction.
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Affiliation(s)
- Jie-Xiang Yang
- Institute of Materials Science and Engineering, National Central University, Taoyuan, 32001, Taiwan
- Department of Materials Science and Engineering, Feng Chia University, Taichung, 40724, Taiwan
| | - Yongtao Meng
- College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Chuan-Ming Tseng
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan.
- Center for Plasma and Thin Film Technologies, Ming Chi University of Technology, New Taipei City, 24301, Taiwan.
| | - Yan-Kai Huang
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
| | - Tung-Ming Lin
- Institute of Materials Science and Engineering, National Central University, Taoyuan, 32001, Taiwan
- Department of Materials Science and Engineering, Feng Chia University, Taichung, 40724, Taiwan
| | - Yang-Ming Wang
- Institute of Materials Science and Engineering, National Central University, Taoyuan, 32001, Taiwan
- Department of Materials Science and Engineering, Feng Chia University, Taichung, 40724, Taiwan
| | - Jin-Pei Deng
- Department of Chemistry, Tamkang University, New Taipei City, 25137, Taiwan
| | - Hsiang-Chiu Wu
- Department of Mechanical Engineering, National Chung Cheng University, Chiayi, 621301, Taiwan
| | - Wei-Hsuan Hung
- Institute of Materials Science and Engineering, National Central University, Taoyuan, 32001, Taiwan.
- High Entropy Materials Center, National Tsing Hua University, Hsinchu, 30013, Taiwan.
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12
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Two-Dimensional Materials and Composites as Potential Water Splitting Photocatalysts: A Review. Catalysts 2020. [DOI: 10.3390/catal10040464] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Hydrogen production via water dissociation under exposure to sunlight has emanated as an environmentally friendly, highly productive and expedient process to overcome the energy production and consumption gap, while evading the challenges of fossil fuel depletion and ecological contamination. Various classes of materials are being explored as viable photocatalysts to achieve this purpose, among which, the two-dimensional materials have emerged as prominent candidates, having the intrinsic advantages of visible light sensitivity; structural and chemical tuneability; extensively exposed surface area; and flexibility to form composites and heterostructures. In an abridged manner, the common types of 2D photocatalysts, their position as potential contenders in photocatalytic processes, their derivatives and their modifications are described herein, as it all applies to achieving the coveted chemical and physical properties by fine-tuning the synthesis techniques, precursor ingredients and nano-structural alterations.
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13
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Zhao H, Jiang M, Kang Q, Liu L, Zhang N, Wang P, Zhou F. Electrocatalytic oxygen and hydrogen evolution reactions at Ni 3B/Fe 2O 3 nanotube arrays under visible light radiation. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01071e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We demonstrate that arrays of Ni3B/Fe2O3 nanotubes supported by Fe foil can simultaneously boost the kinetics of the oxygen evolution reaction and hydrogen evolution reaction after exposure to visible light radiation.
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Affiliation(s)
- Hui Zhao
- Institute of Surface Analysis and Chemical Biology
- University of Jinan
- Jinan
- P. R. China
| | - Meng Jiang
- Institute of Surface Analysis and Chemical Biology
- University of Jinan
- Jinan
- P. R. China
| | - Qing Kang
- Institute of Surface Analysis and Chemical Biology
- University of Jinan
- Jinan
- P. R. China
| | - Lequan Liu
- TJU-NIMS International Collaboration Laboratory
- Key Lab of Advanced Ceramics and Machining Technology (Ministry of Education)
- Tianjin Key Laboratory of Composite and Functional Materials
- School of Material Science and Engineering
- Tianjin University
| | - Ning Zhang
- School of Materials Science and Engineering
- Central South University
- Changsha
- P. R. China
| | - Pengcheng Wang
- Institute of Surface Analysis and Chemical Biology
- University of Jinan
- Jinan
- P. R. China
| | - Feimeng Zhou
- Institute of Surface Analysis and Chemical Biology
- University of Jinan
- Jinan
- P. R. China
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14
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Zhang H, Park JH, Byun WJ, Song MH, Lee JS. Activating the surface and bulk of hematite photoanodes to improve solar water splitting. Chem Sci 2019; 10:10436-10444. [PMID: 32110336 PMCID: PMC6988740 DOI: 10.1039/c9sc04110a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 09/30/2019] [Indexed: 11/21/2022] Open
Abstract
A simple electrochemical activation treatment is proposed to improve effectively the photoelectrochemical performance of Nb,Sn co-doped hematite nanorods. The activation process involves an initial thrice cathodic scanning (reduction) and a subsequent thrice anodic scanning (oxidation), which modifies both the surface and bulk properties of the Nb,Sn:Fe2O3 photoanode. First, it selectively removes the surface components to different extents endowing the hematite surface with fewer defects and richer Nb-O and Sn-O bonds and thus passivates the surface trap states. The surface passivation effect also enhances the photoelectrochemical stability of the photoanode. Finally, more Fe2+ ions or oxygen vacancies are generated in the bulk of hematite to enhance its conductivity. As a result, the photocurrent density is increased by 62.3% from 1.88 to 3.05 mA cm-2 at 1.23 VRHE, the photocurrent onset potential shifts cathodically by ∼70 mV, and photoelectrochemical stability improves remarkably relative to the pristine photoanode under simulated sunlight (100 mW cm-2).
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Affiliation(s)
- Hemin Zhang
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea .
| | - Jong Hyun Park
- Perovtronics Research Center , Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50 , Ulsan , 44919 , Republic of Korea
| | - Woo Jin Byun
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea .
| | - Myoung Hoon Song
- Perovtronics Research Center , Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50 , Ulsan , 44919 , Republic of Korea
| | - Jae Sung Lee
- School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea .
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15
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Zhang Y, Xiao J, Xie X, Chen H, Deng S. Layer dependence of the photoelectrochemical performance of a WSe2 photocathode characterized using in situ microscale measurements. RSC Adv 2019; 9:30925-30931. [PMID: 35529380 PMCID: PMC9072204 DOI: 10.1039/c9ra06297a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 09/23/2019] [Indexed: 11/21/2022] Open
Abstract
Transition-metal dichalcogenide (TMD) materials are good candidates for photoelectrochemical (PEC) electrode materials because of their distinctive optoelectronic properties and catalytic activities. Monolayer WSe2 is a p-type semiconductor with a direct bandgap that makes it a suitable PEC cathode material. In the present work, in situ PEC characterization of a single sheet device was carried out at the microscale to explore its performance. The PEC characteristics were found to be strongly related to the number of WSe2 layers. Monolayer WSe2 exhibited a dominant large current density and incident photo-to-current efficiency (IPCE) compared with those of multilayer WSe2. Its PEC performance decreased with increasing number of layers. The photocurrent mapping results also revealed that the basal-plane sites and the edge sites on a monolayer WSe2 sheet contributed equally to its catalytic activity, which is not consistent with traditional catalyst theory. The underlying mechanism is discussed. The performance of WSe2 PEC cathode increased with decreasing number of layers. Monolayer WSe2 exhibited best PEC characteristics and IPCE efficiency. The basal-plane of WSe2 sheet had the same PEC catalytic activity with the edge sites.![]()
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Affiliation(s)
- Yu Zhang
- State Key Laboratory of Optoelectronic Materials and Technologies
- Guangdong Province Key Laboratory of Display Material and Technology
- School of Electronics and Information Technology
- Sun Yat-sen University
- Guangzhou 510275
| | - Jingwei Xiao
- State Key Laboratory of Optoelectronic Materials and Technologies
- Guangdong Province Key Laboratory of Display Material and Technology
- School of Electronics and Information Technology
- Sun Yat-sen University
- Guangzhou 510275
| | - Xi Xie
- State Key Laboratory of Optoelectronic Materials and Technologies
- Guangdong Province Key Laboratory of Display Material and Technology
- School of Electronics and Information Technology
- Sun Yat-sen University
- Guangzhou 510275
| | - Huanjun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies
- Guangdong Province Key Laboratory of Display Material and Technology
- School of Electronics and Information Technology
- Sun Yat-sen University
- Guangzhou 510275
| | - Shaozhi Deng
- State Key Laboratory of Optoelectronic Materials and Technologies
- Guangdong Province Key Laboratory of Display Material and Technology
- School of Electronics and Information Technology
- Sun Yat-sen University
- Guangzhou 510275
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16
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Multifarious function layers photoanode based on g-C 3 N 4 for photoelectrochemical water splitting. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(18)63079-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Mathew G, Dey P, Das R, Chowdhury SD, Paul Das M, Veluswamy P, Neppolian B, Das J. Direct electrochemical reduction of hematite decorated graphene oxide (α-Fe 2O 3@erGO) nanocomposite for selective detection of Parkinson's disease biomarker. Biosens Bioelectron 2018; 115:53-60. [PMID: 29800831 DOI: 10.1016/j.bios.2018.05.024] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2018] [Revised: 05/10/2018] [Accepted: 05/11/2018] [Indexed: 01/17/2023]
Abstract
An unusual approach is reported herein to fabricate magnetic hematite (α-Fe2O3) decorated electrochemically reduced graphene oxide (α-Fe2O3@erGO) nanocomposite. The method utilizes direct electrochemical reduction of self-assembled, ex-situ synthesized α-Fe2O3 anchored GO to erGO (α-Fe2O3@erGO) on glassy carbon electrode (GCE) for selective detection dopamine (DA), an important biomarker of Parkinson's disease. The formation of α-Fe2O3@erGO/GCE has been confirmed by XPS and Raman spectroscopy. α-Fe2O3@erGO modified GCE exhibits synergistic catalytic activity nearly 2.2 and 5 fold higher than α-Fe2O3@GO and other modified electrodes, respectively towards oxidation of DA. The fabricated sensor exhibited linear dynamic ranges over 0.25 - 100 µM in response to DA with a LOD of 0.024 µM (S/N = 3), LOQ of 0.08 µM (S/N = 10), and a sensitivity of 12.56 µA µM-1 cm-2. Finally, the practical analytical application of the proposed α-Fe2O3@erGO/GCE was investigated for the determination of DA in commercially available pharmaceutical formulation and human serum samples, and showed satisfactory recovery results towards DA.
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Affiliation(s)
- Georgeena Mathew
- SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - Parama Dey
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - Rituparna Das
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - Sreemayee Dutta Chowdhury
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - Merina Paul Das
- Department of Industrial Biotechnology, Bharath Institute of Higher Education and Research, Chennai 600073, Tamil Nadu, India
| | | | - Bernaurdshaw Neppolian
- SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India.
| | - Jayabrata Das
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India.
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18
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Wang J, Wang M, Zhang T, Wang Z, Guo P, Su J, Guo L. Facile Synthesis of Ultrafine Hematite Nanowire Arrays in Mixed Water-Ethanol-Acetic Acid Solution for Enhanced Charge Transport and Separation. ACS APPLIED MATERIALS & INTERFACES 2018; 10:12594-12602. [PMID: 29577716 DOI: 10.1021/acsami.7b18534] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nanostructure engineering is of great significance for semiconductor electrode to achieve high photoelectrochemical performance. Herein, we report a novel strategy to fabricate ultrafine hematite (α-Fe2O3) nanowire arrays in a mixed water-ethanol-acetic acid (WEA) solvent. To the best of our knowledge, this is the first report on direct growth of ultrafine (∼10 nm) α-Fe2O3 nanowire arrays on fluorine-doped tin oxide substrates through solution-based fabrication process. The effect of WEA ratio on the morphology of nanowires has been systematically studied to understand the formation mechanism. Photoelectrochemical measurements were conducted on both Ti-treated α-Fe2O3 nanowire and nanorod photoelectrodes. It reveals that α-Fe2O3 nanowire electrode has higher photocurrent and charge separation efficiencies than nanorod electrode if the carrier concentration and space-charge carrier width are in the same order of magnitude. Normalized by electrochemically active surface area, the Ti-treated α-Fe2O3 nanowire electrode obtains 6.4 times higher specific photocurrent density than nanorod electrode. This superiority of nanowires arises from the higher bulk and surface charge separation efficiencies, which could be partly attributed to reduced distance that holes must transfer to reach the semiconductor-liquid junction.
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Affiliation(s)
- Jian Wang
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
| | - Menglong Wang
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
| | - Tao Zhang
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
| | - Zhiqiang Wang
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
| | - Penghui Guo
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
| | - Jinzhan Su
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
| | - Liejin Guo
- International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering , Xi'an Jiaotong University , Xi'an , Shaanxi 710049 , China
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19
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Li JM, Wang YT, Hsu YJ. A more accurate, reliable method to evaluate the photoelectrochemical performance of semiconductor electrode without under/over estimation. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.02.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Kadam SR, Panmand RP, Tekale S, Khore S, Terashima C, Gosavi SW, Fujishima A, Kale BB. Hierarchical CdMoO4 nanowire–graphene composite for photocatalytic hydrogen generation under natural sunlight. RSC Adv 2018; 8:13764-13771. [PMID: 35539346 PMCID: PMC9079877 DOI: 10.1039/c8ra01557k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 03/17/2018] [Indexed: 11/21/2022] Open
Abstract
Herein, a facile in situ solvothermal technique for the synthesis of a CdMoO4/graphene composite photocatalyst for hydrogen generation under natural solar light.
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Affiliation(s)
- Sunil R. Kadam
- Centre for Advanced Studies in Materials Science
- Department of Physics
- Savitribai Phule Pune University
- (Formerly University of Pune) Ganeshkhind
- Pune-411007
| | - Rajendra P. Panmand
- Centre for Materials for Electronics Technology (C-MET)
- Ministry of Electronics and Information Technology (MeitY)
- Government of India
- Pune-411008
- India
| | - Shashikant Tekale
- Centre for Materials for Electronics Technology (C-MET)
- Ministry of Electronics and Information Technology (MeitY)
- Government of India
- Pune-411008
- India
| | - Supriya Khore
- Centre for Materials for Electronics Technology (C-MET)
- Ministry of Electronics and Information Technology (MeitY)
- Government of India
- Pune-411008
- India
| | - Chiaki Terashima
- Photocatalysis International Research Center
- Research Institute for Science & Technology
- Tokyo University of Science
- Chiba 278-8510
- Japan
| | - Suresh W. Gosavi
- Centre for Advanced Studies in Materials Science
- Department of Physics
- Savitribai Phule Pune University
- (Formerly University of Pune) Ganeshkhind
- Pune-411007
| | - Akira Fujishima
- Photocatalysis International Research Center
- Research Institute for Science & Technology
- Tokyo University of Science
- Chiba 278-8510
- Japan
| | - Bharat B. Kale
- Centre for Materials for Electronics Technology (C-MET)
- Ministry of Electronics and Information Technology (MeitY)
- Government of India
- Pune-411008
- India
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21
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Kang S, Jang J, Pawar RC, Ahn SH, Lee CS. Low temperature fabrication of Fe2O3 nanorod film coated with ultra-thin g-C3N4 for a direct z-scheme exerting photocatalytic activities. RSC Adv 2018; 8:33600-33613. [PMID: 35548797 PMCID: PMC9086564 DOI: 10.1039/c8ra04499f] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Accepted: 09/18/2018] [Indexed: 01/04/2023] Open
Abstract
We engineered high aspect ratio Fe2O3 nanorods (with an aspect ratio of 17 : 1) coated with g-C3N4 using a sequential solvothermal method at very low temperature followed by a thermal evaporation method. Here, the high aspect ratio Fe2O3 nanorods were directly grown onto the FTO substrate under relatively low pressure conditions. The g-C3N4 was coated onto a uniform Fe2O3 nanorod film as the heterostructure, exhibiting rational band conduction and a valence band that engaged in surface photoredox reactions by a direct z-scheme mechanism. The heterostructures, particularly 0.75g-C3N4@Fe2O3 nanorods, exhibited outstanding photocatalytic activities compared to those of bare Fe2O3 nanorods. In terms of 4-nitrophenol degradation, 0.75g-C3N4@Fe2O3 nanorods degraded all of the organic pollutant within 6 h under visible irradiation at a kinetic constant of 12.71 × 10−3 min−1, about 15-fold more rapidly than bare Fe2O3. Further, the hydrogen evolution rate was 37.06 μmol h−1 g−1, 39-fold higher than that of bare Fe2O3. We suggest that electron and hole pairs are efficiently separated in g-C3N4@Fe2O3 nanorods, thus accelerating surface photoreaction via a direct z-scheme under visible illumination. The engineered high aspect ratio of Fe2O3 nanorods coated with g-C3N4 demonstrates z-scheme mechanism, showing the best performance in 4-nitrophenol photodegradation and H2 evolution.![]()
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Affiliation(s)
- Suhee Kang
- Department of Materials and Chemical Engineering
- Hanyang University
- Ansan
- South Korea
| | - Joonyoung Jang
- Department of Materials and Chemical Engineering
- Hanyang University
- Ansan
- South Korea
| | | | - Sung-Hoon Ahn
- Department of Mechanical and Aerospace Engineering
- Seoul National University
- Seoul
- South Korea
| | - Caroline Sunyong Lee
- Department of Materials and Chemical Engineering
- Hanyang University
- Ansan
- South Korea
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22
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Kang S, Jang J, Pawar RC, Ahn S, Lee CS. Direct coating of a g-C3N4 layer onto one-dimensional TiO2 nanocluster/nanorod films for photoactive applications. Dalton Trans 2018; 47:7237-7244. [DOI: 10.1039/c8dt01348a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We report highly stable photoanode, coating of metal-free graphitic carbon nitride (g-C3N4) onto titanium dioxide(TiO2) nanorods with secondary nanoclusters.
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Affiliation(s)
- Suhee Kang
- Department of Materials and Chemical Engineering
- Hanyang University
- Ansan
- Korea
| | - Joonyoung Jang
- Department of Materials and Chemical Engineering
- Hanyang University
- Ansan
- Korea
| | | | - Sunghoon Ahn
- Department of Mechanical and Aerospace Engineering
- Seoul National University
- Seoul
- Korea
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23
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Phuan YW, Ong WJ, Chong MN, Ocon JD. Prospects of electrochemically synthesized hematite photoanodes for photoelectrochemical water splitting: A review. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2017. [DOI: 10.1016/j.jphotochemrev.2017.10.001] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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24
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Chen B, Fan W, Mao B, Shen H, Shi W. Enhanced photoelectrochemical water oxidation performance of a hematite photoanode by decorating with Au–Pt core–shell nanoparticles. Dalton Trans 2017; 46:16050-16057. [DOI: 10.1039/c7dt03838k] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The charge transfer process of the AuPt/α-Fe2O3 composite photoanode for photoelectrochemical water oxidation.
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Affiliation(s)
- Biyi Chen
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang
- P. R. China
| | - Weiqiang Fan
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang
- P. R. China
| | - Baodong Mao
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang
- P. R. China
| | - Hao Shen
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang
- P. R. China
| | - Weidong Shi
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang
- P. R. China
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