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Altomare M, Qin S, Saveleva VA, Badura Z, Tomanec O, Mazare A, Zoppellaro G, Vertova A, Taglietti A, Minguzzi A, Ghigna P, Schmuki P. Metastable Ni(I)-TiO 2-x Photocatalysts: Self-Amplifying H 2 Evolution from Plain Water without Noble Metal Co-Catalyst and Sacrificial Agent. J Am Chem Soc 2023; 145:26122-26132. [PMID: 37984877 DOI: 10.1021/jacs.3c08199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Decoration of semiconductor photocatalysts with cocatalysts is generally done by a step-by-step assembly process. Here, we describe the self-assembling and self-activating nature of a photocatalytic system that forms under illumination of reduced anatase TiO2 nanoparticles in an aqueous Ni2+ solution. UV illumination creates in situ a Ni+/TiO2/Ti3+ photocatalyst that self-activates and, over time, produces H2 at a higher rate. In situ X-ray absorption spectroscopy and electron paramagnetic resonance spectroscopy show that key to self-assembly and self-activation is the light-induced formation of defects in the semiconductor, which enables the formation of monovalent nickel (Ni+) surface states. Metallic nickel states, i.e., Ni0, do not form under the dark (resting state) or under illumination (active state). Once the catalyst is assembled, the Ni+ surface states act as electron relay for electron transfer to form H2 from water, in the absence of sacrificial species or noble metal cocatalysts.
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Affiliation(s)
- Marco Altomare
- PhotoCatalytic Synthesis PCS Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede 7500 AE, The Netherlands
| | - Shanshan Qin
- Department Materials Science WW-4, LKO, Friedrich-Alexander-University of Erlangen-Nuremberg (FAU), Erlangen 91058, Germany
| | - Viktoriia A Saveleva
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, CS40220, Grenoble Cedex 9 38043, France
| | - Zdenek Badura
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
- Nanotechnology Centre, VŠB - Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic
| | - Ondrej Tomanec
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
| | - Anca Mazare
- Department Materials Science WW-4, LKO, Friedrich-Alexander-University of Erlangen-Nuremberg (FAU), Erlangen 91058, Germany
| | - Giorgio Zoppellaro
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
- Nanotechnology Centre, VŠB - Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic
| | - Alberto Vertova
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milan 20133, Italy
| | - Angelo Taglietti
- Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 13, Pavia 27100, Italy
| | - Alessandro Minguzzi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milan 20133, Italy
| | - Paolo Ghigna
- Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 13, Pavia 27100, Italy
| | - Patrik Schmuki
- Department Materials Science WW-4, LKO, Friedrich-Alexander-University of Erlangen-Nuremberg (FAU), Erlangen 91058, Germany
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University Olomouc, Křížkovského 511/8, Olomouc 779 00, Czech Republic
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Sun X, Ming J, Ma Q, Zhang C, Zhu Y, An G, Chen G, Yang Y. Fabrication of optimal oxygen vacancy amount in P/Ag/Ag 2O/Ag 3PO 4/TiO 2 through a green photoreduction process for sustainable H 2 evolution under solar light. J Colloid Interface Sci 2023; 645:176-187. [PMID: 37148683 DOI: 10.1016/j.jcis.2023.04.085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 04/18/2023] [Accepted: 04/19/2023] [Indexed: 05/08/2023]
Abstract
Defects engineering on photocatalysts such as oxygen vacancies (OVs) is an effective approach for improving photocatalytic hydrogen (H2) evolution efficiency. In this study, OVs modified P/Ag/Ag2O/Ag3PO4/TiO2 (PAgT) composite was successfully fabricated via a photoreduction process by controlling the ratio of PAgT to ethanol (16, 12, 8, 6 and 4 g·L-1) under simulated solar light irradiation for the first time. Characterization methods confirmed the presence of OVs in the modified catalysts. Meanwhile, the OVs amount and their effects on the light absorption ability, charge transfer rate, conduction band and H2 evolution efficiency of the catalysts were also investigated. The results indicated that the optimal OVs amount endowed OVs-PAgT-12 with the strongest light absorption, the fastest electron transfer rate and suitable band gap for H2 evolution, leading to the highest H2 yield (863 μmol·h-1·g-1) under solar light irradiation. Moreover, OVs-PAgT-12 exhibited a superior stability during cyclic experiment, indicating its great potential for practical application. Furthermore, a sustainable H2 evolution process was proposed based on a combination of sustainable bio-ethanol resource, stable OVs-PAgT, abundant solar energy and recyclable methanol. This study would provide new insights into the design of defects modified composite photocatalyst for enhanced solar-to-hydrogen conversion.
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Affiliation(s)
- Xiang Sun
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Jie Ming
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Qiansu Ma
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Cheng Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Yunxin Zhu
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Guangqi An
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
| | - Guoping Chen
- Research Center of Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Yingnan Yang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan.
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Wu SM, Hwang I, Osuagwu B, Will J, Wu Z, Sarma BB, Pu FF, Wang LY, Badura Z, Zoppellaro G, Spiecker E, Schmuki P. Fluorine Aided Stabilization of Pt Single Atoms on TiO 2 Nanosheets and Strongly Enhanced Photocatalytic H 2 Evolution. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Si-Ming Wu
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany
| | - Imgon Hwang
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany
| | - Benedict Osuagwu
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany
| | - Johannes Will
- Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), University of Erlangen-Nuremberg, IZNF, Cauerstraße 3, 91058 Erlangen, Germany
| | - Zhenni Wu
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany
| | - Bidyut Bikash Sarma
- Institute of Catalysis Research and Technology (IKFT) and Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Fu-Fei Pu
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Li-Ying Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan, 430071, China
| | - Zdenek Badura
- Regional Centre of Advanced Technologies and Materials, Šlechtitelů 27, Olomouc 78371, Czech Republic
| | - Giorgio Zoppellaro
- Regional Centre of Advanced Technologies and Materials, Šlechtitelů 27, Olomouc 78371, Czech Republic
| | - Erdmann Spiecker
- Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), University of Erlangen-Nuremberg, IZNF, Cauerstraße 3, 91058 Erlangen, Germany
| | - Patrik Schmuki
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany
- Regional Centre of Advanced Technologies and Materials, Šlechtitelů 27, Olomouc 78371, Czech Republic
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21569, Saudi Arabia
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