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Xu S, Ding X, Shi H, Zhang X, Sun X, Ji N, Zhang X, Zhang Z. EA-Directing Formamidinium-Based Perovskite Microwires with A-Site Doping. ACS OMEGA 2021; 6:7157-7164. [PMID: 33748629 PMCID: PMC7970562 DOI: 10.1021/acsomega.1c00213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
One recent development to improve optoelectronic properties of perovskites is to use a larger cation for multication engineering. The chain-like ethylammonium (EA) [(C2H5)NH3]+ cation is more likely to form a one-dimensional perovskite structure; however, there is no remarkable evidence in this connection. Therefore, in this work, for the first time, the EA cation as an alternative cation was introduced into FAPbBr3 cubic crystals to explore the stabilities and optoelectronic properties of mixed FA x EA(1-x)PbBr3 perovskites. The results indicate that replacing FA with EA is a more effective way to realize band gap tuning and morphology transformation between the cubic shape and microwires. The tuned band gap of perovskite is due to the variation of Pb-Br-Pb angles induced by the insertion of the larger EA cation. We highlight that this work provides new physical insights into the correlation between the engineering of organic cations and the formation of perovskite microwires and the tunable band gap. This observation will help us to find new ways to grow perovskite microwires and subsequently study the optoelectronic performance of low-dimensional perovskites devices.
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Affiliation(s)
- Shan Xu
- School
of Science and Engineering and Shenzhen Key Lab of Semiconductor Lasers, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
- School
of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China
- Department
of Optics and Optical Engineering, University
of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xue Ding
- School
of Science and Engineering and Shenzhen Key Lab of Semiconductor Lasers, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
| | - Huafeng Shi
- Southern
University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Xinhai Zhang
- Southern
University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Xiaowei Sun
- Southern
University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Ning Ji
- School
of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China
| | - Xiaoli Zhang
- School
of Science and Engineering and Shenzhen Key Lab of Semiconductor Lasers, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
| | - Zhaoyu Zhang
- School
of Science and Engineering and Shenzhen Key Lab of Semiconductor Lasers, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
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Fan X, Wu T, Yang Y, Li S, Li Y, Jiao T, Gu J. Porous FeO x /carbon nanocomposites with different iron oxidation degree for building high-performance lithium ion batteries. NANOTECHNOLOGY 2020; 31:285403. [PMID: 32252037 DOI: 10.1088/1361-6528/ab86e9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Transition metal oxides have attracted lots of interest for lithium ion battery (LIB) due to the high theoretical capacity, however, the large specific volume change, low electrical conductivity and slow intrinsic lithiation/delithiation still limit the practical applications. In order to overcome the challenge, a novel type of high temperature annealing treatment for the synthesis of 3D porous FeO x nanocrystals embedded in a partially carbon matrix as an example for high-performance LIB is reported. The FeO x /carbon nanocomposites with coral-like architecture achieved at 700 °C (F700) exhibit good long term cyclability with a reversible capacity 1012 mAh g-1 remain after 500 cycles at 1.0 A g-1 and the high rate capacity with a reversible capacity of 233 mAh g-1 even at extremely high current density of 20 A g-1. These excellent electrochemical performances could be attributed to the 3D porous structure and carbon coating, which could not only provide excellent electronic conductivity and enough elastic buffer space to accommodate volume changes upon lithium insertion/extraction, but also effectively avoid agglomeration of the Fe3O4 nanocrystals and maintain the structural integrity of the electrode during the charge/discharge process.
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Affiliation(s)
- Xiaoyong Fan
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China. School of Materials Science and Engineering, Chang'an University, Xi'an, Shaanxi, People's Republic of China
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Feng M, Gu J, Zhang GC, Xu M, Yu Y, Liu X, Wang Z, Yin B, Liu Y, Liu S. Homogeneous nickel bicarbonate nanocrystals as electrode materials for high-performance asymmetric supercapacitors. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2019.121084] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Chu Y, Zhong J, Fang Z, Yang Y, Qi J, Yu S, Gu J. Ni(HCO 3) 2 nanosheet/nickel tetraphosphate (Ni(P 4O 11)) nanowire composite as a high-performance electrode material for asymmetric supercapacitors. NANOTECHNOLOGY 2020; 31:015401. [PMID: 31530760 DOI: 10.1088/1361-6528/ab4530] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Nickel compounds, especially Ni(HCO3)2 (here denoted as NiC), have been widely combined with other materials to obtain composites with a more favorable structure that exhibit excellent electrochemical performance as supercapacitors. Unfortunately, the complicated processes for preparing such composites directly restrict their further application. Herein, we prepared a NiC/nickel tetraphosphate (Ni(P4O11)) nanocomposite (NiC/NiP) by introducing [Formula: see text] ions into the NiC reaction system; this composite can be applied in high-performance supercapacitors. The micromorphology of NiC/NiP material displayed an appropriate combination of NiP nanowires and thin NiC nanosheets, which provide sufficient active sites, short ion diffusion paths and fast ion diffusion speeds. NiC/NiP material exhibited an excellent rate performance of 70.2% retained capacity, although the current was increased by 15 times (1196 F g-1 at 2.0 A g-1 and 840 F g-1 at 30 A g-1). The energy density of a NiC/NiP//active carbon (AC) asymmetric supercapacitor fabricated in 6 M KOH was as much as 39.02 W h kg-1 and 26.67 W h kg-1 under corresponding power densities of 160 W kg-1 and 8000 W kg-1, respectively. The asymmetric supercapacitor delivered a stable cyclic performance of 78% capacitive retention after 5000 continuous charge/discharge cycles. More importantly, a 2.5 V light-emitting diode was lit successfully by two NiC/NiP//AC asymmetric supercapacitors in series. These results confirm that NiC/NiP nanocomposite has great potential in practical applications of electrochemical energy storage devices.
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Affiliation(s)
- Yuzhu Chu
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Jinling Zhong
- Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Department of Electrical Engineering, Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Zixun Fang
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - You Yang
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Junyu Qi
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Shengxue Yu
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Jianmin Gu
- State Key Laboratory of Metastable Materials Science and Technology (MMST), Yanshan University, Qinhuangdao 066004, People's Republic of China
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, People's Republic of China
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Yin B, Gu J, Feng M, Zhang GC, Zhang Z, Zhong J, Zhang C, Wen B, Zhao YS. Epitaxial growth of dual-color-emitting organic heterostructures via binary solvent synergism driven sequential crystallization. NANOSCALE 2019; 11:7111-7116. [PMID: 30644935 DOI: 10.1039/c8nr08066f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The controlled construction of organic heterostructured architectures derived from molecules with similar nucleation thresholds and concentrations has been rare and remains a great challenge. Herein, we report a sequential epitaxial growth to synthesize dual-color-emitting organic heterostructures with 9,10-bis(phenylethynyl)anthracene (BPEA) microwire trunks and tris-(8-hydroxyquinoline)aluminium (Alq3) microstructure branches by an anti-solvent induced sequential crystallization strategy. During the epitaxial growth process, the hydrogen-bonding interactions of the anti-solvent and solvent cause a large change in the solubility and crystallization rate of BPEA and Alq3 molecules in the mixed system, which facilitates sequential crystallization of organic molecule pairs with similar nucleation thresholds and concentrations into desired heterostructures by manipulating the synergism of anti-solvents and solvents. The Förster resonant energy transfer process in heterostructures could be modulated by varying the structure of heterostructures, such as the shape, amount and angles of the branches. The present synthesis strategy provides a unique insight into the detailed formation mechanism of complex organic heterostructures, further guiding the construction of more functional heterostructure materials.
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Affiliation(s)
- Baipeng Yin
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
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Chandrasekar PV, Yang S, Hu J, Sulaman M, Shi Y, Saleem MI, Tang Y, Jiang Y, Zou B. Solution-phase, template-free synthesis of PbI 2 and MAPbI 3 nano/microtubes for high-sensitivity photodetectors. NANOSCALE 2019; 11:5188-5196. [PMID: 30855064 DOI: 10.1039/c9nr00452a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Organic-inorganic hybrid perovskite materials with exotic semiconducting properties have become inevitable candidates for next-generation electronic devices. Very recently, a low dimensional nanostructure of the perovskite materials has attracted the scientific community due to its enhanced performance in optoelectronics as compared to its bulk counterparts. Herein, a facile method was developed for the scalable, room-temperature synthesis of CH3NH3PbI3 (MAPbI3) nano/microtubes by direct conversion of lead iodide (PbI2) microtubes through a solution-phase method. At first, the PbI2 microtubes were synthesized by the anti-solvent crystallization process and subsequently converted to CH3NH3PbI3 nano/microtubes by the addition of CH3NH3I (MAI) precursor directly in the solution phase. The corresponding photodetectors (PDs) in the lateral metal-semiconductor-metal (MSM) configuration of the PbI2 microtubes and MAPbI3 nano/microtubes on glass substrates were investigated systematically. Compared to the PbI2 based PDs (557 mA W-1, 3.65 × 1012 Jones, 0.251 s/0.252 s), the MAPbI3 based PDs exhibit higher photoresponsivity, specific detectivity, and faster response time (25 A W-1, 9.9 × 1013 Jones, 49 ms/20 ms) under irradiation with 4.6 μW cm-2 intensity light of the 532 nm laser at a bias of 5 V. The proposed method is a low-temperature process, easy to apply in large scale synthesis, and finds potential applications in optoelectronic devices.
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Affiliation(s)
- Perumal Veeramalai Chandrasekar
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Center for Micro-Nanotechnology, School of Physics, Beijing Institute of Technology, Beijing 100081, P.R. China.
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