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Masoumi Z, Tayebi M, Lari SAM, Seo B, Lim CS, Kim HG, Kyung D, Tayebi M. Photoelectrochemical Performance of a CuBi2O4 Photocathode with H2O2 as a Scavenger. INORGANICS 2023. [DOI: 10.3390/inorganics11040147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
Photoelectrochemical (PEC) water splitting is an eco-friendly method for producing clean and sustainable hydrogen fuels. Compared with the fabrication of solar hydrogen using n-type metal oxide semiconductor photoanodes, that of solar hydrogen using p-type metal oxide semiconductor photocathodes has not been researched as thoroughly. Therefore, this study investigated the effect of drop casting time on the PEC performance of a prepared CuBi2O4 photocathode. XPS, HRTEM, UV-DRS, Raman spectroscopy, XRD, and SEM analyses were used to characterize the prepared CuBi2O4 photocathode. Owing to the high charge separation and transfer, the photocurrent density of the CuBi2O4 photocathode was ~0.6 mA cm−2 at 0.3 V vs. RHE. The nanoporous CuBi2O4 photocathode exhibited a high photocurrent density of up to 1.2 mA cm−2 at 0.3 V vs. RHE with H2O2 as a sacrificial agent. Mott–Schottky and impedance measurements were also performed on the CuBi2O4 photocathode to estimate its acceptor density and charge-transfer resistance.
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Shao PW, Siao YS, Lai YH, Hsieh PY, Tsao CW, Lu YJ, Chen YC, Hsu YJ, Chu YH. Flexible BiVO 4/WO 3/ITO/Muscovite Heterostructure for Visible-Light Photoelectrochemical Photoelectrode. ACS APPLIED MATERIALS & INTERFACES 2021; 13:21186-21193. [PMID: 33905241 DOI: 10.1021/acsami.1c00671] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Flexible electronics has recently captured extensive attention due to its intriguing functionalities and great potential for influencing our daily life. In addition, with the increasing demand for green energy, photoelectrochemical (PEC) water splitting is a clean process that directly converts solar energy to chemical energy in the form of hydrogen. Thus the development of flexible green energy electronics represents a new domain in the research field of energy harvesting. In this work, we demonstrate the BiVO4 (BVO)/WO3/ITO/muscovite heterostructure photoelectrode for water splitting with flexible characteristics. The performance of BVO was modified by specific crystal facets, and the BVO/WO3 bilayer exhibited superior performance of 33% enhanced PEC activity at 1 V vs Ag/AgCl compared with pure BVO due to the proper staggered band alignment. Moreover, excellent mechanical stability was verified by a series of bending modes. This study demonstrates a pathway to a flexible photoelectrode for developing innovative devices for solar fuel generation.
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Affiliation(s)
- Pao-Wen Shao
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Yi-Syuan Siao
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Yu-Hong Lai
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Ping-Yen Hsieh
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Chun-Wen Tsao
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Yu-Jung Lu
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Yi-Chun Chen
- Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
| | - Yung-Jung Hsu
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - Ying-Hao Chu
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
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Abstract
AbstractIn this study, copper bismuth oxide (CuBi2O4) absorber-based thin film heterojunction solar cell structure consisting of Al/FTO/CdS/CuBi2O4/Ni has been proposed. The proposed solar cell device structure has been modeled and analyzed by using the solar cell capacitance simulator in one dimension (SCAPS-1D) software program. The performance of the proposed photovoltaic device is evaluated numerically by varying thickness, doping concentrations, defect density, operating temperature, back metal contact work function, series and shunt resistances. The current density–voltage behaviors at dark and under illumination are investigated. To realize the high efficiency CuBi2O4-based solar cell, the thickness, acceptor and donor densities, defect densities of different layers have been optimized. The present work reveals that the power conversion efficiency can be enhanced by increasing the absorber layer thickness. The efficiency of 26.0% with open-circuit voltage of 0.97 V, short-circuit current density of 31.61 mA/cm2, and fill-factor of 84.58% is achieved for the proposed solar cell at the optimum 2.0-μm-thick CuBi2O4 absorber layer. It is suggested that the p-type CuBi2O4 material proposed in the present study can be employed as a promising absorber layer for applications in the low cost and high efficiency thin-film solar cells.
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Lee J, Yoon H, Choi KS, Kim S, Seo S, Song J, Choi BU, Ryu J, Ryu S, Oh J, Jeon C, Lee S. Template Engineering of CuBi 2 O 4 Single-Crystal Thin Film Photocathodes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002429. [PMID: 32686276 DOI: 10.1002/smll.202002429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 06/07/2020] [Indexed: 06/11/2023]
Abstract
To develop strategies for efficient photo-electrochemical water-splitting, it is important to understand the fundamental properties of oxide photoelectrodes by synthesizing and investigating their single-crystal thin films. However, it is challenging to synthesize high-quality single-crystal thin films from copper-based oxide photoelectrodes due to the occurrence of significant defects such as copper or oxygen vacancies and grains. Here, the CuBi2 O4 (CBO) single-crystal thin film photocathode is achieved using a NiO template layer grown on single-crystal SrTiO3 (STO) (001) substrate via pulsed laser deposition. The NiO template layer plays a role as a buffer layer of large lattice mismatch between CBO and STO (001) substrate through domain-matching epitaxy, and forms a type-II band alignment with CBO, which prohibits the transfer of photogenerated electrons toward bottom electrode. The photocurrent densities of the CBO single-crystal thin film photocathode demonstrate -0.4 and -0.7 mA cm-2 at even 0 VRHE with no severe dark current under illumination in a 0.1 m potassium phosphate buffer solution without and with H2 O2 as an electron scavenger, respectively. The successful synthesis of high-quality CBO single-crystal thin film would be a cornerstone for the in-depth understanding of the fundamental properties of CBO toward efficient photo-electrochemical water-splitting.
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Affiliation(s)
- Jongmin Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Hongji Yoon
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Kyoung Soon Choi
- National Research Facilities and Equipment Center, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Seungkyu Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Sehun Seo
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Jaesun Song
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Byeong-Uk Choi
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Jiseung Ryu
- Analysis Technical Center, Korea Institute of Ceramic Engineering and Technology, Jinju, Gyeongsangnam-do, 52851, Republic of Korea
| | - Sangwoo Ryu
- Department of Advanced Materials Engineering, Kyonggi University, Suwon, Gyeonggi-do, 16227, Republic of Korea
| | - Jihun Oh
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34113, Republic of Korea
- Graduate School of Energy, Environment Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Cheolho Jeon
- The Advanced Nano Surface Research Group, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Sanghan Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
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Jung HJ, Lim Y, Choi BU, Bae HB, Jung W, Ryu S, Oh J, Chung SY. Direct Identification of Antisite Cation Intermixing and Correlation with Electronic Conduction in CuBi 2O 4 for Photocathodes. ACS APPLIED MATERIALS & INTERFACES 2020; 12:43720-43727. [PMID: 32877165 DOI: 10.1021/acsami.0c12491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Cu-based p-type semiconducting oxides have been sought for water-reduction photocathodes to enhance the energy-conversion efficiency in photoelectrochemical cells. CuBi2O4 has recently attracted notable attention as a new family of p-type oxides, based on its adequate band gap. Although the identification of a major defect structure should be the first step toward understanding the electronic conduction behavior, no direct experimental analysis has been carried out yet. Using atomic-scale scanning transmission electron microscopy together with chemical probing, we identify a substantial amount of BiCu-CuBi antisite intermixing as a major point-defect type. Our density functional theory calculations also show that antisite BiCu can seriously hinder the hole-polaron hopping between Cu, in agreement with lower conductivity and a larger thermal activation barrier under a higher degree of intermixing. These findings highlight the value of the direct identification of point defects for a better understanding of electronic properties in complex oxides.
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Affiliation(s)
- Hyun Joon Jung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
- Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Younghwan Lim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Byeong-Uk Choi
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Hyung Bin Bae
- KAIST Analysis Center, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - WooChul Jung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Sangwoo Ryu
- Department of Advanced Materials Engineering, Kyonggi University, Suwon, Gyeonggi-do16227, Korea
| | - Jihun Oh
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Sung-Yoon Chung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
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Lee J, Yoon H, Kim S, Seo S, Song J, Choi BU, Choi SY, Park H, Ryu S, Oh J, Lee S. Long-term stabilized high-density CuBi 2O 4/NiO heterostructure thin film photocathode grown by pulsed laser deposition. Chem Commun (Camb) 2019; 55:12447-12450. [PMID: 31528870 DOI: 10.1039/c9cc06092h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Harvesting sustainable hydrogen through water-splitting requires a durable photoelectrode to achieve high efficiency and long lifetime. Dense, uniform CuBi2O4/NiO thin film photocathodes grown by pulsed laser deposition achieved photocurrent density over 1.5 mA cm-2 at 0.4 VRHE and long-term chronoamperometric stability for over 8 hours.
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Affiliation(s)
- Jongmin Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
| | - Hongji Yoon
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
| | - Seungkyu Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
| | - Sehun Seo
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
| | - Jaesun Song
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
| | - Byeong-Uk Choi
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34113, Republic of Korea
| | - Seung Yo Choi
- School of Energy Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hyunwoong Park
- School of Energy Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sangwoo Ryu
- Department of Advanced Materials Engineering, Kyonggi University, Suwon, Gyeonggi-do 16227, Republic of Korea
| | - Jihun Oh
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34113, Republic of Korea and Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Sanghan Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.
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