Point-defect engineering of nanoporous CuBi2O4 photocathode via rapid thermal processing for enhanced photoelectrochemical activity

Li, Qu; Tan, Runfa; Sivanantham, Arumugam; Kang, Min Je; Jeong, Yoo Jae; Seo, Dong Hyun; Kim, Sungkyu; Cho, In Sun

doi:10.1016/j.jechem.2022.03.013

Cited by 30 publications

(13 citation statements)

References 39 publications

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“…For instance, rapid thermal treatment of the nanoporous CuBi 2 O 4 photocathode (np-CBO) under an O 2 , N 2 and vacuum atmosphere successfully generated surface O vacancies. 174 O vacancies promote the charge transport performance of the photoelectrode, and the sequential photoelectrode in an O 2 -N 2 -O 2 -N 2 atmosphere can realize the cyclic generation of surface point defects to control the defect density (Fig. 13a).…”

Section: Defect States Facilitate Carrier Separation and Transportmentioning

confidence: 99%

Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting

Wang

Liu

et al. 2023

Chem. Commun.

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Section: Defect States Facilitate Carrier Separation and Transportmentioning

confidence: 99%

Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting

Wang

Liu

et al. 2023

Chem. Commun.

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“…[ 36 ] Anion vacancies often act as electron donors to increase the charge carrier density and conductivity of the photoanode. [ 34 ] In contrast, cation vacancies often act as electron acceptors to generate holes, which can increase the receptor density and improve the photocurrent of the p‐type photoanode. [ 37 ] From the perspective of defect engineering, the charge separation, transfer, and transport properties of the photoanode (especially the photocathode) can be improved by adjusting point defects, which play a crucial role in enhancing the PEC performance.…”

Section: Fundamentals Of Defects and Photocathodementioning

confidence: 99%

“…Qu et al. [ 34 ] synthesized nano‐porous CuBi 2 O 4 photoelectrodes and designed their surface point defects through rapid thermal treatment in controlled atmospheres (O 2 , N 2 , and vacuum). Lee et al.…”

Section: Fundamentals Of Defects and Photocathodementioning

confidence: 99%

Defective Photocathode: Fundamentals, Construction, and Catalytic Energy Conversion

Huang

2023

Adv Funct Materials

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The development of a long‐term and sustainable energy economy is one of the most significant technological challenges facing humanity. Photoelectrochemical (PEC) technology is considered as the most attractive route for converting solar energy into chemical energy. However, the slow reaction kinetics of PEC oxidation and reduction greatly hinder its practical application. To address this issue, engineering photoelectrodes with various defects can significantly improve their catalytic performance, which can not only regulate catalyst electronic structure but also promote charge transfer/separation by serving as an active/adsorption/energy storage site. Herein, the defect engineering strategies for photoelectrodes are systematically summarized, focusing on the latest progress in defective photocathode for energy conversion. First, an overview of defect types, basic principles of photocathode, and the positive role of defects in the photocathode are provided. Second, the construction strategies and characterization methods of defective photocathode are summarized. Then, the progress of typical energy conversion applications, including hydrogen production, CO2 reduction, and nitrogen reduction over defective photocathode, is reviewed, highlighting the crucial role of defects in high catalytic performance. Finally, the challenges and future prospects of defective photocathode are discussed, aiming to bring new opportunities for the development of photocathode through defect engineering.

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“…The obtained spectra of prepared photoelectrodes were performed in a similar way as previous TRPL studies on semiconductor-based nanomaterials that fit spectra using bi-exponential functions of nonradiative or fast (𝜏1) and radiative or slow (𝜏2) lifetime components. [26,[52][53][54] In Figure S13 (Supporting Information), a straight line indicates a good fit based on weighted residuals. In Table 1, all samples exhibit comparable values of 𝜏1 (0.62-0.41 ns).…”

Section: Optical Properties and Bandgap Calculationsmentioning

confidence: 99%

High‐Performance Silver‐Doped Porous CuBi₂O₄ Photocathode Integrated with NiO Hole‐Selective Layer for Improved Photoelectrochemical Water Splitting

Gopannagari,

Reddy,

Inae

et al. 2023

Advanced Sustainable Systems

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CuBi2O4(CBO) has received considerable attention owing to its ideal optical bandgap and positive photocurrent onset potential. However, CBO photocathodes exhibit poor charge carrier separation and transfer across the conducting substrate interface. Herein, a systematic incorporation of Ag+‐cations into nanosized porous CBO network (ACBO) using a simple pulsed‐electrodeposition method. In ACBO photocathode, the Ag+‐ions replace the Bi3+‐ions, thereby building an increased hole concentration, which further signifies the photogenerated electron‐hole separation. Additionally, introducing a low‐cost NiO hole‐selective layer between ACBO and the conducting substrate enables a back‐interface‐aided hole‐extraction and electron blocking, resulting in an improved charge transfer across the back interface. Compared with an unmodified CBO, the NiO/ACBO photocathode exhibits a three‐fold enhanced photocurrent performance. This enhances the photocurrent originating from the incorporation of a substantial amount of Ag+‐ions into the CBO structure, leading to an increased acceptor density as well as the formation of an appropriate hole‐selective layer across the back‐contact. The absorption percentage, time‐resolved photoluminescence, and photoelectrochemical impedance spectroscopy measurements unveil the potential light harvesting, charge separation, and transfer characteristics of the NACBO photoelectrode, respectively. Through this systematic study, an efficient and simple strategy is determined for developing ternary metal oxide‐based photocathode/photoanode systems for sustainable energy applications.

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Point-defect engineering of nanoporous CuBi2O4 photocathode via rapid thermal processing for enhanced photoelectrochemical activity

Cited by 30 publications

References 39 publications

Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting

Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting

Defective Photocathode: Fundamentals, Construction, and Catalytic Energy Conversion

High‐Performance Silver‐Doped Porous CuBi₂O₄ Photocathode Integrated with NiO Hole‐Selective Layer for Improved Photoelectrochemical Water Splitting

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Point-defect engineering of nanoporous CuBi2O4 photocathode via rapid thermal processing for enhanced photoelectrochemical activity

Cited by 30 publications

References 39 publications

Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting

Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting

Defective Photocathode: Fundamentals, Construction, and Catalytic Energy Conversion

High‐Performance Silver‐Doped Porous CuBi2O4 Photocathode Integrated with NiO Hole‐Selective Layer for Improved Photoelectrochemical Water Splitting

Contact Info

Product

Resources

About

High‐Performance Silver‐Doped Porous CuBi₂O₄ Photocathode Integrated with NiO Hole‐Selective Layer for Improved Photoelectrochemical Water Splitting