Tuning the Surface Wettability of a BiVO4Photoanode for Kinetically Modulating Water Oxidative H2O2Accumulation

Shipeng Wan; Chaoran Dong; Jie Jin; Jing Li; Qin Zhong; Kan Zhang; Jong Hyeok Park

doi:10.1021/acsenergylett.2c01078

Tuning the Surface Wettability of a BiVO₄Photoanode for Kinetically Modulating Water Oxidative H₂O₂Accumulation

Shipeng Wan, Chaoran Dong, Jie Jin, Jing Li, Qin Zhong, Kan Zhang, Jong Hyeok Park

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Photoelectrochemical water splitting into H₂and H₂O₂has received increasing attention but suffers from uncontrollable selectivity for water oxidative H₂O₂production and low solar conversion efficiency. Herein, we present a N₂-treated surface oxygen-vacancy-enriched BiVO₄photoanode (N-O_vac-BVO), which tunes the surface wettability of BVO toward a kinetics-controlled H₂O₂production process as well as offers higher charge separation efficiency. As a result, the average Faradaic efficiency (FE) reaches 73.8% from 0.6 to 1.9 V vs RHE with the best FE of 81.2%, up to 4 times higher than that of the BVO photoanode. The H₂O₂concentration can accumulate to 4.58 × 10^-4M at 1.6 V vs RHE in 2 h, and the corresponding production rate reaches 11.45 μmol·h^-1. This work reveals the importance of the photoanode surface microenvironment and provides effective guidance for photoanode design toward the regulation of competing reactions in an aqueous solution.

Original language	English
Pages (from-to)	3024-3031
Number of pages	8
Journal	ACS Energy Letters
Volume	7
Issue number	9
DOIs	https://doi.org/10.1021/acsenergylett.2c01078
Publication status	Published - 2022 Sept 9

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2022H1D3A3A01077254, 2019R1A4A1029237, 2019R1A2C3010479, 2021M3H4A1A03049662). K. Zhang acknowldges the support by NSFC (22172077), the Natural Science Foundation of Jiangsu Province of China (BK20220932, BK20211573), the Jiangsu International Science and Technology Cooperation Program (BZ2020063), and the Fundamental Research Funds for the Central Universities (30921011216). The authors thank Dr. Xiangyu Guo and Lili Xu, who participated in the discussions for analyzing the data obtained from the calculations.

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acsenergylett.2c01078

Cite this

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title = "Tuning the Surface Wettability of a BiVO4Photoanode for Kinetically Modulating Water Oxidative H2O2Accumulation",

abstract = "Photoelectrochemical water splitting into H2and H2O2has received increasing attention but suffers from uncontrollable selectivity for water oxidative H2O2production and low solar conversion efficiency. Herein, we present a N2-treated surface oxygen-vacancy-enriched BiVO4photoanode (N-Ovac-BVO), which tunes the surface wettability of BVO toward a kinetics-controlled H2O2production process as well as offers higher charge separation efficiency. As a result, the average Faradaic efficiency (FE) reaches 73.8% from 0.6 to 1.9 V vs RHE with the best FE of 81.2%, up to 4 times higher than that of the BVO photoanode. The H2O2concentration can accumulate to 4.58 × 10-4M at 1.6 V vs RHE in 2 h, and the corresponding production rate reaches 11.45 μmol·h-1. This work reveals the importance of the photoanode surface microenvironment and provides effective guidance for photoanode design toward the regulation of competing reactions in an aqueous solution.",

author = "Shipeng Wan and Chaoran Dong and Jie Jin and Jing Li and Qin Zhong and Kan Zhang and Park, {Jong Hyeok}",

note = "Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2022H1D3A3A01077254, 2019R1A4A1029237, 2019R1A2C3010479, 2021M3H4A1A03049662). K. Zhang acknowldges the support by NSFC (22172077), the Natural Science Foundation of Jiangsu Province of China (BK20220932, BK20211573), the Jiangsu International Science and Technology Cooperation Program (BZ2020063), and the Fundamental Research Funds for the Central Universities (30921011216). The authors thank Dr. Xiangyu Guo and Lili Xu, who participated in the discussions for analyzing the data obtained from the calculations. Publisher Copyright: {\textcopyright} 2022 American Chemical Society. All rights reserved.",

year = "2022",

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T1 - Tuning the Surface Wettability of a BiVO4Photoanode for Kinetically Modulating Water Oxidative H2O2Accumulation

AU - Wan, Shipeng

AU - Dong, Chaoran

AU - Jin, Jie

AU - Li, Jing

AU - Zhong, Qin

AU - Zhang, Kan

AU - Park, Jong Hyeok

N1 - Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2022H1D3A3A01077254, 2019R1A4A1029237, 2019R1A2C3010479, 2021M3H4A1A03049662). K. Zhang acknowldges the support by NSFC (22172077), the Natural Science Foundation of Jiangsu Province of China (BK20220932, BK20211573), the Jiangsu International Science and Technology Cooperation Program (BZ2020063), and the Fundamental Research Funds for the Central Universities (30921011216). The authors thank Dr. Xiangyu Guo and Lili Xu, who participated in the discussions for analyzing the data obtained from the calculations. Publisher Copyright: © 2022 American Chemical Society. All rights reserved.

PY - 2022/9/9

Y1 - 2022/9/9

N2 - Photoelectrochemical water splitting into H2and H2O2has received increasing attention but suffers from uncontrollable selectivity for water oxidative H2O2production and low solar conversion efficiency. Herein, we present a N2-treated surface oxygen-vacancy-enriched BiVO4photoanode (N-Ovac-BVO), which tunes the surface wettability of BVO toward a kinetics-controlled H2O2production process as well as offers higher charge separation efficiency. As a result, the average Faradaic efficiency (FE) reaches 73.8% from 0.6 to 1.9 V vs RHE with the best FE of 81.2%, up to 4 times higher than that of the BVO photoanode. The H2O2concentration can accumulate to 4.58 × 10-4M at 1.6 V vs RHE in 2 h, and the corresponding production rate reaches 11.45 μmol·h-1. This work reveals the importance of the photoanode surface microenvironment and provides effective guidance for photoanode design toward the regulation of competing reactions in an aqueous solution.

AB - Photoelectrochemical water splitting into H2and H2O2has received increasing attention but suffers from uncontrollable selectivity for water oxidative H2O2production and low solar conversion efficiency. Herein, we present a N2-treated surface oxygen-vacancy-enriched BiVO4photoanode (N-Ovac-BVO), which tunes the surface wettability of BVO toward a kinetics-controlled H2O2production process as well as offers higher charge separation efficiency. As a result, the average Faradaic efficiency (FE) reaches 73.8% from 0.6 to 1.9 V vs RHE with the best FE of 81.2%, up to 4 times higher than that of the BVO photoanode. The H2O2concentration can accumulate to 4.58 × 10-4M at 1.6 V vs RHE in 2 h, and the corresponding production rate reaches 11.45 μmol·h-1. This work reveals the importance of the photoanode surface microenvironment and provides effective guidance for photoanode design toward the regulation of competing reactions in an aqueous solution.

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