Citation: Jingwei Huang, Zhanghao Yang, Xiaoli Yuan, Lei Wang, Houde She, Qizhao Wang. Enhancing the separation and transport efficiency of carriers in BiVO₄ composite photoanode through the utilization of BNQDs as hole extractors[J]. Chinese Chemical Letters, ;2025, 36(12): 111062. doi: 10.1016/j.cclet.2025.111062 shu

Enhancing the separation and transport efficiency of carriers in BiVO₄ composite photoanode through the utilization of BNQDs as hole extractors

Jingwei Huang ^a ,
Zhanghao Yang ^a ,
Xiaoli Yuan ^a ,
Lei Wang ^a ,
Houde She ^a ,
Qizhao Wang ^{a, b, *,}

a.
College of Chemistry and Chemical Engineering, Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials, Northwest Normal University, Lanzhou 730070, China
b.
School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China

wangqizhao@163.com

qizhaosjtu@gmail.com

Received Date: 13 October 2024
Revised Date: 19 January 2025
Accepted Date: 10 March 2025
Available Online: 10 March 2025

Figures(7)

It is hard to achieve efficient photoelectrochemical (PEC) water splitting with BiVO₄ due to the severe electron/hole recombination and slow carrier migration. In this work, BiVO₄/BNQDs/CoBi photoanode was rationally designed and prepared for efficient PEC water splitting, utilizing boron nitride quantum dots (BNQDs) as hole extractors and cobalt borate (CoBi) as a cocatalyst. The BiVO₄/BNQDs/CoBi exhibits an excellent photocurrent density of 5.1 mA/cm² at 1.23 V vs. RHE, which is 3.4 times that of the pure BiVO₄. Systematic studies show that BNQDs and CoBi can simultaneously promote charge separation and migration, with a charge injection and separation efficiency of 82% and 93% at 1.23 V vs. RHE, respectively. The enhanced dynamic behavior at the BiVO₄/BNQDs/CoBi interface was systematically and quantitatively evaluated by intensity modulated photocurrent spectroscopy (IMPS) and transient surface photovoltage (TPV) spectroscopy. It is found that BNQDs and CoBi play a similar role for inhibiting charge recombination while BNQDs play significant role for improving the charge transfer rate than CoBi.
- Hole extractor,
- PEC water oxidation,
- BiVO₄,
- Boron nitrogen quantum dots,
- Cobalt borate,
- Interfacial charge regulation
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Enhancing the separation and transport efficiency of carriers in BiVO4 composite photoanode through the utilization of BNQDs as hole extractors

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通讯作者: 陈斌, bchen63@163.com

Enhancing the separation and transport efficiency of carriers in BiVO₄ composite photoanode through the utilization of BNQDs as hole extractors