Boosting multi-hole water oxidation catalysis on hematite photoanodes under low bias

Wu, Lei; Tang, Daojian; Xue, Jianfeng; Wang, Shuobo; Ji, Hongwei; Chen, Chuncheng; Zhang, Yuchao; Zhao, Jincai

doi:10.1007/s11426-022-1527-9

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“…Charge‐transfer rate constants (k ct ), recombination rate constants (k rec ) and the charge‐transfer efficiency (η ct ) were extracted from the IMPS spectra [2,16] . Compared to WOR on BiVO 4 , the introduction of NH 3 increased the k ct from 0.718 to 5.61 s −1 , but there was little change in k rec , leading to the higher η ct (Figure 3c).…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Wu,

Li,

Dang

et al. 2023

Angewandte Chemie

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High‐efficient photoelectrocatalytic direct ammonia oxidation reaction (AOR) conducted on semiconductor photoanodes remains a substantial challenge. Herein, we develop a strategy of simply introducing ppm levels of Cu ions (0.5–10 mg/L) into NH3 solutions to significantly improve the AOR photocurrent of bare BiVO4 photoanodes from 3.4 to 6.3 mA cm−2 at 1.23 VRHE, being close to the theoretical maximum photocurrent of BiVO4 (7.5 mA cm−2). The surface charge‐separation efficiency has reached 90 % under a low bias of 0.8 VRHE. This AOR exhibits a high Faradaic efficiency (FE) of 93.8 % with the water oxidation reaction (WOR) being greatly suppressed. N2 is the main AOR product with FEs of 71.1 % in aqueous solutions and FEs of 100 % in non‐aqueous solutions. Through mechanistic studies, we find that the formation of Cu−NH3 complexes possesses preferential adsorption on BiVO4 surfaces and efficiently competes with WOR. Meanwhile, the cooperation of BiVO4 surface effect and Cu‐induced coordination effect activates N−H bonds and accelerates the first rate‐limiting proton‐coupled electron transfer for AOR. This simple strategy is further extended to other photoanodes and electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Wu,

Li,

Dang

et al. 2023

Angewandte Chemie

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Boosting multi-hole water oxidation catalysis on hematite photoanodes under low bias

Cited by 1 publication

References 40 publications

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

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Boosting multi-hole water oxidation catalysis on hematite photoanodes under low bias

Cited by 1 publication

References 40 publications

Highly Selective Ammonia Oxidation on BiVO4 Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Highly Selective Ammonia Oxidation on BiVO4 Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

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Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions