Highly activated phosphate-derived oxyhydroxide overlayer for enhancing photoelectrochemical ammonia oxidation-boosted hydrogen evolution

被引：0

作者：

Pham, Phuong Thi ^{[1
]}

Kim, Jong Hun ^{[1
]}

Hong, Won Tae ^{[1
]}

Han, Hyungu ^{[1
]}

Roh, Seung Hun ^{[1
]}

Yu, Xu ^{[3
]}

Chae, Heeyeop ^{[1
,2
]}

Park, Jongwook ^{[4
]}

Kim, Min-Cheol ^{[5
]}

Choi, Chang Hyuck ^{[6
,7
]}

Kim, Jung Kyu ^{[1
,2
]}

机构：

[1] Sungkyunkwan Univ SKKU, Sch Chem Engn, Suwon 16419, South Korea

[2] Sungkyunkwan Univ SKKU, SKKU Adv Inst Nanotechnol, Suwon 16419, South Korea

[3] Yangzhou Univ, Sch Chem & Chem Engn, Yangzhou 225002, Peoples R China

[4] Kyung Hee Univ, Dept Chem Engn, Integrated Engn, Yongin 17104, Gyeonggi, South Korea

[5] Sookmyung Womens Univ, Dept Chem, Seoul 04310, South Korea

[6] Pohang Univ Sci & Technol POSTECH, Dept Chem, Pohang 37673, South Korea

[7] Yonsei Univ, Inst Convergence Res & Educ Adv Technol I CREATE, Seoul 03722, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2025年 / 506卷

基金：

新加坡国家研究基金会;

关键词：

PEC ammonia oxidation reaction; Activated phosphate overlayer; BiVO; 4; Hydrogen production; Ammonia to hydrogen conversion; THIN-FILM; PERFORMANCE; WATER; BIVO4;

D O I：

10.1016/j.cej.2025.160053

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Ammonia (NH3) oxidation reaction (AOR) has received great interest in recent years as an effective method to enable highly sustainable hydrogen (H2) storage and conversion. Here, we demonstrate an intensively enhanced photoelectrochemical (PEC) AOR-boosted H2 production with a highly activated bismuth-vanadium oxyhydroxide overlayer, derived from an overlaid thin phosphate layer, on BiVO4 (BVO) photoanode. A simple electrochemical (EC) activation is applied on a phosphate-modified bismuth vanadate (Pi-BVO) film to achieve the bimetallic oxyhydroxide overlayer on BVO (a-Pi-BVO) photoanode, which provides a high activity for enhancing the AOR kinetics. We confirm that the a-Pi-BVO photoanode follows pseudo-first order kinetics and demonstrates a 10-fold increase in PEC AOR kinetics, compared to pristine BVO at 0.77 V vs. reversible hydrogen electrode (RHE) in a dilute (500 ppm) NH3 aqueous media. In our solar-assisted overall ammonia electrolysis cell system with 2-electrode configuration, composed of PEC ammonia oxidation and EC hydrogen evolution reactions, a-Pi-BVO photoanode shows a 6.5-fold enhancement in H2 production compared to pristine BVO photoanode. This study demonstrates that the simple surface activation of the Pi-BVO photoanode enables highly active PEC AOR for efficient H2 production under dilute ammonia conditions, which is a promising strategy with applicability to practical wastewater applications.

引用

页数：11