Trapping of Intermediates of a Photocatalytic Oxygen Evolution Reaction in Overall Water Splitting

被引：5
|
作者：
Amano, Fumiaki [2 ]
Nakayama, Satoshi [1 ]
Suzuki, Souta [2 ]
Yamakata, Akira [3 ]
Beppu, Kosuke [2 ]
机构：
[1] Univ Kitakyushu, Grad Sch Environm Engn, Dept Chem & Environm Engn, Fukuoka 8080135, Japan
[2] Tokyo Metropolitan Univ, Grad Sch Urban Environm Sci, Dept Appl Chem Environm, Tokyo 1920397, Japan
[3] Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
来源：
ACS APPLIED ENERGY MATERIALS | 2024年 / 7卷 / 04期
基金：
日本学术振兴会;
关键词：
electron-spin resonance; surface cocatalyst; hydroxyl radical; peroxylradical; water oxidation; ELECTRON-SPIN-RESONANCE; NATAO3; PHOTOCATALYSTS; DOPED NATAO3; OXIDATION; O-2; H-2; ZN; (GA1-XZNX)(N1-XOX); ABSORPTION; TRAPS;
D O I：
10.1021/acsaem.3c03172
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Intermediates in the overall water splitting on particulate photocatalysts were investigated by electron paramagnetic resonance (EPR) measurements using 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as a spin trap. In situ EPR spectra under ultraviolet light showed the exclusive formation of a hydroxyl radical adduct ((DMPO)-D-center dot-OH) over Ga2O3 and NaTaO3:La without a Rh-Cr oxide cocatalyst. In contrast, the Rh-Cr oxide cocatalyst-loaded photocatalysts active for water splitting formed a 5,5-dimethyl-2-oxo-pyrroline-1-oxyl radical ((DMPOX)-D-center dot). (DMPOX)-D-center dot is suggested as an indicator of the surface peroxyl radical intermediate (M-OO center dot) in the oxygen evolution reaction pathway.
引用
收藏
页码：1398 / 1402
页数：5
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