期刊
CHEMSUSCHEM
卷 12, 期 9, 页码 1925-1930出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201802178
关键词
gas phase water splitting; photoelectrocatalysis; polymer electrolyte; solar hydrogen production; nanotubes
资金
- JST, Precursory Research for Embryonic Science and Technology (PRESTO) [JPMJPR15S1, JPMJPR18T1]
Photoelectrochemical (PEC) water vapor splitting by using n-type semiconductor electrodes with a proton exchange membrane (PEM) enabled pure hydrogen production from humidity in ambient air. We proved a design concept that the gas-electrolyte-semiconductor triple-phase boundary on a nanostructured photoanode is important for the photoinduced gas-phase reaction. A surface coating of solid-polymer electrolyte on a macroporous titania-nanotube array (TNTA) electrode markedly enhanced the incident photon-to-current conversion efficiency (IPCE) at the gas-solid interface. This indicates that proton-coupled electron transfer is the rate-determining step on the bare TNTA electrode for the gas-phase PEC reaction. The perfluorosulfonate ionomer-coated TNTA photoanode exhibited an IPCE of 26% at an applied voltage of 1.2V under 365nm ultraviolet irradiation. The hydrogen production rate in a large PEM-PEC cell (16cm(2)) was 10molmin(-1).
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