析氧
双功能
过电位
电催化剂
材料科学
催化作用
分解水
非阻塞I/O
化学工程
无机化学
氧化物
制氢
双功能催化剂
极化(电化学)
电化学
化学
冶金
电极
物理化学
光催化
工程类
生物化学
作者
Helmut Schäfer,Daniel M. Chevrier,Peng Zhang,Johannes Stangl,Klaus Müller‐Buschbaum,Jörg D. Hardege,K. Kuepper,J. Wollschläger,Ulrich Krupp,Simon Dühnen,Martin Steinhart,Lorenz Walder,Shamaila Sadaf,Mercedes Schmidt
标识
DOI:10.1002/adfm.201601581
摘要
Janus type Water-Splitting Catalysts have attracted highest attention as a tool of choice for solar to fuel conversion. AISI Ni 42 steel was upon harsh anodization converted in a bifunctional electrocatalyst. Oxygen evolution reaction- (OER) and hydrogen evolution reaction (HER) are highly efficiently and steadfast catalyzed at pH 7, 13, 14, 14.6 (OER) respectively at pH 0, 1, 13, 14, 14.6 (HER). The current density taken from long-term OER measurements in pH 7 buffer solution upon the electro activated steel at 491 mV overpotential was around 4 times higher (4 mA/cm2) in comparison with recently developed OER electrocatalysts. The very strong voltage-current behavior of the catalyst shown in OER polarization experiments at both pH 7 and at pH 13 were even superior to those known for IrO2-RuO2. No degradation of the catalyst was detected even when conditions close to standard industrial operations were applied to the catalyst. A stable Ni-, Fe- oxide based passivating layer sufficiently protected the bare metal for further oxidation. Quantitative charge to oxygen- (OER) and charge to hydrogen (HER) conversion was confirmed. High resolution XPS spectra showed that most likely gamma-NiO(OH) and FeO(OH) are the catalytic active OER and NiO is the catalytic active HER species.
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