期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201804361
关键词
bifunctional catalysts; electrocatalysis; hydrogen evolution reaction; oxygen evolution reaction; water splitting
类别
资金
- Australian Research Council [DP180102869]
- Science and Engineering Faculty
The development of active yet stable bifunctional materials to produce hydrogen and oxygen via electrochemical water splitting is an ongoing challenge. Here, a system based on electrodeposited Ni(OH)(2) and Co(OH)(2) containing highly distributed gold nanoparticles at less than 0.25 at% to facilitate the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under alkaline conditions is developed. The key aspect is using galvanic replacement to deposit gold on a layer of electrodeposited Co(OH)(2) prior to electrodepositing Ni(OH)(2). The fabrication of a composite system based on Co(OH)(2)-Au-Ni(OH)(2) is required for optimal activity for both the HER and OER. The composite is characterized with helium ion microscopy, transmission electron microscopy, depth profiling X-ray photoelectron microscopy, and a variety of electrochemical techniques. This material exceeds the activity of Pt for the HER at current densities greater than 40 mA cm(-2) and is stable for both reactions for prolonged periods of electrolysis. In a two-electrode configuration, current densities greater than 175 mA cm(-2) for overall water splitting could be readily achieved at an applied voltage of 1.90 V in a commercially relevant electrolyte of 6 m NaOH.
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