过电位
阳极
析氧
材料科学
分解水
碱性水电解
阴极
电极
纳米技术
箔法
镍
纳米管
化学工程
电流密度
电解
冶金
化学
催化作用
复合材料
碳纳米管
电化学
电解质
物理化学
光催化
工程类
物理
生物化学
量子力学
作者
Xue Tian,Jianying Wang,Lvlv Ji,Weiqiang Tang,Zuofeng Chen
标识
DOI:10.1021/acssuschemeng.7b03499
摘要
The development of high-performance nonprecious electrocatalysts for overall water splitting has attracted increasing attention but remains a vital challenge. Herein, we report a ZnO-based template method to fabricate Ni nanotube arrays (NTAs) anchored on nickel foil for applications in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). On the basis of this precursor electrode, the three-dimensional NiSe2 NTAs of unique sandwich-like coaxial structure have been fabricated by electrodeposition of NiSe2 on Ni NTAs, which exhibits high performance toward the HER in both acidic and alkaline media. The method based on Ni NTAs can be readily extended to fabricate Ni2P NTAs by gas–solid phosphorization for the HER, and NiFeOx NTAs by anodic codeposition of Ni and Fe for the OER. Consequently, an alkaline electrolyzer has been constructed using NiFeOx NTAs and NiSe2 NTAs as anode and cathode, respectively, which can realize overall water splitting with a current density of 100 mA cm–2 at an overpotential of 510 mV.
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