电催化剂
化学工程
氢
塔菲尔方程
电化学
氢气储存
分解水
纳米技术
电解质
作者
Xiangye Liu,Chenlong Dong,Wujie Dong,Xin Wang,Xiaotao Yuan,Fuqiang Huang
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2016-04-18
卷期号:6 (45): 38515-38520
被引量:15
摘要
Earth-abundant and highly efficient electrocatalysts for the hydrogen evolution reaction (HER) are desired for hydrogen production from water-splitting. Here, Co nanoparticles were embedded in the 3D CoO matrix via a template-free method, including cobalt hydroxy-carbonate nanowire arrays grown on Ni foam and the following non-contact Al-reduction process. The as-prepared 3D hierarchical structured Co/CoO nanowires possess good charge transfer and mass transport properties, and a synergistic effect at the Co/CoO interface can hugely facilitate the HER kinetics. A suitable balance between Co and CoO in the catalyst is crucial for high catalytic activity. And the optimal Co/CoO array exhibited outstanding HER activities in 1 M NaOH, achieving nearly zero onset potential, and a current density of 100 mA cm−2 with a small overpotential of 167 mV. They also showed good long-term stabilities. This hybrid Co/CoO nanowire array is a promising material for large-scale hydrogen production from water-splitting.
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