过电位
纳米片
催化作用
纳米线
纳米材料
材料科学
锰
氢氧化物
氧化物
化学工程
金属
原位
纳米技术
析氧
无机化学
化学
电极
电化学
冶金
物理化学
有机化学
工程类
生物化学
作者
Li Chen,Xing Zhang,Wenjie Jiang,Yun Zhang,Jin‐Song Hu,Yuyun Chen,Yang Yang,Li Li,Jin‐Song Hu
出处
期刊:Nano Research
[Springer Nature]
日期:2018-03-19
卷期号:11 (4): 1798-1809
被引量:37
标识
DOI:10.1007/s12274-017-1798-6
摘要
The development of new non-precious metal catalysts and understanding the origin of their activity for the hydrogen evolution reaction (HER) are essential for rationally designing highly active low-cost catalysts as alternatives to state-of-the-art precious metal catalysts. Herein, manganese oxide/hydroxide was demonstrated as a highly active electrocatalysts for the HER by fabricating MnO2 nanosheets coated with Cu2O nanowire arrays (Cu2O@MnO2 NW@NS) on Cu foam followed by an in situ chronopotentiometry (CP) treatment. It was discovered that the in situ transformation of Cu2O@MnO2 into Cu@Mn(OH)2 NW@NS by the CP treatment drastically boosted the catalytic activity for the HER due to an enhancement of its intrinsic activity. Together with the benefits from such three-dimensional (3D) core–shell arrays for exposing more accessible active sites and efficient mass and electron transfers, the resulting Cu@Mn(OH)2 NW@NS exhibited excellent HER activity and outstanding durability in terms of a low overpotential of 132 mV vs. RHE at 10 mA/cm2. Overall, we expect these findings to generate new opportunities for the exploration of other Mn-based nanomaterials as efficient electrocatalysts and enable further understanding of their catalytic processes.
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