In situ transformation of Cu2O@MnO2 to Cu@Mn(OH)2 nanosheet-on-nanowire arrays for efficient hydrogen evolution
In situ transformation of Cu2O@MnO2 to Cu@Mn(OH)2 nanosheet-on-nanowire arrays for efficient hydrogen evolution
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Cu2O@MnO2 到 Cu@Mn(OH)2 纳米片纳米线阵列的原位转化可有效析氢
DOI：
10.1007/s12274-017-1798-6
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发表时间：
2018
期刊：
影响因子：
9.9
通讯作者：
Jin-Song Hu
中科院分区：
文献类型：
--
作者：
Li Chen;Xing Zhang;Wenjie Jiang;Yun Zhang;Linbo Huang;Yuyun Chen;Yuguo Yang;Li Li;Jin-Song Hu
开发新的非贵金属催化剂并了解其析氢反应（HER）活性的来源对于合理设计高活性低成本催化剂作为最先进的贵金属催化剂的替代品至关重要。本文通过在泡沫铜上制备包覆有Cu 2 O纳米线阵列的MnO 2纳米片（Cu2O@MnO2NW@NS），然后进行原位计时电位（CP）处理，证明了氧化锰/氢氧化物作为高活性的电催化剂用于HER。结果表明，经CP处理后，Cu_2O@MnO_2原位转化为Cu@Mn（OH）_2NW@NS，由于其本征活性的提高，使其对HER的催化活性大大提高。连同来自这种三维（3D）核-壳阵列的用于暴露更易接近的活性位点和有效的质量和电子转移的益处，所得的Cu@Mn（OH）2NW@NS在10 mA/cm 2下相对于RHE为132 mV的低过电位方面表现出优异的HER活性和突出的耐久性。总的来说，我们希望这些发现为探索其他锰基纳米材料作为有效的电催化剂提供新的机会，并使人们能够进一步了解其催化过程。
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 MnO2nanosheets coated with Cu2O nanowire arrays (Cu2O@MnO2NW@NS) on Cu foam followed by anin situchronopotentiometry (CP) treatment. It was discovered that thein situtransformation of Cu2O@MnO2into Cu@Mn(OH)2NW@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)2NW@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.