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In situ transformation of Cu2O@MnO2 to Cu@Mn(OH)2 nanosheet-on-nanowire arrays for efficient hydrogen evolution

机译:将Cu2O @ MnO2原位转化为纳米线上的Cu @ Mn(OH)2纳米片阵列以有效释放氢

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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.
机译:新型非贵金属催化剂的开发以及了解其对于氢释放反应(HER)的活性的来源对于合理设计高活性低成本催化剂作为最新贵金属催化剂的替代品至关重要。 ,氧化锰/氢氧化锰被证明是HER的高活性电催化剂,其方法是在泡沫铜上制备覆有Cu2O纳米线阵列(Cu2O @ MnO2 NW @ NS)的MnO2纳米片,然后进行原位计时电位(CP)处理。通过CP处理将Cu2O @ MnO2原位转化为Cu @ Mn(OH)2 NW @ NS由于其固有活性的增强而大大提高了HER的催化活性。 3D)核-壳阵列,用于暴露更多可及的活性位点以及有效的质量和电子转移,所得Cu @ Mn(OH)2 NW @ NS表现出优异的HER活性和出色的耐久性在10 mA / cm2的条件下,相对于RHE的过电势为132 mV。总体而言,我们希望这些发现将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,并使人们进一步了解其催化过程。

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  • 来源
    《纳米研究(英文版)》 |2018年第4期|1798-1809|共12页
  • 作者单位

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    School of Science, Beijing Jiaotong University, Beijing 100044, China;

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    School of Science, Beijing Jiaotong University, Beijing 100044, China;

    School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;

    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-19 03:47:26
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