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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Nickel-selenide templated binary metal-organic frameworks for efficient water oxidation
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Nickel-selenide templated binary metal-organic frameworks for efficient water oxidation

机译：镍硒化物模板化二元金属 - 有机框架，用于高效水氧化

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摘要

The development of highly active and stable non-precious metal electrocatalysts is of great significance for energy conversion with the oxygen evolution reaction (OER) being a rate-determining step. Herein, we report a hybrid material bearing a three-dimensional (3D) core-shell hierarchical structure, in which binary metal-organic framework nanosheets (NiFe-MOF NSs) are rationally decorated on NiSe(x)nanosheet (NS) arrays supported on Ni foam (NF). With this approach, the highly conductive NiSe(x)NSs ensure rapid charge transfer, the NiFe-MOF NSs provide a large number of exposed active sites, and the 3D hierarchical structure benefits gas release and electrolyte diffusion. As a result the NiFe-MOF/NiSex/NF electrode delivers current densities of 10 and 100 mA cm(-2)at overpotentials of 198 and 230 mV and reveals a low Tafel slope of 30.6 mV dec(-1)toward the OER. When NiFe-MOF/NiSex/NF was used as both the anode and cathode for overall water splitting, the potential to deliver a current density of 10 mA cm(-2)was 1.59 V, lower than that for the benchmark IrO2/NF(+)||Pt/C/NF(-) system (1.66 V at 10 mA cm(-2)).
机译：高活性和稳定的非贵金属电催化剂的发展对于能量转化具有重要意义，具有氧气进化反应（OER）是速率确定步骤。在此，我们报告了一种承载三维（3D）核心壳分层结构的混合材料，其中二元金属 - 有机框架纳米片（NIFE-MOF NSS）在NISE（x）纳米片（ns）阵列上是合理的装饰ni泡沫（nf）。通过这种方法，高导电NISE（x）NSS确保快速电荷转移，NiFe-Mof NSS提供大量暴露的有源位点，3D层次结构有利于气体释放和电解质扩散。结果，NiFe-Mof / NiSex / NF电极在198和230mV的过电势下提供10和100 mA cm（-2）的电流密度，并展示朝向伊尔的30.6mV Dec（-1）的低Tafel斜率。当使用NiFe-Mof / NiSex / NF作为整体水分裂的阳极和阴极时，输送电流密度为10 mAcm（-2）的电位为1.59 V，低于基准IRO2 / NF（ +）|| Pt / C / NF（ - ）系统（1.66 V 10 mA cm（-2））。

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    Xu Suxian; Du Jian; Li Jiayuan; Sun Licheng; Li Fei;

  • 作者单位

    Dalian Univ Technol DUT KTH Joint Educ &

    Res Ctr Mol Devices State Key Lab Fine Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol DUT KTH Joint Educ &

    Res Ctr Mol Devices State Key Lab Fine Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol DUT KTH Joint Educ &

    Res Ctr Mol Devices State Key Lab Fine Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol DUT KTH Joint Educ &

    Res Ctr Mol Devices State Key Lab Fine Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol DUT KTH Joint Educ &

    Res Ctr Mol Devices State Key Lab Fine Chem Dalian 116024 Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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