| 多孔枝晶镍铜合金的制备及其电催化析氢、肼氧化性能 | |
| Synthesis of Porous Dendritic Nickel-Copper Alloy and Electroctalytic Performances Towards Hydrogen Evolution and Hydrazine Oxidation | |
| 摘要: 以镍网（NM）为基体，采用氢气泡模板法合成了独立分相金属Ni、Cu为主晶相、具有四级复合微纳结构的镍铜合金电催化剂（NiCu/NM）。在电催化析氢（HER）及肼氧化（HzOR）反应中，NiCu/NM表现出优良的催化活性，在1.0 mol·L-1 KOH（含0.5 mol·L-1 N2H4·H2O）溶液中，电流密度为10 mA·cm-2时，其需要的HER及HzOR过电势分别为104和41 mV；在双电极体系中，电流密度为100 mA·cm-2时，NiCu/NM的分解槽压仅为0.536 V，远低于全水分解过程所需的1.921 V，大大提高了电池的产氢效率。无论三电极体系还是双电极体系，NiCu/NM均表现出优异的催化活性及稳定性。分析认为，镍铜合金薄膜的多级复合结构使其展现出增大了近14倍的电化学活性面积（ECSA），为电催化反应提供了大量催化活性位点，也为电极表面的电荷传输、物质传递提供了充足的通道；Cu的掺入提高了材料的本征HER活性，两者协同促进了电催化活性的提升，其中NiCu/NM的结构优势对其优良的催化性能起主导作用。 | |
| 关键词: 电解水 镍铜合金 氢气泡模板法 析氢反应 肼氧化反应 | |
| 基金项目: 陕西省自然科学基础研究计划项目（No.2019JM-092）、陕西省教育厅重点科学研究项目（No.17JS036）和商洛学院应用催化科研团队（No.19SCX01）资助。 | |
| Abstract: Herein, we report quadruple-hierarchy micro-nano structured nickel-copper alloy electrocatalysts with phase-separated metallic Ni and Cu as the main crystal phase, which were grown in situ on nickel mesh (NM) substrate by hydrogen bubble-template method. During hybrid water electrolysis, NiCu/NM electrode only requires hydrogen evolution reaction (HER) overpotential and hydrazine oxidation (HzOR) potential of 104 and 41 mV to afford 10 mA·cm-2, respectively, in 1 mol·L-1 KOH containing 0.5 mol·L-1 N2H4·H2O. Integrated into a hybrid cell, the NiCu/NM couple require a cell voltage of only 0.536 V to deliver a current density of 100 mA·cm-2, far lower than that of overall water splitting (1.921 V), giving rise to the great improvement of hydrogen-producing efficiency. Whether in three-electrode or two-electrode devices, the as-obtained catalyst displays superior electrocatalytic activity and stability towards HER or HzOR. The remarkable catalytic performance is attributed to two key factors. On the one hand, multiple-hierarchy structured NiCu alloy films with 14-fold increased ECSA expose huge number of catalytic active sites and present sufficient channels for charge transfer and material transfer on the electrode surface in both HER and HzOR. On the other hand, the strong synergistic effect induced by Cu-doping brings great improvement of intrinsic HER activity of electrode materials. The both factors contribute collectively to the superior electrocatalytic performances of NiCu/NM during hybrid water splitting, and the structural advantages of the unique 3D hierarchical porous macro-nano structures are the dominant factors. | |
| Keywords: water electrolysis nickel-copper alloy hydrogen bubble-template method hydrogen evolution reaction hydrazine oxidation | |
| 投稿时间：2019-12-25 修订日期：2020-02-26 | |
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| 孙强强,周春生,张国春,王增林.多孔枝晶镍铜合金的制备及其电催化析氢、肼氧化性能[J].无机化学学报,2020,36(4):703-714. | |
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