Scholarlink

<p>The development of cost-effective and highly efficient catalytic electrodes is essential for advancing methanol oxidation reaction (MOR) and urea oxidation reaction (UOR), which are critical in new energy applications. In this study, three-dimensional Ni-Zn@Cu(OH)<sub>2</sub> core–shell nanorod array (CuNR)/copper foam (CF) porous electrodes were fabricated by first growing CuNR in situ on copper foam, followed by pulse electrodeposition of Ni and Zn. The influence of Zn incorporation on the morphology and electrocatalytic performance has been systematically investigated. As the zinc content in the deposition solution increased, the electrochemical performance of the samples initially improved but subsequently declined. The optimized Ni-Zn@CuNR catalytic electrode demonstrated excellent catalytic activity and long-term stability for both MOR and UOR. At 0.8&#xa0;V, the average current densities were 332.3&#xa0;mA cm<sup>−2</sup> with a Tafel slope of 35&#xa0;mV dec<sup>−1</sup> for MOR, and 327.3&#xa0;mA cm<sup>−2</sup> with a Tafel slope of 30&#xa0;mV dec<sup>−1</sup> for UOR. After 4000 cycles of cyclic voltammetry (CV) tests, the current densities of the Ni-Zn@CuNR electrode were maintained at 90.8% (MOR) and 107.4% (UOR) of their original values, respectively. The superior electrochemical performance can be attributed to high specific surface area of the electrode structure and the strong electronic interaction between Zn and Ni, which modulated the local electronic structure of Ni cations and enhanced the conductivity of the Ni-Zn@CuNR electrode. This work presents a highly active catalytic electrode, providing significant insights for the further development of highly active UOR and MOR.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Efficient and Long-Term Stable Ni-Zn@Cu(OH)2 Core–Shell Nanorod Arrays for Electrocatalytic Oxidation of Methanol and Urea

  • 期刊论文

  • 发表日期：

    2025年5月5日

查看全文
  • Guangya Hou,
  • Min Liu,
  • Jianli Zhang,
  • Qiang Chen,
  • Yiping Tang

摘要

The development of cost-effective and highly efficient catalytic electrodes is essential for advancing methanol oxidation reaction (MOR) and urea oxidation reaction (UOR), which are critical in new energy applications. In this study, three-dimensional Ni-Zn@Cu(OH)2 core–shell nanorod array (CuNR)/copper foam (CF) porous electrodes were fabricated by first growing CuNR in situ on copper foam, followed by pulse electrodeposition of Ni and Zn. The influence of Zn incorporation on the morphology and electrocatalytic performance has been systematically investigated. As the zinc content in the deposition solution increased, the electrochemical performance of the samples initially improved but subsequently declined. The optimized Ni-Zn@CuNR catalytic electrode demonstrated excellent catalytic activity and long-term stability for both MOR and UOR. At 0.8 V, the average current densities were 332.3 mA cm−2 with a Tafel slope of 35 mV dec−1 for MOR, and 327.3 mA cm−2 with a Tafel slope of 30 mV dec−1 for UOR. After 4000 cycles of cyclic voltammetry (CV) tests, the current densities of the Ni-Zn@CuNR electrode were maintained at 90.8% (MOR) and 107.4% (UOR) of their original values, respectively. The superior electrochemical performance can be attributed to high specific surface area of the electrode structure and the strong electronic interaction between Zn and Ni, which modulated the local electronic structure of Ni cations and enhanced the conductivity of the Ni-Zn@CuNR electrode. This work presents a highly active catalytic electrode, providing significant insights for the further development of highly active UOR and MOR.

Graphical Abstract