Construction hybrid water electrolysis systems by coupling the urea oxidation reaction (UOR) with the hydrogen evolution reaction (HER) can potentially increase the energy efficiency for H₂ production and remedy the environmental pollution of urea. In this work, we demonstrated the synthesis of a HER-UOR bifunctional self-supported composite electrode, composed of metal-organic framework-derived low-Ru-content-doped Co₂P nanoparticles/N-doped carbon composite nanosheets supported on 3D Ni foam substrates (Ru-Co₂P/N-C/NF). Benefiting from the synergism of compositional and structural merits, the resultant self-supported Ru-Co₂P/N-C/NF composite exhibited excellent electrocatalytic performance for both HER and UOR. Remarkably, the two-electrode urea electrolysis system composed of the bifunctional Ru-Co₂P/N-C/NF composite electrode as both the cathode and anode could achieve a current density of 100 mA cm^-2 with a voltage of 1.58 V in 1 M KOH containing 0.5 M urea.

通过将尿素氧化反应（UOR）与析氢反应（HER）耦合而构建的混合水电解系统可以潜在地提高H ₂生产的能源效率并纠正尿素的环境污染。在这项工作中，我们演示了HER-UOR双功能自支撑复合电极的合成，该电极由金属有机骨架衍生的低Ru掺杂的Co ₂ P纳米颗粒/ N掺杂的碳复合纳米片负载在3D Ni上泡沫基材（Ru-Co ₂ P / NC / NF）。受益于组成和结构优点的协同作用，生成的自支撑Ru-Co ₂P / NC / NF复合材料对HER和UOR均表现出优异的电催化性能。值得注意的是，由双功能Ru-Co ₂ P / NC / NF复合电极作为阴极和阳极组成的双电极尿素电解系统在1 M中可实现100 mA cm ^-2的电流密度和1.58 V的电压含有0.5 M尿素的KOH。