The electrooxidation of urea is identified as a prospective route for the degradation of urea-rich wastewater and hydrogen generation. Here, we report a controllable synthetic strategy to develop CuO-Ni(OH)₂-d nanosheets by deliberately selecting S₂O₃²⁻ as the coordinating etchant toward to Cu₂O template and optimize the reaction conditions. The CuO-Ni(OH)₂-d is composed of CuO quadrangle nanosheets (100–200 nm) dispersed with Ni(OH)₂ nanoparticles. As predicted, The CuO-Ni(OH)₂-d nanosheets catalysts exhibit high UOR activities at 1.41 V vs. RHE to achieve the current density of 10 mA cm⁻² under the condition of 1 M KOH with 0.33 M urea. The CuO-Ni(OH)₂-d nanosheets catalyst also emerges a higher current density of 21.5 mA cm⁻², which is about 5.3, 6.8, 30, and 2 times larger than those of commercial Ni(OH)₂, CuO-Ni(OH)₂-a, CuO-Ni(OH)₂-b and CuO-Ni(OH)₂-c at 1.52 V vs. RHE, respectively. In particular, the CuO-Ni(OH)₂-d nanosheets catalysts exhibited the best catalytic stability performance. After the 36 h I-T test, the current density has no noticeable decreasing compared with the initial current density. This work could present a strategy for the design of advanced electrode materials that can be further applied in urea-rich wastewater remediation.

尿素的电氧化被认为是降解富含尿素的废水和产生氢气的潜在途径。在这里，我们报告了通过有选择地选择S ₂ O ₃ ^2-作为配向蚀刻剂的Cu ₂ O模板并优化反应条件来开发CuO-Ni（OH）₂ -d纳米片的可控合成策略。CuO-Ni（OH）₂ -d由分散有Ni（OH）₂纳米粒子的CuO四边形纳米片（100-200 nm）组成。如所预测的，CuO-Ni（OH）₂ -d纳米片催化剂在相对于RHE的1.41 V下表现出较高的UOR活性，以实现10 mA cm ^-2的电流密度在1 M KOH和0.33 M尿素的条件下 CuO-Ni（OH）₂ -d纳米片状催化剂还出现了21.5 mA cm ^-2的更高电流密度，这比市售Ni（OH）_2的电流密度大5.3、6.8、30和2倍。Ni（OH）₂ -a，CuO-Ni（OH）₂ -b和CuO-Ni（OH）₂ -c相对于RHE分别为1.52V。特别是CuO-Ni（OH）₂-d纳米片催化剂表现出最佳的催化稳定性能。经过36小时的IT测试后，电流密度与初始电流密度相比没有明显下降。这项工作可以为高级电极材料的设计提供一种策略，该策略可以进一步应用于富尿素废水的修复。