NiMn MOF尿素氧化辅助电解海水的研究

Seawater electrolysis assisted by NiMn MOF-mediated urea oxidation

为解决海水电解过程中氯离子对电极的腐蚀与析氯竞争反应的问题,通过水热法和退火处理在泡沫镍上制得一种耐腐蚀的NiMn MOF-300/NF来作为尿素氧化的电催化剂,并利用氧化电位更低的尿素氧化反应来代替阳极氧化反应,可有效抑制析氯反应并显著降低海水电解能耗。该催化剂在200 mA/cm2的电流密度下所需电位仅为1.37 V,比单纯电解海水的过电位低340 mV,在50 mA/cm2的电流密度下可连续反应48 h而催化性能无明显衰减,展现出优良的电催化活性与稳定性。该方法为海水电解的大规模实际应用提供了新的思路。

To address the issues of electrode corrosion caused by chloride ions and chlorine evolution reaction during seawater electrolysis,a corrosion-resistant NiMn MOF-300/NF on nickel foam was created through hydrothermal and annealing processes.This material was used as an electrocatalyst for urea oxidation,which has a lower oxidation potential compared to anodic oxidation.By utilizing urea oxidation,the chlorine evolution reaction was effectively suppressed,leading to a significant reduction in energy consumption during seawater electrolysis.The catalyst exhibits a voltage requirement of only 1.37 V at a current density of 200 mA/cm2,which is 340 mV lower than the overpotential observed in seawater electrolysis alone.Furthermore,the catalyst demonstrates exceptional electrocatalytic activity and stability,as it can sustain the reaction continuously for 48 hours at a current density of 50 mA/cm2 without any noticeable decrease in performance.This approach provides new insights for the practical implementation of large-scale seawater electrolysis.