【摘要】 利用丙三醇、尿素和氯化钴构建三元低共熔溶剂（DES）体系，通过低共熔溶剂热法一步制备出三维纳米花状的泡沫镍负载CoCO₃-NiOOH催化剂（CoCO₃-NiOOH/NF（D））。结果表明：泡沫镍载体与三元DES体系在溶剂热条件下原位发生反应，生成富氧空位缺陷的CoCO₃和NiOOH复合物，其三维导电网状结构有效促进界面电子迁移和活性位点的暴露；制备的CoCO₃-NiOOH/NF（D）催化剂表现出优异的电催化析氧（OER）性能，在电流密度为20 mA/cm²时过电位仅为295 mV,Tafel斜率为78.1 mV/dec,性能远优于传统水热法合成的CoCO₃-NiOOH/NF（W）催化剂（407 mV,112.8 mV/dec）;CoCO₃-NiOOH/NF（D）催化剂还表现出优异的循环稳定性，在长期稳定性测试60 h后，其电流密度保留率达92%。更多还原

【Abstract】 A ternary deep-eutectic solvent（DES） system was constructed using glycerol, urea, and cobalt chloride. And a three-dimensional nanoflower-like nickel foam-supported CoCO₃-NiOOH catalyst（CoCO₃-NiOOH/NF（D）） was fabricated through one-step deep-eutectic solvothermal method. The results show that the foam nickel support in situ reacts with the ternary DES under solvothermal conditions, resulting in a composite of CoCO₃ and NiOOH enriched with oxygen vacancy defects. The three-dimensional conductive network effectively promotes interfacial electron transfer and the exposure of active sites. The prepared CoCO₃-NiOOH/NF（D） catalyst exhibits excellent electrocatalytic oxygen evolution（OER） performance. The overpotential is only 295 mV at a current density of 20 mA/cm² and the Tafel slope is 78.1 mV/dec. The performance is much better than the CoCO₃-NiOOH/NF（W） catalyst synthesized by the traditional hydrothermal method（ 407 mV, 112.8 mV/dec）. Additionally, the CoCO₃-NiOOH/NF（D） catalyst also demonstrates excellent cycling stability, maintaining a current density retention rate of 92% after a long-term stability test of 60 h.更多还原