NiCo2O4/Ru复合催化剂的制备及锌空电池的应用

Preparation of NiCo2O4/Ru Composite Catalysts and Application of Zn⁃Air Batteries

杨扬 孟超 胡涵 吴明铂

Yang Yang Chao Meng Han Hu Mingbo Wu

中国石油大学（华东） 化学化工学院，重质油国家重点实验室，山东 青岛 266580 中国石油大学（华东） 新能源学院，山东 青岛 266580

State Key Laboratory of Heavy Oil Processing，College of Chemistry and Chemical Engineering，China University of Petroleum，Qingdao Shandong 266580，China College of New Energy，China University of Petroleum，Qingdao Shandong 266580，China

以六水合硝酸镍（Ni(NO3)2·6H2O）为镍源、六水合硝酸钴（Co(NO3)2·6H2O）为钴源、尿素为沉淀剂，采用水热法制备NiCo2O4纳米棒，然后浸渍还原RuCl3，得到了NiCo2O4/Ru复合催化剂。利用X射线衍射（XRD）、扫描电子显微镜（SEM）等测试技术，对复合催化剂的物相、形貌进行了表征。通过线性扫描伏安法（LSV）、电化学阻抗谱（EIS）等电化学测试手段，对催化剂的氧还原反应（ORR）和析氧反应（OER）的催化性能进行了研究。将NiCo2O4/Ru复合催化剂作为正极组装锌空电池，使用蓝电电池测试仪评价了其开路电压、充放电性能和循环稳定性等指标。结果表明，NiCo2O4/Ru复合催化剂在电流密度为10.0 mA/cm2时，析氧过电位为420 mV，氧还原半波电位为0.77 V，且具有较高的ORR/OER双功能催化活性；由NiCo2O4/Ru复合催化剂组装的锌空电池开路电压为1.37 V，峰值功率密度为143 mW/cm2，且能稳定循环50 h。

The NiCo2O4 nanorods were prepared by a hydrothermal method with nickel nitrate hexahydrate （Ni(NO3)2·6H2O） as the nickel source,cobalt nitrate hexahydrate （Co(NO3)2·6H2O） as the cobalt source,and urea as the precipitant.Then the above NiCo2O4 nanorods were immersed into the RuCl3 solution to obtain the NiCo2O4/Ru composite catalyst by reduction.Testing technologies such as X?ray diffraction (XRD) and scanning electron microscopy (SEM) were adopted to characterize the phase structure and morphology of this composite catalyst, and its catalytic performance toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) was investigated by electrochemical methods such as linear scan voltammogram (LSV) and electrochemical impedance spectroscopy (EIS). Moreover, the NiCo2O4/Ru composite catalyst was used as the anode to assemble the Zn?air battery, whose open circuit voltage,charge and discharge performance,and cycle stability were evaluated by a LANHE test system. The results show that the NiCo2O4/Ru composite catalyst has high ORR/OER bifunctional catalytic activity with an OER overpotential of 420 mV at 10.0 mA/cm2 and an ORR half?wave potential of 0.77 V.The assembled Zn?air battery also exhibits an open circuit voltage of 1.37 V, a maximum power density of 143 mW/cm2,as well as robust cycle stability for 50 hours.

国家自然科学基金项目(51901115);山东省自然科学基金项目(ZR2020ZD08)

10.3969/j.issn.1006-396X.2022.05.007