Zhao Dengke, Ning Shunlian, Yu Xiaolong, Wu Qikai, Zhou Wei, Dan Jiacheng, Zhu Yuguang, Zhu Hao, Wang Nan, Li Ligui
Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Inzstitute, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environment and Energy, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China.
J Colloid Interface Sci. 2022 Mar;609:269-278. doi: 10.1016/j.jcis.2021.11.161. Epub 2021 Nov 27.
The exploration of efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) under alkaline conditions is an importantway to promote the development of electrolytic water technology. Herein, the reduced graphene oxide-supported MoO modified amorphous cobalt metaphosphate cubes (a-Co(PO)/MoO/rGO) as bifunctional OER/HER catalyst is prepared by anion exchange and phosphating, using the Prussian blue analogue (PBA) as a precursor. The resulting composite exhibits the low overpotentials (η) that of 290 and 50 mV for OER and HER in 1.0 M KOH solution at 10 mA cm, respectively. The electrochemical test and density functional theory (DFT) results reveal that the MoO-modified optimizes the adsorption/desorption energy of H* of Co(PO), thus enhance the HER activity. Benefiting from efficient HER and OER performances, an efficient and stable alkaline water electrolysis operation using a-Co(PO)/MoO/rGO used as bifunctional catalyst can be carried out, which can deliver a current density (j) of 20 mA cm at 1.65 V cell voltage and work continuously for 24 h.
探索在碱性条件下用于析氧反应（OER）和析氢反应（HER）的高效双功能电催化剂是推动电解水技术发展的重要途径。在此，以普鲁士蓝类似物（PBA）为前驱体，通过阴离子交换和磷化制备了还原氧化石墨烯负载的MoO修饰非晶态偏磷酸钴立方体（a-Co(PO)/MoO/rGO）作为双功能OER/HER催化剂。所得复合材料在1.0 M KOH溶液中，10 mA cm时OER和HER的过电位（η）分别低至290和50 mV。电化学测试和密度泛函理论（DFT）结果表明，MoO修饰优化了Co(PO)对H*的吸附/脱附能，从而提高了HER活性。受益于高效的HER和OER性能，使用a-Co(PO)/MoO/rGO作为双功能催化剂可进行高效稳定的碱性水电解操作，在1.65 V电池电压下可提供20 mA cm的电流密度（j）并持续工作24小时。
