双功能
阳极
阴极
电化学
电解
化学
分解水
化学工程
电解水
质子交换膜燃料电池
材料科学
无机化学
电极
催化作用
有机化学
光催化
物理化学
电解质
工程类
作者
Jiuyi Sun,Qin Yue,Xiaopo Niu,Rong Zhao,Zhihong Xu,Danni Liu,Wenli Zhao,Lili Guo,Nan Jiang,Chang Liu,Kaige Zhang,Junfeng Zhang,Qingfa Wang
标识
DOI:10.1016/j.jcis.2024.01.151
摘要
Exploring the electrocatalysts with high intrinsic activity and stability for both anode and cathode to tolerate the extremely acidic condition in proton exchange membrane water electrolyzer (PEMWE) is crucial for widespread industrial application. Herein, we constructed the bifunctional IrCox nanoalloys with abundant metal vacancies via the combination of chemical reduction and electrochemical treatment for overall water splitting. The developed IrCo0.13 exhibits ultra-low overpotentials of 238 mV for OER and 18.6 mV for HER at 10 mA cm−2 in 0.1 M HClO4, and achieves the exceptional stability of 1000 h for OER and 100 h for HER at 10 mA cm−2. Further, the cell voltage is only 1.68 V to reach a high current density of 1 A cm−2 in PEMWE with IrCo0.13 as the both cathode and anode catalytic layer, and it shows excellent corrosion resistance in acidic environment, evidenced by 415 h stable operation at 1 A cm−2. The strong electronic interactions in the Ir-Co atomic heterostructure and the in-situ generation of Co vacancies by electrochemical oxidation synergistically contribute to the enhanced activity and stability via optimizing the electronic structure of adjacent Ir active sites, enhancing the conductivity and electrochemical active surface area of the catalyst, accelerating charge transfer and kinetics. This work provides a new perspective for designing bifunctional catalysts for practical application in PEMWE.
科研通智能强力驱动
Strongly Powered by AbleSci AI