Three‐dimensional interconnected graphene network‐based high‐performance air electrode for rechargeable zinc‒air batteries
Jia‐Xing An,
Yu Meng,
Hong‐Bo Zhang,
Yuanzhi Zhu,
Xiaohua Yu,
Ju Rong,
Peng‐Xiang Hou,
Chang Liu,
Hui‐Ming Cheng,
Jin‐Cheng Li
Affiliations
Jia‐Xing An
Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and Technology Kunming China
Yu Meng
Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China
Hong‐Bo Zhang
Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and Technology Kunming China
Yuanzhi Zhu
Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and Technology Kunming China
Xiaohua Yu
Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming China
Ju Rong
Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming China
Peng‐Xiang Hou
Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China
Chang Liu
Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China
Hui‐Ming Cheng
Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China
Jin‐Cheng Li
Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and Technology Kunming China
Abstract Although zinc‒air batteries (ZABs) are regarded as one of the most prospective energy storage devices, their practical application has been restricted by poor air electrode performance. Herein, we developed a free‐standing air electrode that is fabricated on the basis of a multifunctional three‐dimensional interconnected graphene network. Specifically, a three‐dimensional interconnected graphene network with fast mass and electron transport ability, prepared by catalyzing growth of graphene foam on nickel foam and then filling reduced graphene oxide into the pores of graphene foam, is used to anchor iron phthalocyanine molecules with atomic Fe‒N4 sites for boosting the oxygen reduction during discharging and nanosized FeNi hydroxides for accelerating the oxygen evolution during charging. As a result, the obtained air electrode exhibited an ultra‐small electrocatalytic overpotential of 0.603 V for oxygen reactions, a high peak power density of 220.2 mW cm‒2, and a small and stable charge‒discharge voltage gap of 0.70 V at 10 mA cm‒2 after 1136 cycles. Furthermore, in situ Raman spectroscopy together with theoretical calculations confirmed that phase transformation of FeNi hydroxides takes place from α‐Ni(OH)x to β‐Ni(OH)x to γ‐Ni(3+δ)+OOH for the oxygen evolution reaction and Ni is the active center while Fe enhances the activity of Ni active sites.
