Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (3): 479-487.doi: 10.1007/s40242-020-0056-8

• Articles • Previous Articles     Next Articles

One-step In-situ Synthesis of Vacancy-rich CoFe2O4@Defective Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn-Air Batteries

WANG Xin1, ZHUANG Linzhou2, JIA Yi1, ZHANG Lijie3, YANG Qin4, XU Wenjia3, YANG Dongjiang3, YAN Xuecheng1, ZHANG Longzhou1, ZHU Zhonghua2, BROWN Christopher L.1, YUAN Pei4, YAO Xiangdong1,5   

  1. 1. School of Environment and Science, and Queensland Micro-and Nanotechnology Centre, Griffith University, Nathan Campus, Queensland 4111, Australia;
    2. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia;
    3. Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Institute of Marine Biobased Materials, College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, P. R. China;
    4. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou 350002, P. R. China;
    5. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2020-03-09 Revised:2020-03-23 Online:2020-06-01 Published:2020-05-30
  • Contact: YUAN Pei, YAO Xiangdong E-mail:x.yao@griffith.edu.au
  • Supported by:
    Supported by the Project of the Australia Research Council(No.ARC DP200103043), the "111" Project of China (Nos.B07016, B17020) and the ARC Discovery Early Career Researcher Award(No.ARC DE180101030).

Abstract: Developing efficient catalysts toward both oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is the core task for rechargeable metal-air batteries. Although integration of two active components should be an effective method to produce the bifunctional catalysts in principle, traditional techniques still can not attain fine tunable surface structure during material-hybridization process. Herein, we present a facile short-time in-situ argon(Ar) plasma strategy to fabricate a high-performance bifunctional hybrid catalyst of vacancy-rich CoFe2O4 synergized with defective graphene(r-CoFe2O4@DG). Reflected by the low voltage gap of 0.79 V in two half-reaction measurements, the striking capability to catalyze ORR/OER endows it excellent and durable performance in rechargeable Zn-air batteries, with a maximum power density of 155.2 mW/cm2 and robust stability(up to 60 h). Further experimental and theoretical studies validate its remarkable bifunctional energetics root from plasma-induced surface vacancy defects and interfacial charge polarization between DG and CoFe2O4. This work offers more opportunities for reliable clean energy systems by rational interfacial and defect engineering on catalyst design.

Key words: Defect, CoFe2O4, Oxygen reduction, Oxygen evolution, Zn-air battery