Uniform Fe2 O3 Nanospheres Anchored on Multilayer Graphene as Anode Materials for High-Rate Ni-Fe Batteries

Junming Xu; Ke Wei; Jianfeng Wu; Jun Wu; Tao Zhou; J P Cheng; Xiaoping Hu

doi:10.1002/cplu.202300315

Uniform Fe₂ O₃ Nanospheres Anchored on Multilayer Graphene as Anode Materials for High-Rate Ni-Fe Batteries

Chempluschem. 2023 Sep;88(9):e202300315. doi: 10.1002/cplu.202300315.

Authors

Junming Xu¹, Ke Wei¹, Jianfeng Wu², Jun Wu¹, Tao Zhou¹, J P Cheng³, Xiaoping Hu⁴

Affiliations

¹ College of Electronic Information, Hangzhou Dianzi University, 310018, Hangzhou, China.
² College of Information Science & Technology, Zhejiang Shuren University, 310015, Hangzhou, China.
³ School of Materials Science & Engineering, Zhejiang University, 310027, Hangzhou, China.
⁴ Hangzhou Dianzi University Information Engineering College, 311305, Hangzhou, China.

PMID: 37565738
DOI: 10.1002/cplu.202300315

Abstract

Ni-Fe battery is one of prospective aqueous alkaline batteries due to its high safety, eco-friendliness and cost-effectiveness. However, the electrochemical performance of Fe-based anodes is limited due to the particle aggregation and low electric conductivity. In this work, iron powder is used as a precursor in a chemical bath deposition method. By optimizing the concentration of HNO₃ , a balanced dissolution-crystallization process is achieved to obtain uniform Fe₂ O₃ nanospheres in size between 60 and 90 nm, which are separately anchored on ultrasonically prepared multilayer graphene (MLG). This composite delivers specific discharge capacities of 191.1 and 160.8 mAh g^-1 at the current densities of 2 and 10 A g^-1 , respectively. A Ni-Fe battery with the as-prepared Fe₂ O₃ /MLG as anode and Ni(OH)₂ /MLG as cathode exhibits an energy density of 69.5 Wh kg^-1 at a high power density of 3931.6 W kg^-1 .

Keywords: Ni−Fe batteries; electrode materials; energy storage; multilayer graphene; nanoparticles.

Abstract

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