Interweaving between MnO2 nanowires/nanorods and carbon nanotubes as robust multifunctional electrode for both liquid and flexible electrochemical energy devices

JOURNAL OF POWER SOURCES

卷:455

Article

Xu, Nengneng^1,3  Liu, Jiawen²  Qiao, Jinli¹  Huang, Haitao⁴  Zhou, Xiao-Dong³ 

[1] Donghua Univ, Coll Environm Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, 2999 Renmin North Rd, Shanghai 201620, Peoples R China

[2] Shanghai Jinyuan Senior High Sch, 2169 Xincun Rd, Shanghai 200333, Peoples R China

[3] Univ Louisiana Lafayette, Dept Chem Engn, Lafayette, LA 70504 USA

[4] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Peoples R China

关键词: Multifunctional electrocatalyst;    Flexible;    Anion-exchange membrane;    Metal-air batteries;    Supercapacitors;   

DOI  :  10.1016/j.jpowsour.2020.227992

来源: Elsevier

【 摘 要 】

In this paper, as a proof-of-concept study, a newly designed multifunctional composite electrode materials consisting of an interweaving structure of MnO2 nanowires (NWs)/nanorods (NRs) and carbon nanotubes (CNTs) (MnO2-NWRs/CNTs) are directly synthesized by a facile and scalable strategy, which show high catalytic activity for both oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) processes and large specific capacitance for supercapacitors (SCs). Such a MnO2-NWRs/CNTs 350 material is induced by the strong coupling and synergistic effect between MnO2-NWRs and CNTs, as well as the coexistence of NRs/NWs and the existence of favorable crystal planes, which enable the multifunctional high-performance in zinc-air batteries (ZABs), magnesium-air batteries (MABs), SCs and also their flexible devices. The MnO2-NWRs/CNTs 350 catalyst exhibits high electrochemical activity (SE: 0.98 V), decent capacitance (1183 F g(-1)) and excellent battery performance (specifically, 640 mW cm(-2) for MABs). In MnO2-NWRs/CNTs 350, the (110) and (101) crystal planes of MnO2 NWRs are advantageous for both ORR and OER processes. Additionally, the structural changes of MnO2-NWRs/CNTs 350 (the coexistent NRs and NWs) improve the capacitance of the material. Even more encouraging, the interweaving structure endows the flexible rechargeable MABs, ZABs, and SCs with excellent electrochemical performance in terms of both activity and stability.

【 授权许可】

Free