Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105021
Keywords
air electrodes; electrospinning; membranes; oxygen electrocatalysts; Zn-air batteries
Categories
Funding
- National Natural Science Foundation of China [22075092]
- China Postdoctoral Science Foundation [2020TQ0202]
- Program for HUST Academic Frontier Youth Team [2018QYTD15]
- Innovation and Talent Recruitment Base of New Energy Chemistry and Device [B21003]
- Center for Nanoscale Characterization Devices (CNCD)
- WNLO of HUST
- Analytical and Testing Center of Huazhong University of Science and Technology for XRD
- SEM
- TEM
- XPS measurements
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A self-standing membrane composed of hierarchical cobalt/nanocarbon nanofibers was fabricated using the electrospinning technique, which can be directly utilized as the bifunctional air electrode in zinc-air batteries to achieve high peak power density and long service life. The assembled solid-state zinc-air battery exhibits promising power density and decent flexibility, thanks to the integration of oxygen electrocatalysts with abundant cobalt-nitrogen-carbon active species in the hierarchical electrode structure.
Integrating high-efficiency oxygen electrocatalyst directly into air electrodes is vital for zinc-air batteries to achieve higher electrochemical performance. Herein, a self-standing membrane composed of hierarchical cobalt/nanocarbon nanofibers is fabricated by the electrospinning technique. This hybrid membrane can be directly employed as the bifunctional air electrode in zinc-air batteries and can achieve a high peak power density of 304 mW cm(-2) with a long service life of 1500 h at 5 mA cm(-2). Its assembled solid-state zinc-air battery also delivers a promising power density of 176 mW cm(-2) with decent flexibility. The impressive rechargeable battery performance would be attributed to the self-standing membrane architecture integrated by oxygen electrocatalysts with abundant cobalt-nitrogen-carbon active species in the hierarchical electrode. This study may provide effective electrospinning solutions in integrating efficient electrocatalyst and electrode for energy storage and conversion technologies.
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