Journal
ACS NANO
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c06700
Keywords
single atom catalysts; 2D nanosheets; bifunctional electrocatalysts; electrospinning; free-standing electrode; zinc-air batteries
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Funding
- National Natural Science Foundation of China [51778218]
- Science and Technology Innovation Plan of Hunan Province [2020JJ6043, 2019RS3015]
- HAADF-STEM from Analytical Instrumentation Center of Hunan University
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This study reports a Janus-structured flexible free-standing bifunctional oxygen electrocatalyst, with OER-active O, N co-coordinated Ni single atoms and ORR-active Co3O4@Co1-xS nanosheet arrays integrated separately on the inner and outer walls of flexible hollow carbon nanofibers. With the sophisticated topological structure and atomic-level-designed chemical compositions, the catalyst exhibits outstanding bifunctional catalytic activity and demonstrates excellent performance in both liquid and all-solid-state zinc-air batteries.
Flexible solid-state zinc-air batteries (ZABs) with low cost, excellent safety, and high energy density has been considered as one of ideal power sources for portable and wearable electronic devices, while their practical applications are still hindered by the kinetically sluggish cathodic oxygen reduction and oxygen evolution reactions (ORR/OER). Herein, a Janus-structured flexible free-standing bifunctional oxygen electrocatalyst, with OER-active O, N co-coordinated Ni single atoms and ORR-active Co3O4@Co1-xS nanosheet arrays being separately integrated at the inner and outer walls of flexible hollow carbon nanofibers (Ni-SAs/HCNFs/Co-NAs), is reported. Benefiting from the sophisticated topological structure and atomic-level-designed chemical compositions, Ni-SAs/ HCNFs/Co-NAs exhibits outstanding bifunctional catalytic activity with the delta E index of 0.65 V, representing the current state-of-the-art flexible free-standing bifunctional ORR/OER electrocatalyst. Impressively, the Ni-SAs/HCNFs/Co-NAs-based liquid ZAB show a high open-circuit potential (1.45 V), high capacity (808 mAh g(-1) Zn), and extremely long life (over 200 h at 10 mA cm(-2)), and the assembled flexible all-solid-state ZABs have excellent cycle stability (over 80 h). This work provides an efficient strategy for developing high-performance bifunctional ORR/OER electrocatalysts for commercial applications.
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