Heuristic Iron–Cobalt-Mediated Robust pH-Universal Oxygen Bifunctional Lusters for Reversible Aqueous and Flexible Solid-State Zn–Air Cells
- Title
- Heuristic Iron–Cobalt-Mediated Robust pH-Universal Oxygen Bifunctional Lusters for Reversible Aqueous and Flexible Solid-State Zn–Air Cells
- Author
- 이정호
- Keywords
- single/dual atoms; pH-universal oxygen bifunctional activity; alkaline; neutral; acidic; flexible solid-state zinc-air cells
- Issue Date
- 2021-08
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS NANO, v. 15, NO 9, Page. 14683-14696
- Abstract
- Rechargeable aqueous zinc−air cells (ZACs) promise
an extremely safe and high energy technology. However, they are
still significantly limited by sluggish electrochemical kinetics and
irreversibility originating from the parasitic reactions of the
bifunctional catalysts and electrolytes. Here, we report the
preferential in situ building of interfacial structures featuring the
edge sites constituted by FeCo single/dual atoms with the
integration of Co sites in the nitrogenized graphitic carbon
frameworks (FeCo SAs@Co/N-GC) by electronic structure
modulation approach. Compared to commercial Pt/C and RuO2,
FeCo SAs@Co/N-GC reveals exceptional electrochemical performance, reversible redox kinetics, and durability toward oxygen
reduction and evolution reactions under universal pH environments, i.e., alkaline, neutral, and acidic, due to synergistic effect at
interfaces and preferred charge/mass transfer. The aqueous (alkaline, nonalkaline, and acidic electrolytes) ZACs constructed
with a FeCo SAs@Co/N-GC cathode tolerate stable operations, have significant reversibility, and have the highest energy
densities, outperforming those of noble metal counterparts and state-of-the-art ZACs in the ambient atmosphere. Additionally,
flexible solid-state ZACs demonstrate excellent mechanical and electrochemical performances with a highest power density of
186 mW cm−2
, specific capacity of 817 mAh gZn−1
, energy density of 1017 Wh kgZn−1
, and cycle life >680 cycles with extremely
harsh operating conditions, which illustrates the great potential of triphasic catalyst for green energy storage technologies.
- URI
- https://pubs.acs.org/doi/10.1021/acsnano.1c04471https://repository.hanyang.ac.kr/handle/20.500.11754/168803
- ISSN
- 19360851; 1936086X
- DOI
- 10.1021/acsnano.1c04471
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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