Highly active and durable carbon nitride fibers as metal-free bifunctional oxygen electrodes for flexible Zn-air batteries
- Authors
- Shinde, Sambhaji S.; Yu, Jin-Young; Song, Jae-Won; Nam, Yoon-Ho; Kim, Dong-Hyung; Lee, Jung-Ho
- Issue Date
- Nov-2017
- Publisher
- Royal Society of Chemistry
- Citation
- Nanoscale horizons, v.2, no.6, pp.333 - 341
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nanoscale horizons
- Volume
- 2
- Number
- 6
- Start Page
- 333
- End Page
- 341
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/8490
- DOI
- 10.1039/c7nh00058h
- ISSN
- 2055-6756
- Abstract
- The design of flexible, highly energetic, and durable bifunctional oxygen electrocatalysts is indispensable for rechargeable metal-air batteries. Herein we present a simple approach for the development of carbon nitride fibers co-doped with phosphorus and sulfur, grown in situ on carbon cloth (PS-CNFs) as a flexible electrode material, and demonstrate its outstanding bifunctional catalytic activities toward ORR and OER compared to those of precious metal-based Pt/C and IrO2 on account of the dual action of P and S, numerous active sites, high surface area, and enhanced charge transfer. Furthermore, we demonstrate the flexibility, suitability, and durability of PS-CNFs as air electrodes for primary and rechargeable Zn-air batteries. Primary Zn-air batteries using this electrode showed high peak power density (231 mW cm(-2)), specific capacity (698 mA h g(-1); analogous energy density of 785 W h kg(-1)), open circuit potential (1.49 V), and outstanding durability of more than 240 h of operation followed by mechanical recharging. Significantly, three-electrode rechargeable Zn-air batteries revealed a superior charge-discharge voltage polarization of similar to 0.82 V at 20 mA cm(-2), exceptional reversibility, and continuous charge-discharge cycling stability during 600 cycles. This work provides a pioneering strategy for designing flexible and stretchable metal-free bifunctional catalysts as gas diffusion layers for future portable and wearable renewable energy conversion and storage devices.
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