A Ternary Ni46Co40Fe14 Nanoalloy-Based Oxygen Electrocatalyst for Highly Efficient Rechargeable Zinc–Air Batteries
- Authors
- Nam, Gyutae; Son, Yeonguk; Park, Sung O.; Jeon, Woo Cheol; Jang, Haeseong; Park, Joohyuk; Chae, Sujong; Yoo, Youngshin; Ryu, Jaechan; Kim, Min Gyu; Kwak, Sang Kyu; Cho, Jaephil
- Issue Date
- Nov-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- oxygen evolution reaction; oxygen reduction reaction; supercritical reactions; ternary nanoalloys; Zn-air batteries
- Citation
- ADVANCED MATERIALS, v.30, no.46
- Journal Title
- ADVANCED MATERIALS
- Volume
- 30
- Number
- 46
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69291
- DOI
- 10.1002/adma.201803372
- ISSN
- 0935-9648
1521-4095
- Abstract
- Replacing noble-metal-based oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts is the key to developing efficient Zn-air batteries (ZABs). Here, a homogeneous ternary Ni46Co40Fe14 nanoalloy with a size distribution of 30-60 nm dispersed in a carbon matrix (denoted as C@NCF-900) as a highly efficient bifunctional electrocatalyst produced via supercritical reaction and subsequent heat treatment at 900 degrees C is reported. Among all the transition-metal-based electrocatalysts, the C@NCF-900 exhibits the highest ORR performance in terms of half-wave potential (0.93 V) in 0.1 m KOH. Moreover, C@NCF-900 exhibits negligible activity decay after 10 000 voltage cycles with minor reduction (0.006 V). In ZABs, C@NCF-900 outperforms the mixture of Pt/C 20 wt% and IrO2, cycled over 100 h under 58% depth of discharge condition. Furthermore, density functional theory (DFT) calculations and in situ X-ray absorption spectroscopy strongly support the active sites and site-selective reaction as a plausible ORR/OER mechanism of C@NCF-900.
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