Premium
A Ternary Ni 46 Co 40 Fe 14 Nanoalloy‐Based Oxygen Electrocatalyst for Highly Efficient Rechargeable Zinc–Air Batteries
Author(s) -
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
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803372
Subject(s) - electrocatalyst , ternary operation , materials science , bifunctional , oxygen evolution , transition metal , supercritical fluid , chemical engineering , density functional theory , electrochemistry , catalysis , inorganic chemistry , chemistry , electrode , computational chemistry , organic chemistry , computer science , engineering , programming language , biochemistry
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 Ni 46 Co 40 Fe 14 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 °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 IrO 2 , 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.