Two-Dimensional Hierarchical CoTe/NiFe Layered Double Hydroxide Heterostructure for High-Performance Electrocatalytic Water Oxidation
- Authors
- Park, Keemin; Choi, Seunggun; Kwon, Jiseok; Kim, Jaeik; Jo, Seonghan; Lee, Kangchun; Park, Ho Bum; Han, HyukSu; Paik, Ungyu; Song, Taeseup
- Issue Date
- Mar-2023
- Publisher
- American Chemical Society
- Keywords
- oxygen evolution reaction; heterostructure; electrocatalyst; metal-metalloid; layered double hydroxide
- Citation
- ACS Applied Energy Materials, v.6, no.6, pp.3432 - 3441
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Energy Materials
- Volume
- 6
- Number
- 6
- Start Page
- 3432
- End Page
- 3441
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191593
- DOI
- 10.1021/acsaem.2c04146
- ISSN
- 2574-0962
- Abstract
- The development of high-performance electrocatalysts with low cost is essential for electrocatalytic water oxidation. Here, we report a strategy for boosting oxygen evolution reaction (OER) catalytic activity of the NiFe layered double hydroxide (LDH) by implementing metal-metalloid compounds of CoTe nanosheets (NSs). The hybridized material (CoTe NS/NiFe LDH) shows an intriguing hierarchical 2D-2D heterostructure, where the intact interface between the CoTe NS and NiFe LDH is formed. Self-supported growth of the CoTe NS on the NiFe LDH improves charge transfer and reaction kinetics during the OER due to the enhanced metal-oxygen covalency caused by shifting metal d-orbitals and oxygen p-orbitals from the Fermi level. Moreover, the hierarchical heterostructure of the nanometer-scale CoTe NS on the micrometer-scale NiFe LDH could maximize the number of active sites for the OER. Therefore, CoTe NS/NiFe LDH exhibits low overpotentials of 235 and 252 mV at 30 and 80 mA cm-2 in an alkaline condition (1 M aqueous KOH solution), respectively, with excellent stability over 120 h, outperforming the benchmark RuO2 catalyst.
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