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Amorphous Cobalt Phyllosilicate with Layered Crystalline Motifs as Water Oxidation Catalyst

Cited 36 time in Web of Science Cited 39 time in Scopus
Authors
Kim, Ju Seong; Park, Inchul; Jeong, Eun-Suk; Jin, Kyoungsuk; Seong, Won Mo; Yoon, Gabin; Kim, Hyunah; Kim, Byunghoon; Nam, Ki Tae; Kang, Kisuk
Issue Date
2017-06
Citation
Advanced Materials, Vol.29 No.21, p. 1606893
Keywords
electrocatalystlayered (oxy)hydroxidesoxygen evolution reactionphyllosilicatewater splitting
Abstract
The development of a high-performance oxygen evolution reaction (OER) catalyst is pivotal for the practical realization of a water-splitting system. Although an extensive search for OER catalysts has been performed in the past decades, cost-effective catalysts remain elusive. Herein, an amorphous cobalt phyllosilicate (ACP) with layered crystalline motif prepared by a room-temperature precipitation is introduced as a new OER catalyst; this material exhibits a remarkably low overpotential (eta approximate to 367 mV for a current density of 10 mA cm(-2)). A structural investigation using X-ray absorption spectroscopy reveals that the amorphous structure contains layered motifs similar to the structure of CoOOH, which is demonstrated to be responsible for the OER catalysis based on density functional theory calculations. However, the calculations also reveal that the local environment of the active site in the layered crystalline motif in the ACP is significantly modulated by the silicate, leading to a substantial reduction of. of the OER compared with that of CoOOH. This work proposes amorphous phyllosilicates as a new group of efficient OER catalysts and suggests that tuning of the catalytic activity by introducing redox-inert groups may be a new unexplored avenue for the design of novel high-performance catalysts.
ISSN
0935-9648
URI
http://hdl.handle.net/10371/165017
DOI
https://doi.org/10.1002/adma.201606893
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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