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Plasma-induced oxygen vacancies in amorphous MnOx boost catalytic performance for electrochemical CO2 reduction

Title
Plasma-induced oxygen vacancies in amorphous MnOx boost catalytic performance for electrochemical CO2 reduction
Authors
HAN, HYUNSUJIN, SONGPARK, SEONGMINKIM, YOONGONJANG, DAEHEESEO, MIN HOKIM, WON BAE
Date Issued
Jan-2021
Publisher
Elsevier BV
Abstract
Recently, oxygen vacancy engineering represents a new direction for rational design of high-performance catalysts for electrochemical CO2 reduction (CO2RR). In this work, a series of amorphous MnOx catalysts with different concentrations of oxygen vacancies, namely, low (a-MnOx-L), pristine (a-MnOx-P), and high oxygen vacancy (a-MnOx-H), have been prepared by simple plasma treatments. The resultant a-MnOx-H catalyst with a larger amount of oxygen vacancy on the catalyst surface is able to preferentially convert CO2 to CO with a high Faradaic efficiency of 94.8% and a partial current density of 10.4 mA cm−2 even at a relatively lower overpotential of 510 mV. On the basis of detailed experimental results and theoretical density functional theory (DFT) calculations, the enhancement of CO production is attributable to the abundant oxygen vacancies formed in the amorphous MnOx which should favor CO2 adsorption/activation and promote charge transfer with the catalyst for efficient CO2 reduction.
Keywords
Carbon dioxide; Catalysts; Charge transfer; Density functional theory; Design for testability; Manganese compounds; Reduction; Catalyst surfaces; Catalytic performance; Faradaic efficiencies; High oxygen vacancies; Partial currents; Plasma treatment; Rational design; Vacancy engineering; Oxygen vacancies
URI
http://oasis.postech.ac.kr/handle/2014.oak/104925
ISSN
2211-2855
Article Type
Article
Citation
Nano Energy, vol. 79, 2021-01
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김원배KIM, WON BAE
Dept. of Chemical Enginrg
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