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Lee, Jun Hee
Quantum Materials for Energy Conversion Lab.
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A catalyst design for selective electrochemical reactions: direct production of hydrogen peroxide in advanced electrochemical oxidation

Author(s)
Ko, Young-JinChoi, KeunsuYang, BoramLee, Woong HeeKim, Jun-YongChoi, Jae WooChae, Keun HwaLee, Jun HeeHwang, Yun JeongMin, Byoung KounOh, Hyung-SukLee, Wook-Seong
Issued Date
2020-05
DOI
10.1039/d0ta01869d
URI
https://scholarworks.unist.ac.kr/handle/201301/33016
Fulltext
https://pubs.rsc.org/en/content/articlelanding/2020/TA/D0TA01869D#!divAbstract
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.19, pp.9859 - 9870
Abstract
Hydrogen peroxide production by enhanced electrocatalysts is an attractive alternative to the present commercial process. While the subnano/atomic dispersion in noble metal nanocatalysts is known to strongly enhance their catalytic efficiency and chemoselectivity, their excessive surface energy and consequent coarsening seriously compromise their physical/chemical stability. Here, we report a subnano/atomically dispersed Pt-Ag alloy (by a simply modified polyol process) that is resistant to agglomeration/Ostwald ripening. This catalyst does not follow a conventional four-electron oxygen reduction reaction (ORR) but selectively produces H2O2 without excessive degradation of its activity. We clarified the role of the alloying element, Ag, as follows: (1) selective activation of two-electron ORR by inhibiting O-2 dissociation and (2) suppression of H2O2 decomposition by preventing the H2O2 adsorption. The present approach provides a convenient route for the direct generation of H2O2 as a simple byproduct of electricity generation by fuel-cell systems.
Publisher
ROYAL SOC CHEMISTRY
ISSN
2050-7488
Keyword
OXYGEN REDUCTION REACTIONWATER-GAS SHIFTELECTRO-FENTONCO OXIDATIONDOPED CARBONSINGLEPLATINUMH2O2ATOMDEGRADATION

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