Universität zu Köln

Han, Hyuksu, Nayak, Arpan Kumar, Choi, Heechae, Ali, Ghulam, Kwon, Jiseok, Choi, Seunggun, Paik, Ungyu and Song, Taeseup (2020). Partial Dehydration in Hydrated Tungsten Oxide Nanoplates Leads to Excellent and Robust Bifunctional Oxygen Reduction and Hydrogen Evolution Reactions in Acidic Media. ACS Sustain. Chem. Eng., 8 (25). S. 9507 - 9519. WASHINGTON: AMER CHEMICAL SOC. ISSN 2168-0485

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Abstract

The development of efficient, low-cost, and stable bifunctional catalysts is necessary for renewable energy storage and conversion, but it remains a challenge. Herein, we first report a novel strategy to develop WO3 center dot nH(2)O (n = 0.33, 1.00, or 2.00) as a highly active and durable bifunctional catalyst for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) in acidic media by controlling the degree of hydration. The content of solvated water molecules in WO3 center dot nH(2)O can be precisely controlled by selectively using ethylenediaminetetraacetic acid or DL-malic acid for room-temperature precipitation synthesis. Structural flexibility associated with water solvation in WO3 center dot nH(2)O leads to excellent bifunctional catalytic activity as well as durability in acidic media. The bifunctional catalytic mechanism of WO3 center dot nH(2)O is mainly attributed to spontaneous partial dehydration during electrolysis, resulting in simultaneous formation of active phases for HER and ORR, respectively.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Han, Hyuksu UNSPECIFIED UNSPECIFIED UNSPECIFIED Nayak, Arpan Kumar UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED UNSPECIFIED UNSPECIFIED Ali, Ghulam UNSPECIFIED UNSPECIFIED UNSPECIFIED Kwon, Jiseok UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Seunggun UNSPECIFIED UNSPECIFIED UNSPECIFIED Paik, Ungyu UNSPECIFIED UNSPECIFIED UNSPECIFIED Song, Taeseup UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-328920
DOI:	10.1021/acssuschemeng.0c02502
Journal or Publication Title:	ACS Sustain. Chem. Eng.
Volume:	8
Number:	25
Page Range:	S. 9507 - 9519
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2168-0485
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FUNCTIONAL ELECTROCATALYST; DUAL-ELECTROCATALYST; EFFICIENT; GRAPHENE; NANOCRYSTALS; NANOPARTICLES; FABRICATION; NANOSHEETS; CATALYSTS; DESIGN Multiple languages Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32892