Universität zu Köln

Li, Yuankai ORCID: 0000-0002-1883-1502, Je, Minyeong, Kim, Jaekyum, Xia, Chengkai, Roh, Seung Hun, So, Won, Lee, Hanleem, Kim, Dong-Hwan, Cho, Sung Min, Bae, Jong Wook, Choi, Heechae ORCID: 0000-0002-9390-6607 and Kim, Jung Kyu ORCID: 0000-0002-8218-0062 (2022). Rational nanopositioning of homogeneous amorphous phase on crystalline tungsten oxide for boosting solar water oxidation. Chem. Eng. J., 438. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 1873-3212

Full text not available from this repository.

Abstract

Surface defect engineering of metal oxide is a promising approach for efficient photoelectrochemical (PEC) water splitting. However, the role of an amorphous overlayer with disordered crystallinity is debated, as it can induce crucial charge traps and undesired charge recombination. Herein, we demonstrate a rationally designed nano positioning of a homogenous amorphous phase on the surface of crystalline metal oxide via a facile surface defect engineering to strongly enhance photoelectrochemical (PEC) water oxidation. The nanopositioning of the localized amorphous phase generates crystalline-amorphous (CA) homogeneous boundaries on the crystalline metal oxide. The amorphous phase provides the increased active adsorption sites, while the exposed crystalline phase promotes the charge transport. The results of analysis conducted on the rationally designed model case of crystalline-amorphous tungsten oxide (CA-WO3) photoanode confirm a 2.5-fold higher photocurrent density (3.34 mA cm(-2)) at 1.23 V versus reversible hydrogen electrode under 1 sun illumination compared with the bare crystalline WO3 (1.35 mA cm(-2)). With the rationally designed surface defects, we achieve the high-efficiency charge separation and catalytic kinetics. This work provides guidance for the rational design of surface defects on crystalline metal oxides for boosting the PEC water splitting.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Li, Yuankai UNSPECIFIED orcid.org/0000-0002-1883-1502 UNSPECIFIED Je, Minyeong UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Jaekyum UNSPECIFIED UNSPECIFIED UNSPECIFIED Xia, Chengkai UNSPECIFIED UNSPECIFIED UNSPECIFIED Roh, Seung Hun UNSPECIFIED UNSPECIFIED UNSPECIFIED So, Won UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Hanleem UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Dong-Hwan UNSPECIFIED UNSPECIFIED UNSPECIFIED Cho, Sung Min UNSPECIFIED UNSPECIFIED UNSPECIFIED Bae, Jong Wook UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Kim, Jung Kyu UNSPECIFIED orcid.org/0000-0002-8218-0062 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-673203
DOI:	10.1016/j.cej.2022.135532
Journal or Publication Title:	Chem. Eng. J.
Volume:	438
Date:	2022
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	1873-3212
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GENERALIZED GRADIENT APPROXIMATION; OXYGEN VACANCY; BAND-GAP; HYDROGEN; METAL; NANOPARTICLES; GENERATION; EFFICIENCY; MECHANISM; SURFACES Multiple languages Engineering, Environmental; Engineering, Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67320