Universität zu Köln

Xia, Chengkai, Li, Yuankai, Je, Minyeong, Kim, Jaekyum, Cho, Sung Min, Choi, Chang Hyuck, Choi, Heechae ORCID: 0000-0002-9390-6607, Kim, Tae-Hoon and Kim, Jung Kyu ORCID: 0000-0002-8218-0062 (2022). Nanocrystalline Iron Pyrophosphate-Regulated Amorphous Phosphate Overlayer for Enhancing Solar Water Oxidation. Nano-Micro Lett., 14 (1). SHANGHAI: SHANGHAI JIAO TONG UNIV PRESS. ISSN 2150-5551

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Abstract

A rational regulation of the solar water splitting reaction pathway by adjusting the surface composition and phase structure of catalysts is a substantial approach to ameliorate the sluggish reaction kinetics and improve the energy conversion efficiency. In this study, we demonstrate a nanocrystalline iron pyrophosphate (Fe-4(P2O7)(3), FePy)-regulated hybrid overlayer with amorphous iron phosphate (FePO4, FePi) on the surface of metal oxide nanostructure with boosted photoelectrochemical (PEC) water oxidation. By manipulating the facile electrochemical surface treatment followed by the phosphating process, nanocrystalline FePy is localized in the FePi amorphous overlayer to form a heterogeneous hybrid structure. The FePy-regulated hybrid overlayer (FePy@FePi) results in significantly enhanced PEC performance with long-term durability. Compared with the homogeneous FePi amorphous overlayer, FePy@FePi can improve the charge transfer efficiency more significantly, from 60% of FePi to 79% of FePy@FePi. Our density-functional theory calculations reveal that the coexistence of FePi and FePy phases on the surface of metal oxide results in much better oxygen evolution reaction kinetics, where the FePi was found to have a typical down-hill reaction for the conversion from OH* to O-2, while FePy has a low free energy for the formation of OH*.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Xia, Chengkai UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Yuankai UNSPECIFIED UNSPECIFIED UNSPECIFIED Je, Minyeong UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Jaekyum UNSPECIFIED UNSPECIFIED UNSPECIFIED Cho, Sung Min UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Chang Hyuck UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Kim, Tae-Hoon UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Jung Kyu UNSPECIFIED orcid.org/0000-0002-8218-0062 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-678965
DOI:	10.1007/s40820-022-00955-w
Journal or Publication Title:	Nano-Micro Lett.
Volume:	14
Number:	1
Date:	2022
Publisher:	SHANGHAI JIAO TONG UNIV PRESS
Place of Publication:	SHANGHAI
ISSN:	2150-5551
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SURFACE; EFFICIENT; FILM Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67896