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Type: Journal article
Title: In situ grown epitaxial heterojunction exhibits high-performance electrocatalytic water splitting
Author: Zhu, C.
Wang, A.L.
Xiao, W.
Chao, D.
Zhang, X.
Tiep, N.H.
Chen, S.
Kang, J.
Wang, X.
Ding, J.
Wang, J.
Zhang, H.
Fan, H.J.
Citation: Advanced Materials, 2018; 30(13):1705516-1-1705516-8
Publisher: Wiley
Issue Date: 2018
ISSN: 0935-9648
Statement of
Changrong Zhu, An-Liang Wang, Wen Xiao, Dongliang Chao, Xiao Zhang, Nguyen Huy Tiep, Shi Chen, Jiani Kang, Xin Wang, Jun Ding, John Wang, Hua Zhang, and Hong Jin Fan
Abstract: Electrocatalytic performance can be enhanced by engineering a purposely designed nanoheterojunction and fine-tuning the interface electronic structure. Herein a new approach of developing atomic epitaxial in-growth in Co-Ni₃N nanowires array is devised, where a nanoconfinement effect is reinforced at the interface. The Co-Ni₃N heterostructure array is formed by thermal annealing NiCo₂O₄ precursor nanowires under an optimized condition, during which the nanowire morphology is retained. The epitaxial in-growth structure of Co-Ni₃N at nanometer scale facilitates the electron transfer between the two different domains at the epitaxial interface, leading to a significant enhancement in catalytic activities for both hydrogen and oxygen evolution reactions (10 and 16 times higher in the respective turnover frequency compared to Ni₃N-alone nanorods). The interface transfer effect is verified by electronic binding energy shift and density functional theory (DFT) calculations. This nanoconfinement effect occurring during in situ atomic epitaxial in-growth of the two compatible materials shows an effective pathway toward high-performance electrocatalysis and energy storages.
Keywords: Epitaxial in-growth; hydrogen evolution reaction; metal nitride arrays; nanoconfinement; oxygen evolution reaction
Description: Published online: February 13, 2018
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/adma.201705516
Grant ID: NRF-CRP16-2015-01
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