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Title: Breaking the symmetry : gradient in NiFe layered double hydroxide nanoarrays for efficient oxygen evolution
Authors: Zhou, Daojin
Jia, Yin
Duan, Xinxuan
Tang, Jialun
Xu, Jie
Liu, Dong
Xiong, Xuya
Zhang, Junming
Luo, Jun
Zheng, Lirong
Liu, Bin
Kuang, Yun
Sun, Xiaoming
Duan, Xue
Keywords: Engineering::Chemical engineering
Issue Date: 2019
Source: Zhou, D., Jia, Y., Duan, X., Tang, J., Xu, J., Liu, D., Xiong, X., Zhang, J., Luo, J., Zheng, L., Liu, B., Kuang, Y., Sun, X. & Duan, X. (2019). Breaking the symmetry : gradient in NiFe layered double hydroxide nanoarrays for efficient oxygen evolution. Nano Energy, 60, 661-666.
Project: RG10/16
Journal: Nano Energy
Abstract: Breaking the symmetry in catalysts through interface engineering has emerged as a new dimension in enhancing the catalytic performances, while the long-range asymmetry (i.e. in nanometer scale) in catalysts can hardly be achieved by alloying or doping. Herein, we introduce asymmetrical gradient effect into NiFe layered double hydroxide (NiFe-LDH) at nano scale via a simple nanoarray construction strategy on Ni foam substrate. The electron energy loss spectroscopy, extended X-Ray absorption fine structure and other characterizations together revealed the concentration and valence states gradients in NiFe-LDH nanoarrays. Subsequently, the gradient effect leads to distinctly optimized binding strength of active sites to oxygen evolution intermediates, better electron transfers and boosted oxygen evolution performances, which are absent in non-gradient NiFe-LDH catalysts. Such long-range gradient effects in nanoarray materials provide new opportunities to understand their boosted catalytic performances and to rationally design better catalytic materials.
ISSN: 2211-2855
DOI: 10.1016/j.nanoen.2019.04.014
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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