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Title: Energy level engineering in transition-metal doped spinel-structured nanosheets for efficient overall water splitting
Authors: Lai, Feili
Feng, Jianrui
Ye, Xiaobin
Zong, Wei
He, Guanjie
Miao, Yue-E
Han, Xuemei
Ling, Xing Yi
Parkin, Ivan P.
Pan, Bicai
Sun, Yongfu
Liu, Tianxi
Keywords: Science::Chemistry
Issue Date: 2019
Source: Lai, F., Feng, J., Ye, X., Zong, W., He, G., Miao, Y., Han, X., Ling, X. Y., Parkin, I. P., Pan, B., Sun, Y. & Liu, T. (2019). Energy level engineering in transition-metal doped spinel-structured nanosheets for efficient overall water splitting. Journal of Materials Chemistry A, 7(2), 827-833.
Journal: Journal of Materials Chemistry A
Abstract: Unraveling the role of transition-metal doping in affecting the native spinel-structured nanosheets' water splitting remains a grand challenge. In this work, a series of spinel-structured nanosheets wrapped hollow nitrogen-doped carbon polyhedrons were constructed, and doped transition-metal domains were deliberately introduced on the surface. Theoretical investigations show that their energy level can be finely tuned via direct transition-metal doping engineering. As a prototype, an Fe-doped NiCo₂O₄ nanosheets wrapped hollow nitrogen-doped carbon polyhedron (Fe–NiCo₂O₄@HNCP) exhibits outstanding bifunctional electrocatalytic performances with low overpotentials (η = 270 mV for OER, η = 84 mV for HER), low Tafel slopes (b = 42 mV dec⁻¹ for OER, b = 47 mV dec⁻¹ for HER), and high durability. The enhanced performance is attributed to the synergistic effects of energy level matching for electron transfer, and partial charge delocalization-induced rich active sites for reactant adsorption via thermodynamic and kinetic acceleration. This work may open a new pathway to design highly active and stable transition-metal doped electrocatalysts by manipulated energy levels for efficient overall water splitting.
ISSN: 2050-7488
DOI: 10.1039/C8TA10162K
Rights: © 2019 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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