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Research Article

Reaction environment self-modification on low-coordination Ni2+ octahedra atomic interface for superior electrocatalytic overall water splitting

Kaian Sun1,2, Lei Zhao1, Lingyou Zeng1, Shoujie Liu2, Houyu Zhu3, Yanpeng Li1, Zheng Chen2, Zewen Zhuang2, Zhaoling Li4, Zhi Liu1, Dongwei Cao3, Jinchong Zhao1, Yunqi Liu1( ), Yuan Pan1( ), Chen Chen2( )
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
Department of Chemistry, Tsinghua University, Beijing 100084, China
College of Science, China University of Petroleum (East China), Qingdao 266580, China
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai 201620, China
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Abstract

Large scale synthesis of high-efficiency bifunctional electrocatalyst based on cost-effective and earth-abundant transition metal for overall water splitting in the alkaline environment is indispensable for renewable energy conversion. In this regard, meticulous design of active sites and probing their catalytic mechanism on both cathode and anode with different reaction environment at molecular- scale are vitally necessary. Herein, a coordination environment inheriting strategy is presented for designing low-coordination Ni2+ octahedra (L-Ni-8) atomic interface at a high concentration (4.6 at.%). Advanced spectroscopic techniques and theoretical calculations reveal that the self-matching electron delocalization and localization state at L-Ni-8 atomic interface enable an ideal reaction environment at both cathode and anode. To improve the efficiency of using the self-modification reaction environment at L-Ni-8, all of the structural features, including high atom economy, mass transfer, and electron transfer, are integrated together from atomic-scale to macro-scale. At high current density of 500 mA/cm2, the samples synthesized at gram-scale can deliver low hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 262 and 348 mV, respectively.

Keywords

atomic interface effectoverall water splittinghigh current densityreaction environment self-modificationdensity functional theory

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Nano Research
Volume 13 Issue 11,
November 2020
Pages 3068-3074
DOI: 10.1007/s12274-020-2974-7
Cite this article:
Sun K, Zhao L, Zeng L, et al. Reaction environment self-modification on low-coordination Ni2+ octahedra atomic interface for superior electrocatalytic overall water splitting. Nano Research, 2020, 13(11): 3068-3074. https://doi.org/10.1007/s12274-020-2974-7
Topics:
AnodesCathodesCoordination reactionsCost effectivenessElectrocatalystsHydrogen evolution reaction Oxygen evolution reactionTransition metals

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Received: 02 March 2020
Revised: 01 June 2020
Accepted: 06 July 2020
Published: 04 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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