journal article·2018-06-08

Nickel Vacancies Boost Reconstruction in Nickel Hydroxide Electrocatalyst

Qun He, Yangyang Wan, Hongliang Jiang, Ziwen Pan, Chuanqiang Wu, Mei Wang, Xiaojun Wu, Bangjiao Ye, Pulickel M. Ajayan, Li Song

ACS Energy Letters· Volume 3· Issue 6
Publisher page

Abstract

Because the reconstruction of catalysts is generally observed during oxidation reactions, understanding the intrinsic structure-related reconstruction ability of electrocatalysts is highly desirable but challenging. Herein, a controllable hydrolysis strategy is developed to obtain nickel hydroxide electrocatalysts with controllable nickel vacancy (VNi) concentrations, as confirmed by advanced spectroscopic characterization. Electrochemical measurements show that the reconstruction can be promoted with the increase of VNi concentration to generate true active components, thereby boosting activities for both oxygen evolution reaction (OER) and urea oxidation reaction (UOR). Density functional theory calculations confirm that the increased VNi concentration yields decreased formation energies of the true active components during reactions. This work provides fundamental understanding of the reconstruction ability of electrocatalysts in anodic oxidation reactions from the view of intrinsic defects.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230029, PR China

Hefei National Laboratory for Physical Science at the Microscale, Synergetic Innovation of Quantum Information & Quantum Technology, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, PR China

State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, PR China

Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Chinese Academy of Sciences · Key Laboratory of Advanced Energy Materials Chemistry, Nankai University

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