journal article·2024-02-13

Layered Quasi-Nevskite Metastable-Phase Cobalt Oxide Accelerates Alkaline Oxygen Evolution Reaction Kinetics

Zhenglong Fan, Qintao Sun, Hao Yang, Wenxiang Zhu, Fan Liao, Qi Shao, Tianyang Zhang, Hui Huang, Tao Cheng, Yang Liu, Mingwang Shao, Minhua Shao, Zhenhui Kang

ACS Nano· Volume 18· Issue 6
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Abstract

Clarifying the structure–reactivity relationship of non-noble-metal electrocatalysts is one of the decisive factors for the practical application of water electrolysis. In this field, the anodic oxygen evolution reaction (OER) with a sluggish kinetic process has become a huge challenge for large-scale production of high-purity hydrogen. Here we synthesize a layered quasi-nevskite metastable-phase cobalt oxide (LQNMP-Co 2 O 3 ) nanosheet via a simple molten alkali synthesis strategy. The unit-cell parameters of LQNMP-Co 2 O 3 are determined to be a = b = 2.81 Å and c = 6.89 Å with a space group of P 3̅ m 1 (No. 164). The electrochemical results show that the LQNMP-Co 2 O 3 electrocatalyst enables delivering an ultralow overpotential of 266 mV at a current density of 10 mA cm geo –2 with excellent durability. The operando XANES and EXAFS analyses clearly reveal the origin of the OER activity and the electrochemical stability of the LQNMP-Co 2 O 3 electrocatalyst. Density functional theory (DFT) simulations show that the energy barrier of the rate-determining step (RDS) (from *O to *OOH) is significantly reduced on the LQNMP-Co 2 O 3 electrocatalyst by comparing with simulated monolayered CoO 2 (M-CoO 2 ).
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Catalytic Processes in Materials Science

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

Affiliations

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, Jiangsu, People’s Republic of China

Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Kowloon 999077, Hong Kong, People’s Republic of China

Energy Institute, The Hong Kong University of Science and Technology, Kowloon 999077, Hong Kong, People’s Republic of China

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, People’s Republic of China

Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Macau University of Science and Technology, Taipa 999078, Macao, People’s Republic of China

Funding

Suzhou Key Laboratory of Functional Nano and Soft Materials · Collaborative Innovation Center of Suzhou Nano Science and Technology · National Key Research and Development Program of China · Ministry of Education of the People's Republic of China · China Postdoctoral Science Foundation · Natural Science Foundation of Jiangsu Province · Innovation and Technology Commission · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · Key-Area Research and Development Program of GuangDong Province · ?Hong Kong Scholar? fund

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