journal article·2024-08-05Open access

Insights on Water of Crystallization in Autologous Cobalt Phosphates for Electrocatalytic Water Oxidation

Wei Zhang, Renji Zheng, Ning Han, Wei Guo, Qiong Liu, Zhijie Chen, Yuhai Dou, Xuan Zhang, Jiangshui Luo, Jan Fransaer

ACS Materials Letters· Volume 6· Issue 8

Abstract

Cobalt phosphates are efficient electrocatalysts for the oxygen evolution reaction (OER), the rate-determining step in water splitting. However, the role of water crystallization in OER electrocatalysis is not well understood, limiting the systematic design of such catalysts. This study compares Co 3 (PO 4 ) 2 ·4H 2 O (CoPO-25) and Co 3 (PO 4 ) 2 (CoPO-25NW) nanoflakes to highlight the importance of water of crystallization. The results show that water of crystallization increases the oxygen vacancy concentration, enhances electrical conductivity, and modifies electronic structure, leading to higher catalytic activity for CoPO-25. Additionally, the water of crystallization sustains the structural stability of CoPO-25, preventing complete hydroxylation conversion. Density functional theory calculations reveal that the water of crystallization in CoPO-25 is crucial for modifying binding interactions between reaction intermediates and the catalyst. This study not only presents a promising electrocatalyst but also provides insights into the impact of water crystallization in cobalt phosphates on the OER.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Electrochemical Analysis and Applications

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

Affiliations

Institute of Energy Materials Science, University of Shanghai for Science and Technology, Shanghai 200093, China

Department of Materials Engineering, KU Leuven, Leuven 3001, Belgium

Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

School of Civil and Environmental Engineering, The University of New South Wales, Sydney NSW 2052, Australia

ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 311215, China

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China

Funding

Basic and Applied Basic Research Foundation of Guangdong Province · Natural Science Foundation of Fujian Province · Science, Technology and Innovation Commission of Shenzhen Municipality · Fonds Wetenschappelijk Onderzoek · Science and Technology Department of Sichuan Province · Fonds De La Recherche Scientifique - FNRS · China Scholarship Council · National Natural Science Foundation of China · Hohhot Science and Technology Program

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