Wei Zhang, Renji Zheng, Ning Han*, Wei Guo, Qiong Liu, Zhijie Chen, Yuhai Dou, Xuan Zhang*, Jiangshui Luo* and Jan Fransaer*,
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引用次数: 0
摘要
磷酸钴是氧进化反应（OER）的高效电催化剂，而氧进化反应是水分离过程中决定速率的一步。然而，人们对水结晶在 OER 电催化中的作用还不甚了解，从而限制了此类催化剂的系统设计。本研究比较了 Co3(PO4)2-4H2O （CoPO-25）和 Co3(PO4)2 （CoPO-25NW）纳米片，以突出结晶水的重要性。结果表明，结晶水增加了氧空位浓度，提高了导电性，改变了电子结构，从而提高了 CoPO-25 的催化活性。此外，结晶水还能维持 CoPO-25 的结构稳定性，防止其完全羟化转化。密度泛函理论计算显示，CoPO-25 中的结晶水对于改变反应中间产物与催化剂之间的结合相互作用至关重要。这项研究不仅展示了一种前景广阔的电催化剂，还深入探讨了磷酸钴中的结晶水对 OER 的影响。
Insights on Water of Crystallization in Autologous Cobalt Phosphates for Electrocatalytic Water Oxidation
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 Co3(PO4)2·4H2O (CoPO-25) and Co3(PO4)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.
期刊介绍：
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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