The pursuit of cost-effective and efficient electrocatalysts for water oxidation is crucial for various applications for the storage and conversion of electrochemical energy. Coordination polymers (CPs) have garnered significant interest as potential electrocatalysts, as their catalytic efficiency can be precisely tuned through the design of coordination layers that boast highly accessible and highly reactive metal sites. However, CP-based catalysts face substantial challenges for their application in electrocatalytic oxidation processes because of their limited activity and poor stability. In this study, we employed a mixed-metal approach to develop CoxNi1-x-PDAs incorporating two functional sites specifically designed for facilitating the oxidation of water. The presence of both Co and Ni enhances electron transport through synergistic effects within the CoxNi1-x-PDAs structure. By adjusting the metal ratios in these coordination polymers, an optimized Co3/4Ni1/4-PDA demonstrated impressive performance in water oxidation under alkaline conditions during oxygen evolution reactions, a current density of 10 mA cm−2 was achieved with an overpotential of 322 mV, along with a Tafel slope measured at 87 mV dec−1. This approach involving mixed metals seeks to exploit the synergistic effects among various metal centers, which could result in efficient electrocatalysts for the oxidation of small molecules. Our findings present a promising avenue for utilizing CPs materials within the realm of electrocatalysis.

中文翻译：

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由吡嗪二羧酸合成的双金属配位聚合物用作增强析氧反应的高效电催化剂


追求经济高效且高效的水氧化电催化剂对于电化学能量的储存和转换的各种应用至关重要。配位聚合物 （CP） 作为潜在的电催化剂引起了人们的极大兴趣，因为它们的催化效率可以通过拥有高度可接近和高反应性金属位点的配位层的设计来精确调节。然而，由于 CP 基催化剂的活性有限且稳定性差，其在电催化氧化工艺中的应用面临巨大挑战。在这项研究中，我们采用混合金属方法来开发 CoxNi1-x-PDA，其中包含两个专门用于促进水氧化的功能位点。Co 和 Ni 的存在通过 CoxNi1-x-PDAs 结构内的协同效应增强了电子传输。通过调整这些配位聚合物中的金属比例，优化的 Co3/4Ni1/4-PDA 在析氧反应过程中碱性条件下的水氧化中表现出令人印象深刻的性能，实现了 10 mA cm-2 的电流密度和 322 mV 的过电位，以及 87 mV dec-1 的塔菲尔斜率测量。这种涉及混合金属的方法旨在利用各种金属中心之间的协同效应，从而产生用于小分子氧化的高效电催化剂。我们的研究结果为在电催化领域利用 CPs 材料提供了一条有前途的途径。