School of Materials and Energy, Yunnan University, Kunming 650091, PR China.
School of Engineering, The University of Edinburgh, South Bridge, Edinburgh EH8 9YL, UK.
J Colloid Interface Sci. 2023 Mar;633:897-906. doi: 10.1016/j.jcis.2022.12.002. Epub 2022 Dec 5.
Electrocatalytic water splitting to generate high-quality hydrogen is an attractive renewable energy storage technology; however, it is still far from becoming a real-world application. In this study, we developed an effective and stable nickel foam-supported FeP@CoMnP heterostructure electrocatalyst for overall water splitting. As expected, the as-obtained FeP@CoMnP/NF electrocatalyst exhibits superb bifunctional catalytic activity and only requires extremely low overpotentials of 53 and 249 mV to achieve a current density of 10 mA cm for the hydrogen and oxygen evolution reactions, respectively. Moreover, a two-electrode electrolyzer assembled using FeP@CoMnP/NF as electrodes operates at the low cell voltage of 1.54 V at 10 mA cm, showing excellent long-term stability for 140 h. Theoretical calculations indicate that the surface electronic structure is effectively adjusted by the generated heterointerfaces between the FeP and CoMnP in a two-phase matrix, resulting in a Gibbs free energy of hydrogen adsorption close to zero and high intrinsic activity. This innovative strategy is a valuable route for producing low-cost high-performance bifunctional electrocatalysts for water splitting.
电催化水分解生成高质量氢气是一种有吸引力的可再生能源储存技术；然而，它离实际应用还很远。在这项研究中，我们开发了一种高效稳定的镍泡沫负载 FeP@CoMnP 异质结构电催化剂，用于全水分解。正如预期的那样，所获得的 FeP@CoMnP/NF 电催化剂表现出优异的双功能催化活性，仅需 53 和 249 mV 的超低过电势即可实现 10 mA cm 的电流密度用于析氢和析氧反应。此外，使用 FeP@CoMnP/NF 作为电极组装的两电极电解槽在 10 mA cm 的低电池电压下工作，在 140 小时内表现出优异的长期稳定性。理论计算表明，在两相基体中产生的 FeP 和 CoMnP 之间的异质界面有效地调节了表面电子结构，导致氢吸附的吉布斯自由能接近零和高本征活性。这种创新策略为生产低成本高性能的双功能水电解催化剂提供了一条有价值的途径。
