Chen Pinghua, Wu Yirou, Guo Xuan, Wang Mengxue, Yu Cong, Jiang Hualin, Zhou Weiqiang, Wu Guanghui, Yan Jianan
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
Institute of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Inorg Chem. 2024 Mar 25;63(12):5520-5529. doi: 10.1021/acs.inorgchem.3c04480. Epub 2024 Mar 15.
The rational design of nonnoble-metal-based catalysts with high electroactivity and long-term stability, featuring controllable active sites, remains a significant challenge for achieving effective water electrolysis. Herein, a heterogeneous catalyst with a FeCo-S and NiP heterostructure (denoted FeCo-S/NiP/NF) grown on nickel foam (NF) was synthesized by a solvothermal method and low-temperature phosphorization. The FeCo-S/NiP/NF catalyst shows excellent electrocatalytic performance and stability in alkaline solution. The FeCo-S/NiP/NF catalyst demonstrates low overpotentials (η) for both the hydrogen evolution reaction (HER) (49 mV@10 mA cm) and the oxygen evolution reaction (OER) (279 mV@100 mA cm). Assembling the FeCo-S/NiP/NF catalyst as both cathode and anode in an electrolytic cell for overall water splitting (OWS) needs an ultralow cell voltage of 1.57 V to attain a current density (CD) of 300 mA cm. Furthermore, it demonstrates excellent durability, significantly outperforming the commercial Pt/C∥IrO system. The results of experiments indicate that the heterostructure and synergistic effect of FeCo-S and NiP can significantly enhance conductivity, facilitate mass/ion transport and gas evolution, and expose more active sites, thereby improving the catalytic activity of the electrocatalyst for the OWS. This study provides a rational approach for the development of commercially promising dual-functional electrocatalysts.
设计具有高电活性和长期稳定性、活性位点可控的非贵金属基催化剂，仍然是实现高效水电解的重大挑战。在此，通过溶剂热法和低温磷化合成了一种在泡沫镍（NF）上生长的具有FeCo-S和NiP异质结构的非均相催化剂（表示为FeCo-S/NiP/NF）。FeCo-S/NiP/NF催化剂在碱性溶液中表现出优异的电催化性能和稳定性。FeCo-S/NiP/NF催化剂在析氢反应（HER）（49 mV@10 mA cm）和析氧反应（OER）（279 mV@100 mA cm）中均表现出低过电位（η）。将FeCo-S/NiP/NF催化剂作为阴极和阳极组装在电解槽中进行全水解（OWS），需要1.57 V的超低电池电压才能达到300 mA cm的电流密度（CD）。此外，它还表现出优异的耐久性，明显优于商业Pt/C∥IrO体系。实验结果表明，FeCo-S和NiP的异质结构和协同效应可以显著提高导电性，促进质量/离子传输和气体析出，并暴露更多活性位点，从而提高电催化剂对OWS的催化活性。该研究为开发具有商业前景的双功能电催化剂提供了一种合理的方法。
