Sheng Wenxiang, Zhou Xiaoxing, Ajmal Sara, Chen Xiao, Ma Yuanhang, Chen Ping, Zhu Mangzhou, Li Peng
School of Materials Science and Engineering, Anhui University, Hefei, Anhui 230601, PR China.
Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Ministry of Education, Anhui Province Key Laboratory of Chemistry for In-organic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, PR China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt C):1192-1202. doi: 10.1016/j.jcis.2024.09.142. Epub 2024 Sep 16.
Developing dual-functional electrocatalysts for urea-water decomposition still faces significant challenges. In this study, the vanadium (V) and cerium (Ce) co-doped FeCoNi medium-entropy phosphide (VCe-FeCoNiP/NF) were effectively fabricated on nickel foam (NF) via "two-step method," which involved hydrothermal treatment followed by phosphorization. Experimental results indicate that, benefiting from dual-ion doping and medium-entropy configuration, VCe-FeCoNiP/NF demonstrates unique electronic effects among the multimetallic elements, thereby exhibited remarkable catalytic activity for both urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). Under urea-water conditions (1 M KOH with 0.33 M urea), the VCe-FeCoNi/NF catalyst merely required 1.338 V (vs RHE) and an overpotential of 173 mV to attain a current density of 100 mA·cm for UOR and HER, respectively. Moreover, it could stably operate at a current density of 20 mA·cm for 225 h in overall urea-water decomposition. This work provides new insights for designing high-performance urea-water electrolysis catalysts.
开发用于尿素-水分解的双功能电催化剂仍然面临重大挑战。在本研究中，通过“两步法”在泡沫镍（NF）上有效制备了钒（V）和铈（Ce）共掺杂的FeCoNi中熵磷化物（VCe-FeCoNiP/NF），该方法包括水热处理后进行磷化处理。实验结果表明，得益于双离子掺杂和中熵构型，VCe-FeCoNiP/NF在多金属元素中表现出独特的电子效应，从而对尿素氧化反应（UOR）和析氢反应（HER）均表现出显著的催化活性。在尿素-水条件下（1 M KOH含0.33 M尿素），VCe-FeCoNi/NF催化剂在UOR和HER中分别仅需1.338 V（相对于可逆氢电极）和173 mV的过电位即可达到100 mA·cm的电流密度。此外，在整体尿素-水分解中，它可以在20 mA·cm的电流密度下稳定运行225小时。这项工作为设计高性能尿素-水电解催化剂提供了新的见解。
