Heterogeneous layered multiple transition metal composite electrocatalysts with controlled composition for hydrogen production. (15th January 2023)

• Record Type: Journal Article
• Authors: Ye, Feng; Ma, Xiaofeng; Cao, Yanpeng; Yang, Yakun; Zhang, Tianying; Wang, Kaichen; Feng, Yuancheng; La, Ta; Xu, Chao
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 5(2023)
• Page Start: 1733
• Page End: 1746
• Publication Date: 2023-01-15
• Subjects: Heterogeneous layered structure -- Superhydrophilic surface -- Bifunctional electrocatalyst -- Alkaline -- Overall water splitting; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.10.065
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The exploration of highly efficient and low-cost bifunctional electrocatalyst is essential for overall water splitting, especially for industrial application under alkaline conditions. Herein, we propose a controllable structural engineering strategy of constructing heterogeneous layered electrocatalyst with wetting surface for hydrogen evolution reaction and oxygen evolution reaction. Heterogeneous layered NiFe LDH (layered double hydroxide)/CoFeP/NF (Ni foam) with superhydrophilic surfaces is successfully fabricated by successive electrodeposition, phosphorization and solvothermal method. The NiFe LDH/CoFeP/NF for hydrogen evolution achieves a low overpotential of 198 mV at 50 mA cm −2 in 1.0 M KOH. An overpotential of 269 mV is required at 50 mA cm −2 for oxygen evolution. Meanwhile, the practical utilization of NiFe LDH/CoFeP/NF as bifunctional electrocatalysts for overall water splitting yields 1.73 V at 50 mA cm −2 in the two-electrode cell. Moreover, NiFe LDH/CoFeP/NF can retain over 50 h without an obvious degradation at 10 mA cm −2 . The satisfactory operating stability and high activity of NiFe LDH/CoFeP/NF in alkaline solution can be attributed to the heterogeneous layered structure and excellent hydrophilic surface. The study provides a strategy to engineering heterogeneous layered structures with wetting surface for excellent electrocatalytic activities toward overall water splitting. Graphical abstract: Based on the unique heterogeneous layered structure and superhydrophilic surface, NiFe LDH/CoFeP/NF exhibits excellent catalytic performance and good stability for both hydrogen evolution reaction and oxygen evolution reaction in 1.0 M KOH alkaline solution. Image 1 Highlights: NiFe LDH/CoFeP/NF requires a cell voltage of 1.73 V at high 50 mA cm −2 . NiFe LDH/CoFeP/NF can retain over 50 h without an obvious decay at 10 mA cm −2 . The heterogeneous layered structure reduces the charge transfer resistance. The superhydrophilic properties enable electrolyte-electrode contact and reaction.