NiMn1.5PO4 thin layer supported on Ni foam as a highly efficient bifunctional electrocatalyst for overall water splitting. (20th January 2021)

• Record Type: Journal Article
• Authors: Zhang, Guanghui; Ge, Huaiyun; Zhao, Lingxue; Liu, Jianyu; Wang, Fengbo; Fan, Siwei; Li, Guangda
• Is Part Of: Electrochimica acta. Volume 367(2021)
• Publication Date: 2021-01-20
• Subjects: Overall water splitting -- Electrocatalysis -- Metal phosphate -- HER -- Ni foam; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.137567
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: This work presents a NiMn1.5 PO4 /NF composite bifunctional electrocatalyst. NiMn1.5 PO4 /NF exhibites an excellent electrocatalytic activity toward HER and OER. The overpotentials were 72 mV and 198 mV at 10 mA cm −2 for HER and OER process. A low cell voltage of 1.48 V was achieved at current density of 10 mA cm −2 . Abstract: In this work, we used Ni foam (NF) as a substrate to grow NiMn1.5 PO4 thin layers on the surface of NF by a facile method. The NiMn1.5 PO4 thin layer uniformly grows and covers on the surface of NF, thus form a three dimensional (3D) network structure. The 3D structure has a large specific surface area and a porous framework structure, which exhibited very low overpotentials and highly efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The overpotentials of the NiMn1.5 PO4 /NF catalysts were 72 mV and 198 mV at 10 mA cm −2 for HER and OER process, respectively. When NiMn1.5 PO4 /NF was used as both anode and cathode electrocatalyst in 1 M KOH, a low cell voltage of 1.48 V was achieved at current density of 10 mA cm −2 and showed a good long-term stability for 50 h. In the process of overall water splitting, the H2 yield can be reached 4.17 μmol min −1 .