A hierarchical nickel-iron hydroxide nanosheet from the high voltage cathodic polarization for alkaline water splitting. (22nd September 2022)

• Record Type: Journal Article
• Authors: Lai, Changgan; Zhou, Huan; Ji, Shuai; Guo, Zhiliang; Sun, Jian; Wang, Helin; Nie, Liu; Zhang, Donghuai; Li, Fajun; Lei, Lixu
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 81(2022)
• Page Start: 34421
• Page End: 34429
• Publication Date: 2022-09-22
• Subjects: High voltage cathodic polarization -- Nickel-iron layered double hydroxides -- Electrocatalysis -- Oxygen evolution reaction -- Overall water splitting; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.08.031
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Developing efficient and stable oxygen evolution reaction (OER) electrocatalysts is a promising method to relieve the pressure of noble metals for catalyzing water splitting. Among the prominent candidates, nickel-iron layered double hydroxides (NiFe-LDH) have been found excellent catalytic activity, but their poor conductivity and stability seriously impede their performance. Herein, we report hierarchical NiFe-LDH nanosheets prepared from NiFe-Alloy on nickel mesh (NM) by high voltage cathodic polarization. The resultant NiFe-LDH/NM exhibits a remarkable OER activity and stability, which has a low overpotential of 340 mV at a current density of 10 mA cm −2, and maintains a current density of 15 mA cm −2 at a constant voltage of 1.56 V for 50 h if the NiFe-Alloy/NM is used as the cathode. The successful conversion of NiFe-LDH nanosheets originating from NiFe-Alloy nanoparticles would open a new avenue for synthesizing transition metal-based LDH compounds. Highlights: A novel strategy was reported to gain NiFe-LDH nanosheets by high voltage cathodic polarization. The unique hierarchical nanosheet structure increases the number of accessible active sites. The NiFe-LDH/NM exhibits excellent OER activity and stability in alkaline water splitting. The assembled water splitting electrolyzer shows satisfactory electrochemical properties.