Vertical Nickel–Iron layered double hydroxide nanosheets grown on hills-like nickel framework for efficient water oxidation and splitting |
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| Affiliation: | 1. Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, PR China;2. College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, 150001, PR China;1. Faculity of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology, Tehran 15875-1774, Iran;2. Department of Applied Chemistry, Malek-Ashtar University of Technology, Isfahan 83145-115, Iran;1. Fuel Cell and Battery Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700032, India;2. Powder Metallurgy Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India;3. Academia of Scientific and Innovative Research (AcSIR), Gaziabad-201002, India;1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | Herein, the vertical thin nickel–iron layered double hydroxide nanosheets grown on the hills-like nickel framework (NiFe LDH/Ni@NF) are employed for the oxygen evolution reaction (OER), securing at the low overpotentials of 197 and 270 mV to obtain the current densities of 20 and 100 mA cm?2, respectively, with a Tafel slope of 73.34 mV dec?1. The electrodeposited nickel film induces the NiFe LDH nanosheets grow vertically and thinly. As well, the nickel abundant interfaces and inner space makes this catalyst effective for OER. It was further served as the OER electrode in a water splitting system coupled the Pt/C cathode, and a cell voltage was at 1.52 and 1.67 V to achieve the current density of 10 mA cm?2 and 50 mA cm?2. In addition, the water electrolyzer can suffer a long time of 24 h at 50 mA cm?2, showing the feasibility in a practical unbiased alkaline water splitting system. |
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| Keywords: | Oxygen evolution reaction Vertical nanosheets Water splitting Hydrogen |
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