Tungsten Doped Iron-Nickel Layered Hydroxide for Oxygen Evolution and Hydrogen Evolution Reaction

We utilize a simple one-step hydrothermal synthesis method to introduce trace amount of W6+ into Fe0.02Ni (OH)(2) LDH, which grow on nickel foam in situ. The morphology, composition and structure of W0.03Fe0.2Ni(OH)(2) LDH were characterized by means of field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectra, and so on. W0.03Fe0.2Ni(OH)(2) LDH exhibited better electrochemical performance than others due to W6+ introduction. Electrochemical tests show that the lowest overpotentials for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) at the 25 mA.cm(-2) were only 271 and 208 mV, respectively. The corresponding Tafel slopes were 61 and 181 mV.dec(-1). In addition, there were no obvious decrease of electrocatalytic activity after more than 20-hours of chronopotentiometric test.