【摘要】 采用简便的一步水热合成法,在泡沫镍上原位生长微量W⁶⁺掺入的Fe_0.2Ni（OH）₂双金属层状氢氧化物（LDH）,以此来降低铁镍材料的过电势。通过场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和拉曼光谱（Raman）等分析方法对材料形貌、组成、结构等进行表征,发现钨掺杂使催化剂材料的晶体结构和电子结构发生变化,W_0.03Fe_0.2Ni（OH）₂LDH表现出优异的电化学析氧（OER）和析氢（HER）性能。电化学测试表明该催化剂在25 mA·cm^-2电流密度下OER和HER过电势分别仅有271和208 mV,塔菲尔斜率分别为61和181 mV·dec^-1。此外,经过长达20 h计时电位稳定性测试后,材料的催化性能未见明显下降。更多还原

【Abstract】 We utilize a simple one-step hydrothermal synthesis method to introduce trace amount of W⁶⁺into Fe_0.02Ni（OH）₂ LDH, which grow on nickel foam in situ. The morphology, composition and structure of W_0.03Fe_0.2Ni（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. W_0.03Fe_0.2Ni（OH）₂ LDH exhibited better electro-chemical 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 obvi-ous decrease of electrocatalytic activity after more than 20-hours of chronopotentiometric test.更多还原