钨掺杂的铁镍基层状氢氧化物用于电催化析氧和析氢反应

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

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Fe0.2Ni(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,W0.03Fe0.2Ni(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。

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 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.