用于电化学水氧化的铁、镍、钴金属及其二元金属纳米颗粒比较研究（英文）

发布时间：2018-01-09 00:06

本文关键词：用于电化学水氧化的铁、镍、钴金属及其二元金属纳米颗粒比较研究（英文）　出处：《电化学》2017年02期 　论文类型：期刊论文

【摘要】：从环境兼容角度来设计应用于氧析出反应的电催化剂是否有效、耐用和廉价对能源转化过程至关重要.本文报告了一种快速制备低成本、原料丰富的金属催化剂制备方法.通过一步电化学沉积法在钛金属基材上制备了铁、镍、钴金属及其钴镍、钴铁二元金属纳米颗粒.采用场发射电子显微镜(FE-SEM)、能量散射X-射线能谱(EDX)、X-射线衍射光谱(XRD)、X-射线光电子能谱(XPS)和电化学技术对制备的不同纳米颗粒进行了表征.电化学结果显示,在合成的五种钛基金属纳米催化剂中,钛基上沉积钴金属纳米颗粒(Ti/Co)电极在0.l mol·L~(-1)氢氧化钾溶液中氧析出反应的电催化活性最好,0.70 V(相对于银/氯化银电极)的电流密度为10.0 mA·cm~(-2).经优化后Ti/Co电极的过电位(η)很小,当电流密度为10.0 mA·cm~(-2)时η为0.43 V,质量活性高达105.7 A·g~(-1),逆转频率(TOF)值为1.63×10~(-3) s~(-1),这些与当前最好的碳载铂(Pt/C)和氧化钌(RuO_2)电催化剂的性能相当.此外,通过计时电位技术对优化后Ti/Co电极的耐久性进行了测试,发现该电极在碱性溶液中氧析出反应的稳定性良好.本工作制备的钛金属基材上电化学沉积金属钴纳米颗粒具有高催化活性、高稳定性、原料来源丰富、廉价且易于大规模生产,在工业化水分解领域具有潜在的应用前景.
[Abstract]:It is very important for the energy conversion process to design the electrocatalysts for oxygen precipitation reaction from the point of view of environmental compatibility. In this paper, we report a rapid preparation with low cost. The preparation method of metal catalyst with abundant raw materials. Iron, nickel, cobalt metal and cobalt nickel were prepared on titanium metal substrate by one step electrochemical deposition method. Co-Fe binary metal nanoparticles. Field emission electron microscopy (FE-SEMN), energy dispersive X-ray spectroscopy (EDXX) and X-ray diffraction (XRD). X- ray photoelectron spectroscopy (XPS) and electrochemical techniques were used to characterize the prepared nanoparticles. The electrochemical results showed that there were five titanium based metal nanocatalysts. The Ti / Co electrode with cobalt metal nanoparticles deposited on titanium substrate has the best electrocatalytic activity for oxygen precipitation in 0.1 mol 路L ~ (-1) potassium hydroxide solution. The current density of 0.70V (relative to silver / silver chloride electrode) is 10.0 Ma 路cm ~ (-1) ~ (-2). The overpotential (畏) of optimized Ti/Co electrode is very small. When the current density is 10.0 Ma 路cm ~ (-2), 畏 is 0.43 V, and the mass activity is 105.7 A 路g ~ (-1)). The reversal frequency (TOF) value was 1.63 脳 10 ~ (-3) ~ (-1) 路s ~ (-1). The properties of these catalysts are comparable to those of the best carbon-supported Pt / C and ruthenium oxide Ruo _ 2) electrocatalysts. In addition, the durability of the optimized Ti/Co electrode was tested by chronopotentiometry. It is found that the electrode has good stability in the oxygen precipitation reaction in alkaline solution. The electrochemical deposition of cobalt nanoparticles on the titanium substrate prepared in this work has high catalytic activity, high stability and abundant raw materials. It is cheap and easy to be produced in large scale, so it has a potential application in the field of industrial water decomposition.
【作者单位】：加拿大湖首大学化学系;
【基金】：supported by the Discovery Grant from the Natural Sciences and Engineering Research Council of Canada(NSERC RGPIN-2015-06248) the Canada Foundation for Innovation(CFI) for the Canada Research Chair Award in Materials and Environmental Chemistry
【分类号】：O643.36;TB383.1
【正文快照】： The development of a technology that has theconstrains the efficiency of water splitting devices[7-9].capacity to efficiently generate hydrogen from waterRobust and highly active electrocatalysts are thus re-would provide a new renewable,sustainable,andq

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