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首页> 外文期刊>International Journal of Electrochemical Science >Study of Carbon Black, Nitrogen and Sulphur Codoped Graphite and Graphene-Like Sheets Supported NiCo Alloy Catalyst for Hydrazine Electrooxidation in Alkaline Media
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Study of Carbon Black, Nitrogen and Sulphur Codoped Graphite and Graphene-Like Sheets Supported NiCo Alloy Catalyst for Hydrazine Electrooxidation in Alkaline Media

机译：碱性介质中炭黑，氮和硫共掺杂石墨和石墨烯片状负载镍钴合金催化剂催化肼电氧化的研究

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In this work, three different types of carriers were used: VULCAN XC-72 conductive carbon black, nitrogen and sulphur codoped graphite (NSG) and the graphene-like sheets adsorbed sodium salt of flavin mononucleotide (FMNSC). Catalysts with three kinds of carriers supporting Ni and four Ni-Co alloy catalysts with different Ni-Co ratios were prepared by a simple chemical reduction method. Next, the catalytic process and performance for hydrazine electrooxidation in alkaline media were studied. The structure and morphology of the obtained Ni and Ni-Co alloy catalysts were characterized by X- ray diffraction (XRD), energy dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS). The electrocatalytic performance of the catalysts toward hydrazine electrooxidation was investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) methods. The results show that the catalytic performance of FMNSG supported NiCo with four different ratios is better than that for the conductive carbon black and nitrogen and sulphur codoped graphite. Otherwise, the catalytic performance of Ni8Co2 alloy catalyst is better than that of the catalysts with other Ni-Co ratios. This finding suggests that the catalytic performance can be improved by adding an appropriate proportion of Co atoms. The EIS results show that electron transfer processes present on the surface and the impedance of preliminary and secondary oxidation is also lower than for other catalysts, showing high catalytic activity. The analysis results of XPS indicate that the high amount of Ni2+ and Co2+ 2- existed on the catalysts may be improve the rate of intermediate ([HO–H2N=NH2–OH] ) formation and rate-limiting step, thereby can enhance the electrocatalytic activity.
机译：在这项工作中，使用了三种不同类型的载体：VULCAN XC-72导电炭黑，氮和硫共掺杂石墨（NSG）和石墨烯样薄片吸附了黄素单核苷酸的钠盐（FMNSC）。采用简单的化学还原法制备了三种负载镍的载体催化剂和四种镍钴比不同的镍钴合金催化剂。接下来，研究了碱性介质中肼电氧化的催化过程和性能。通过X射线衍射（XRD），能量色散谱（EDS）和X射线光电子能谱（XPS）表征了所获得的Ni和Ni-Co合金催化剂的结构和形态。通过循环伏安法（CV），计时电流法（CA）和电化学阻抗谱法（EIS）研究了催化剂对肼电氧化的电催化性能。结果表明，四种不同比例的FMNSG负载NiCo的催化性能均优于导电性炭黑和氮硫共掺杂石墨。否则，Ni8Co2合金催化剂的催化性能要好于其他Ni-Co比的催化剂。该发现表明，通过添加适当比例的Co原子可以改善催化性能。 EIS结果表明，表面上存在的电子转移过程以及初步和二次氧化的阻抗也低于其他催化剂，显示出高催化活性。 XPS的分析结果表明，催化剂上大量存在的Ni2 +和Co2 + 2-可能会提高中间体（[HO-H2N = NH2-OH]）的形成速率和限速步骤，从而增强电催化性能。活动。

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