石墨烯负载铂-钨催化剂上甲醇电氧化的研究

IF 0.5 4区化学 Q4 CHEMISTRY, MULTIDISCIPLINARY

Chemija Pub Date : 2019-09-24 DOI:10.6001/chemija.v30i3.4049

Teofilius Kilmonis, Antanas Nacys, D. Šimkūnaitė, L. Tamašauskaitė-Tamašiūnaitė, A. Balčiūnaitė, E. Norkus

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引用次数: 1

摘要

采用快速微波辅助加热方法制备了Pt:W摩尔比分别为1.6:1、2.3:1和7.1:1的石墨烯（GR）负载铂-钨（PtW）催化剂。用循环伏安法（CV）和计时电流法（CA）研究了催化剂在碱性介质中电氧化甲醇的活性。已经确定甲醇氧化速率取决于PtW/GR催化剂中的Pt:W摩尔比。从CV测量结果可以看出，对于Pt:W摩尔比等于1.6:1的PtW/GR催化剂，获得了最高的电流密度值、比活性和质量活性。类似地，计时电流法测量表明，在相同的Pt:W摩尔比下，PtW/GR催化剂具有最佳性能。此外，在所有情况下，与裸Pt/GR和W/GR催化剂相比，无论Pt:W摩尔比不同，合成的PtW/GR催化剂对甲醇的直接电氧化都表现出增强的电催化活性。

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Investigation of methanol electro-oxidation on graphene supported platinum–tungsten catalyst

The graphene (GR) supported platinum–tungsten (PtW) catalysts with Pt:W molar ratios, equal to 1.6:1, 2.3:1 and 7.1:1, were prepared by a rapid microwave-assisted heating method. The activity of the catalysts was investigated for the electro-oxidation of methanol in an alkaline medium by means of cyclic voltammetry (CV) and chronoamperometry (CA). It has been determined that the rate of methanol oxidation depends on the Pt:W molar ratio in the PtW/GR catalysts. From the CV measurements it follows that the highest current density values, specific and mass activities are obtained for the PtW/GR catalyst with the Pt:W molar ratio equal to 1.6:1. Similarly, the chronoamperometry measurements point to the best performance of the PtW/GR catalyst with the same Pt:W molar ratio. Moreover, in all cases the synthesized PtW/GR catalysts, regardless of different Pt:W molar ratio, show an enhanced electrocatalytic activity towards the direct electro-oxidation of methanol when compared with that for the bare Pt/GR and W/GR catalysts.

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来源期刊

Chemija 化学-化学综合

CiteScore

1.30

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Chemija publishes original research articles and reviews from all branches of modern chemistry, including physical, inorganic, analytical, organic, polymer chemistry, electrochemistry, and multidisciplinary approaches.