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首页> 外文期刊>International Journal of Electrochemical Science >WO3 Modified Graphene Supported Pt Electrocatalysts with Enhanced Performance for Oxygen Reduction Reaction
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WO3 Modified Graphene Supported Pt Electrocatalysts with Enhanced Performance for Oxygen Reduction Reaction

机译：WO 3 修饰的石墨烯负载的Pt电催化剂具有增强的氧还原反应性能

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摘要

To improve performance of Pt catalyst, the unique Pt/WO3-G catalysts for oxygen reduction reaction (ORR) are prepared, in which WO3 modified graphene (WO3-G) is adopted as a carrier. According to XRD experiment results, Pt/WO3-G catalysts are primarily composed of Pt nanoparticles, monoclinic WO3 and graphene. The TEM and high resolution TEM analysis indicate that Pt/WO3-G catalyst with the coexistence of Pt particles and WO3 has narrower distribution of Pt particles with average particle size of 3.9 nm. As expected, The Pt/WO3-G catalysts reveal better electrocatalytic activity with higher current densities, lower overpotential and faster kinetics process compared to the Pt/G catalyst. The enhancement of ORR activity on Pt/WO3-G electrocatalyst is probably attributed to the synergistic effect between Pt and WO3 nanoparticles. Specifically, the interaction between Pt and WO3 can increase the dispersion of Pt nanoparticles, accelerate the protonation of the O2 molecule and decrease the adsorption strength of oxygenated species.
机译：为了提高Pt催化剂的性能，制备了独特的Pt / WO3-G氧还原反应催化剂（ORR），其中WO3改性石墨烯（WO3-G）为载体。根据XRD实验结果，Pt / WO3-G催化剂主要由Pt纳米颗粒，单斜晶WO3和石墨烯组成。 TEM和高分辨率TEM分析表明，Pt / WO3-G催化剂与Pt颗粒和WO3共存，Pt颗粒分布较窄，平均粒径为3.9nm。不出所料，与Pt / G催化剂相比，Pt / WO3-G催化剂具有更高的电催化活性，更高的电流密度，更低的过电势和更快的动力学过程。 Pt / WO3-G电催化剂上ORR活性的增强可能归因于Pt和WO3纳米颗粒之间的协同作用。具体而言，Pt和WO3之间的相互作用会增加Pt纳米颗粒的分散性，加速O2分子的质子化并降低含氧物质的吸附强度。

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