Microwave induced construction of highly dispersed Pd/FeP catalysts and their electrocatalytic performance

被引：0
|
作者：
Li A. [1 ]
Zhao Z. [1 ]
Li H. [1 ]
Gao X. [1 ,2 ]
机构：
[1] National Engineering Research Center of Distillation Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin
[2] Haihe Laboratory of Sustainable Chemical Transformations, Tianjin
来源：
Huagong Xuebao/CIESC Journal | 2024年 / 75卷 / 04期
关键词：
catalyst; electrochemistry; microwave synthesis; nanostructure; size distribution;
D O I：
10.11949/0438-1157.20231388
中图分类号：
学科分类号：
摘要：
As a novel method of process intensification, microwave technology has been widely used in material preparation. The selective heating characteristic of microwave-absorbing support can lead to the formation of local overheating domains, inducing the deposition of catalyst over the support surface, which is promising to construct highly dispersed Pd-based catalysts that are crucial to improve their electrocatalytic activity and therefore promote the performance of formic acid fuel cells. With the aim to explore the feasibility of facile fabrication of highly dispersed Pd-based catalysts induced by microwave, this study first prepared microwave-absorbing ferrous phosphide (FeP) particles in the shape of hollow sea urchin using a hydrothermal method to serve as catalyst support, where Pd was deposited through ethylene glycol reduction under conventional heating and microwave heating methods, respectively. XRD, TEM, and SEM technologies were used to characterize the morphology and microstructure of Pd/FeP products, and to explore the effect of microwave heating on the dispersion of metal palladium particles on the catalyst surface. The catalytic activity of the prepared catalyst was evaluated using cyclic voltammetry and linear voltammetry. By exploring the structure-activity relationship between the structure of catalysts and their electrocatalytic activity, the strengthening mechanism of microwave synthesis on the performance of Pd/FeP catalyst was revealed. The experimental results indicate that the microwave-absorbing hollow sea urchin shaped FeP can induce the in situ deposition of Pd due to the formation of local“hot spots”, inducing the generation of highly dispersed Pd-based catalysts. Compared to traditionally prepared catalysts, the electrochemical active area of these catalysts obtained from microwave synthesis has a 3.5-fold increase, while the electrocatalytic oxidation performance of formic acid increases by about 54 times. © 2024 Materials China. All rights reserved.
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页码：1594 / 1606
页数：12
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