Preparation of the Reduced Graphene Oxide⁃Based Tin Selenide Nano⁃Petal Composite and Its Electrocatalytic Properties

doi:10.12422/j.issn.1672-6952.2024.06.006

Abstract

Abstract:

The reduction of graphene oxide(GO), in?situ loading of SnSe and interface assembly were achieved simultaneously by microwave method, and the reduced graphene oxide(rGO)?supported the petal?shaped SnSe (SnSe/rGO) composite was successfully prepared. The SnSe/rGO was characterized by Raman spectroscopy, X?ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), and the effects of different rGO contents for SnSe/rGO composite on the electrocatalytic oxygen reduction reaction(ORR) were investigated. The results indicated that there was an interaction between SnSe and matrix rGO, and Sn-C and Sn-O-C bonds were used as bridges of charge transfer. The intimate interconnection between the petal?like SnSe and the rGO formed a robust three?dimensional mesh structure, which served to reinforce the overall structural integrity of the catalyst, preventing its collapse. Based on this, the optimized SnSe/10%rGO catalyst (10rGO means that the mass fraction of rGO is 10%) exhibited excellent ORR activity with a limiting current density of 3.79 mA/cm², an onset voltage （vs.RHE） of 0.85 V, and an electron transfer number of 3.10. Meanwhile, the SnSe/10%rGO catalyst performed the electrocatalysis long?term stability superior that of commercial 20%Pt/C （20%Pt means that the mass fraction of Pt is 20%） with the current density remaining 81.15% of the start value after 20 000 s of reaction. The present work offers insights into the preparation of non?precious metal cathode oxygen reduction catalytic materials for fuel cells.

Key words: Tin selenide, Reduced graphene oxide, Oxygen reduction, Fuel cell, Microwave method

摘要：

采用微波法一步实现氧化石墨烯还原与SnSe的原位负载及界面组装，成功制备了还原氧化石墨烯（rGO）负载花瓣状SnSe复合材料（SnSe/rGO）。通过拉曼光谱、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）等分析手段对SnSe/rGO进行表征，并研究了rGO质量分数对复合材料电催化氧还原反应（ORR）性能的影响。结果表明，SnSe与基体rGO之间产生相互作用，并以Sn—C和Sn—O—C为电荷转移的桥梁；花瓣状SnSe与rGO紧密结合，形成了较为稳固的三维网状结构，支撑催化剂总体结构不坍塌；SnSe/10%rGO催化剂（10%rGO表示rGO的质量分数为10%）具有良好的ORR活性，其极限电流密度为3.79 mA/cm²，起始电压（vs.RHE）为0.85 V，电子转移数为3.10；具有比商业20%Pt/C催化剂（20%Pt表示Pt质量分数为20%）更为优良的电催化长期稳定性：反应20 000 s后的相对电流密度仍能保持81.15%。研究结果为燃料电池用非贵金属阴极ORR催化材料的制备提供了思路。

关键词: 硒化锡, 还原氧化石墨烯, 氧气还原, 燃料电池, 微波法

CLC Number:

TQ134.32

Yanan WANG, Chuchu MENG, Liran PEI, Xitong WANG, Junhua LI, Jianhua QIAN. Preparation of the Reduced Graphene Oxide⁃Based Tin Selenide Nano⁃Petal Composite and Its Electrocatalytic Properties[J]. Journal of Liaoning Petrochemical University, 2024, 44(6): 42-50.

王亚男, 孟楚楚, 裴笠然, 王栖桐, 李君华, 钱建华. 花瓣状SnSe/rGO复合材料的制备及其电催化氧还原性能[J]. 辽宁石油化工大学学报, 2024, 44(6): 42-50.

Figures/Tables 11

Fig.1 Process flow chart of the preparation of SnSe/xrGO composites by microwave method, SEM images of the samples, and the elements mapping of SnSe/10%rGO of SnSe/xrGO prepared by microwave method

Fig.2 XRD pattern of SnSe/xrGO, SnSe and rGO

Fig.3 Raman spectra of GO, SnSe and SnSe/xrGO

Fig.4 High?resolution XPS spectra of SnSe and SnSe/xrGO

Fig.5 CV curves of SnSe and SnSe/xrGO

Fig.6 LSV curves at different rotating speeds and K?L curves of at different voltages of SnSe/10%rGO

Fig.7 LSV curves of SnSe and SnSe/xrGO

Fig.8 Average electron transfer number of SnSe and SnSe/xrGO

Fig.9 Tafel curves of SnSe and SnSe/xrGO

Fig.10 Nyquist curves of SnSe and SnSe/xrGO

Fig. 11 The methanol tolerance test curves and chronoamperometric curves of optimal SnSe/10%rGO and commercial 20%Pt/C

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