Abstract
Fabrication of superior catalytic performance palladium-based catalysts with affordable cost is the key to develop direct ethanol fuel cell. Herein, Pd-decorated three-dimensional (3D) porous constructed from graphene oxide (GO) and MXene combining with polystyrene (PS) particles as sacrificial templates (Pd/GO-MXene-PS) to elevate the catalytic performance for ethanol oxidation was proposed. The 3D porous interconnected structure of Pd/GO-MXene-PS was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and Brunner−Emmet−Teller (BET). By optimizing the doping ratio of MXene to GO, the mass activity of Pd/GO5-MXene5-PS (2944.0 mA·mg−1) was 3.0 times higher than that of commercial Pd/C (950.4 mA·mg−1) toward ethanol oxidation in base solution. Meanwhile, the rotating disk electrode (RDE) results demonstrated that Pd/GO5-MXene5-PS had a faster kinetics of ethanol oxidation. The enhanced ethanol oxidation over Pd/GO5-MXene5-PS could attribute to the excellent 3D interconnected porous structure, large surface area, good conductivity and homogeneous Pd distribution. This work provided a new idea for creating 3D porous MXene composite materials in electrocatalysis.
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摘要
制备低成本、催化性能优异的钯基催化剂是提升直接乙醇燃料电池性能的关键。为了进一步提高乙醇电氧化的催化性能, 我们制备了以聚苯乙烯 (PS) 微球为牺牲模板, 由氧化石墨烯(GO)和MXene共同构建的Pd基三维多孔催化剂(Pd/GO-MXene-PS)。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和Brunner-Emmet-Teller (BET)对Pd/GO-MXene-PS催化剂的三维多孔结构进行了表征。优化MXene与GO的掺杂比例后, 制备出的Pd/GO5-MXene5-PS催化剂对乙醇电催化氧化的质量活性(2944.0 mA·mg−1)是商用Pd/C(950.4 mA·mg−1)催化剂的3.0倍。旋转圆盘电极测试的结果进一步表明Pd/GO5-MXene5-PS具有更快的乙醇氧化动力学,这主要归因于催化剂本身拥有大表面积和良好的导电性的三维多孔结构。本工作为制备三维多孔MXene复合材料提供了一个新的思路。
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Acknowledgements
This study was financially supported by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning (No. A30B191410), the Sailing Project from Science and Technology Commission of Shanghai Municipality (No. 17YF1406600), Chenguang Project Supported by Shanghai Municipal Education Commission (No. 18CG68) and Gaoyuan Discipline of Shanghai-Materials Science and Engineering (No. A30NH221903), the Open Project of Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices (Soochow University) (No. KS2022), Collaborative Innovation Center of Suzhou Nano Science & Technology, the 111 Project, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, and the Project of Guangdong Provincial Education (No. 2020KTSCX131).
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Chen, YZ., Zhou, M., Huang, YF. et al. Enhanced ethanol oxidation over Pd nanoparticles supported porous graphene-doped MXene using polystyrene particles as sacrificial templates. Rare Met. 41, 3170–3179 (2022). https://doi.org/10.1007/s12598-022-02039-5
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DOI: https://doi.org/10.1007/s12598-022-02039-5