Guo Ruihua, An Na, Huang Yarong, Guan Lili, Zhang Guofang, Zhu Guofu, Liu Zhaogang
College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Inner Mongolia Key Laboratory of Advanced Ceramics and Device, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Nanomaterials (Basel). 2022 Dec 14;12(24):4451. doi: 10.3390/nano12244451.
Direct ethanol fuel cell (DEFC) has attracted wide attention due to its wide range of fuel sources, cleanliness, and high efficiency. However, the problems of low catalytic efficiency and poor catalyst stability still exist in DEFC catalysts, which restrict its rapid development. With chloroplatinic acid (HPtCl·6HO) as the precursor, Polyvinylpyrrolidone (PVP) plays the role of surfactant, stabilizer, and reducing agent in the experiment. Glycine is the surface control agent and co-reducing agent. Pt high-index facets nanocatalyst was prepared with the one-pot hydrothermal method by adjusting the amount of PVP and glycine. X-Ray Diffraction (XRD), transmission electron microscope (TEM), and scanning electron microscope (SEM) were used to characterize the micro-structure of the nanocatalyst, and the influence of PVP and glycine on the synthesis of high-index facets catalyst was studied. The electrocatalytic performance of the catalyst was tested with an electrochemical workstation, and it was found that the performance of the prepared catalyst was better than that of the commercial catalyst. When the mass ratio of PVP and Pt was 50:1 and the molar ratio of glycine and Pt was 24:1, Pt nanocatalysts with {310}, {520} and {830} high exponential facets were prepared. The electrochemical test results showed that the peak current density of ethanol oxidation was 2.194 m/g, and the steady-state current density was 0.241 mA/cm, which was 5.7 times higher than that of commercial catalyst. The results of this paper show that due to the defects such as steps and kinks on the surface of the high-index facets, the active sites are increased, thus showing excellent electrocatalytic performance. This study provides a theoretical basis for the development and commercial application of high index facets nanocatalysts.
直接乙醇燃料电池（DEFC）因其燃料来源广泛、清洁且高效而备受关注。然而，DEFC催化剂仍存在催化效率低和催化剂稳定性差的问题，这限制了其快速发展。以氯铂酸（HPtCl·6H₂O）为前驱体，聚乙烯吡咯烷酮（PVP）在实验中起到表面活性剂、稳定剂和还原剂的作用。甘氨酸是表面控制剂和共还原剂。通过调节PVP和甘氨酸的用量，采用一锅水热法制备了Pt高指数面纳米催化剂。利用X射线衍射（XRD）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对纳米催化剂的微观结构进行表征，研究了PVP和甘氨酸对高指数面催化剂合成的影响。用电化学工作站测试了催化剂的电催化性能，发现所制备催化剂的性能优于商业催化剂。当PVP与Pt的质量比为50:1且甘氨酸与Pt的摩尔比为24:1时，制备出具有{310}、{520}和{830}高指数面的Pt纳米催化剂。电化学测试结果表明，乙醇氧化的峰值电流密度为2.194 mA/g，稳态电流密度为0.241 mA/cm²，比商业催化剂高5.7倍。本文结果表明，由于高指数面表面存在台阶和扭结等缺陷，增加了活性位点，从而表现出优异的电催化性能。该研究为高指数面纳米催化剂的开发和商业应用提供了理论依据。
