过渡金属碳基催化剂的制备及其电化学性能

Preparation and Electrochemical Performance of Transition Metal Carbon-based Catalyst

介绍了一种采用环保无毒的多巴胺(PDA)作为碳源,掺入过渡金属Co后,得到Co-PDA,再用熔盐煅烧法提取出催化剂的方法,并制备得到一种具有更高电池催化效率的碳基非贵金属催化剂。发现在多巴胺与钴离子为4∶1、加入10g盐(5.5g KCl和4.5g LiCl);煅烧时间3h;煅烧温度900℃时制备出的Co与碳材料复合的催化剂具有最高的半波电位(0.8228V vs RHE)和较高的极限电流密度(-5.3763mA/cm^(2)),更加接近商业Pt-C催化剂的半波电位。通过对催化剂进行XRD测试分析,发现熔盐煅烧后的产物主要是碳材料和单质钴两种物质。熔盐煅烧法制备出的碳材料具有更大的比表面积和丰富的孔洞结构,能够在催化剂合成过程中为物质传输提供有利的运输环境,使得钴能够较好固定在介孔碳表面,进而提供较多活性位点,保证催化剂具有良好的电催化活性和稳定性。

This article mainly introduces a method of using environmentally friendly and non-toxic dopamine(PDA)as a carbon source,adding transition metal Co to obtain Co-PDA,and then extracting catalyst by molten salt calcination.Carbon-based non-noble metal catalyst were obtained with higher battery catalytic efficiency.It is found that when the dopamine and cobalt ions are 4∶1,10 g salt(5.5 g KCl and 4.5 g LiCl)is added,the calcination time is 3 h,and the calcination temperature is 900℃,the prepared Co and carbon composite catalyst has the highest half-wave potential(0.8228 V vs RHE)and higher limiting current density(-5.3763 mA/cm^(2)),closer to the half-wave potential of commercial Pt-C catalysts.It is found that the products after calcination of molten salt are mainly carbon materials and elemental cobalt by XRD testing.The mesoporous structure of carbon materials has a large specific surface area and abundant pore structure,which can provide a favorable transportation environment for material transportation during the catalyst synthesis process,so that cobalt can fixed tightly on the surface of mesoporous carbon,thereby providing more active sites to ensure that the prepared catalyst has good electrocatalytic activity and stability.