燃料电池高活性Pt/C电催化剂的制备  

Preparation of highly active Pt/C electrocatalyst for fuel cells

作　　者：许友 徐辉 梁燕 王光应 赵羽 XU You;XU Hui;LIANG Yan;WANG Guangying;ZHAO Yu(Anhui Yuanchen Environmental Protection Technology Co.,Ltd.,Hefei 230000,Anhui,China)

机构地区：[1]安徽元琛环保科技股份有限公司,安徽合肥230000

出　　处：《上海师范大学学报（自然科学版）》2022年第4期474-482,共9页Journal of Shanghai Normal University(Natural Sciences)

摘　　要：实现低铂(Pt)载量高催化活性碳载铂(Pt/C)催化剂的制备,是达到降本增效的有效手段.实验研究了乙二醇溶液(EG)、甲醛溶液(HCHO)以及碱液(NaOH溶液)三者用量比例和后续热处理对水热法制备Pt/C催化剂电催化性能的影响.采用极化曲线(LSV)和循环伏安曲线(CV)表征催化剂的电催化性能,以及计算了Pt的电化学活性面积(ECA).通过X射线衍射(XRD)、透射电子显微镜(TEM)以及热重分析(TG)对催化剂进行物化性能表征.实验发现:在一定范围内适当提高HCHO占比可有效提升催化剂电催化性能,当V(EG)∶V(HCHO)∶V(NaOH)溶液体积比为1∶2∶1时,所制备的Pt/C催化剂经过250℃的后续热处理后,电催化性能最优.以该方法制备的低载量Pt/C催化剂的ECA大于高载量的商业Pt/C催化剂的ECA.Prepare of highly active carbon supported platinum(Pt/C)catalyst with low Pt loading is an effective means to reduce cost and increase efficiency.The effects of the ratio of ethylene glycol(EG),formaldehyde(HCHO)and alkaline solution(NaOH)and subsequent heat treatment on the electrocatalytic performance of Pt/C catalyst prepared by hydrothermal method were studied.The electrocatalytic performance of the catalyst was characterized by means of polarization curve(LSV)and the electrochemical active area(ECA)of platinum was calculated by cyclic voltammetry curve(CV).The physical and chemical properties of the catalyst were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM)and thermogravimetric analysis(TG).The results showed that the electrocatalytic performance of the catalyst could be improved effectively by properly increasing the HCHO ratio in a certain range.When the volume ratio of V(EG)∶V(HCHO)∶V(NaOH)solution is 1∶2∶1,the Pt/C catalyst prepared after the subsequent heat treatment at 250℃has the best electrocatalytic performance.The ECA of Pt/C catalyst with low loading prepared by the present method is higher than that of commercial Pt/C catalyst with high loading.

关 键 词：PT/C催化剂 水热法 热处理 极化曲线(LSV) 循环伏安曲线(CV) 

分 类 号：TM911.4[电气工程—电力电子与电力传动]