Durable platinum/graphene catalysts assisted with polydiallyldimethylammonium for proton-exchange membrane fuel cells
Durable platinum/graphene catalysts assisted with polydiallyldimethylammonium for proton-exchange membrane fuel cells
复制标题
用于质子交换膜燃料电池的聚二烯丙基二甲基铵辅助的耐用铂/石墨烯催化剂
DOI：
10.1016/j.electacta.2013.09.119
复制
发表时间：
2013
影响因子：
6.6
通讯作者：
Wang Y. G.
中科院分区：
文献类型：
--
作者：
Lei M.;Liang C.;Wang Y. J.;Huang K.;Ye C. X.;Liu G.;Wang W. J.;Jin S. F.;Zhang R.;Fan D. Y.;Yang H. J.;Wang Y. G.
以聚二烯丙基二甲基铵（PDDA）为载体，制备了高性能、电化学稳定的Pt/石墨烯质子交换膜燃料电池催化剂。详细考察了催化剂的制备工艺和性能。通过引入PDDA分子，Pt纳米颗粒可以很好地分散在石墨烯载体上，从而提高电化学表面积和增强的电催化活性。对于具有Pt/石墨烯、Pt-PDDA/石墨烯和Pt/石墨烯-PDDA催化剂的催化剂层，由循环伏安曲线上的氢解吸峰计算的催化剂层的相应电化学表面积（ECSA）分别为78.3、72.5和73.6 cm 2 g-1。PDDA改性的Pt纳米颗粒和PDDA改性的石墨烯载体在相同条件下与常规制备的Pt/石墨烯催化剂相比，也表现出对电化学氧化循环的高耐久性。在3000次循环后，对于Pt/石墨烯电催化剂，仅保留23.52%的初始ECSA，而对于Pt/石墨烯-PDDA和Pt-PDDA/石墨烯催化剂，分别保留43.04%和37.7%的初始ECSA。
High performance and electrochemically stable Pt/graphene catalysts assisted with polydiallyldimethylammonium (PDDA) have been synthesized for PEM fuel cells. The preparation procedure and properties of the catalysts are investigated in detail. With the introduction of PDDA molecules, Pt nanoparticles can be well-dispersed on graphene support, resulting in improved electrochemical surface area and enhanced electrocatalytic activity. The corresponding electrochemical surface areas (ECSA) of catalyst layers calculated from the hydrogen desorption peak on cyclic voltammogram curves are 78.3, 72.5 and 73.6 cm2g−1for catalyst layers with Pt/graphene, Pt-PDDA/graphene, and Pt/graphene-PDDA catalysts, respectively. Both PDDA modified Pt nanoparticles and PDDA modified graphene supports also exhibit high durability toward electrochemical oxidation cycles compared with the conventional produced Pt/graphene catalyst at the same conditions. After 3000 cycles, only 23.52% of the initial ECSA remains for Pt/graphene electrocatalyst whereas 43.04% and 37.7% of the initial ECSA for the Pt/graphene-PDDA and Pt-PDDA/graphene catalysts remain, respectively.