He Miao, Fei Guoxia, Zheng Zhuo, Cheng Zhengang, Wang Zhanhua, Xia Hesheng
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute , Sichuan University , Chengdu 610065 , PR China.
Langmuir. 2019 Mar 12;35(10):3694-3700. doi: 10.1021/acs.langmuir.9b00021. Epub 2019 Feb 28.
Platinum-decorated graphene aerogel microspheres were fabricated through a combined electrospraying, freeze-casting, and solvothermal process. Platinum nanoparticles with a narrow size distribution are evenly anchored on the graphene aerogel microspheres without agglomeration benefitting from the distinct center-diverging microchannel structure of the graphene aerogel microspheres, which results in the as-prepared catalysts presenting excellent electrocatalytic performance including high electrocatalytic activity and high poison tolerance toward methanol electro-oxidation, showing great potential for direct methanol fuel cell anode catalysts. In particular, the platinum-decorated graphene aerogel microspheres exhibit an extremely high mass activity of 1098.9 mA mg toward methanol oxidation as well as excellent antipoisoning ability, which are dramatically enhanced compared with Pt particles dispersed on graphene oxide and commercial carbon black supports.
通过电喷雾、冷冻铸造和溶剂热法相结合的工艺制备了铂修饰的石墨烯气凝胶微球。尺寸分布窄的铂纳米颗粒均匀地锚定在石墨烯气凝胶微球上，没有团聚，这得益于石墨烯气凝胶微球独特的中心发散微通道结构，使得所制备的催化剂具有优异的电催化性能，包括高电催化活性和对甲醇电氧化的高抗毒能力，显示出作为直接甲醇燃料电池阳极催化剂的巨大潜力。特别是，铂修饰的石墨烯气凝胶微球对甲醇氧化表现出极高的质量活性，为1098.9 mA mg，以及优异的抗中毒能力，与分散在氧化石墨烯和商业炭黑载体上的铂颗粒相比，这些性能得到了显著增强。
