College of Mechanics and Materials, Hohai University, Nanjing, 210098, China.
Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.
Small. 2017 Mar;13(10). doi: 10.1002/smll.201603013. Epub 2016 Dec 27.
Although direct methanol fuel cell offers high energy use efficiency and low pollution emission, the lack of suitable electrode materials poses a great challenge to its commercial application. Herein, a facile and scalable approach is developed to fabricate a hybrid electrocatalyst consisting of strongly coupled worm-shape Pt nanocrystals and nitrogen-doped low-defect graphene (N-LDG) sheets. Interestingly, it is found that the formation of Pt nanoworms (NWs) is induced by the N atoms in the high-quality carbon matrix, which also allows the integration of their respective structural advantages and leads to a strong synergetic coupling effect. As a result, the obtained Pt NW/N-LDG catalyst exhibits an extremely high mass activity of 1283.1 mA mg toward methanol oxidation reaction, accompanied by reliable long-term stability and good antipoisoning ability, which are dramatically enhanced as compared with conventional Pt nanoparticle catalysts dispersed on undoped LDG, reduced graphene oxide, and commercial carbon black supports.
尽管直接甲醇燃料电池具有高能量利用率和低污染排放的优点，但缺乏合适的电极材料仍是其商业化应用的巨大挑战。在此，开发了一种简便且可扩展的方法来制备由强耦合蠕虫状 Pt 纳米晶和氮掺杂低缺陷石墨烯（N-LDG）片组成的混合电催化剂。有趣的是，研究发现 Pt 纳米线（NWs）的形成是由高质量碳基体中的 N 原子诱导的，这也使得它们各自的结构优势得以整合，并产生了强烈的协同耦合效应。结果，所获得的 Pt NW/N-LDG 催化剂在甲醇氧化反应中表现出极高的质量活性，达到 1283.1 mA mg-1，同时具有可靠的长期稳定性和良好的抗中毒能力，与分散在未掺杂 LDG、还原氧化石墨烯和商业炭黑载体上的传统 Pt 纳米颗粒催化剂相比，这些性能均得到显著增强。
