Simultaneous sulfonation and reduction of graphene oxide as highly efficient supports for metal nanocatalysts
Simultaneous sulfonation and reduction of graphene oxide as highly efficient supports for metal nanocatalysts
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氧化石墨烯的同时磺化和还原作为金属纳米催化剂的高效载体
DOI：
10.1016/j.carbon.2013.09.005
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发表时间：
2014-01-01
期刊：
影响因子：
10.9
通讯作者：
Mu, Shichun
中科院分区：
文献类型：
--
作者：
He, Daping;Kou, Zongkui;Mu, Shichun
研究了磺化还原氧化石墨烯（S-rGO）作为质子交换膜燃料电池（PEMFC）催化剂的载体和尺寸可控铂纳米颗粒（NPs）。以氧化石墨烯和（NH4）(2)SO4的液体混合物为原料，在惰性气体中进行热处理，采用冻干辅助法制备了S-rGO。在氧化石墨烯上接枝磺酸基团，同时实现了氧化石墨烯的还原。透射电镜（TEM）结果显示，Pt纳米粒子在S-rGO表面均匀沉积（Pt/S-rGO），粒径分布较窄，直径在2 ~ 5 nm之间。通过循环伏安法和氧还原反应测量，发现该新型Pt/S-rGO催化剂的催化活性比Pt/GO、Pt/rGO和传统Pt/C催化剂更高。值得注意的是，Pt/S-rGO催化剂也表现出优异的电化学稳定性。因此，在增强活性和耐久性方面，这种新型催化剂在pemfc中具有很大的应用潜力。(C) 2013 Elsevier Ltd.版权所有。
The sulfonated reduced graphene oxide (S-rGO) as supports and size-controlled Pt nanoparticles (NPs) for proton exchange membrane fuel cell (PEMFC) catalysts was investigated. The S-rGO was fabricated by a lyophilization-assisted method from a liquid mixture of GO and (NH4)(2)SO4 with a subsequent thermal treatment in inert gas. Sulfonic acid groups were grafted on GO and a reduction of GO was achieved simultaneously. Transmission electron microscope (TEM) results showed a uniform deposition of Pt NPs on S-rGO (Pt/S-rGO) with a narrow particle size distribution ranging from 2 to 5 nm in diameter. A higher catalytic activity of this novel Pt/S-rGO catalyst was revealed in comparison with that of Pt/GO, Pt/rGO and conventional Pt/C catalysts by cyclic voltammetry and oxygen reduction reaction measurements due to an enhanced triphase boundary. Significantly, the Pt/S-rGO catalyst also presented an excellent electrochemical stability. This new catalyst thus holds a great potential application in PEMFCs in terms of enhanced activity and durability. (C) 2013 Elsevier Ltd. All rights reserved.