One-step synthesis of reduced graphene oxide-supported PtCo nanoalloys with enhanced electrocatalytic activity for methanol oxidation
One-step synthesis of reduced graphene oxide-supported PtCo nanoalloys with enhanced electrocatalytic activity for methanol oxidation
复制标题
一步合成还原氧化石墨烯负载的 PtCo 纳米合金，具有增强的甲醇氧化电催化活性
DOI：
10.1007/s11581-016-1727-9
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发表时间：
2016-11-01
期刊：
影响因子：
2.8
通讯作者：
Zhang, Shengli
中科院分区：
文献类型：
--
作者：
Gao, Haili;He, Lilie;Zhang, Shengli
直接甲醇燃料电池（DMFC）因其能量转换效率高、工作温度低、废气排放低等优点成为近年来的研究热点。在这项研究中，通过一步还原法，通过 PtCl62−、Co2+ 和氧化石墨烯 (GO) 在乙二醇中的共还原，成功合成了负载在还原氧化石墨烯 (RGO) 上的 PtCo 纳米合金。傅里叶变换红外光谱、X射线衍射、能量色散X射线光谱、透射电子显微镜和X射线光电子能谱技术分别用于研究微观结构、成分、粒径和形貌。结果表明，高度分散的 PtCo 纳米合金的平均尺寸为 ca. 2.4 nm 分散在 RGO 片材的表面上。研究了PtCo/RGO、Pt/RGO和Pt/C催化剂对甲醇氧化的催化性能，结果表明PtCo/RGO纳米合金比Pt/RGO和Pt/C催化剂表现出更高的催化性能和稳定性。此外，由于Co的添加，PtCo/RGO催化剂表现出改善的CO耐受能力。
Direct methanol fuel cells (DMFCs) have recently become the research hotspot, due to their high energy-conversion efficiency, low operating temperature, and low exhaust emission. In this study, PtCo nanoalloys supported on reduced graphene oxide (RGO) were successfully synthesized via a one-step reduction method, carried out by coreduction of PtCl62−, Co2+and graphene oxide (GO) in ethylene glycol. Fourier-transform infrared spectra, X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy techniques were used to study microstructure, composition, particle size, and morphology, respectively. The results show that highly dispersed PtCo nanoalloys with average sizes of ca. 2.4 nm are dispersed on the surfaces of RGO sheets. The catalytic performances of the PtCo/RGO, Pt/RGO, and Pt/C catalysts toward methanol oxidation were studied, which indicates that PtCo/RGO nanoalloys show higher catalytic performance and stability than Pt/RGO and Pt/C catalysts. Furthermore, the PtCo/RGO catalyst exhibits improved CO-tolerance ability due to the addition of Co.