Fabrication of bimetallic PtPd alloy nanospheres supported on rGO sheets for superior methanol electro-oxidation
Fabrication of bimetallic PtPd alloy nanospheres supported on rGO sheets for superior methanol electro-oxidation
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DOI：
10.1016/j.ijhydene.2017.07.193
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发表时间：
2018-02-22
影响因子：
7.2
通讯作者：
Somala, Adinarayana Reddy
中科院分区：
文献类型：
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作者：
Esabattina, Sunanda;Posa, Venkata Ramana;Somala, Adinarayana Reddy
采用一锅湿回流法在还原氧化石墨烯（rGO）片上制备了双金属PtPd纳米球（rGO-PtPd），并对甲醇进行了上级电氧化。没有任何其他聚合物或种子参与制备纳米复合材料。采用粉末X射线衍射（P-XRD）、拉曼光谱、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对材料的结构和形貌进行了表征。由于PtPd纳米颗粒负载的rGO片具有大的电化学表面积（ECSA，是商品Pt/C黑的1.68倍）和Pt/C合金的协同效应，其对甲醇电氧化（莫尔）表现出上级电催化活性和稳定性。由于颗粒尺寸和颗粒分布均匀，rGO-PtPd在酸性介质中对莫尔反应表现出更强的电催化性能，其中rGO-Pt 1 Pd 1（Pt/Pd摩尔比1/1）对莫尔反应表现出更高的比活性、质量活性和稳定性。因此，合成的rGO-PtPd催化剂可以在直接甲醇燃料电池（DMFC）中应用，以降低其成本并提高其循环能力，这使其在能量转换和储存方面具有实用催化的前景。(C)2017年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Bimetallic PtPd nanospheres strongly fabricated on reduced graphene oxide (rGO) sheets (rGO-PtPd) by simple one pot wet reflux method for superior methanol electro-oxidation. There is no any other polymer or seed involved for preparation of nanocomposite. The as-synthesized materials structure and morphology was calibrated by Powdered X-ray diffraction (P-XRD), Raman, X-ray photo electron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The PtPd nanoparticles supported rGO sheets displays superior electro-catalytic activity and stability towards methanol electro-oxidation (MOR) because of their large electrochemical surface area (ECSA, which is 1.68 times greater than that of commercial Pt/C black) and synergistic effect of the bimetallic alloy. The rGO-PtPd showed enhanced electro-catalytic performances towards MOR in acidic media due to particle size and uniform distribution of particles, which rGO-Pt1Pd1 (Pt/Pd molar ratio 1/1) showed the more specific activity, mass activity and stability for MOR. Thus, as-synthesized rGO-PtPd catalyst could apply potential applications in direct methanol fuel cells (DMFCs) to lower their cost and advance their cycle ability, which make it promising for practical catalysis in energy conversion and storage. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.