Rapid Microwave‐Assisted Solvothermal Synthesis of Methanol Tolerant Pt–Pd–Co Nanoalloy Electrocatalysts
Rapid Microwave‐Assisted Solvothermal Synthesis of Methanol Tolerant Pt–Pd–Co Nanoalloy Electrocatalysts
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DOI：
10.1002/fuce.200900139
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发表时间：
2010-06
期刊：
影响因子：
2.8
通讯作者：
A. Sarkar;A. Murugan;A. Manthiram
中科院分区：
文献类型：
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作者：
A. Sarkar;A. Murugan;A. Manthiram
我们在这里报告了一种微波辅助溶剂热（MW-ST）方法来合成碳支撑的Pt，Pd和Co的多金属纳米结构合金，具有高结晶度和均匀性，可用于燃料电池的电催化应用。多金属纳米合金电催化剂已通过一锅法、快速MW-ST法在<300 °C下在15分钟内合成，而无需在还原气体气氛中进行任何后退火。为了比较，还通过共沉淀金属的热处理合成相同的多金属合金。通过这两种方法合成的合金的相结构和表面组成中观察到显着差异，这是合理化的基础上采用的合成程序。此外，多金属合金也探索了其作为阴极催化剂用于氧还原反应（ORR）的电催化应用。通过MW-ST方法合成的多金属合金与通过常规硼氢化物还原方法合成的对应物相比显示出高得多的ORR活性。虽然Pt 70 Pd 20 Co 10的ORR活性与商业Pt的ORR活性相当，但在高甲醇浓度下，Pt 50 Pd 30 Co20在直接甲醇燃料电池（DMFC）中的ORR活性上级于商业Pt的ORR活性，这是由于其对可能从阳极跨越到阴极的甲醇的高耐受性。
We report here a microwave‐assisted solvothermal (MW‐ST) method to synthesise carbon‐supported multimetallic nanostructured alloys of Pt, Pd and Co with high crystallinity and homogeneity for electrocatalytic application in fuel cells. Multimetallic nanoalloy electrocatalysts have been synthesised by a one‐pot, rapid MW‐ST method within 15 min at <300 °C without any post‐annealing in reducing gas atmospheres. For a comparison, same multimetallic alloys were also synthesised by heat treatment of co‐precipitated metals. Significant differences were observed in the phase structure and surface composition of the alloys synthesised by the two methods, which were rationalised based on the synthesis procedures adopted. Further, the multimetallic alloys were also explored for their electrocatalytic applications as cathode catalysts for oxygen reduction reaction (ORR). The multimetallic alloys, synthesised by the MW‐ST method, show much higher ORR activity compared to their counterparts synthesised by the conventional borohydride reduction method. While the ORR activity of Pt70Pd20Co10 is comparable to that of commercial Pt, the ORR activity of Pt50Pd30Co20 in direct methanol fuel cells (DMFC) is superior to that of commercial Pt at high methanol concentrations due to its high tolerance to methanol that may crossover from the anode to the cathode.