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首页> 外文期刊>Catalysis science & technology >Correlating the chemical composition and size of various metal oxide substrates with the catalytic activity and stability of as-deposited Pt nanoparticles for the methanol oxidation reaction
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Correlating the chemical composition and size of various metal oxide substrates with the catalytic activity and stability of as-deposited Pt nanoparticles for the methanol oxidation reaction

机译：相关的化学成分和大小各种金属氧化物催化底物活动和as-deposited Pt的稳定纳米粒子对甲醇氧化反应

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摘要

The performance of electrode materials in conventional direct alcohol fuel cells (DAFC) is constrained by (i) the low activity of the catalyst materials relative to their overall cost, (ii) the poisoning of the active sites due to the presence of partially oxidized carbon species (such as but not limited to CO, formate, and acetate) produced during small molecule oxidation, and (iii) the lack of catalytic stability and durability on the underlying commercial carbon support. Therefore, as a viable alternative, we have synthesized various metal oxide and perovskite materials of different sizes and chemical compositions as supports for Pt nano-particles (NPs). Our results including unique mechanistic studies demonstrate that the SrRuO3 substrate with immobilized Pt NPs at its surface evinces the best methanol oxidation performance as compared with all of the other substrate materials tested herein, including commercial carbon itself. Additionally, data from electron energy loss spectroscopy (EELS) and X-ray photoelectron spectroscopy (XPS) confirmed the presence of electron transfer from bound Pt NPs to surface Ru species within the SrRuO3 substrate itself, thereby suggesting that favorable metal support interactions are responsible for the increased methanol oxidation reaction (MOR) activity of Pt species with respect to the underlying SrRuO3 composite catalyst material.
机译：电极材料的性能传统的直接醇燃料电池(DAFC)受到(i)的低活动相对于整体催化剂材料成本,(2)中毒的活跃的网站部分氧化碳的存在物种(例如但不限于,甲酸,和醋酸)过程中产生的小分子氧化和(iii)催化的缺乏在底层的稳定性和耐久性商业碳的支持。选择,我们有合成各种金属氧化物和钙钛矿材料不同的大小和化学成分作为工党的支持纳米粒子(NPs)。独特的机械的研究证明SrRuO3与固定化Pt NPs在其基质表面显示最好的甲醇氧化与所有其他的性能衬底材料测试,包括商业碳本身。电子能量损失谱(鳗鱼)和x射线光电子能谱(XPS)确认电子转移的存在从PtNPs在SrRuO3表面俄文物种底物本身,从而暗示良好的金属交互的支持负责提高甲醇氧化Pt物种的反应(铁道部)活动对底层SrRuO3复合催化剂材料。

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