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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Optimizing Formic Acid Electro-oxidation Performance by Restricting the Continuous Pd Sites in Pd-Sn Nanocatalysts
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Optimizing Formic Acid Electro-oxidation Performance by Restricting the Continuous Pd Sites in Pd-Sn Nanocatalysts

机译：通过限制PD-SN纳米催化剂中的连续PD位点优化甲酸电氧化性能

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摘要

Bimetallic Pd-based electrocatalysts usually show enhanced activity toward the formic acid oxidation reaction (FAOR), while the ensemble effects on FAOR are less investigated compared with the electronic effects. Here, a series of Pd-Sn nanocatalysts with an Sn/SnO x -enriched surface are prepared via a facile method. The apparent FAOR performance is mainly determined by the inhibiting effect of tensile strains caused by lattice expansion and promoting effect of ensemble effects through restricting the continuous Pd sites. All the Pd-Sn alloys show enhanced specific activities, indicating that the ensemble effects play a main role in promoting the FAOR performance. The inhibiting effect of tensile strains results in a volcanic-type relationship between the specific activity and strains. The enhancement in stability shows a similar trend as revealed by the chronoamperometry and carbon monoxide (CO) stripping results. Both the improved FAOR activity and stability on Pd-Sn nanocatalysts could be attributed to the reason that the binding strength of adsorbed formate and CO on discontinuous Pd sites was much weaker than that on continuous Pd sites. This work suggests that restricting the continuous Pd sites through ensemble effects is an effective strategy to promote the FAOR performance of Pd-based electrocatalysts.
机译：基于双金属Pd的电催化剂通常显示出富含甲酸氧化反应的增强活性（饲养员），而与电子效应相比，对饲料的集合效果较小。这里，通过容易方法制备一系列具有Sn / SnO X-enRiched表面的PD-Sn纳米催化剂。表观派生性能主要由晶格膨胀引起的拉伸菌株抑制作用通过限制连续的Pd位点引起晶格膨胀和促进集合效应的影响。所有PD-SN合金都显示出增强的特定活动，表明集合效应在促进粮农组织绩效方面发挥了主要作用。拉伸菌株的抑制作用导致特异性活性和菌株之间的火山型关系。稳定性的增强显示了时计量和一氧化碳（CO）剥离结果所揭示的类似趋势。 PD-Sn纳米催化剂的改善的酵母活性和稳定性既可能归因于甲酸甲酸甲酸酯和CO在不连续PD位点上的结合强度比连续Pd位点上的结合强度大得多。这项工作表明，通过集合效应限制连续的PD位点是促进PD基电催化剂的粮食园的表现的有效策略。

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  • 来源
  • 作者

    Shen Tao; Lu Yun; Gong Mingxing; Zhao Tonghui; Hu Yezhou; Wang Deli;

  • 作者单位

    Huazhong Univ Sci &

    Technol Key Lab Mat Chem Energy Convers &

    Storage Hubei Key Lab Mat Chem &

    Serv Failure Minist Educ Sch Chem &

    Chem Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Key Lab Mat Chem Energy Convers &

    Storage Hubei Key Lab Mat Chem &

    Serv Failure Minist Educ Sch Chem &

    Chem Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Key Lab Mat Chem Energy Convers &

    Storage Hubei Key Lab Mat Chem &

    Serv Failure Minist Educ Sch Chem &

    Chem Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Key Lab Mat Chem Energy Convers &

    Storage Hubei Key Lab Mat Chem &

    Serv Failure Minist Educ Sch Chem &

    Chem Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Key Lab Mat Chem Energy Convers &

    Storage Hubei Key Lab Mat Chem &

    Serv Failure Minist Educ Sch Chem &

    Chem Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Key Lab Mat Chem Energy Convers &

    Storage Hubei Key Lab Mat Chem &

    Serv Failure Minist Educ Sch Chem &

    Chem Engn Wuhan 430074 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    formic acid oxidation; electrocatalysts; ensemble effects; electronic effects; conformation;

    机译：甲酸氧化;电催化剂;合奏效果;电子效果;构象;

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