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首页> 外文期刊>ACS applied materials & interfaces >Novel Au Catalysis Strategy for the Synthesis of Au@Pt Core-Shell Nanoelectrocatalyst with Self-Controlled Quasi-Monolayer Pt Skin
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Novel Au Catalysis Strategy for the Synthesis of Au@Pt Core-Shell Nanoelectrocatalyst with Self-Controlled Quasi-Monolayer Pt Skin

机译：具有自控准单层PT皮肤的Au @ Pt核心壳纳米电催化剂合成的新型Au催化策略

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摘要

Design of catalytically active Pt-based catalysts with minimizing the usage of Pt is a major issue in fuel cells. Herein, for the first time, we have developed a Au catalytic reduction strategy to synthesize a Au@Pt core-shell electrocatalyst with a quasi-monolayer Pt skin spontaneously formed from the gold surface catalysis. In the presence of presynthesized gold nanocrystals (used as the catalyst and Au seeds) and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid buffer (used as reductant), under the Au surface catalysis, platinum ions can be reduced and deposited on the gold nanocrystals to form a Pt skin surface with a quasi-monatomic thickness. In the present strategy, Pt ions can be reduced only under the catalysis of gold surface and thus when the surface of Au NPs is covered by a monatomic Pt layer, the reduction reaction of Pt ions will be spontaneously turned off. Therefore, the significant advantage of this synthesis strategy is that the formation of quasi-monolayer Pt skin surface can be self-controlled and is completely free of controlling the dosage of platinum ions and the size distribution of Au cores. The synthesized Au@Pt core@shell structure exhibited enhanced electrocatalytic activities for oxygen reduction reaction and methanol oxidation reaction, which are 6.87 and 10.17 times greater than those of Pt/ C catalyst, respectively. The present study provides a new strategy for obtaining high-performance bimetallic/multimetallic electrocatalysts with high utilization of precious metals.
机译：催化活性Pt基催化剂的设计，最小化Pt的使用是燃料电池中的主要问题。在此，我们首次开发了一种Au催化还原策略，以将Au @ Pt核 - 壳电催化剂用由金表面催化自发形成的准单层Pt皮肤合成。在存在未加工的金纳米晶体（用作催化剂和Au种子）和4-（2-羟乙基）-1-哌嗪甲磺酸缓冲液（用作还原剂）下，在Au表面催化下，可以减少并沉积铂离子金纳米晶体以拟原料厚度形成Pt皮肤表面。在本发明的策略中，Pt离子可以仅在金表面的催化下减少，因此当通过单独的孔隙层覆盖Au nps的表面时，Pt离子的还原反应将自发地关闭。因此，该合成策略的显着优点是，组合型PT皮肤表面的形成可以是自控的，并且完全没有控制铂离子的剂量和Au芯的尺寸分布。合成的Au @ Pt核心@壳结构表现出增强的氧还原反应和甲醇氧化反应的电催化活性，分别比Pt / C催化剂的6.87和10.17倍。本研究提供了一种具有高效利用贵金属的高性能双金属/多金属电催化剂的新策略。

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  • 来源
    《ACS applied materials & interfaces》 |2017年第38期|共10页
  • 作者

    Zhang Youlin; Li Xiaokun; Li Kai; Xue Bin; Zhang Chunmei; Du Cheng; Wu Zhijian; Chen Wei;

  • 作者单位

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Electroanalyt Chem Changchun 130022 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Electroanalyt Chem Changchun 130022 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Rare Earth Resource Utilizat Changchun 130022 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Opt Fine Mech &

    Phys State Key Lab Luminescence &

    Applicat Changchun 130033 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Electroanalyt Chem Changchun 130022 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Electroanalyt Chem Changchun 130022 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Rare Earth Resource Utilizat Changchun 130022 Jilin Peoples R China;

    Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Electroanalyt Chem Changchun 130022 Jilin Peoples R China;

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

    electrocatalyst; catalytic reduction strategy; Pt skin; oxygen reduction reaction; methanol oxidation reaction;

    机译：电催化剂;催化还原策略;Pt皮;氧还原反应;甲醇氧化反应;

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