• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Seed-mediated synthesis of Au@PtCu nanostars with rich twin defects as efficient and stable electrocatalysts for methanol oxidation reaction
【24h】

Seed-mediated synthesis of Au@PtCu nanostars with rich twin defects as efficient and stable electrocatalysts for methanol oxidation reaction

机译：种子介导的Au @ ptcu纳米蛋白的合成，具有富含双缺陷的甲醇氧化反应的高效稳定的电催化剂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pt-based nanocrystals with a twinned structure are highly desirable to achieve high performances in both catalytic activity and durability for methanol oxidation reaction (MOR). However, it still remains great challenge for producing such twinned nanocrystals due to the high internal strain energy of Pt. Here we present a seed-mediated approach to generate Au@PtCu nanostars with a five-fold twinned structure using Au decahedra as seeds. The composition of Pt/Cu in the nanocrystals was tuned by varying the molar ratio of Pt to Cu salt precursors with the amount of Au seeds being the same. Through composition optimization, Au@Pt1.2Cu nanostars achieved the highest specific (1.06 mA cm(-2)) and mass (0.18 mA mg(Pt)(-1)) activities for MOR, which were about 5.9 and 1.6 times higher than those of commercial Pt/C, respectively. After accelerated stability test (ADT) for 1500 cycles, such nanostars remained similar to 95% of specific activity compared to a loss of similar to 28% for commercial Pt/C, indicting their superior durability for MOR. We believed that this enhancement may arise from the unique twinned structure and possible synergetic effect between Pt and Cu components.
机译：具有孪晶结构的Pt基纳米晶体非常希望在催化活性和耐甲醇氧化反应（Mor）的耐久性中实现高性能。然而，由于Pt的高内部应变能量，它仍然仍然是生产这种孪生纳米晶体的挑战。在这里，我们提出了一种种子介导的方法，用于使用Au Decahedra作为种子，用五倍的孪晶结构产生Au @ ptcu纳米杆菌。通过将Pt与Cu盐前体的摩尔比改变为相同的量来调节纳米晶体中的Pt / Cu的组合物。通过组成优化，Au@pt1.2cu antars实现了最高的特异性（1.06 mA cm（-2））和mor的质量（0.18 mA mg（pt）（ - 1））的活动，比高于5.9％和1.6倍商业Pt / c的那些。在加速稳定性试验（ADT）持续1500次循环后，与商业PT / C类似于28％的损失相比，这种纳米稳定率类似于95％的特异性活性，使其对Mor的优越耐久性相比。我们认为，这种增强可能来自独特的孪晶结构和Pt和Cu组分之间可能的协同作用。

著录项

  • 来源
    《RSC Advances》 |2019年第61期|共8页
  • 作者

  • 作者单位
  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号