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进化电催化剂设计:通过原子精确纳米化学将惰性黄金转化为活性催化剂

Yingwei Li1, Site Li1, Anantha V Nagarajan2

  • 1Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.

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概括

我们开发了一种新的硫酸盐保护的金银纳米聚合物 (Au36Ag2(SR) 18),能有效催化进化反应 (HER). 这种纳米集群由于其独特的结构和较低的配体覆盖率,显示出增强的活性,为可再生能源提供了有前途的战略.

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科学领域:

  • 材料科学
  • 纳米技术
  • 电化学

背景情况:

  • 晶金 (Au) 和银 (Ag) 是低效的演化反应 (HER) 的催化剂.
  • 体纳米颗粒上的配体通常会阻碍催化活性.

研究的目的:

  • 报告一种新型的受酸盐保护的Au36Ag2(SR) 18纳米集群,用于有效的HER催化.
  • 研究一系列Au纳米集群中的结构活动关系.

主要方法:

  • 用酸盐保护的Au36Ag2(SR) 18纳米集群的合成.
  • 电催化试验 HER.
  • 密度函数理论 (DFT) 的计算.

主要成果:

  • 在较低的超电位下,Au36Ag2(SR) 18具有较高的HER活性.
  • 它的活性明显高于Au25(SR) 18-和Au38(SR) 24纳米集群.
  • DFT计算表明Au36Ag2 ((SR) 18) 的结能更低,电子亲和力更高.

结论:

  • Au36Ag2(SR) 18纳米团的效率源于低联体覆盖率,低协调的Au原子和未填充的超原子轨道.
  • 这项工作介绍了使用具有控制结构的原子精确纳米集群从惰性金属制造活性催化剂的策略.