同一位置传输电子显微镜选择性Pt纳米催化剂的成像:电化学激活和表面干扰
Rosa M Arán-Ais1, Yingchao Yu, Robert Hovden
1Instituto de Electroquímica, Universidad de Alicante . Apdo 99, 03080, Alicante, Spain.
Journal of the American Chemical Society
|November 3, 2015
概括
电化学循环迅速降解六角纳米粒子,改变它们的形状并导致迁移. 这强调了在使用塑形纳米颗粒作为电催化剂时需要谨慎,特别是在减少氧的反应中.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 塑形纳米粒子是重要的电催化剂.
- 使用电化学循环来激活表面.
- 了解电化学条件下的纳米粒子稳定性至关重要.
研究的目的:
- 研究面积纳米颗粒的形态和形状变化.
- 评估电化学循环对纳米粒子稳定性的影响.
- 在电化学循环过程中评估纳米粒子迁移.
主要方法:
- 使用相同位置传输电子显微镜 (IL-TEM).
- 六边形纳米颗粒经过了高达1.3V的电化学循环.
主要成果:
- 在仅25个潜在循环后,观察到纳米粒子形状和形态的显著退化.
- 在500-1000个循环后发生了剧烈的降解.
- 在潜在循环过程中检测到粒子迁移的明显证据.
结论:
- 电化学循环,特别是在高正电位下,迅速降解成形的纳米粒子.
- 粒子迁移是循环过程中的一个显著现象.
- 在使用塑形纳米颗粒作为电催化剂时,特别是在氧降解反应中,需要小心.
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