通过轻量化 W 的负电荷 Pt 显著增强进化反应活性
Daiya Kobayashi1,2, Hirokazu Kobayashi2, Dongshuang Wu2
1Nippon Soda Co. Ltd., Chiba Research Center, 12-54 Goi-minamikaigan, Ichihara, Chiba 290-0045, Japan.
Journal of the American Chemical Society
|September 30, 2020
概括
新型- (PtW) 固体溶液纳米粒子展示了破纪录的演化反应 (HER) 性能. 这些先进的催化剂为清洁生产提供了卓越的效率和稳定性.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 开发高效的电催化剂用于演化反应 (HER) 对可再生能源技术至关重要.
- 基于的材料具有高度活性但价格昂贵,推动了对替代合金和纳米结构的研究.
- 固体溶液合金具有独特的电子特性,可以增强催化活性.
研究的目的:
- 合成和描述新的- (PtW) 固体溶液纳米粒子 (NP).
- 评估PtWNP的HER性能,并将其与商业催化剂进行比较.
- 通过理论计算阐明 HER 活性增强的基本机制.
主要方法:
- 核心/外 PtW@WO3 NP 经过电化学清洗,产生了 PtW 固体溶液 NP.
- 通过电流密度和超电位来测量演变反应 (HER) 的性能.
- 在长时间运行过程中评估了电化学稳定性.
- 用密度函数理论 (DFT) 的计算来研究吸附能量.
主要成果:
- 已成功合成PtW固体溶液中的NP.
- PtW NPs实现了创纪录的HER性能,在19.4mV的超电位下达到10mA cm-2.
- 这种性能优于商业催化剂 (26.3 mV超电位).
- PtW的NP表现出很好的长期稳定性.
- 理论计算表明,与W原子相邻的负电荷的Pt原子促进了有利的吸附.
结论:
- PtW固体溶液NP代表了HER的高度活跃和稳定的电催化剂类.
- 这种增强的活性归因于PtW合金独特的电子结构所产生的有利的吸附能量.
- 这些发现为开发具有成本效益和高效的生产催化剂铺平了道路.
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