光化学工程不和的Pt岛屿在支持的Pd纳米晶体上,以获得强大的pH-通用进化反应
Yidan Liu1,2, Nuttapon Yodsin3, Ting Li1,4
1Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, P. R. China. shiliyi@shu.edu.cn.
Materials horizons
|February 13, 2024
概括
本研究介绍了一种光化学方法,用于创建-异构的纳米晶体,以实现高效的进化反应. 优化的Pd7@Pt3纳米晶体在各种pH水平上表现出卓越的性能,突出了它们的催化潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术 纳米技术
背景情况:
- 开发用于演化反应 (HER) 的高效电催化剂对于清洁能源技术至关重要.
- 对HER而言,对异构纳米晶体 (HNC) 的可控合成仍然是一个重大挑战.
研究的目的:
- 开发一种光化学沉积策略,用于合成可控制的- (Pd@Pt) 核心外HNC.
- 研究这些HNC的结构-活动关系,以提高HER的性能.
主要方法:
- 光化学沉积合成Pd@Pt核心外HNCs与可调节的Pt外生长.
- 电化学表征用于评估HER在广泛的pH范围 (酸性,中性,性) 的性能.
- 密度函数理论 (DFT) 计算以阐明增强活动的机制.
主要成果:
- 实现了具有不同 Pt 形态的 Pd@Pt HNC 的可控合成.
- 通过斯特兰斯基-克拉斯塔诺夫生长合成的Pd7@Pt3 HNCs在各种电解质中表现出色的HER性能 (低超电位33,18,49mV).
- 证明了0.021 mg cm-2的低催化剂负荷,以达到10 mA cm-2的电流密度.
- DFT的计算证实,Pt岛上的不和协调站点是加强HER活动的关键.
结论:
- 光化学沉积策略可以合理设计和合成高效的HER电催化剂.
- Pd7@Pt3 HNCs在广泛的pH范围内表现出强大而优异的HER活性,这归因于特定的结构特征.
- 这种方法为开发用于能源应用的先进异构催化剂提供了一个有希望的途径.
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