调节d频段中心可使超细Pt3Fe合金纳米颗粒用于pH-通用进化反应
Panyong Kuang1, Zhenrui Ni1, Bicheng Zhu1
1Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, 68 Jincheng Street, Wuhan, 430078, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|July 1, 2023
概括
这项研究引入了一种新的电催化剂,Pt3Fe/NMCS-A,用于pH-通用演化反应 (HER). 这种催化剂在酸性,中性和性条件下表现出卓越的效率和稳定性.
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
- 催化剂是一种催化剂.
背景情况:
- 订序的金属间合金提供了双重活性点,可以协同加速H2O解离和H+减少,从而在pH-通用演变反应 (HER) 中获得高性能.
- 在所有pH值范围内开发高效稳定的HER电催化剂仍然是可再生能源技术的关键挑战.
研究的目的:
- 为了合成和表征活性化N-doped半孔碳球,支持金属间Pt3Fe合金 (Pt3Fe/NMCS-A) 作为pH-通用HER的高效电催化剂.
- 研究负责增强Pt3Fe/NMCS-A电催化剂的催化活性和稳定性的潜在机制.
主要方法:
- 合成N-doped介质碳球和随后加载金属间Pt3Fe合金.
- 电化学表征包括在各种电解质 (0.5M H2SO4,1.0M KOH,1.0M PBS) 中在10 mA cm-2的超电位测量.
- 理论计算 (密度函数理论) 以阐明电子相互作用和吸附能.
主要成果:
- 在10 mA cm-2下,Pt3Fe/NMCS-A表现出13 mV (酸性),29 mV (性) 和48 mV (中性) 的低超电位,证明了卓越的pH-通用HER性能.
- 催化剂表现出强大的稳定性,在长时间运行中保持其催化活性.
- 理论研究表明,Pt-Fe电子相互作用转移d频段中心,减少酸性介质中的H*吸附能量,并促进中性/性介质中的H2O解离.
结论:
- Pt3Fe/NMCS-A电催化剂对于pH-通用HER是非常有效的,因为Pt和Fe活性位点之间的协同作用.
- 合成策略是多功能性的,可以扩展到其他基于Pt的合金 (例如Pt3Co,Pt3Ni) 用于类似的应用.
- 这些发现凸显了以N-化中性碳为基础的基于Pt的金属间合金在实际生产中的巨大潜力.
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