原子金属支相互作用使得无重建的双位电催化剂
Huachuan Sun1, Ching-Wei Tung2, Yang Qiu3
1School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Journal of the American Chemical Society
|December 22, 2021
概括
这项研究引入了一种稳定的双功能电催化剂,用于和氧的演化反应. 在-层的双氧化物上的原子可以防止结构变化,从而使水分高效且持久.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 真正的双功能电催化剂必须在演化反应 (HER) 和氧演化反应 (OER) 中保持结构完整性.
- 许多双功能催化剂经历不可逆转的结构转变或表面重建,作为前催化剂而不是真正的催化剂.
- 开发稳定的电催化剂对于高效和长期的水分应用至关重要.
研究的目的:
- 为 HER 和 OER 设计和合成一个稳定的单原子分散催化剂.
- 研究原子在电化学反应中稳定催化剂结构的作用.
- 与现有的双功能催化剂相比,证明拟议的催化剂的性能和稳定性优越.
主要方法:
- 在-层双氧化物 (LDH) 支架上合成单原子分散的.
- 使用X射线吸收光谱和操作拉曼光谱来研究催化剂的行为.
- 电化学测试以评估演变反应 (HER) 和氧演变反应 (OER) 的活动.
主要成果:
- 原子装饰的Ni-V LDH催化剂表现出优异的HER和OER活动.
- 在现场和操作的光谱证实原子Ru稳定了Ni-V LDH表面,防止重建.
- 和Ni-V之间的强烈金属支相互作用稳定了活性部位,在HER期间允许稳定的氧化状态,并在OER期间提高耐受性.
- 在水分裂周期中,Ru/Ni3V-LDH催化剂显示稳定的双反应点,没有结构降解.
结论:
- 由于其稳定结构和双活性位点,开发的Ru/Ni3V-LDH作为真正的双功能电催化剂.
- 强大的金属支相互作用是实现无重建表面和高催化活性水分裂的关键.
- 这项工作为设计可持续能源应用的强大的双功能电催化剂提供了新策略.
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