在TiO2上支持单原子Ni,用于MgH2中的催化存储
Jiyue Zhang1, Wenda Wang1, Xiaowei Chen2
1School of Energy and Power Engineering, Beihang University, Beijing 100191, China.
Journal of the American Chemical Society
|March 18, 2024
概括
这项研究在二氧化 (TiO2) 上引入了一种新的单原子催化剂,以增强化 (MgH2) 的储存. 催化剂显著改善了清洁能源应用中的释放和吸收动力学和稳定性.
科学领域:
- 材料科学
- 能量储存
- 催化剂
背景情况:
- 是重要的清洁能源载体, 但安全的高密度储存仍然是一个挑战.
- 化 (MgH2) 具有较高的容量,但其动力学较慢,限制了实际使用.
- 单原子催化剂增加了活性, 但面临热稳定性问题.
研究的目的:
- 开发一个热稳定的单原子催化剂,以改善MgH2储存.
- 在TiO2上研究单原子对MgH2动力学的催化机制.
- 评估开发的存材料的长期性能和效率.
主要方法:
- 合成单原子负荷TiO2 (Ni@TiO2) 催化剂.
- 催化剂的结构,热稳定性和催化活性.
- 化/脱循环测试以评估储能和动力学.
- 激活能量减少和催化机制的分析.
主要成果:
- 优化的15wt%-Ni0.034@TiO2催化剂降低了MgH2脱的开始到200°C.
- 在300°C下快速释放 (在5分钟内4.6%) 和吸收 (在300°C下在10秒内6.53%).
- 明显的激活能量降至64.35kJ/mol (脱) 和35.17kJ/mol (化).
- 在100个循环后观察到97.26%的异常容量保留.
结论:
- 单原子Ni@TiO2表现出优越的热稳定性和MgH2储物的催化活性.
- 在TiO2中,单原子Ni,氧空位和Ti物种之间的协同作用增强了动力学.
- 这项工作显示出一个有前途的储材料和高温单原子催化方法.
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