化/氧化纳米板用于化中介增强吸附和化在酸盐电还原到氨的中
Zhencong Huang1, Baopeng Yang2, Yulong Zhou1
1School of Materials Science and Engineering, Central South University, Changsha 410083, China.
ACS nano
|December 6, 2023
概括
这项研究引入了一种新的氧化和氧化 (WN/WO3) 异构结构,通过电化学酸盐还原来实现高效的氨合成. WN/WO3材料显著增强了酸盐吸附和化,提高了氨生产产量.
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:
- 电化学酸盐还原反应 (NO3RR) 是可持续氨 (NH3) 合成的关键途径.
- 氧化 (WO3) 作为电催化剂具有前景,但其中间吸附能力较弱,化动力学较慢.
- 氧化酸中间体 (*NO3和*NO2) 的吸附和化是NO3RR在WO3上的关键瓶.
研究的目的:
- 设计和合成化和氧化 (WN/WO3) 异构结构,以增强NO3RR.
- 优化*NO3和*NO2中间体的吸附,并促进它们的化,以改善NH3的生产.
- 为了研究电化学NH3合成中的WN/WO3异构的结构-活性关系.
主要方法:
- 理论计算 (例如,密度函数理论) 来预测WN/WO3.3的电子结构和吸附特性.
- 通过高温化制造WN/WO3纳米板的制造.
- 使用传输电子显微镜 (TEM),X射线光电子光谱 (XPS) 和X射线吸收近边缘光谱 (XANES) 的表征.
- 电化学评估NH3生产使用技术,如在现场的里埃变换红外光谱 (在现场FTIR).
主要成果:
- 理论预测证实了WN/WO3异构结构上*NO3和*NO2的增强吸附,这是由于优化W-W距离和双联体形成.
- 成功合成了WN/WO3纳米片,呈现出一种复合异构结构,在现场引入了无形WN.
- 在NH3生产中,WN/WO3催化剂实现了高法拉第效率88.9±7.2%,产率为8.4 mg h-1 cm-2,优于单独的WO3和WN.
- 在现场FTIR证实了氧化介质的吸附和化比WN/WO3更好,与理论发现相一致.
结论:
- WN/WO3异构结构有效地解决了WO3的局限性,通过增强NO3RR的中间吸附和化动力学.
- 这项工作展示了设计先进纳米材料的简单策略,用于高效的电化学氨合成.
- 开发的WN/WO3异构结构为提高酸盐转化为氨的效率提供了一个有前途的平台.
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