单面碳纳米管中单维碳纳米管的异型生长,具有强烈的催化作用
Kun Wang1, Guang-Jie Xia1,2, Tianhui Liu1
1Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China.
Journal of the American Chemical Society
|May 8, 2023
概括
在单壁碳纳米管 (SWCNT) 中合成了超薄的和化碳纳米线. 这种新的方法可以精确控制碳化物结构,并提高半化的催化性能.
科学领域:
- 材料科学
- 纳米技术
- 催化剂
背景情况:
- (W) 和 (Mo) 碳化物对催化和超导具有前景.
- 合成具有可控尺寸和结构的超薄W/Mo碳化物仍然具有挑战性.
研究的目的:
- 开发一种在SWCNT中合成超薄W/Mo碳化物纳米线的方法.
- 研究这些新材料的结构,电子和催化性能.
主要方法:
- 使用单壁碳纳米管 (SWCNT) 作为模板的宿主-客组装策略.
- 在SWCNT中封装W/Mo聚氧金属,然后进行碳热还原.
- 原子分辨率电子显微镜,光谱和理论计算.
- 使用Pd催化剂选择性半化中的应用.
主要成果:
- 在SWCNT中成功合成了超薄 (0.8-2.0 nm) 的W2C和Mo2C纳米线.
- 由于强烈的W/Mo-SWCNT相互作用,碳化物纳米线的异型增长已被证明,导致晶格应变和电子捐赠.
- SWCNT模板提供了H2O对碳化物的耐腐蚀性.
- M2C@SWCNTs (M=W,Mo) 促进了均的Pd催化剂结构,抑制了PdH的形成,并实现了高度选择性的半化.
结论:
- 主机-客户战略提供了一种非破坏性的途径,用于在SWCNT中合成异型超薄碳化物纳米线.
- 这种方法可以精确地控制材料特性,并扩展1D超薄碳友金属纳米线的合成方法.
- 由此产生的M2C@SWCNT复合材料显示出高度选择性的催化应用的巨大潜力.
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