利用可再生能源将CO_(2)转化成高附加值的燃料或化学品,是一项实现“碳中和,碳达峰”的新资源化技术,但目前高性能电催化CO_(2)转化的催化剂研发,仍然是一项热点问题。设计具有“类珊瑚状”结构的多级孔氮掺杂碳气凝胶(N-CA)作为优化气...利用可再生能源将CO_(2)转化成高附加值的燃料或化学品,是一项实现“碳中和,碳达峰”的新资源化技术,但目前高性能电催化CO_(2)转化的催化剂研发,仍然是一项热点问题。设计具有“类珊瑚状”结构的多级孔氮掺杂碳气凝胶(N-CA)作为优化气体传质的碳载体,利用非共价固定技术,将酞菁钴(CoPc)稳定于气凝胶骨架的表面,以实现活性位点和导电碳骨架稳定结合。CoPc@N-CA展现出优异的电催化CO_(2)还原(CO_(2)RR)活性,在较宽的电势窗口-0.5~-1.0 V vs.RHE下,对CO的选择性>80%,最高为99.05%;在-0.85 V vs.RHE电位下,CoPc@N-CA对CO的部分电流密度达到14.40 mA·cm^(-2),约是以商业碳黑(CB)为基底设计的CoPc@CB(3.66·mA cm^(-2))催化剂的4倍。内在活性分析发现,CoPc@N-CA优异的活性可归因于N-CA独特的多孔结构,这不仅促进了CO_(2)分子的传质,有利于CO_(2)RR反应动力学,而且有利于暴露Co活性位点,从而促进CO_(2)RR。展开更多
A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR...A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR. The results showed that there were interactions between NiO and SiO2. But as nickel content increased, the interaction decreased. The nickel oxide in the catalysts appeared in different forms as nickel content was changed. When the content was less than 13%, Ni? entered into the SiO2 structure completely and it became clusters after calcining. If the content altered from 20% to 50%, NiO existed as both microcrystal and clusters, the later spices was dominating. However, when the content increased to 70%, microcrystal became the primary components.展开更多
文摘利用可再生能源将CO_(2)转化成高附加值的燃料或化学品,是一项实现“碳中和,碳达峰”的新资源化技术,但目前高性能电催化CO_(2)转化的催化剂研发,仍然是一项热点问题。设计具有“类珊瑚状”结构的多级孔氮掺杂碳气凝胶(N-CA)作为优化气体传质的碳载体,利用非共价固定技术,将酞菁钴(CoPc)稳定于气凝胶骨架的表面,以实现活性位点和导电碳骨架稳定结合。CoPc@N-CA展现出优异的电催化CO_(2)还原(CO_(2)RR)活性,在较宽的电势窗口-0.5~-1.0 V vs.RHE下,对CO的选择性>80%,最高为99.05%;在-0.85 V vs.RHE电位下,CoPc@N-CA对CO的部分电流密度达到14.40 mA·cm^(-2),约是以商业碳黑(CB)为基底设计的CoPc@CB(3.66·mA cm^(-2))催化剂的4倍。内在活性分析发现,CoPc@N-CA优异的活性可归因于N-CA独特的多孔结构,这不仅促进了CO_(2)分子的传质,有利于CO_(2)RR反应动力学,而且有利于暴露Co活性位点,从而促进CO_(2)RR。
文摘A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR. The results showed that there were interactions between NiO and SiO2. But as nickel content increased, the interaction decreased. The nickel oxide in the catalysts appeared in different forms as nickel content was changed. When the content was less than 13%, Ni? entered into the SiO2 structure completely and it became clusters after calcining. If the content altered from 20% to 50%, NiO existed as both microcrystal and clusters, the later spices was dominating. However, when the content increased to 70%, microcrystal became the primary components.
