Hybrid effects in graphene oxide/carbon nanotube-supported layered double hydroxides: enhancing the CO2 sorption properties
Hybrid effects in graphene oxide/carbon nanotube-supported layered double hydroxides: enhancing the CO2 sorption properties
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DOI：
10.1016/j.carbon.2017.07.094
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发表时间：
2017-10-01
期刊：
影响因子：
10.9
通讯作者：
Shaffer, Milo S. P.
中科院分区：
文献类型：
--
作者：
De Marco, Martina;Menzel, Robert;Shaffer, Milo S. P.
氧化石墨烯（GO）和多壁碳纳米管（MWCNT）先前已经独立地用作层状双氢氧化物（LDH）的活性载体，并且发现其增强固有的CO2吸附能力。然而，经受变温吸附（TSA）循环的材料的长期稳定性仍然需要改进。在该贡献中，GO和MWCNT被杂化以产生具有改进的表面积的混合基底，并且与单独的任一相相比，对于随后的LDH片晶沉积具有相容性。并入稳健且彻底杂化的碳网络显著增强了活化的、促进的LDH在二十个气体吸附-解吸循环中的热稳定性（在第20个循环时初始吸附容量的96%保留），显著减少了先前在单独添加GO或MWCNT时观察到的烧结。详细表征的负载型LDH的形态，在多晶吸附过程的几个阶段，表明吸附剂的初始形态更强烈地保留时，支持在强大的混合GO/MWCNT网络;的CO2吸附性能密切相关的吸附剂的比表面积，在1：1的比例GO：MWCNT基板的小负载量都最大化。(C)2017由Elsevier Ltd.出版
Graphene oxide (GO) and multi-walled carbon nanotubes (MWCNT) have been previously used independently as active supports for layered double hydroxides (LDH), and found to enhance the intrinsic CO2 sorption capacity. However, the long-term stability of the materials subjected to temperature-swing adsorption (TSA) cycles still requires improvement. In this contribution, GO and MWCNT are hybridized to produce mixed substrates with improved surface area, and compatibility for the subsequent deposition of LDH platelets, compared to either phase alone. The incorporation of a robust and thoroughly hybridized carbon network considerably enhances the thermal stability of activated, promoted LDH over twenty cycles of gas adsorption-desorption (96% of retention of the initial sorption capacity at the 20th cycle), dramatically reducing the sintering previously observed when either GO or MWCNT were added separately. Detailed characterization of the morphology of the supported LDH, at several stages of the multicycle adsorption process, shows that the initial morphology of the adsorbents is more strongly retained when supported on the robust hybrid GO/MWCNT network; the CO2 adsorption performance correlates closely with the specific surface area of the adsorbents, with both maximized at small loadings of a 1: 1 ratio GO: MWCNT substrate. (C) 2017 Published by Elsevier Ltd.