Preparation and methane adsorption of two-dimensional carbide Ti₂C

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• 作者：Fanfan Liu ; Aiguo Zhou ; Jinfeng Chen ; Heng Zhang ; Jianliang Cao ; Libo Wang…
• 关键词：2D materials ; Raman spectrum ; Adsorption ; Methane
• 刊名：Adsorption
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：22
• 期：7
• 页码：915-922
• 全文大小：1,103 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Surfaces and Interfaces and Thin Films
  Industrial Chemistry and Chemical Engineering
  Engineering Thermodynamics and Transport Phenomena
  
• 出版者：Springer Netherlands
• ISSN：1572-8757
• 卷排序：22

文摘

Here a novel material for methane adsorption was synthesized and studied, which is a graphene-like two-dimensional (2D) carbide (Ti₂C, a member of MXenes), formed by exfoliating Ti₂AlC powders in a solution of lithium fluoride (LiF) and hydrochloric acid (HCl) at 40 °C for 48 h. Based on first-principles calculation, theoretically perfect Ti₂C with O termination has a specific surface area (SSA) of 671 m2 g−1 and methane storage capacity is 22.9 wt%. Experimentally, 2.85 % exfoliated Ti₂C with mesopores shown methane capacity of 11.58 cm3 (STP: 0 °C, 1 bar) g−1 (0.82 wt%) under 5 MPa and the SSA was 19.1 m2 g−1. For Ti₂C sample intercalated with NH₃·H₂O, the adsorbed amount was increased to 16.81 cm3 (STP) g−1 at same temperature. At the temperature of 323 K, the adsorbed amount of as-prepared Ti₂C was increased to 52.76 cm3 (STP) g−1. For fully exfoliated Ti₂C, the methane capacity was supposed to be 28.8 wt% or 1148 V (STP)v−1. Ti₂C theoretically has much larger volume methane capacity than current methane storage materials, though its SSA is not very high.