Affiliation of Author(s):[1]Univ Elect Sci & Technol China, State Key Lab Elect Thin Film & Integrated Device, Sch Elect Sci & Engn, Chengdu 611731, Sichuan, Peoples R China;[2]Univ Elect Sci & Technol China, Yangtze Delta Reg Inst Huzhou, Huzhou 313001, Zhejiang, Peoples R China;[3]Army Logist Acad PLA, Dept Petr Oil & Lubricants, Chongqing 401331, Peoples R China;[4]Univ Elect Sci & Technol China, Sch Phys, Chengdu 611731, Sichuan, Peoples R China;[5]Nanjing Univ, Sch Elect Sci & Engn, Res Inst Superconductor Elect, Nanjing 210023, Peoples R China
Journal:NATURE COMMUNICATIONS
Abstract:A major challenge for the effective use of Ti-based MXenes in applications with harsh environmental conditions is their poor resistance to oxidation. Here, authors report an air-stable Ti3C2Tx composite with extracted bentonite able to endure high-temperature annealing in air by an oxygen adsorption competition mechanism. Although Ti3C2Tx MXene is a promising material for many applications such as catalysis, energy storage, electromagnetic interference shielding due to its metallic conductivity and high processability, it's poor resistance to oxidation at high temperatures makes its application under harsh environments challenging. Here, we report an air-stable Ti3C2Tx based composite with extracted bentonite (EB) nanosheets. In this case, oxygen molecules are shown to be preferentially adsorbed on EB. The saturated adsorption of oxygen on EB further inhibits more oxygen molecules to be adsorbed on the surface of Ti3C2Tx due to the weakened p-d orbital hybridization between adsorbed O-2 and Ti3C2Tx, which is induced by the Ti3C2Tx/EB interface coupling. As a result, the composite is capable of tolerating high annealing temperatures (above 400 degrees C for several hours) both in air or humid environment, indicating highly improved antioxidation properties in harsh condition. The above finding is shown to be independent on the termination ratio of Ti3C2Tx obtained through different synthesis routes. Utilized as terahertz shielding materials, the composite retains its shielding ability after high-temperature treatment even up to 600 degrees C, while pristine Ti3C2Tx is completely oxidized with no terahertz shielding ability. Joule heating and thermal cycling performance are also demonstrated.
Document Type:Article
Volume:13
Issue:1
ISSN No.:20411723
Translation or Not:no