Effect of Few-Layer Ti3C2T x Supported Nano-Ni via Self-Assembly Reduction on Hydrogen Storage Performance of MgH2

• Published in: ACS applied materials & interfaces 2020-10, Vol.12 (42), p.47684-47694
• Main Authors: Gao, Haiguang, Shao, Yuting, Shi, Rui, Liu, Yana, Zhu, Jinglian, Liu, Jiangchuan, Zhu, Yunfeng, Zhang, Jiguang, Li, Liquan, Hu, Xiaohui
• Format: Article
• Language: English
• Subjects: Energy, Environmental, and Catalysis Applications
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.0c15686

For the first time, few-layer Ti3C2T x (FL-Ti3C2T x ) supporting highly dispersed nano-Ni particles with an interconnected and interlaced structure was elaborated through a self-assembly reduction process. FL-Ti3C2T x not only acts as a supporting material but also self-assembles with Ni2+ ions through the electrostatic interaction, assisting in the reduction of nano-Ni. After ball milling with MgH2, Ni30/FL-Ti3C2T x (few-layer Ti3C2T x supported 30 wt % nano-Ni via self-assembly reduction) shows superior catalytic activity for MgH2. For example, MgH2-5 wt % Ni30/FL-Ti3C2T x can release approximately 5.83 wt % hydrogen within 1800 s at 250 °C and absorb 5 wt % hydrogen within 1700 s at 100 °C. The combined effects of finely dispersed nano-Ni in situ-grown on FL-Ti3C2T x , large specific area of FL-Ti3C2T x , multiple-valence Ti (Ti4+, Ti3+, Ti2+, and Ti0) derived from FL-Ti3C2T x , and the electronic interaction between Ni and FL-Ti3C2T x can explain the superb hydrogen storage performance. Our results will attract more attention to the elaboration of the metal/FL-Ti3C2T x composite via self-assembly reduction and provide a guideline to design high-efficiency composite catalysts with MXene in hydrogen storage fields.