2024级博士生刘卫红在Surfaces and Interfaces发表论文“Ultrasound-assisted synthesis of highly dispersed nickel nanoclusters on MXene for efficient dehydrogenation of hydrazine borane”。
摘要：
Hydrazine borane (N2H4BH3), recognized as an excellent hydrogen source, has received widespread attention due to its good chemical stability and superior gravimetric hydrogen storage capacity. However, developing monodispersed and ultrafine noble-metal-free nanocatalysts to enhance hydrogen generation from N2H4BH3 is vital yet challenging. In this work, we proposed an ultrasound-assisted synthesis approach to prepare highly dispersed Ni nanoclusters (NCs, ∼1.9 nm) on Ti3C2Tx MXene. The ultrasound-induced oxygen-containing functional groups on the Ti3C2Tx MXene surface can regulate the size and dispersion of Ni particles. The as-prepared Ni/Ti3C2Tx exerts superior catalytic performance and 100% H2 selectivity toward hydrogen production from the aqueous solution of N2H4BH3. Its turnover frequency (TOF) value reaches 302 h−1 at 323 K, which is 6 times higher than that of Ni/Ti3C2Tx prepared without ultrasound treatment and even exceeds almost all previously reported monometallic noble-metal-free catalysts. The superior catalytic efficiency of Ni/Ti3C2Tx is attributed to the highly dispersed and electron-rich Ni NCs, as well as the electronic metal-support interaction (EMSI) between the Ti3C2Tx MXene support and the Ni NCs. Highly active and affordable catalysts provide an effective approach to boost N2H4BH3 as a promising hydrogen storage material in practical application.