Instant micro-arc oxidation constructing the ultrafine nanoparticles as high-performance catalyst and mechanism study

作者：Jun, Zhou^*; Cao, Xiaoqing; Yang, Xinyu; Wang, Zixuan; Wu, Xiaoying; Chen, Ping'an; Chen, Jing

来源：Materials Chemistry and Physics, 2023, 301: 127654.

DOI：10.1016/j.matchemphys.2023.127654

• Metal
• Nanoparticles
• Micro-arc intensity
• Hydrogen
• Catalyst

The instant synthesis of ultrafine, clean surface Ru nanoparticle (NP) catalysts embedded on a porous MgO support was achieved by instant micro-arc oxidation (IMAO). The high temperature from the micro-arc discharge facilitates the rapid decomposition of the catalyst precursor RuCl3 into homogeneous nanoparticles, while the fast quenching process ensures instantaneous encapsulation of the formed NPs by the MgO support. The obtained Ru/MgO catalyst exhibited attractive catalytic behaviour for sodium borohydride and ammonia borane hydro-lysis, with activities of 100,917 mL min(-1).g(-1) and 2336 mol min(-1).mol(-1), respectively. Moreover, this catalyst exhibited an excellent sintering resistance in high-temperature environment that was well retained after 40 cycles, indicating superior recyclability. This work provides a novel pathway for the direct and rapid synthesis of high-quality nanocatalyst and can be generalized to prepare other supported metal nanocatalyst (e.g. Pd/MgO).

• 单位
  北京大学; 东北大学