Hydrogen Generation upon Nanocatalyzed Hydrolysis of Hydrogen-Rich Boron Derivatives: Recent Developments

• DOI: 10.1021/acs.accounts.0c00525
• Publication Date: 2020-10-09T12:31:26Z
• Authors: Changlong Wang; Qi Wang; Fangyu Fu; Didier Astruc
• Keywords: Ammonia Borane; Nanomaterial-based catalyst

ConspectusProduction of hydrogen from nonfossil sources is essential toward the generation sustainable energy. Hydrogen upon hydrolysis stable hydrogen-rich materials has long been proposed as a possibility disposal on site, because transport explosive gas dangerous. Hydrolysis some boron derivatives could rapidly produce large amounts hydrogen, but this requires presence very active catalysts. Indeed, late transition-metal nanocatalysts have recently developed for few precursors.Our research group focused improvement and optimization highly performing Earth-abundant transition-metal-based nanocatalysts, remarkable synergies between different metals in nanoalloys, supports including positive synergy with nanoparticles (NPs) rapid generation, comparison various endo- or exoreceptors working homogeneous heterogeneous supports, mechanistic research, nanocatalyzed several hydrides.First, production ammonia borane, AB (3 mol H2 per AB) was examined endoreceptors. Thus, Ni@ZIF-8 nanocatalyst found to be superior over other supports. With 85.7 molH2·molcat-1·min-1 at 25 °C, Ni surpassed results previous nanocatalysts. The NaOH accelerated reaction, pH-dependent "on-off" control established. Bimetallic nanoalloys Ni-Pt@ZIF-8 showed dramatic volcano effect optimized nanoalloy containing 2/3 1/3 Pt. rate reached 600 2222 molH2·molPt-1·min-1 20 which much overtook performances both related Pt@ZIF-8. Next, also researched via sodium borohydride (4 NaBH4) using ZIF-8, and, among Co@ZIF-8 best performance, outperforming Co For exoreceptors, "click" dendrimers triazole ligands their tripodal tethers were used (semiheterogeneous) catalysis NaBH4 hydrolysis. reactions, metal, Pt noble Co1Pt1 nanoalloy, synergistic effects. Based kinetic measurements isotope effects all these mechanisms are produced further tandem reactions. Overall, triple components allowed release within seconds under ambient conditions. These improvements findings should inspire design areas production.