Interface electron collaborative migration of Co–Co3O4/carbon dots: Boosting the hydrolytic dehydrogenation of ammonia borane

An Improved Synthesis of Water-Soluble Dual Fluorescence Emission Carbon Dots from Holly Leaves for Accurate Detection of Mercury Ions in Living Cells

“…Carbon dots (CDs), a novel kind of carbon fluorescent materials with particle size less than 10 nm, have good water solubility, low toxicity, excellent biocompatibility, remarkable photostability, high fluorescence quantum yield and facile surface functionalization. 1 , 2 They are advantageous both in their wide range of carbon sources and simple green synthesis methods, which make them receive particular attention for diverse applications such as catalysis, 3 , 4 bioimaging, biosensors, 5 drug delivery, 6 diagnosis and treatment of diseases. 7 , 8 …”

Carbon dots-confined CoP-CoO nanoheterostructure with strong interfacial synergy triggered the robust hydrogen evolution from ammonia borane

“…This is superior to almost all reported non-noble-metal catalysts and even some noble metal catalysts (Table S3). Compared with Co/NCDs, the metal nanoheterostructure within Co-Co 3 O 4 /NCDs and CoP-CoO/NCDs improved their catalytic activities [12]. The outstanding performance of CoP-CoO/NCDs indicates that the novel two-phase heterostructure of CoP and CoO is particularly advantageous for AB hydrolysis, which could occur at different temperatures (Fig.…”

“…However, the current best catalysts contain Pt or Ru [9][10][11], the high cost and limited reserves of which greatly inhibit large-scale use. Therefore, the development of highly active and stable non-noble-metal catalysts, including oxides [12,13], sulfides [14], carbides [15] and phosphides [16,17], is crucial to AB becoming a widely used storage material. Transition-metal phosphides can efficiently catalyse hydrogen evolution, owing to their similarity to hydrogenase [18,19], but are limited by low reactivity and poor cyclic stability.…”

“…The rapid hydrolysis of AB on a suitable metal catalyst progresses first with the adsorption of water and AB molecules (i.e., reactants) at catalytic active sites. Their subsequent dissociation forms various reaction intermediates (e.g., BH 3 OH*, BH 2 (OH) 2 *, and BH(OH) 3 *), which go on to generate and release H 2 (see Table S1 in the Electronic Support Information (ESI)) [12,16,18,22]. The main rate-determining step is the dissociation of water and AB molecules, and reducing its energy barrier is crucial for improving hydrogen evolution efficiency [22,23].…”

Hydrolytic dehydrogenation of NH3BH3 catalyzed by ruthenium nanoparticles supported on magnesium–aluminum layered double-hydroxides

“…[2][3][4] Among many chemical hydrides, ammonia borane (AB, NH 3 BH 3 ) has recently attracted considerable attention as a potential hydrogen storage material due to its extremely high hydrogen content (19.6 wt%), low molecular weight (30.86 g mol À1 ), and environmentally friendly nature. [5][6][7][8][9][10][11][12] Hydrogen can be released from AB by thermolysis or solvolysis in the presence of suitable catalysts. 13 However, the former process has some drawbacks: (i) it requires a very long induction time and high temperature for complete hydrogen release, and (ii) various by-products, such as ammonia (NH 3 ) and borazine (B 3 N 3 H 6 ), can be formed during reaction for releasing hydrogen.…”