Catalytic Hydrolysis of Sodium Borohydride for Hydrogen Production Using Magnetic Recyclable CoFe₂O₄-Modified Transition-Metal Nanoparticles

Abstract

Sodium borohydride (NaBH 4 ) has been widely regarded as the one of most promising further hydrogen (H 2 )generated materials for the safe storage, transportation, and utilization of H 2 . Therefore, the exploration of more efficient catalytic systems for on-demand H 2 evolution via NaBH 4 hydrolysis is critical. Herein, a series of magnetic recyclable cobalt ferrite (CoFe 2 O 4 )-modified transition-metal nanoparticles (including Ru, Pd, Rh, Pt, Ir, and Ag) for the catalytic hydrolytic dehydrogenation of NaBH 4 for H 2 evolution have been developed for the first time. The order of the catalytic activity is Ru > Pd > Rh > Pt > Ir > Ag, indicating that Ru/ CoFe 2 O 4 and Pd/CoFe 2 O 4 are the most active, with turnover frequencies of 421 and 348 mol H 2 •mol cat −1 •min −1 . By comparing with other carriers, we found the key factor to be CoFe 2 O 4 in facilitating H 2 production upon the hydrolytic dehydrogenation of NaBH 4 in this work. KEYWORDS: sodium borohydride (NaBH 4 ), hydrogen evolution, CoFe 2 O 4 , nanoparticles, hydrolysis

Metal/N-Doped Carbon Nanoparticles Derived from Metal–Organic Frameworks for Electromagnetic Wave Absorption

“…28 Herein, the Co-based MOFs (ZIF-67) were first prepared by the traditional coprecipitation method, that is, by adding Co metallic Ni phase (PDF#04-0850). 30 However, the Fe/Co-NC NPs display a mixed phase of CoO (PDF#43-1004) and CoFe 2 O 4 (PDF#79-1744), 31,32 without the formation of metallic phases. At the same time, the Raman spectra of the samples are provided, as shown in Figure 1b.…”

Single-Atom Sn-Loaded Exfoliated Layered Titanate Revealing Enhanced Photocatalytic Activity in Hydrogen Generation

“…Replacing fossil fuels with green hydrogen (H 2 ) has been accelerated in the current decade as one of the indispensable decarbonizing alternatives to mitigate CO 2 emissions and harness climate change and its further consequences . After photocatalytic water splitting, dehydrogenation of small molecules by photocatalysis has become one of the key approaches for green sustainable H 2 production. , The borane compounds (as a high-content H 2 reservoir) − are unique candidates for H 2 generation through a proper (photo)­catalyst. Among the (photo)­catalysts, layered materials are front liners in the catalysis toward H 2 production , due to their large theoretical surface area and their game-changing chemistry (e.g., functional groups) and physics (e.g., electron–phonon interactions), originating from their anisotropic structures. , However, layered materials are usually in 3D bulk structures and need to be exfoliated since in the pristine bulk form, the layers are stacked through weak interactions, and the interlayers are inactive …”

“On–off” switch for H2 and O2 generation from HCOOH resp. H2O2

“…The exploration of efficient and safe production, storage, and transportation (especially in long term) of H 2 , an ultra‐low density and awfully low‐boiling point gas, 11–15 is a serious challenge 16–20 . Consequently, numerous inorganic and organic compounds have been proposed as hydrogen carriers, such as methanol, 21 ammonia, 22,23 methane, 24 ammonia borane, 3,25–29 hydrazine hydrate, 30 dimethylaminoborane, 31 sodium borohydride, 3,32–37 tetrahydroxydi‐boron, 38–41 tetramethyldisiloxane, 42 hydrazine borane, 43 and formic acid (FA) 44–46 . Among them, FA, the main product of biomass manufacture by hydrolysis or oxidation of cellulose with high yields, 47–50 has become one of the most attractive hydrogen carriers due to its excellent hydrogen content (4.4 wt%), high volumetric hydrogen storage density of 53 g/L, nontoxicity, ease of portability, regeneration from CO 2 hydrogenation, and liquid stability at room temperature.…”

“…[6][7][8][9][10] The exploration of efficient and safe production, storage, and transportation (especially in long term) of H 2 , an ultralow density and awfully low-boiling point gas, [11][12][13][14][15] is a serious challenge. [16][17][18][19][20] Consequently, numerous inorganic and organic compounds have been proposed as hydrogen carriers, such as methanol, 21 ammonia, 22,23 methane, 24 ammonia borane, 3,[25][26][27][28][29] hydrazine hydrate, 30 dimethylaminoborane, 31 sodium borohydride, 3,[32][33][34][35][36][37] tetrahydroxydiboron, [38][39][40][41] tetramethyldisiloxane, 42 hydrazine borane, 43 and formic acid (FA). [44][45][46] Among them, FA, the main product of biomass manufacture by hydrolysis or oxidation of cellulose with high yields, [47][48][49]…”