“On–Off” Control for On-Demand Hydrogen Production from the Dehydrogenation of Formic Acid

Abstract

In order to effectively use the produced H 2 , the exploration of "on−off" control for on-demand hydrogen production is still a practical matter of supreme importance. Herein, a surfactant-free and facile method was successfully employed to synthesize Ag−Pd/C nanocomposites via simple alloying of commercial Pd/C and Ag for synergistically promoting H 2 production from formic acid (FA). The optimal Ag 16 −Pd 1 /C nanocomposite presents the highest catalytic activity with a turnover frequency of 2444.10 h −1 and 100% H 2 selectivity, whereas that of commercial Pd/C is only 619.39 h −1 . Indeed, the activation energy has been effectively reduced from 40.45 kJ/mol (Pd/C) to 32.27 kJ/mol (Ag 16 −Pd 1 /C) by alloying commercial Pd/C with Ag. More importantly, the highly selective and effective "on−off" switch for hydrogen production upon the dehydrogenation of FA has been successfully achieved by varying the pH.

Efficient and controlled H2 release from sodium formate

“…A simple and surfactant-free methodology is therefore employed for the synthesis of M 16 Pd 1 /C bimetallic nanomaterials by alloying commercial Pd/ C with a transition metal. 45 We show that this catalyst is highly active for direct H 2 production by decomposition of SF in the presence of acetic acid (eqn (1)). Commercial Pd/C has been extensively used as a highly efficient and reusable heterogeneous catalyst in carbonylation, C-H activation, hydrogen-ation, C-C coupling and cyclization reactions.…”

“…42 The synthesis and catalytic use of PdAg bimetallic nanocomposites have been reported, in particular for electrochemical catalysis, 43 oxygen reduction 44 and H 2 generation by FA dehydrogenation. 45 We now report direct H 2 production by catalytic decomposition of SF. A simple and surfactant-free methodology is therefore employed for the synthesis of M 16 Pd 1 /C bimetallic nanomaterials by alloying commercial Pd/ C with a transition metal.…”

Facile and green synthesis of carbon nanodots from environmental pollutants for cell imaging and Fe3+ detection

“…49 Our collaborative research team has long-term interest in the synthesis of carbon nanodots and their applications in biosensors, H 2 evolution and cell imaging. [50][51][52][53] In this study, we have successfully converted acid orange 7, a toxic and nonbiodegradable azo dye, into carbon nanodots with excellent blue-green fluorescence by means of a simple hydrothermal method. First, the reaction temperature and time for the synthesis of the CNDs have been investigated.…”

Mechanistic insights into H2 evolution via water splitting at the expense of B2(OH)4: a theoretical study

“…[10][11][12] Recently, hydrogen (H 2 ), as a green and highly efficient energy carrier, has been comprehensively deemed a promising potential candidate to replace fossil fuels due to its fascinating properties of super-high energy density (141.86 kJ g À1 ) and zero pollution. [13][14][15][16] For this reason, a large number of methods have been successfully developed for H 2 production, including methane steam-reforming, 17 methanol/ethanol steam-reforming, [18][19][20][21][22][23] coal gasification, 24 electric/photocatalytic water splitting, [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] and hydrolysis of chemical hydrogen storage materials. 41,42 Among them, H 2 evolution upon the hydrolysis of chemical hydrogen storage materials has attracted wide attention because it could solve the problems concerning safe production, storage and transportation of H 2 .…”