Recent Progress on Catalysts for Hydrogen Evolution from Decomposition of Hydrous Hydrazine

Platinum(IV) Carbonato Complexes: Formation via the Addition of CO2 to the [Pt(OH)6]2– Anion and Generation of Platinum(IV) Oxide Nanoparticles for the Preparation of Catalysts

“…It is interesting that platinum, nickel, and cobalt do not show notable activity themselves. The activity of supported bimetallic catalysts can be significantly modulated by utilizing appropriate supporting materials, and here, we tested three different supports (SiO 2 , CeO 2 , and g-C 3 N 4 ) to show the compatibility of the Pt bicarbonate precursor with various materials.…”

“…70 It is interesting that platinum, nickel, and cobalt do not show notable activity themselves. The activity of supported bimetallic catalysts can be significantly modulated by utilizing appropriate supporting materials, 71 and here, we tested three different supports (SiO 2 , CeO 2 , and g-C 3 N 4 ) to show the compatibility of the Pt bicarbonate precursor with various materials. Taking into account the peculiarities of the bicarbonate solution of HHPA, an original method was developed to utilize such a precursor for the preparation of heterogeneous PtNi/ support catalysts.…”

CuNi/La2O2CO3/rGO Nanocomposites: An Efficient Noble-Metal-Free Catalyst for Hydrogen Evolution from N2H4·H2O

“…The catalyst showed the highest efficiency at the optimum NaOH concentration of 2.0 M, and further increased concentration had no positive effect. The possible reason for the improvement effects may be attributed to the following: (1) the ability of NaOH to facilitate the N–H bond cleavage of N 2 H 4 in the rate-determining step (N 2 H 4 → N 2 H 3 * + H*) and to suppress the formation of the undesired N 2 H 5 + (N 2 H 5 + + OH – → N 2 H 4 + H 2 O) and (2) the ability of the strong alkaline environment to efficiently prevent the production of the basic NH 3 byproduct. ,,, …”

“…Compared with other catalysts, CuNi/La 2 O 2 CO 3 /rGO NCs had the highest catalytic efficiency (TOF = 114.3 h −1 ), i.e., 2) the ability of the strong alkaline environment to efficiently prevent the production of the basic NH 3 byproduct. 14,19,43,70 Furthermore, the effect of hydrogen evolution temperature on the catalytic activity of CuNi/La Catalyst stability is crucial in practical application. Thus, we further evaluated the cycle stability of CuNi/La 2 O 2 CO 3 /rGO NCs by injecting the same amount of N 2 H 4 •H 2 O (100 μL) into the reaction vessel after the previous run.…”

“…Hydrogen (H 2 ) is well-known as one of the most potential alternative energy carriers for traditional fossil fuels due to its remarkable energy density, environment friendliness, and renewability. − However, the main challenge in promoting fuel-cell-based hydrogen economy is its safe and efficient storage, release, and transportation. Among hydrogen-storage materials, hydrous hydrazine (N 2 H 4 ·H 2 O, 8.0 wt %) is attracting condierable attention as one of the most promising chemical hydrogen-storage materials because of their excellent stability, high hydrogen capacity, CO-free hydrogen production, and easy replenishment as a liquid. − Under suitable reaction conditions and catalysis, hydrogen stored in N 2 H 4 ·H 2 O can be readily decomposed into H 2 and N 2 (eq ). − N 2 H 4 decomposition also includes a side reaction that yields H 2 and NH 3 (eq ).…”