High Performance Direct N₂H₄-H₂O₂ Fuel Cell Using Fiber-Shaped Co Decorated with Pt Crystallites as Anode Electrocatalysts

Abstract

In this study, a fiber-shaped Co coating was electroplated on the Cu surface followed by the deposition of Pt crystallites using the galvanic displacement method. The electrochemical behavior of the prepared Co fiber and Pt nanoparticles decorated Co fiber catalysts were evaluated in order to provide insights into the electro-oxidation of N 2 H 4 in an alkaline media was performed using cyclic voltammetry and chrono-techniques. The influence of Co fiber /Cu and PtCo fiber /Cu as the anode electrocatalyst on the performance of direct N 2 H 4 -H 2 O 2 fuel cell was investigated at different temperatures. The deposition of a small amount of Pt crystallites, in the range of 5 μg Pt cm -2 to 29 μg Pt cm -2 , significantly improved the performance of the fiber-shaped Co catalyst for the electro-oxidation of N 2 H 4 in an alkaline medium. The measured N 2 H 4 oxidation current densities at −0.2 V are approximately 5-6 times larger for different PtCo fiber /Cu catalysts, compared with that of a pure Co fiber /Cu. The single N 2 H 4 -H 2 O 2 fuel cell results showed that the highest peak power density of 219.8 mW cm -2 for the N 2 H 4 -H 2 O 2 fuel cell was obtained with the PtCo fiber /Cu catalyst that has the Pt loading of 28.7 μg Pt cm -2 .

Palladium-Nickel Electrocatalysts on Nitrogen-Doped Reduced Graphene Oxide Nanosheets for Direct Hydrazine/Hydrogen Peroxide Fuel Cells

“…According to Equation ( 3), H 2 O and N 2 are products of this type of DFC [10,11]. Various chemicals have been designed recently and their performances as catalysts examined in the DHzHPFC [3,5,9,[12][13][14][15][16][17][18]. For example, the accumulation of gas bubbles on the electrode surface is effectively solved by using a nano-hill morphology of vertical graphene, by means of which a superoleophobic electrode was obtained that could accelerate the elimination process of bubbles generated on the anodic electrode surface.…”

Superaerophobic CoP Nanowire Arrays as a Highly Effective Anode Electrocatalyst for Direct Hydrazine Fuel Cells

“…The variation tendency was in agreement with other reports, , because the higher the temperature, the more intense the electrode reaction and the better the cell performance. However with the temperature increase, the side reactions of the HzOR (the chemical oxidation: N 2 H 4 = N 2 + 2H 2 , 3N 2 H 4 = 2N 2 + 4NH 3 ) were also accelerated and consequently the open-circuit voltage of DHzFCs decreased slightly . When the KOH concentration increased from 0.5 to 6.0 M in 0.5 M N 2 H 4 at 70 °C, both the open-circuit voltage and the maximum power density exhibited a peak value at 4.0 M KOH, as shown in Figure S17c,d.…”

“…However with the temperature increase, the side reactions of the HzOR (the chemical oxidation: N 2 H 4 = N 2 + 2H 2 , 3N 2 H 4 = 2N 2 + 4NH 3 ) were also accelerated and consequently the open-circuit voltage of DHzFCs decreased slightly. 46 When the KOH concentration increased from 0.5 to 6.0 M in 0.5 M N 2 H 4 at 70 °C, both the open-circuit voltage and the maximum power density exhibited a peak value at 4.0 M KOH, as shown in Figure S17c,d. It could be explained by the fact that the high KOH concentration could increase the ionic conductivity of the electrolyte until a turning point where the electrolyte becomes viscous and the ionic conductivity declines.…”

Remarkable bismuth-gold alloy decorated on MWCNT for glucose electrooxidation: the effect of bismuth promotion and optimization via response surface methodology

“…Energy is a vital and permanent need for human life and welfare [1][2][3][4][5][6][7]. Fuels such as formic acid [8][9][10], glucose (GA) [11], ethanol [12,13], ethylene glycol [14], hydrazine [15], and methanol [16,17] are principal sources. From these sources, GA is given great significance due to its advantages such as abundance in nature, cheapness, non-toxicity, and easy to transport [18][19][20].…”