Pd–Co/MWCNTs Catalyst for Electrooxidation of Hydrazine in Alkaline Solution

Abstract

Multiwall carbon nanotubes supported Pd–Co electrocatalysts (Pd–Co/MWCNTs) for hydrazine electrooxidation in alkaline electrolytes were prepared. Their morphology and structure were characterized by scanning electron microscopy, transmission electron microscope, and X‐ray diffraction. The effect of the mass ratio of Pd to Co on the catalytic performance was examined via cyclic voltammetric and chronoamperometric measurements. The Pd–Co/MWCNTs with a mass ratio of 1:1 for Pd:Co shows higher catalytic performance than both Pd/MWCNTs and Co/MWCNTs and it has good stability for catalyzing the electrooxidation of hydrazine. The gas collection measurements indicated that hydrazine electrooxidation on Pd–Co/MWCNTs proceeded via a near 4‐electron pathway.

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

“…Chakraborty et al [91] synthesized nanosized Pd particles supported on MWCNTs. Bai et al [67,92] functionalized MWCNTs with 1,10-phenanthroline (phen-MWCNTs) as a catalyst support for Pd nanoparticles. It was found that Pd nanoparticles were evenly deposited without obvious agglomeration, and the average particle size of the Pd nanoparticles was only as small as 2.3 nm.…”

Cobalt-modified palladium nanocatalyst on nitrogen-doped reduced graphene oxide for direct hydrazine fuel cell

“…In addition, Pd-alloying with Co not only decreases the use of Pd but also improves the performance of the resultant catalysts. 29,30 The performance of PdCo nanoparticles (PdCo NPs) is further improved by incorporation on a suitable support material. A suitable support material promote the charge transfer kinetics in the catalyst due to its high electrical conductivity.…”

Room-temperature synthesis with inert bubble templates to produce “clean” PdCoP alloy nanoparticle networks for enhanced hydrazine electro-oxidation

“…On the reverse sweep, the dened peak near 0.2 V was characteristic of the reduction of Co(II) to Co(0) and Co(III) to Co(II). 8 The broad and weak peaks at $À0.78 V in the forward scan and at $À0.45 V in reverse scan were characteristic of Pd oxidation/reduction. The results suggest that both Pd and Co were present in all three catalysts.…”

“…Bimetallic and multimetallic alloy catalysts (compared to catalysts comprising a single noble metal element) have been shown to produce higher catalytic activity due to synergistic effect between their different components. [7][8][9][10] Various factors such as morphology, composition, and nano-structural architecture can be modied to improve the catalytic performance of metal-based alloys. 11 In particular, threedimensional porous or network-like structures are of great interest due to their high surface area-to-volume ratio, low density, high gas permeability (compared to their solid counterparts), and high density of atomic scale defects.…”