Electrochemical reduction of oxygen in alkaline solution on Pd/C catalysts prepared by electrodeposition on various carbon nanomaterials

Electroreduction of Oxygen on Carbide‐Derived Carbon Supported Pd Catalysts

“…Sadly, this is contrasted by reports of low stability and high degree of PdNP agglomeration when using CNTs as the support material for Pd catalyst . High degree of agglomeration of PdNP and difficulty of depositing on the surface of CNTs has also been confirmed in our previous work, where it was found that CNTs possess less number of sites for metal deposition . As a way to improve the dispersion of Pd particles on CNTs Wang et al.…”

“…Similarly, a better ORR activity and dispersion of PdNPs was achieved with 3D graphene nanosheets, where higher surface area of the support material led to better dispersion of Pd particles compared to the Vulcan carbon support. In case of electrodeposited Pd catalysts, a support with a higher specific surface area like graphene nanosheets boosted higher ECSA and smaller particle sizes compared to similar depositions carried out on carbon black . Tafel slope values were determined between 0.95‐0.9 V. Typical Tafel slopes for O 2 reduction on polycrystalline Pd electrode close to −60 mV were observed, however depending on the carbon support the slope value has increased up to −90 mV as can be seen in case of commercial Pd/C and some other carbon‐supported Pd catalysts …”

“…Higher SA for Pd/CDC4 can be attributed to the agglomeration of particles and larger average particle size, as it has been shown that larger Pd particles generally have higher SA than smaller particles . All Pd/CDC catalysts, however, yielded significantly higher SA values than the commercial Pd/C catalyst, which could be attributed to the particle size effect, as for the commercial catalyst the average size of spherical Pd particles is around 3.5 nm . By comparing the half‐wave potential ( E 1/2 ) for O 2 reduction on different catalysts the Pd/CDC2 material possessed the highest E 1/2 value and Pd/Vulcan with Pd/CDC4 the lowest.…”

The pronounced effect of cobalt oxide on the electrocatalytic activity of palladium nanoparticles anchored on CoOx/NC towards the ORR with increased MA and ECSA

“…rule out the use of Pt as cathode catalyst for ORR. [9][10][11] The design of new palladium (Pd) based catalysts, has proved to be a good choice for catalysing the reduction of oxygen due to its resemblance with the intrinsic properties of benchmark metal i.e. ; platinum 3,12 including electronic structure and lattice parameters.…”

Bio-Mediated Synthesis of Nanomaterials for Electrochemical Sensor Applications

“…Nanoparticles have excellent dissimilar kinds of stuff to that of analogous material in bulk and extended consideration due to their exclusive morphology as well as physiochemical stuff such as tiny size, shape (needles, prisms, disks, leaves, cubes, spheres, sheets, flowers, rods, wires, belts, and tubes), and proper distribution of size [7,8,9]. There are several chemical and physical approaches for the preparation of objects from nano-particles such as chemical auto-combustion [10], sol-gel [11], conventional ceramic process [12], RF-sputtering [13], chemical reduction [14], microemulsion [15], reverse micelles [16], electrochemical reduction [17], Langmuir-Blodgett [18], microwave [19], UV irradiation [20], pyrolysis [21], lithography [22], and laser ablation [23]. However, there is a thoughtful necessity to swap the present methods with an uncontaminated, no-toxicity, and naturally tolerable green chemistry approach [24].…”