Electrodeposition of Pdnanoparticles on C@TiO2 nanoarrays: 3D electrode for the direct oxidation of NaBH4

Abstract

A newly designed and fabricated electrode with three-dimensional structures is reported. The electrode consists of a conducting nanoarray substrate and Pd nanoparticles. The substrate is an array of TiO 2 nanowires with a carbon coating layer prepared via a thermal evaporation method. Pd nanoparticles were electro-deposited on the substrate surfaces by the potentiostatic pulse method. The morphology of the electrode is observed by scanning electron microscopy and transmission electron microscopy, and its structure is analyzed using an X-ray diffractometer. The catalytic performance is evaluated by cyclic voltammetry and chronoamperometry. The electrode exhibited excellent catalytic performance for NaBH 4 electro-oxidation. The current density for NaBH 4 electro-oxidation at the electrode reported in this work (524 mA mg À1 ) is about 5 times of that at conventional Pd/C (100 mA mg À1 ). This enhanced performance is likely to be due to the improved mass transport of NaBH 4 , good electronic conductivity and high Pd utilization of the electrode.

Deposition of Poly(diphenylamine-co-3-aminobenzonitrile)/Palladium Nanocomposite Film and Evaluation of Electrocatalytic Activity Toward Borohydride Oxidation

“…Literature inform that peak positions and their separation for hydrogen adsorption and absorption/desorption regions depend on the type of support matrix. 8 30 31 The peak current values that correspond to H ad and H ab processes are significantly higher at P(DPAco-3ABN)(3:1)/Pd-ME (Fig. 2, curve a) in comparison to PDPA/Pd-ME (Fig.…”

“…The NaBH 4 oxidation was accompanied by the formation of small bubbles on the electrode surface and can be related to the oxidation reaction of BH − 4 , involving the BH 3 OH − intermediate. 8 In an another report, Yi et al 9 prepared carbon supported Pd hollow nanospheres and used as the anode electrocatalyst for BH − 4 oxidation. However, reports on the use of noncarbon support based Pd electrocatalyst for BH − 4 oxidation has not been reported so far.…”

Arginine-assisted synthesis of palladium nanochain networks and their enhanced electrocatalytic activity for borohydride oxidation

“…During the BOR, a large amount of hydrogen (H 2 ) may be produced from the NaBH 4 hydrolysis (BH 4 − +2H 2 O=4H 2 +BO 2 − ), and accumulate on Pd surface to form gas bubbles, which will block the active sites of Pd electrocatalyst. 21 Compared with the commercial Pd black, the as-prepared Pd-NCNs are better for the removal of adsorbed H 2 bubbles and liberate more active site due to the unique 3D network structure. Meanwhile, the unique 3D network structure also provides much more active center for electrocatalytic oxidation due to high specific surface area and abundant surface defect sites, which is also responsible for the improved electrocatalytic activity of Pd-NCNs for the BOR.…”

“…[17][18][19][20][21][22][23] Thus, the development of highly active PMNs electrocatalysts for the borohydride oxidation reaction (BOR) will facilitate the commercialization of DBFCs. Pd, as one of the precious metal, has already been widely applied to borohydride electrocatalytic oxidation due to their excellent electrocatalytic activity and stability in alkaline medium.…”

Ni-Mg Bimetallic Catalysts for Preparation of Multi-Walled Carbon Nanotubes from Polypropylene: Influence of the Ratio of Ni/Mg

“…1 In general, methane, 2-4 ethylene, [5][6][7] acetylene [8][9][10] and other hydrocarbons have been used as carbon sources for CNT synthesis. Apart from these hydrocarbons, the use of waste polymers as feedstock is more environmental and economical for CNT synthesis.…”