Electrochemical deposition of Pt nanoparticles on diamond substrates

Abstract

Platinum nanoparticles were deposited on polished smooth, as-grown large grain and small grain diamond substrates by a potentiostatic method. The influence of deposition potential and the morphology of BDD substrates were studied. A progressive nucleation along with spherical clusters was observed on smooth BDD electrode, accompanied with a heterogeneous segregation of platinum on diamond facets of higher electro-chemical activities and a weak binding to the substrate. In contrast, an instantaneous nucleation was observed on as-grown small grain and large grain BDD electrodes, with a dendritic microstructure and a much larger specific active area. The platinum decorated as-grown smaller grain BDD electrodes show a much better electrochemical stability than the other electrodes investigated.

Electrochemical deposition of Pt–Ru on diamond electrodes for the electrooxidation of methanol

“…1a and b. Sequential deposition of Pt-Ru produces a dendritic microstructure and uniform cluster size (Fig. 1a), which is consistent with the typical microstructure of Pt particles from potentiostatic deposition on similar rough BDD substrates as a result of instantaneous nucleation [21]. The morphology of the Pt-Ru particle is dictated by Pt deposition in the first step, and the following Ru deposition has little impact on the microstructure.…”

“…For example, Pt was co-deposited with BDD during CVD growth [17], implanted into BDD [18], thermally decomposed on BDD [19] and electrochemically deposited on BDD [20,21]. For this latter approach, it is notable that the morphology of the deposited Pt is influenced by the electrochemical method used in the deposition, as smooth Pt particles are observed after linear potential sweep deposition [22] in contrast to dendritic structures after potentiostatic deposition [21].…”

Nanostructured Carbon Materials for Energy Conversion and Storage

“…In addition, it is still difficult to realize a homogeneous and controllable boron doping level in diamond powders. 106,107 Various different routes such as co-deposition of Pt during CVD growth, 108 implantation, 109,110 thermal decomposition, 98 electroless deposition, 111 and electrochemical deposition [112][113][114][115][116][117] have been explored to optimize the Pt deposition process on BDD. Cabrera et al investigated the performance of detonated diamond nanoparticles and boron-doped diamond powders, obtained by ion implantation, as supports for Pt and Pt-Ru catalysts in direct methanol fuel cells.…”

Electrodeposition of a Pt–PrO2−x electrocatalyst on diamond electrodes for the oxidation of methanol

“…For this reason, studies have begun to consider the use of boron‐doped diamond 20 as a stable and inert carbon support material, especially as the material is also now becoming available in a high surface area nanoparticle form 21. In particular, the electrocatalytic properties of Pt nanoparticles on diamond with regard to the oxidation of methanol has been investigated 22, 23.…”