Platinum-coated nanostructured oxides for active catalytic electrodes

Effect of HNO3 functionalization on large scale graphene for enhanced tri-iodide reduction in dye-sensitized solar cells

“…In this context, R ct provides a direct quantification of the catalytic properties of the given counter electrode in the redox couple regeneration process. 69 The pristine graphene shows a very high charge transfer resistance [R ct ] value (45.2 U cm À2 ) compared to the doped graphene electrodes, indicating the poor catalytic activity of their inherent basal planes. Surprisingly, the HNO 3 doped graphene electrodes showed a noticeably lower R ct value of 7.52 U cm À2 , which is $6 times lower than the pristine sample.…”

On the durability of Pt coated Ti electrodes for the electro-oxidative dissolution of spent nuclear fuels

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Figure 1 (a) PTFE sample holder to accommodate the corrosion coupons exposed to both the vapour phase (85°C) and the boiling liquid phase (110°C) of SDS. (b) Schematic of the sample holder assembly placed inside the left vertical limb of mockup Zr-4 dissolver [10].

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“…Baraka et al [5] reported on the Pt electrodeposited titanium substrates that showed high current efficiency whereas Lu and Zangari [6] developed Pt electrodeposited on highly oriented pyrolytic graphite. The electrocatalytic activity of platinum nanoparticles was discussed in a number of works reported in the literature for various applications such as fuel cells, dye sensitised solar cells to name a few [7][8][9][10][11][12][13][14][15].…”

Room temperature photo-induced deposition of platinum mirrors and nano-layers from simple Pt(ii) precursor complexes in water–methanol solutions

“…[1][2][3] Much of this work has focused on the preparation of Pt nanoparticles with dened size and shape by controlled reduction using a variety of methods ranging from hydrothermal, chemical and electrochemical reduction, sol-gel methodology, and so-called electroless techniques. [1][2][3][4][5][6][7][8][9][10][11] Generally the preparation of platinum nanoparticles employs commercially available Pt(IV) salts such as H 2 [PtCl 6 ]$xH 2 O and K 2 [PtCl 6 ], or less frequently the Pt(II) salt K 2 [PtCl 4 ] as precursor compounds. 1 Over the years, a plethora of electroless methods for Pt nanoparticle synthesis for use as catalysts has emerged, based on the chemical reduction from aqueous solution of mainly [PtCl 6 ] 2À anions and to a lesser extent [PtCl 4 ] 2À as precursors.…”

“…3 The improved catalytic performance of nanostructured platinum lms deposited by CVD methodology (using RF and DC sputtering methods under high vacuum at 200 C) onto for example CaCu 3 Ti 4 O 12 oxides as more active electrodes, suggests however potential advantages of electroless platinum deposition as nano-layers. 6 High temperature Pt-layer deposition by CVD methodology ($200 C) may, however be a technical disadvantage in the deposition of platinum nanolayers onto temperature sensitive substrates and devices. This is reected by a recent comparative review of various methods for the preparation of electro-catalysts with low Pt-loading onto more delicate substrates such as carbon nano-tube materials for potential use in PEMFCs, suggesting a need for further work in the realm of electro-less Pt deposition, particularly at low temperatures.…”