Preferentially (100) oriented Pt thin film with less than a monolayer of Bi, Pd and Sb adatoms: application for formic acid oxidation

The Art of Decoration: Rhodium-Modified Platinum Films with Preferential (100) Orientation as Electrocatalysts for Nitrate Reduction and Dimethyl Ether Oxidation

“…These are representative of different stages in the Rh decoration of the Pt surface. In the first place, the blank voltammogram of the as-prepared Pt electrode is in very good agreement with previously published results; − it displays four main features, labeled h 1 , h 2 , h 3 , and h 4 from lower to higher potentials. , These signals arise from the various surface domains that constitute the electrodeposited Pt film . The largest voltammetric peak is h 2 ( E h 2 = 0.26 V) which is associated with hydrogen and (bi)­sulfate adsorption/desorption at (100) steps and narrow terraces.…”

“…The overall response to surface-sensitive probes indicates that the share of the surface ordered as (100) is large enough for us to describe the electrode as preferentially (100) oriented: this orientation can extend over as much as 45% of the surface, as thoroughly discussed in previous publications. [32][33][34]37 However, the (100) domains are undoubtedly small. Their size could be estimated by referring for instance to the voltammetric features reported for Pt[n(100) × (110)] singlecrystals.…”

“…Pt electrodes were prepared by electroplating onto strips of 0.5 mm thick Ti foil (99%, Alfa Aesar) from a plating bath containing 0.5 mM Na 2 PtCl 6 (31.30–36.00% w/w Pt, Alfa Aesar) in 0.01 M HCl (TraceMetal grade, Fisher Scientific), as described previously. − ,,, The main steps of the electroplating procedure are as follows: first, care was taken to remove oxides from the Ti surface immediately prior to the deposition of Pt: Ti foils were coarsely polished with sandpaper and subsequently boiled in 10% oxalic acid (anhydrous, 98%, Acros Organics) for an hour. The geometric surface area was kept constant at 1 cm 2 for all electrodes by covering the Ti foil with Teflon tape.…”

“…As discussed in this introduction, all papers addressing Rh deposition on ordered Pt surfaces have either dealt with single-crystal electrodes − ,, or preferentially oriented nanoparticles . In this work, we instead focus on a different type of Pt surface: electrodeposited films having a preferential (100) orientation. − These electrodes are significantly more inexpensive than single-crystal model surfaces, while retaining a high proportion of (100) sites which are extremely active toward several electrochemical reactions. However, the very structure of the electrodeposited Pt films represents a significant challenge in terms of the controlled deposition of Rh adlayers and site-selective decoration.…”

Formic acid oxidation on platinum: a simple mechanistic study

“…The direct formic acid oxidation reaction at Pt surfaces under electrocatalytic conditions has been widely studied by theoretical [9][10][11][12] and experimental [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] means, but some fundamental questions about the reactive species and the reaction mechanism remain unresolved. Complete oxidation yields CO 2 and protons: HCOOH -CO 2 + 2H + + 2e À .…”