Stability and Dissolution of Platinum Surfaces in Perchloric Acid

Abstract

Stability and dissolution of platinum single-crystal surfaces were investigated with atomic force microscopy and inductively coupled plasma mass spectrometry. Both low-index surfaces and nanofaceted surfaces were investigated. A clear difference was observed between the large low-index surfaces and the nanofaceted surfaces. In the low-index surfaces, the platinum oxide formation passivates the surfaces, resulting in a lower dissolution rates at higher potentials. The nanofaceted surface dissolves faster at a higher potential, indicating the edges and corners are the main sources of dissolution. The differences in the dissolution behaviors between the low-index surfaces, (111), (100), and (110), are also discussed.

The ethanol electrooxidation at Pt layers deposited on polycrystalline Au

“…This behaviour can be attributed to differences in the stability of each deposit. The variations observed can be associated either with Pt mass losses, as a consequence of a dissolution process taking place throughout the cycling procedure, 23 or to the migration of Pt atoms to the Au crystalline phase. 24 As stated by Nørskov et al, 25 the deposition of small amounts of Pt on a Au(111) surface induces the formation of a substitutional alloy in the most top layers of the gold crystal.…”

Plasmonic Enhancement of Raman Scattering on Non-SERS-Active Platinum Substrates

“…28 As for the Ptcrystal, additional annealing was carried out at 1600 C°for 6 h under argon/hydrogen flow by using an induction heater (HOTSHOT-2 kW, Ameritherm), and then the surface was protected by a hydrogen-saturated pure water droplet. 29 CPI was chosen as a Raman scatterer because the NC stretching vibration of CPI is sensitive to metal substrates. SAMs of this molecule were formed on Pt and Au single crystal surfaces from a THF solution containing 10 mM CPI, which was obtained from Oakwood products and used as received, under argon atmosphere.…”

Pt and Pt/Ni "Needle" Eletrocatalysts on Carbon Nanotubes with High Activity for the ORR

“…This observation has led to the innovative development of highly active and stable core-shell electrocatalysts [8,9]. The stability is attributed to increased support-catalyst interactions through an anchoring effect between the alloying element and the support which prevents particle agglomeration [4,5] and limits Ostwald ripening [10,11].…”