Oscillatory ethylene glycol electrooxidation reaction on Pt in alkaline media: The effect of surface orientation

Using the site-knockout strategy to understand the low activity of the nitrate electro-reduction reaction on Pt(111)

“…32, and the surface activation procedure in ref. 33. The working electrode area was estimated as 0.0450 cm 2 .…”

Stimulation of ethylene glycol electrooxidation on electrodeposited Ni–PbO2–GN nanocomposite in alkaline medium

“…The estimated equivalent circuit is represented as a simple Randle equivalent circuit, where R ct is the charge transfer resistance, R s represents the solution resistance and CPE is the constant phase element, respectively. Because (19) I cat ∕I L = 0.5 0.5 = 0.5 (kC * t) 0.5 CPE corresponds to the double-layer capacitance, it was necessary to substitute the double-layer capacitance in the equivalent fitting circuits with a constant phase element to get successfully fitting impedance diagrams. This replacement is due to the microscopic roughness of the electrode surface, which makes an inhomogeneous distribution in the double-layer capacitance and the solution resistance [108].…”

“…Additionally, the energy efficiency of ethylene glycol oxidation reaction (EGOR) in the acidic media is low, because Pt is easily poisoned by CO ads that is formed during the oxidation of the alcohol at the anode of a fuel cell [6,[9][10][11]. On the contrary, the oxidation reaction of EG is more feasible in alkaline media from a kinetic point of view because of the higher activity of EGOR and the easier electron transfer in the presence of hydroxide ions [12][13][14][15][16][17][18][19]. A variety of catalyst materials can be used in alkaline media that have high catalytic activity and relatively low cost.…”

“…Another pathway leads to the formation of glycolates and formate which can be further oxidized to poisonous products as follows [20][21][22]: But, generalizing the use of EG fuel cells on a commercial scale requires highly efficient and cheap anode catalysts for EGOR. For many years, EGOR has been extensively investigated on various metal and modified metal electrodes such as Pt, Pd Au, Co, Ag, Fe, and Ni in alkaline media [19,[23][24][25][26][27][28][29][30][31]. The use of Pt and Pt-based catalyst anodes are of great importance due to their high efficiency towards the EGOR and the reaction takes place at lower potential values, but its high cost and its poisoning by CO adsorbed species are challenges [6, 10-12, 24, 25].…”