Scanning electrochemical microscopy determination of hydrogen flux at liquid|liquid interface with potentiometric probe

Abstract

Scanning electrochemical microscopy potentiometric determination of local hydrogen concentration and its flux next to the liquid|liquid interface was demonstrated. This method is based on the shift of open circuit potential of Pt-based reversible hydrogen electrode. The detection system was verified with a system generating hydrogen under galvanostatic conditions. Then, it was applied to aqueous|1,2-dichloroethane interface where hydrogen is produced with decamethylferrocene as electron donor.

SECM study of hydrogen photogeneration in a 1,2-dichloroethane | water biphasic system with decamethylruthenocene electron donor regeneration

“…This is due to the fact that only a fraction (< 10%) of H 2 generated in DCE phase is transferred to aqueous phase. It is in accordance with our earlier considerations based on higher solubility of H 2 in DCE than in water and slightly lower viscosity of DCE [22].…”

“…Estimation of local H 2 concentration in aqueous phase, [H 2 ], was performed by potentiometry with Pt microelectrode (100 μm diameter). Its value was calculated from E OCP of this cell versus the RHE using the following equation [13,22]:…”

Gold Nanofilm Redox Catalysis for Oxygen Reduction at Soft Interfaces

“…A burgeoning area of research is concerned with the biphasic electrocatalysis of redox reactions of interest for energy research, including the oxygen (O 2 ) reduction reaction (ORR) [9][10][11][12][13][14][15][16][17][18][19] and the hydrogen (H 2 ) evolution reaction (HER) [20][21][22][23][24][25][26][27][28], using soft interfaces functionalized with molecular species, metallic NPs or inorganic non-precious metal-based materials. The use of adsorbed solid particulate electrocatalysts at electrochemically polarisable soft interfaces has recently been reviewed by Dryfe and co-workers [29].…”

H2O2 Generation at a Carbon‐Paste Electrode with Decamethylferrocene in 2‐Nitrophenyloctyl Ether as a Binder: Catalytic Effect of MoS2 Particles

“…In other experiments, MoS 2 powder (0.5 % w/v) was added to the organic phase. The samples were stirred with a magnetic bar for 8 h. For starch and iodide‐based H 2 O 2 detection, the aqueous phase was sampled and KI (200 μL, 0.1 mol dm −3 ) and starch solution (10 %) was added …”

“…Unsuccessfula ttempts to detect hydrogen generation at the NPOE/water interface by using methodology proposed previously [45] indicates al ack of catalytic hydrogen evolution in the studied system.…”