On‐line Determination via Differential Electrochemical Mass Spectroscopy (DEMS) of Chemical Products Formed in Photoelectrocatalytical Systems

Abstract

The evolution of oxygen in acid aqueous solution on thin porous titanium dioxide (anatase) electrodes under illumination was monitored with DEMS. By adding Cl− in the electrolyte, a Cl2 mass signal is additionally observed. This latter increases as a function of Cl− concentration while O2 mass signal decreases, although the photocurrent‐potential characteristics remain unchanged. This example illustrates a competitive oxidation which cannot be discriminated by only recording photocurrent‐potential curves.

In Situ Structural Study of MnPi-Modified BiVO4 Photoanodes by Soft X-ray Absorption Spectroscopy

“…For comparison, MnPi was also deposited on FTO/glass or published works. 34,35 The inlet system between the electrochemical cell and the differential Figure S1a). After potentiostatic deposition at 1.46 V (all potentials in this paper are reported with respect to RHE) for 20 min, the BiVO4 photoanode is partially covered by a MnOx porous layer (see Figure 1b and c).…”

Ruthenium sulphide thin layers as catalysts for the electrooxidation of water

“…The details of the differential electron mass spectroscopy (DEMS) are already published by Bogdanoff et al 17,18 The inlet system between the electrochemical cell and the differential pumped vacuum system of the mass spectrometer (Balzers; QMI 420, QME 125, QMA 125 with 901 off axis SEM) consists of a porous hydrophobic membrane, covered with a 100 nm thick Au-layer. This layer serves as a working electrode contact for the RuS 2 films which were attached to the gold layer.…”

Surface aspects of sol–gel derived hematite films for the photoelectrochemical oxidation of water

“…Fig 16. Valence band (VB) region of (A) an untreated hematite film and (B) a plasma treated hematite film.…”