Dissolution of BiVO4 Photoanodes Revealed by Time-Resolved Measurements Under Photoelectrochemical Conditions
| Autor: | Serhiy Cherevko, Christina Scheu, Martin Rohloff, Karl Johann Jakob Mayrhofer, Siyuan Zhang, Olga Kasian, Anna Fischer, Andrea Maria Mingers |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Electrode material
Materials science Photon business.industry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Optoelectronics ddc:530 Limit (mathematics) Physical and Theoretical Chemistry 0210 nano-technology business Dissolution |
| Zdroj: | The Journal of Physical Chemistry The journal of physical chemistry |
| Popis: | Photocorrosion imposes a fundamental limit to the longevity of devices that harvest energy from photons. As one of the best performing electrode materials for photoelectrochemical water oxidation reaction, BiVO4 undergoes photocorrosion with various postulated mechanisms under debate. We present time-resolved dissolution measurements to advance the mechanistic understanding, enabled by the recent development in illuminated scanning flow cell coupled to inductively coupled plasma mass spectrometry. The contact dissolution of predominantly V was distinguished from the stoichiometric photoelectrochemical dissolution of Bi and V. The citrate electrolyte was utilized to form soluble complexes with dissolved Bi and to act as hole scavengers that provide photocurrents at a wide range of potentials. The photoelectrochemical dissolution rates remain similar between 0.4 and 1.6 V vs reversible hydrogen electrode and become lower at the open circuit potential, 0.2 V. The time-resolved measurements support oxidation of Bi(III) by photogenerated holes as the main mechanism for photocorrosion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|