期刊
ELECTROCHIMICA ACTA
卷 258, 期 -, 页码 850-857出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.135
关键词
Hydrogen evolution reaction; Metalloporphyrins; Modified electrodes; Supramolecular system; Photoelectrocatalysis
资金
- FONDECYT [1170340]
- Doctoral Scholarship CONICYT [21140095]
Chemically modified glassy carbon electrodes formed by p-stacking of commercial cobalt (II) and copper (II) porphyrins have been used as stable and efficient electrocatalytic system for the hydrogen evolution reaction at pH 7.0, as reported in a previous work. In this work, it has been found that when these systems are irradiated with light of different wavelengths, their electrocatalytic responses change in terms of overpotential and photocurrent. Thus, the electroactivity of these systems towards hydrogen evolution reaction can be enhanced by irradiation at certain wavelength with no requirement of a photosensitizer. Interestingly, the largest enhancement of this reaction is observed at wavelengths corresponding to specific arrangement of porphyrins on the electrode. Cyclic voltammetry, photo-electrochemical impedance spectroscopy and UV-visible spectroscopy studies were done in order to corroborate and discuss this effect. Finally, XRD experiments allowed us to confirm the existence of highly ordered arrangement in each supramolecular system and that this is a determinant factor in the photoelectrochemical responses. (C) 2017 Elsevier Ltd. All rights reserved.
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