TY - JOUR
T1 - Study of the hydrogen evolution reaction using ionic liquid/cobalt porphyrin systems as electro and photoelectrocatalysts
AU - Gidi, Leyla
AU - Honores, Jessica
AU - Ibarra, José
AU - Arce, Roxana
AU - Aguirre, M. J.
AU - Ramírez, Galo
N1 - Funding Information:
Acknowledgments: This work was supported by FONDECYT Project number 1170340; FONDECYT Project No. 1160324; Dicyt-Usach and Doctoral Scholarship CONICYT Project No. 21170542; FONDECYT postdoctorado No: 3180061.
PY - 2020/2
Y1 - 2020/2
N2 - In this work, the design and manufacture of graphite paste (Gr) electrodes is carried out, including N-octylpyridinium hexafluorophosphate (OPyPF6) ionic liquid (IL) as binder and modification with Co-octaethylporphyrin (Co), in order to study the hydrogen evolution reaction (HER) in the absence and presence of light. The system is characterized by XRD and FESEM-EDX (Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy), confirming the presence of all the components of the system in the electrode surface. The studies carried out in this investigation confirm that a photoelectrocatalytic system towards HER is obtained. The system is stable, efficient and easy to prepare. Through cyclic voltammetry and electrochemical impedance spectroscopy, was determined that these electrodes improve their electrochemical and electrical properties upon the addition of OPyPF6. These effects improve even more when the systems are modified with Co porphyrin. It is also observed that when the systems are irradiated at 395 nm, the redox process is favored in energy terms, as well as in its electrical properties. Through gas chromatography, it was determined that the graphite paste electrode in the presence of ionic liquid and porphyrin (Gr/IL/Co) presents a high turnover number (TON) value (6342 and 6827 in presence of light) in comparison to similar systems reported.
AB - In this work, the design and manufacture of graphite paste (Gr) electrodes is carried out, including N-octylpyridinium hexafluorophosphate (OPyPF6) ionic liquid (IL) as binder and modification with Co-octaethylporphyrin (Co), in order to study the hydrogen evolution reaction (HER) in the absence and presence of light. The system is characterized by XRD and FESEM-EDX (Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy), confirming the presence of all the components of the system in the electrode surface. The studies carried out in this investigation confirm that a photoelectrocatalytic system towards HER is obtained. The system is stable, efficient and easy to prepare. Through cyclic voltammetry and electrochemical impedance spectroscopy, was determined that these electrodes improve their electrochemical and electrical properties upon the addition of OPyPF6. These effects improve even more when the systems are modified with Co porphyrin. It is also observed that when the systems are irradiated at 395 nm, the redox process is favored in energy terms, as well as in its electrical properties. Through gas chromatography, it was determined that the graphite paste electrode in the presence of ionic liquid and porphyrin (Gr/IL/Co) presents a high turnover number (TON) value (6342 and 6827 in presence of light) in comparison to similar systems reported.
KW - Hydrogen evolution reaction
KW - Ionic liquids
KW - Metalloporphyrins
KW - Photoelectrocatalysis
UR - http://www.scopus.com/inward/record.url?scp=85079660162&partnerID=8YFLogxK
U2 - 10.3390/catal10020239
DO - 10.3390/catal10020239
M3 - Article
AN - SCOPUS:85079660162
VL - 10
JO - Catalysts
JF - Catalysts
SN - 2073-4344
IS - 2
M1 - 239
ER -