Porphyrin-functionalized glassy carbon electrodes for electrochemical water splitting
Herein, we electrografted the free-base 5,10,15,20-tetrakis(4-aminophenyl)porphyrin, (H<sub>2</sub>TAPP) and the cobalt-based porphyrin (CoTAPP) onto the surface of glassy carbon electrodes (GCE) which results in a H<sub>2</sub>TPP-GCE and CoTPP-GCE polymer, respectively. Electropolymerization forms a stable, covalently bonded network, enhancing the electrochemically active surface area (to 47.7 cm<sup>2</sup>, 29.2 cm<sup>2</sup>, respectively) and lowering the charge transfer resistance during OER and HER based on EIS data. H<sub>2</sub>TPP-GCE exhibits a Tafel slope of 113 mV dec<sup>-1</sup> for HER, while CoTPP-GCE achieves 80 mV dec<sup>-1</sup> for OER. The overpotentials are 511 mV (HER) and 540 mV (OER), with both electrodes remaining stable over 20 hours.
Authors
- Nasim Jafari (ORCID: https://orcid.org/0000-0002-1157-2632)
- Jonathan J. Calvillo Solís (ORCID: https://orcid.org/0000-0003-2928-488X)
- D. Villagrán (ORCID: https://orcid.org/0000-0002-5798-3584)
- Neidy Ocuane (ORCID: https://orcid.org/0000-0002-6674-8201)
- Manuel Saucedo
Institutions
- The University of Texas at El Paso (US)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5dt01390a
- Citations
- 6
- Primary Topic
- Electrochemical sensors and biosensors
- Type
- article
- Field-Weighted Citation Impact
- 4.38
Funders
- National Science Foundation
- Welch Foundation
- Basic Energy Sciences