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. 2025 Aug 19;54(33):12550-12556.
doi: 10.1039/d5dt01390a.

Porphyrin-functionalized glassy carbon electrodes for electrochemical water splitting

Neidy Ocuane  1 , Nasim Jafari  1 , Jonathan J Calvillo Solis  1 , Manuel Saucedo  1 , Dino Villagrán  1
Affiliations

Porphyrin-functionalized glassy carbon electrodes for electrochemical water splitting

Neidy Ocuane et al. Dalton Trans. .

Abstract

Herein, we electrografted the free-base 5,10,15,20-tetrakis(4-aminophenyl)porphyrin, (H2TAPP) and the cobalt-based porphyrin (CoTAPP) onto the surface of glassy carbon electrodes (GCE) which results in a H2TPP-GCE and CoTPP-GCE polymer, respectively. Electropolymerization forms a stable, covalently bonded network, enhancing the electrochemically active surface area (to 47.7 cm2, 29.2 cm2, respectively) and lowering the charge transfer resistance during OER and HER based on EIS data. H2TPP-GCE exhibits a Tafel slope of 113 mV dec-1 for HER, while CoTPP-GCE achieves 80 mV dec-1 for OER. The overpotentials are 511 mV (HER) and 540 mV (OER), with both electrodes remaining stable over 20 hours.

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