Efficient electrocatalytic hydrogen gas evolution by a cobalt–porphyrin-based crystalline polymer. Issue 26 (20th June 2018)

• Record Type: Journal Article
• Authors: Wu, Yanyu; Veleta, José M.; Tang, Diya; Price, Alex D.; Botez, Cristian E.; Villagrán, Dino
• Is Part Of: Dalton transactions. Volume 47:Issue 26(2018)
• Page Start: 8801
• Page End: 8806
• Publication Date: 2018-06-20
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt00302e
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Herein, we report a crystalline CoTcPP-based [TcPP = the anion of meso -tetra(4-carboxyphenyl)porphyrin] polymeric system, 1, as a hydrogen evolution reaction (HER) electrocatalyst in acidic aqueous media. Abstract : Herein, we report a crystalline CoTcPP-based [TcPP = the anion of meso -tetra(4-carboxyphenyl)porphyrin] polymeric system, 1, as a hydrogen evolution reaction (HER) electrocatalyst in acidic aqueous media. The material was characterized by powder X-ray diffraction (p-XRD), Fourier transform infrared (FT-IR) spectroscopy, and energy dispersive X-ray (EDX) analysis and its morphology was probed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Polymer1 shows a surface area of 441.74 m 3 g −1, while the discrete CoTcPP molecule (2 ) shows a surface area of 3.44 m 3 g −1 . The HER catalytic performance was evaluated by means of linear sweep voltammetry in the presence of 0.5 M H2 SO4 aqueous solution. To achieve 10 mA cm −2 cathodic current density, 1 and2 respectively require an overpotential of 0.475 V and 0.666 V, providing strong evidence that the extended network of cobalt-based porphyrin leads to enhanced HER efficiency. The polymer also shows great tolerance for HER electrolysis in the presence of an acid remaining active over 10 hours.