Issue 18, 2024

A metal-free perylene–porphyrin based covalent organic framework for electrocatalytic hydrogen evolution

Abstract

A crystalline perylene–porphyrin based covalent organic framework is synthesized via Schiff base [2 + 2] type condensation between 4,4′,4′′,4′′′-(perylene-2,5,8,11-tetrayl) tetrabenzaldehyde (PETA) and 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (PAM) under solvothermal conditions. The porphyrin and perylene units occupy the vertex of a three-dimensional triclinic crystal in an alternate manner. PETA-PAM-COF exhibits permanent microporosity, a reasonably high surface area (about 1400 m2 g−1), and promising chemical stability. A conducting perylene bridged channel is created by AA stacking. PETA-PAM-COF has been utilized for the metal-free hydrogen evolution reaction with a low charge-transfer resistance (Rct) value of 62.22 Ω and a Tafel slope of 122 mV dec−1, demonstrating its potential for practical utilization. PETA-PAM COF showed a current density of 10 mA cm−2 at an overpotential of 261 mV. Remarkable HER activities are demonstrated by the PETA-PAM-COF catalyst as indicated by its faradaic efficiency (96%) and durability (which retained 93% of its original current density after 1000 cycles). We anticipate that the imine-based COF will not only enhance the structural variety but also the electrochemical behavior of these classes of materials.

Graphical abstract: A metal-free perylene–porphyrin based covalent organic framework for electrocatalytic hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
21 Jun 2024
Accepted
20 Jul 2024
First published
22 Jul 2024

Sustainable Energy Fuels, 2024,8, 4183-4191

A metal-free perylene–porphyrin based covalent organic framework for electrocatalytic hydrogen evolution

S. Samanta, S. Khatun, I. Mukherjee, S. Maity, M. A. Addicoat and A. Pradhan, Sustainable Energy Fuels, 2024, 8, 4183 DOI: 10.1039/D4SE00829D

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