4.7 Article

Electrocatalysis of Oxygen Reduction Reaction in a Polymer Electrolyte Fuel Cell with a Covalent Framework of Iron Phthalocyanine Aerogel

Journal

ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 7, Pages 7997-8003

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00375

Keywords

ORR; fuel cell; aerogel; phthalocyanine; electrocatalysis; PGM-free

Funding

  1. Israeli Ministry of Energy, Israeli Ministry of Science, and the Israel Science foundation

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This study reports on the synthesis and characterization of an aerogel-based catalyst: iron phthalocyanine aerogel. The aerogel exhibits high catalytic activity and a large number of atomically dispersed catalytic sites. It shows excellent performance as an ORR catalyst under acidic conditions and demonstrates high power density and voltage in a proton exchange membrane fuel cell.
Carbon aerogels have been studied in the context of fuel cell electrodes mainly as catalyst support materials due to their high surface area, porosity, and electrical conductivity. Recently, aerogels composed solely of inorganic molecular complexes have shown to be promising materials for the electrocatalysis of oxygen reduction reaction (ORR). These aerogels consist of atomically dispersed catalytic sites. Herein, we report on the synthesis and characterization of an aerogel-based catalyst: iron phthalocyanine aerogel. It was synthesized by coupling of ethynyl-terminated phthalocyanine monomers and then heat-treated at 800 degrees C to increase its electrical conductivity and catalytic activity. The aerogels reported here were tested as catalysts for ORR in acidic conditions for the first time and found to have a ultra-high number of atomically dispersed catalytic sites (7.11 x 10(20) sites g(-1)) and very good catalytic activity (E-onset = 0.9 V vs RHE and TOF = 9.2 x 10(-3) e(-) s(-1) site(-1) at 0.8 V vs RHE). The iron phthalocyanine aerogel was also studied in a proton exchange membrane fuel cell, reaching a peak power density of 292 mW cm(-2) and an open circuit voltage of 0.83 V.

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