Facile Synthesis and Characterization of MOF‐Derived Porous Co₃O₄ Composite for Oxygen Evolution Reaction

Abstract

Oxygen evolution reaction (OER) has gained wide attentions due to its important role in hydrogen production. Being one of the half reactions, the water oxidation was proved to be the key step to restrain the overall of water splitting. Herein, Co3O4 composites were successfully obtained by directly annealing a MOF‐derived Co complex under air condition. The Co3O4 complex with a surface area of 34.7 m2/g and wider pore size distribution obtained at 350°C was found to be the most active OER catalyst in 1 M KOH, an overpotential of 420 mV@10 mA/cm2 with a Tafel slope of 55 mV/dec was detected. This simple and inexpensive approach makes it become a new candidate for OER.

State of the Art and Prospects in Metal–Organic Framework (MOF)-Based and MOF-Derived Nanocatalysis

“…Numerous Co-based MOF electrocatalysts for OER have recently emerged. ,,− NC@Co–NGC DSNCs with NC as inner shell and Co-NGC as outer shell (Figure ) was fabricated by Zhao and Qiu’s group . The hybrid nanocages involve closely packed double shells comprising a ZIF-8-derived inner shell of N-doped microporous carbon (NC) and a ZIF-67-derived outer shell of codecorated N-doped mesoporous graphitic carbon (Co-NGC), noted NC@Co–NGC DSNCs .…”

Metal‐organic frameworks‐derived novel nanostructured electrocatalysts for oxygen evolution reaction

“…Nevertheless, the synthesis procedure involves relatively complicated processes compared to other cobalt oxides. Gong et al 55 synthesized MOF‐derived porous Co 3 O 4 composites (Co 3 O 4 ‐350°C) for OER catalysis in a rather facile and simplified preparation step. The Co 3 O 4 ‐350°C composite was successfully produced by calcination of the MOF‐derived Co complex.…”

Evolution of metal organic frameworks as electrocatalysts for water oxidation

“…One such OER electrocatalyst synthesized by annealing of a Co based MOF under air, was reported by Gong et al, where the active unit was Co 3 O 4 . 136 Apart from this, carbonization (under N 2 , H 2 , He), 137 thermal phosphidization, thermal sulphization, etc., can also result in further functional tuning. Employment of these techniques can help in the construction of various interesting structures, like functionalized carbon nano tubes, 138 metal oxides embedded amorphous carbon matrix, porous nano-cages, 139 double shell nano cages, 140 etc., which can act as OER electrocatalysts.…”