Synthesis of Porous Carbon‐coated Cobalt Catalyst through Pyrolyzing Metal–Organic Framework and their Bifunctional OER/ORR Catalytic Activity for Zn‐Air Rechargeable Batteries

Abstract

A metal–organic framework (MOF) was synthesized using 4,4′‐stilbenedicarboxylic acid (H2SDA) in dimethylformamide (DMF). Carbon‐coated Co (C@Co) catalysts were prepared by the direct calcination of Co3(SDA)3(DMF)2 MOF crystals at various temperatures. The highest surface area of the C@Co catalyst is obtained at 600 °C which can further be increased by the ball mill operation. The X‐ray photon spectroscopy and X‐ray diffraction analysis proved the formation of metallic Co in the carbon matrix at temperatures over 500 °C, while Co3O4 formation was observed at 500 °C. Furthermore, the graphitic properties of the Co particles were analyzed by Raman spectroscopy. The durability of the carbon‐coated Co catalysts derived from MOFs (C@Co catalysts) was analyzed by the cycle test (charge/discharge at 20 mA/cm2 per 2 h) and was retained over 350 h. These catalysts showed remarkable stability for both ORR (oxygen reduction reaction) and OER (oxygen evolution reaction), comparable to that of Co3O4 and Co metal powder in alkaline solution.

Strategies in Metal–Organic Framework‐based Catalysts for the Aerobic Oxidation of Alcohols and Recent Progress

“…Simultaneously, the perfect heterogeneity of MOFs allows easy separation and high reusability when applied to organic reactions. In addition, the excellent tunability of MOFs can be used to introduce additional catalytic species onto their structures 8 . Therefore, MOFs are considered important multifunctional, catalytic platforms for organic transformations 9…”

Hierarchical Porous Carbon Materials Prepared by Direct Carbonization of Metal–Organic Frameworks as an Electrode Material for Supercapacitors

“…[8][9][10][11][12][13] Notably, carbonization using a MOF precursor as a template as well as a carbon source can considerably enhance the stability and conductivity of resulting carbon materials which may be useful in electrochemical applications such as supercapacitors. [13][14][15] Compared to the conventional methods, the MOF-derived synthetic strategy has several benefits in the fabrication of porous carbon materials: (1) it is possible to synthesize the materials with inherent diversity providing precise control over porosity, (2) in contrary to inorganic templates, MOFs contain organic ligands in the frameworks and therefore require no additional carbon source at least in principle, and (3) direct carbonization of MOFs with nitrogen-containing moieties may allow the formation of nitrogen-doped porous carbons, which can improve the electrochemical properties of the materials. Therefore, the use of MOFs as templates is one of the efficient ways to prepare porous carbon materials for electrochemical applications.…”

Rational Design of Metal–Organic Framework‐Based Materials for Advanced LiS Batteries

“…[21][22][23] Moreover, MOFs are utilized as a sacrificial-template for a wide range of nano-and microstructures with compositional and structural divergence. [24][25][26][27][28][29] The versatility of MOF-based materials, as reflected by MOFs, MOF-derived hybrids (MDHs), MOF-derived carbons (MDCs), enables MOF-based materials to serve a design platform for fabricating cathodes and separators with desirable properties that address the aforementioned issues of Li S batteries. 30,31 Here, we provide a new insights into the design of MOF-based materials for Li S batteries by categorizing the literature with respect to material function, rather than by material synthesis or cell components as done in several other reviews.…”