Mechanochemically Synthesised Flexible Electrodes Based on Bimetallic Metal–Organic Framework Glasses for the Oxygen Evolution Reaction

Abstract

The melting behaviour of metal–organic frameworks (MOFs) has aroused significant research interest in the areas of materials science, condensed matter physics and chemical engineering. This work first introduces a novel method to fabricate a bimetallic MOF glass, through melt‐quenching of the cobalt‐based zeolitic imidazolate framework (ZIF) [ZIF‐62(Co)] with an adsorbed ferric coordination complex. The high‐temperature chemically reactive ZIF‐62(Co) liquid facilitates the formation of coordinative bonds between Fe and imidazolate ligands, incorporating Fe nodes into the framework after quenching. The resultant Co–Fe bimetallic MOF glass therefore shows a significantly enhanced oxygen evolution reaction performance. The novel bimetallic MOF glass, when combined with the facile and scalable mechanochemical synthesis technique for both discrete powders and surface coatings on flexible substrates, enables significant opportunities for catalytic device assembly.

Mechanochemical Modification of Oxygen/Nitrogen Species on Surface of Hard Carbon for Improved Sodium Storage

“…The chemical bond will be broken when the energy provided by the mechanical system is greater than the bond energy . Afterward, the reactive radicals or unsaturated dangling bonds with high residual energy constitute the new active surface, which could enhance the surface activity and facilitate the formation of O-/N-containing groups by reacting with nitrogen and oxygen from the air. , Specifically, the bond lengths decrease in the order CC (134 pm), CN (129 pm), and CO (120 pm). As a result, the CC bond energy (602 kJ mol –1 ) is lower than those of CN (615 kJ mol –1 ) and CO (799 kJ mol –1 ).…”

Binder-free mechanochemical metal–organic framework nanocrystal coatings

“…19 Co-ZIF-62 [Co(Im) 1.75 (bIm) 0.25 ] was synthesised by a liquidassisted mechanochemical synthesis method. 20 CoO (149.9 mg, 2.0 mmol), Im (238.3 mg), bIm (59.1 mg), NH 4 NO 3 (15.0 mg), DMF (150 µL), and 16.0 g zirconia balls were added into a 20 mL zirconia ball milling jar. The jars were capped by a gassing lid with valves and a seal ring.…”

Photoluminescent coordination polymer bulk glasses and laser-induced crystallization

“…In addition, the non-crystalline, high processability, and adhesive characteristics have gained research interest in both fundamental behaviors as well as applications such as ion conductive solid electrolytes, gas separation membranes, and electrochemical catalysis. [5][6][7][8][9][10] One of the most successful applications of glass, in general, is optics. The transparency and moldability of optically active glass materials have enabled many optical functionalities, including photoconductivity, photon up-conversion, and spectral concentration.…”