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Copper–Organic Framework Fabricated with CuS Nanoparticles: Synthesis, Electrical Conductivity, and Electrocatalytic Activities for Oxygen Reduction Reaction
Author(s) -
Cho Keumnam,
Han SungHwan,
Suh Myunghyun Paik
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201607271
Subject(s) - nanoparticle , porosity , electrical resistivity and conductivity , electron transfer , conductivity , current density , copper , chemical engineering , metal organic framework , catalysis , materials science , nano , chemistry , inorganic chemistry , nanotechnology , metallurgy , composite material , organic chemistry , physics , adsorption , quantum mechanics , electrical engineering , engineering
Abstract To apply electrically nonconductive metal–organic frameworks (MOFs) in an electrocatalytic oxygen reduction reaction (ORR), we have developed a new method for fabricating various amounts of CuS nanoparticles (nano‐CuS) in/on a 3D Cu–MOF, [Cu 3 (BTC) 2 ⋅(H 2 O) 3 ] (BTC=1,3,5‐benzenetricarboxylate). As the amount of nano‐CuS increases in the composite, the electrical conductivity increases exponentially by up to circa 10 9 ‐fold, while porosity decreases, compared with that of the pristine Cu‐MOF. The composites, nano‐CuS( x wt %)@Cu‐BTC, exhibit significantly higher electrocatalytic ORR activities than Cu‐BTC or nano‐CuS in an alkaline solution. The onset potential, electron transfer number, and kinetic current density increase when the electrical conductivity of the material increases but decrease when the material has a poor porosity, which shows that the two factors should be finely tuned by the amount of nano‐CuS for ORR application. Of these materials, CuS(28 wt %)@Cu‐BTC exhibits the best activity, showing the onset potential of 0.91 V vs. RHE, quasi‐four‐electron transfer pathway, and a kinetic current density of 11.3 mA cm −2 at 0.55 V vs. RHE.