Anchoring CuO Nanoparticles On C, N‐Codoped G‐C₃N₄ Nanosheets from Melamine‐Entrapped MOF Gel for High‐Efficiency Oxygen Evolution

Abstract

Facile engineering of transitional metal oxide nanoparticles (NPs) homogeneously anchored on graphitic carbon nitride (g‐C3N4) is very important. Herein, we develop a rapid and facile route to synthesize CuO NPs‐ and C, N‐codoped g‐C3N4 nanosheets grown on Ni foil (CuO/CN−C3N4/Ni‐f), derived from the oxidation‐pyrolysis of melamine‐entrapped Cu(II)‐MOF gel in the air. A detailed growth process for the hierarchical structure is studied. The obtained hierarchical structure without any binders used directly as an electrode only needs an overpotential of 223 mV to achieve a current density of 50 mA cm−2 in 0.5 M KOH, implying its highly efficient electrocatalytic activity. Notably, this material also exhibits strong long‐term durability. Free energy calculations show that the intrinsic origin of the outstanding activity is derived from sufficient exposure of active sites for CuO NPs anchored on the nanosheets and high N content.

Electrochemical performance of zinc carbodiimides based porous nanocomposites as supercapacitors

“…3f). Besides, it is clearly that the interfaces between ZnNCN/carbon and g-C 3 N 4 is seamlessly contacted, which may due to the in-situ forming process of g-C 3 N 4 [43]. Energy-dispersive X-ray spectroscopy (EDS) and elemental mapping were performed in Fig.…”

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

“…As a result, a small overpotential of 320 mV was required to reach a current density of 10 mA/cm 2 with a low Tafel slope of 63.1 mV/dec (Figure 6E,F). In another investigation, Zhao et al 79 prepared a CuO on the C‐ and N‐doped g‐C 3 N 4 (CuO/CN‐C 3 N 4 /Ni‐f) derived from melamine‐entrapped Cu‐based MOF for electrochemical OER catalysis. CuO/CN‐C 3 N 4 showed very low requiring overpotential of 233 mV to reach 50 mA/cm 2 and a Tafel slope of 59.4 mV/dec.…”

Synergistic catalysis of graphitic carbon nitride supported bimetallic sulfide nanostructures for efficient oxygen generation

“…(3) The g-C 3 N 4 is an efficient electrocatalyst carrier toward OER, which may provide a mass transport channel for oxygen-containing active intermediates, i.e. *OH, *O, *OOH and O 2 et al 30 (4) The incorporation of a large amount of electron-accepting pyridinic N-atoms present in g-C 3 N 4 is another important factor that favors the OER performance of Ni 3 S 2 /MoS 2 /20g-C 3 N 4 by facilitating the electron transfer and the adsorption/activation/desorption behaviors of oxygen species. 31 Accordingly, the major active centers may contain Ni 3 S 2 and/or in situ generated nickel (oxy)hydroxide catalytic active sites as well as the synergy initiatives from MoS 2 and g-C 3 N 4 to promote the chemisorptions of oxygen-containing active intermediates, resulting in an improved electrocatalytic OER performance.…”