Conductive CuCo‐Based Bimetal Organic Framework for Efficient Hydrogen Evolution

Abstract

Metal–organic frameworks (MOFs) with intrinsically porous structures and well‐dispersed metal sites are promising candidates for electrocatalysis; however, the catalytic efficiencies of most MOFs are significantly limited by their impertinent adsorption/desorption energy of intermediates formed during electrocatalysis and very low electrical conductivity. Herein, Co is introduced into conductive Cu‐catecholate (Cu‐CAT) nanorod arrays directly grown on a flexible carbon cloth for hydrogen evolution reaction (HER). Electrochemical results show that the Co‐incorporated Cu‐CAT nanorod arrays only need 52 and 143 mV overpotentials to drive a current density of 10 mA cm−2 in alkaline and neutral media for HER, respectively, much lower than most of the reported non‐noble metal‐based electrocatalysts and comparable to the benchmark Pt/C electrocatalyst. Density functional theory calculations show that the introduction of Co can optimize the adsorption energy of hydrogen (ΔGH*) of Cu sites, almost close to that of Pt (111). Furthermore, the adsorption energy of water (ΔEH2O) of Co sites in the CuCo‐CAT is significantly lower than that of Cu sites upon coupling Cu with Co, effectively accelerating the Volmer step in the HER process. The findings, synergistic effect of bimetals, open a new avenue for the rational design of highly efficient MOF‐based electrocatalysts.

Fe–Ni–Co trimetallic oxide hierarchical nanospheres as high-performance bifunctional electrocatalysts for water electrolysis

“…2k) show bright ring patterns matching (111), (220), (311), and (222), consistent with the XRD analysis. 31–33 The mapping plot of Fe–Ni–Co (Fig. 2l) illustrates the uniform distribution of Ni, Co, and Fe elements in the samples, consistent with the EDX analysis (Fig.…”

Cu/Ni-NiOx Nanoparticles Distributed on Graphene as Catalysts for the Methanolysis of Ammonia Borane to Produce Hydrogen

“…In this G-Cu/0.5-Ni-NiO x catalyst structure, G ensured good dispersibility of catalyst NPs. The Cu component constituted the real catalytically active site . The Ni-NiO x component grown on the surface of Cu NPs acted as a protective layer and coordination site, , which can simultaneously enhance the antioxidant performance of copper NPs and ensure the effective adsorption of AB molecules and the generation of H 2 .…”

Electrocatalysis in Room Temperature Sodium‐Sulfur Batteries: Tunable Pathway of Sulfur Speciation

“…The transition metal Cu has also achieved a wide range of applications in the field of electrocatalysis, such as HER, CO 2 RR, and LiS battery. [115][116][117] Based on this, Cu SA with two N atoms and two O atomic coordination were employed to sulfur host materials (Cu SA/NOC/S), which expressed a high S loading (67 wt%). [113] These Cu SA were uniformly dispersed on the carbon substrate, as shown in the HAADF-STEM image (Figure 7i).…”