Metal–organic framework derived carbon-encapsulated hollow CuO/Cu₂O heterostructure heterohedron as an efficient electrocatalyst for hydrogen evolution reaction

Abstract

It is of pivotal significance to probe highly efficient, cost-effective and low-cost catalysts for hydrogen evolution reaction. Herein, closely packed carbon-encapsulated CuO/Cu2O heterohedron with heterojunction structure is reported that combines...

Cu-MOF-Derived C-Doped CuO/Cu2O Hollow Nano-Octahedrons for Room-Temperature NO2 Sensing at the ppb Level

“…The transfer resistance ( R ct ) values of C-doped CuO/Cu 2 O hollow nano-octahedrons prepared at different annealing times (20, 30, 40, 50, and 60 min) are 30,980, 21,769, 20,546, 38,581 and 39,907 Ω, respectively. By comparing the R ct of the sample, the C-doped CuO/Cu 2 O hollow nano-octahedrons-40 min (20,546 Ω) sensor shows the smallest value among all materials, indicating that the heterostructure provides more favorable catalytic kinetics and excellent electron transportability. , It is consistent with gas sensing performance measurements. With the change of the contents of CuO and Cu 2 O (Figures S2 and ), the C-doped CuO/Cu 2 O hollow nano-octahedrons-40 min formed the optimum heterojunction structure, and the contact interface between CuO and Cu 2 O nanoparticles may be the most.…”

In Situ Design of a Nanostructured Interface between NiMo and CuO Derived from Metal–Organic Framework for Enhanced Hydrogen Evolution in Alkaline Solutions

“…revealed two peaks located at 530.85 and 531.95 eV, which could correspond to lattice oxygen from CuO and defect centers originating from oxygen deficiency and/or surfaceabsorbed H 2 O/O−H. 6 As evident, one of the O 1s XPS peaks disappears after heat treatment, indicating the cleavage of C− O/C�O bonds from the Cu-MOF structure.…”

“…Despite its promise, the overall energy efficiency of EWS faces a significant setback due to the sluggish kinetics of the hydrogen evolution reaction (HER) under alkane conditions. Thus, it is vital to create catalysts that excel in performance while being highly efficient for a sustainable future. , Over the past decade, a wave of exploration has unfolded in the realm of electrocatalysis, wherein first-row transition metals like Fe, Co, and Ni have taken center stage as excellent candidates for the EWS. Regrettably, the vibrant domain of Cu-based catalysts, endowed with their earth-abundant nature, has remained relatively unexplored when it comes to unraveling their intricate electrocatalytic properties …”

Stabilization of transition metal heterojunctions inside porous materials for high-performance catalysis

“…High-temperature thermal treatment of MOFs can create ordered porous carbon materials consisting of confined tran-sition metal heterojunctions. [111][112][113] Attributable to the periodic distribution of metal nodes and organic moieties in MOFs, the metal active species generated are uniformly dispersed, while the stability of the metal heterojunctions is strongly improved. [114][115][116] Large specific surface areas derived from MOFs favour mass transport, while the good electron mobility of carbon materials can facilitate charge transfer.…”