Self-Growing MZIF8/GDE Bonding by N–Zn–O Boosts Electrochemical Oxygen Reduction to H₂O₂

Abstract

The two-electron oxygen reduction reaction (2e– ORR) is an environmentally friendly approach to the production of H2O2. Self-growing gas diffusion electrodes offer a lot of advantages like reduction of adhesive use, and lower electron and mass transfer resistance. However, MOF self-growing gas diffusion electrodes are rarely used for the production of hydrogen peroxide. Herein, a self-growing hydrophobic composite gas diffusion electrode has been proposed, consisting of densely distributed MZIF8 and graphite felt support (MGF). MGF performs well in a wide range of pH and potential; the H2O2 yields in 0.5 M Na2SO4 and 0.1 M KOH are 980.86 and 981.74 mg·L–1·h–1, respectively. In addition, the highest Faraday efficiencies achieved by MGF in the two solutions are 85.75% and 89.88%, respectively. This significant performance is attributed to the hydrophobic microenvironment and the ordered distribution of the N–Zn–O bond located between the MZIF8 and graphite felt support. This work presents a promising method for the production of H2O2 with high selectivity, simple preparation, low cost, and wider application.

Advanced MnOx/MnWO4 hetero-nanoflakes with abundant oxygen vacancies for high-performance flexible asymmetric supercapacitors with high energy density

“…In addition, the higher content of Mo 3+ means the higher oxygen vacancy content. [29][30][31] Fig. 3d shows the highresolution O 1s spectra of MnO x /MnWO 4 @C-3 composites, which reveal three typical peaks at 530.87, 532.37 and 530.35 eV, representing lattice oxygen (O1), oxygen vacancy (O2) and oxygen species adsorbed on the surface (O3), respectively.…”

Metal–organic frameworks for electrocatalytic hydrogen peroxide production

“…More recently, Wang et al 61 reported a MZIF8/graphite felt support (GF) composite (denoted as MGF) for the 2e-ORR using a microwave assisted route (Fig. 8(a)).…”

Kinetics of Redox Half-Cycles on Bi2O3 for the Selective Catalytic Combustion of Hydrogen

“…9,10 A novel application of chemical looping, which has gained renewed interest, 11−15 is selective hydrogen combustion (SHC), in which hydrogen is selectively oxidized in a mixture of hydrocarbons. A strategy to surpass thermodynamic limitations in endothermic reactions, such as the catalytic dehydrogenation of ethylbenzene 12,16 or propane, 13 involves coupling of the dehydrogenation reaction with an exothermic SHC step to enable autothermal reactor operation.…”