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.