Abstract
Electrochemical preparation of hydrogen peroxide (H2O2) via the two-electron water oxidation reaction (2e−WOR) is a promising method. As a potential electrocatalyst for the 2e−WOR, antimony oxide (Sb2O3) exists in two different crystal systems, cubic and orthorhombic phases. The arrangements of surface atom structures of these two polymorphs are diverse, which would theoretically lead to different selectivity for the 2e−WOR. The cubic and orthorhombic Sb2O3 are synthesized in this work and their performances for H2O2 generation are systematically measured and compared. Our results show that the cubic Sb2O3 exhibits improved Faradic efficiency and production rate of H2O2 than the orthorhombic one. Density functional theory calculations suggest that the main characteristic facet of the cubic Sb2O3 is thermodynamically more favorable for the 2e−WOR than that of the orthorhombic Sb2O3.
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