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Download fileEngineering Cationic Sulfur-Doped Co3O4 Architectures with Exposing High-Reactive (112) Facets for Photoelectrocatalytic Water Purification
journal contribution
posted on 2021-02-10, 17:35 authored by Yanwei Di, Chun Ma, Yinghuan Fu, Xiaoli Dong, Xinghui Liu, Hongchao MaPromoting
the generation of intermediate active species (superoxide
radical (•O2–)) is
an important and challenging task for water purification by photoelectrocatalytic
(PEC) oxidation. Herein, we have constructed hierarchical cationic
sulfur-doped Co3O4 architectures with controllable
morphology and highly exposed reactive facets by introducing l-cysteine as a capping reagent and sulfur resource via a one-step
hydrothermal reaction. The as-obtained cationic sulfur (1.8 mmol l-cysteine) source doped Co3O4 (SC-1.8)
architectures with highly exposed (112) facets exhibited superior
PEC activities and long-term stability (∼25,000 s) in 1.0 mol·L–1 sulfuric acid for an accelerated reactive brilliant
blue KN-R degradation test. Our experimental and theoretical results
confirmed that the superior PEC performance of the SC-1.8 architectures
could be ascribed the following factors: (1) the highly exposed reactive
(112) facets of SC-1.8 promoted carrier transport and diffusion during
the PEC process and facilitated separating the electron/hole pairs
and producing the predominant active species (•O2–) compared with currently used other electrodes.
(2) Cationic sulfur doped on the lattice of Co3O4 can narrow the band gap to extend the photoadsorption range and
improve the lifetime of •O2– to enhance the PEC efficiency. This work not only proves that the
SC-1.8 architectures with highly exposed (112) facets are a promising
PEC catalyst due to increasing the electron transport and the lifetime
of active species but also presents a new strategy for constructing
an active PEC catalyst.