Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 7, Pages 8755-8766Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c00107
Keywords
PEC; microwave-hydrothermal; Co3O4/In2O3; p-n heterojunction; reduction of Cr(VI)
Funding
- Science and Technology Project of Qingdao West Coast New Area [2020-91]
- Natural Science Foundation of Shandong Province [ZR2019BEE075]
- Taif University, Taif, Saudi Arabia [TURSP-2020/135]
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Co3O4/In2O3 nanocomposites prepared via a microwave-hydrothermal method showed high efficiency and stability in reducing Cr(VI) through photoelectrocatalysis, with photo-generated electrons playing a key role and the p-n heterojunction significantly affecting the PEC performance.
Co3O4/In2O3 nanocomposites were prepared via a microwave-hydrothermal method and directly used as photoanodes for the photoelectrocatalytic (PEC) process to reduce Cr(VI). The as-prepared Co3O4/In2O3 composites show a rod-like structure, which is composed of nanoparticles. The PEC experiments indicated that after 120 min of irradiation with 0.7 V bias voltage and visible light, the Cr(VI) reduction efficiency of Co3O4/In2O3 composites in aqueous solution was 100%, which was superior to the samples prepared by other methods. Moreover, the Co3O4/In2O3 composite still had a high catalytic activity after five runs of PEC experiments. Elimination experiments demonstrate that photo-generated electrons (e(-)) performed a key role in the catalytic reduction of Cr(VI). The significantly improved PEC performance can be attributed to the bias voltage and the p-n heterojunction formed between Co3O4 and In2O3. Therefore, Co3O4/In2O3 nanocomposites have a considerable potential for the PEC reduction of Cr(VI).
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