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Efficient Photon Conversion via Double Charge Dynamics CeO2-BiFeO3 p-n Heterojunction Photocatalyst Promising toward N2 Fixation and Phenol-Cr(VI) Detoxification.
Mansingh, Sriram; Sultana, Sabiha; Acharya, Rashmi; Ghosh, M K; Parida, K M.
Affiliation
  • Mansingh S; Centre for Nano Science and Nano Technology, S 'O' A Deemed to be University, Bhubaneswar 751 030, Odisha, India.
  • Sultana S; Centre for Nano Science and Nano Technology, S 'O' A Deemed to be University, Bhubaneswar 751 030, Odisha, India.
  • Acharya R; Centre for Nano Science and Nano Technology, S 'O' A Deemed to be University, Bhubaneswar 751 030, Odisha, India.
  • Ghosh MK; Advanced Materials Technology Department and Hydro & Electrometallurgy Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, Odisha, India.
  • Parida KM; Centre for Nano Science and Nano Technology, S 'O' A Deemed to be University, Bhubaneswar 751 030, Odisha, India.
Inorg Chem ; 59(6): 3856-3873, 2020 Mar 16.
Article in En | MEDLINE | ID: mdl-32141738
ABSTRACT
For better exciton separation and high catalytic activity, the most trailblazing stratagem is to construct defect engineered low-dimensional p-n heterojunction framed photocatalytic systems. In this context, we have developed a rod-sheet (1D-2D) p-n heterojunction of MCeO2-BiFeO3 by a simple hydrothermal method and scrutinized its photocatalytic performance toward N2 fixation and phenol/Cr(VI) detoxification. The intimate contact between MCeO2 and BiFeO3 in the junction material is well established via X-ray diffraction (XRD), UV-vis diffuse reflectance spectrosopy (DRS), transmission electron microscopy (TEM), and photoelectrochemical studies. Further, scanning electron microscopy (SEM) and TEM pictures clearly support the decoration of MCeO2 nanorods over BiFeO3 sheets and also depict the junction boundary. Additionally, photoluminescence (PL), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and Raman measurements give solid evidence toward the presence of an oxygen vacancy. Moreover, the Mott-Schottky result indicates a feasible band edge potential favoring the p-n heterojunction with a built-in electric field between BiFeO3 and MCeO2 favoring a double charge dynamic. The MCeO2-BFO p-n junction displays a notable catalytic activity, i.e., 98.2% Cr(VI) reduction and 85% phenol photo-oxidation, and produces 117.77 µmol h-1 g-1 of ammonia under light irradiation. Electrochemical analysis suggests a four-electron/five proton-coupled N2 photoreduction pathway. The designed oxygen vacancy oriented p-n heterojunction suffering double charge migration shows significant catalytic performance due to effective electron-hole separation as justified via PL, electrochemical impedance spectra (EIS), and Bode phase analysis.

Full text: 1 Database: MEDLINE Language: En Journal: Inorg Chem Year: 2020 Type: Article Affiliation country: India

Full text: 1 Database: MEDLINE Language: En Journal: Inorg Chem Year: 2020 Type: Article Affiliation country: India