Journal
DALTON TRANSACTIONS
Volume 46, Issue 32, Pages 10657-10664Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt00780a
Keywords
-
Categories
Funding
- State of North Carolina
- National Science Foundation [ECCS-1542015]
Ask authors/readers for more resources
Extensive research has been conducted with the goal to find a single bandgap material that can absorb visible light and efficiently drive the catalysis of water to both hydrogen and oxygen. The p-type MnV2O6 (C2/m, Z = 2, a = 9.289 angstrom, b = 3.535 angstrom, and c = 6.763 angstrom, beta = 112.64 degrees), synthesized via solid-state techniques, was investigated for its potential use in the visible-light photocatalysis of water. Mott-Schottky analysis was used to experimentally determine the energetic positions of the valence and conduction bands as +0.985 V and -0.464 V, respectively, at pH 5.68 vs. RHE. These are found to be suitable potentials to drive the reduction and oxidation of water under irradiation. The bandgap transitions, probed using spin-polarized density functional calculations, consist of the excitation of electrons from the half-filled Mn 3d(5) orbitals to the empty V 3d(0) orbitals. Both hydrogen and oxygen gas were observed as products during suspended-particle photocatalysis experiments under visible-light irradiation. The rate and total moles of gas produced were found to increase with the reaction temperature. As the temperature was raised from 30 degrees C to 37 degrees C and 44 degrees C, the moles of hydrogen produced over 6 hours increased by similar to 1.5 and similar to 2.5 times. Only oxygen is produced in pure water, showing that methanol is needed to drive hydrogen production.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available