17 research outputs found
Printed electrodes for flexible, light-weight solid-state supercapacitors – a feasibility study
New insights into Se/BiVO4 heterostructure for photoelectrochemical water splitting: a combined experimental and DFT study
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.Monoclinic clinobisvanite BiVO4 is one of the most promising materials in the field of solar
water splitting due to its band gap and suitable VBM position. We have carried out a
comprehensive experimental and periodic density functional theory (DFT) simulations of
BiVO4 heterojunction with Selenium (Se/BiVO4), to understand the nature of heterojunction.
We have also investigated contribution of Se to higher performance by effecting morphology,
light absorption and charge transfer properties in heterojunction. Electronic properties
simulations of BiVO4 shows that its VBM and CBM are comprised of O 2p and V 3d orbitals,
respectively. The Se/BiVO4 heterojunction has boosted the photocurrent density by three fold
from 0.7 to 2.2 mAcm-2
at 1.3 V vs. SCE. The electrochemical impedance and Mott-Schottky
analysis consequence favorable charge transfer characteristics which account for the higher
performance in Se/BiVO4 compared to the BiVO4 and Se. Finally, spectroscopic,
photoelectrochemical and DFT evident that Se makes a direct Z-scheme (band alignments)
with BiVO4 where the photoexcited electron of BiVO4 recombine with the VB of Se,
consequences electron-hole separation at Se and BiVO4, respectively as a result enhanced
photocurrent is obtained.The authors would like to thank the National University of Malaysia for the financial support
from grants GUP-2016-089. One of us (H.U) acknowledges the NOTUR supercomputing
facilities within the project nn4608
Electrocatalytic activity of CoFe2O4 thin films prepared by AACVD towards the oxygen evolution reaction in alkaline media
Development of steel substrates using surface integrated carbon nano-structures for supercapacitors
The issue of climate change and the ever increasing energy demand is the driving force for researching new efficient materials for energy storage and development of low-carbon methods for fabricating them. It is widely known that the majority of the CO2emissions originate from the iron and steel industry. The total world steel production is in excess of 10,000 billion tons, and on average, the steel industry produces 1.9 tons of CO2per ton of steel produced. Whilst there are many studies on the storage of CO2, it is more desirable to convert it into something useful with commercial value. [Continues.