Bilayered ZnO/Nb₂O₅ photoanode for dye sensitized solar cell

Abstract

Nb2O5 layer were deposited on ZnO by using doctor blade method. The preparation of a bilayered ZnO/Nb2O5 photoanode was introduce for dye-sensitized solar cell (DSSC) application. Deposition of Nb2O5 layer on ZnO film improves power conversion efficiency of DSSCs. The ZnO/Nb2O5photoanode-based DSSCs show increase in photocurrent, open circuit voltage and conversion efficiency. The ZnO/Nb2O5 solar cell provides 50 mV increase of open circuit voltage, [Formula: see text] increment in current density and [Formula: see text] increment in efficiency as compare to ZnO-based DSSCs. We further analyzed the electron recombination properties of ZnO and ZnO/Nb2O5 by utilizing electrochemical impedance spectroscopy (EIS). The EIS analysis (Bode Plot) for ZnO/Nb2O5 photoanode show shifting of the peak related to electron recombination towards low frequency as compared to ZnO photoanode. Thus, there is an increase in lifetime of electrons in the ZnO/Nb2O5 photoanode, confirming that the recombination reactions are reduced in ZnO/Nb2O5 photoanode as compared to the ZnO.

Composites of Platinum-Iridium Alloy Nanoparticles and Graphene Oxide for the Dimethyl Amine Borane (DMAB) dehydrogenation at ambient conditions: An Experimental and Density Functional Theory Study

“…Moreover, electrophilicity, chemical potential, electronegativity, chemical hardness, adsorption enthalpy, and HLG values were computed for both spin down and spin up molecular orbitals (β and α molecular orbitals respectively). The results given in Table 1 are optimized for PtIr@GO composites/DMAB system and were found using the HOMO/LOMO data 50,51 . In here, the values were computed by using Eqs 4–7 where and for PtIr@GO composites/DMAB system.…”

“…Additionally, the hemical potential value was calculated by using Eq. 5 where of free DMAB (donor) and of the cluster (acceptor) 50–54 .…”

“…Before DMAB adsorption, chemical potential values for α and β molecular orbitals were calculated to be 117.7 and 118.7 respectively by using Eq. 5 where of free DMAB (donor) and of the cluster (acceptor) 50–54 . These data indicate that PtIr@GO cluster has a large chemical potential value for interaction with DMAB molecule.…”

Use of silica-based homogeneously distributed gold nickel nanohybrid as a stable nanocatalyst for the hydrogen production from the dimethylamine borane

“…Furthermore, chemical potential, ∆E, and ∆G, chemical hardness, electronegativity, electrophilicity, and HLG values were computed for both α and β molecular orbitals (spin up and spin down, respectively). These values which have been tabulated in Table 2 were calculated by using the HOMO/LUMO values of the optimized AuNi@SiO 2 cluster-DMAB system 38,39 . For the optimized AuNi@SiO 2 cluster-DMAB structure, the values were calculated employing equations 4 www.nature.com/scientificreports www.nature.com/scientificreports/ that AuNi@SiO 2 cluster has a high value of chemical potential for the DMAB molecule interaction.…”

“…LOMOof the AuNi@SiO 2 cluster21,[38][39][40][41] .Before the DMAB molecule adsorption, the values of chemical potential for α and β molecular orbitals (MOs) have been computed as −151.0 and −156.3 respectively by using equation 5 in Supporting Information where…”