English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The hybrid structure of nanoparticles (NPs) with nanosheets has the advantage of both anisotropic properties of NPs and large specific surface areas of nanosheets, which is desirable for many technological applications. In this study, MgCr 2 O 4 spinel NPs decorated on highly porous MgO nanosheets forming MgO/MgCr 2 O 4 ( x) nanocomposites were synthesized by a one pot coprecipitation method followed by a heat treatment process of the solvated wet gel of MgCr-LDH with polar solvent N, N-dimethylformamide (DMF) at 400 °C. This novel synthetic methodology generates materials consisting of porous metal oxides nanosheets adhered with spinel phase NPs due to the slow generation of gases such as H 2 O, CO 2 , and NH 3 under moderate temperature during the heat treatment process. The synergistic effect of much wider band gap MgO nanosheets and narrow band gap MgCr 2 O 4 NPs added increased stability due to the stronger bonding coordination of MgCr 2 O 4 NPs with MgO nanosheets. The obtained MgO/MgCr 2 O 4 ( x) nanocomposites possess large specific surface areas, highly porous structure, and excellent interface between MgCr 2 O 4 NPs and MgO nanosheets, which proved from N 2 sorption isotherm, TEM, HR-TEM study. With metallic ratio of MgCr3:1, MgO/MgCr 2 O 4 (MgCr3:1) nanocomposites exhibit highest H 2 evolution rate of 840 μmolg -1 2h -1 , which was 2 times higher than that of pure MgCr 2 O 4 (420 μmolg -1 2h -1 ). The LSV measurement study of MgO/MgCr 2 O 4 (MgCr3:1) nanocomposite shows an enhancement of light current density of 0.22 μA/cm 2 at potential bias of -1.1 V. The Mott-Schottky analysis suggested the band edge positions of the n-type constituents and formation of n-n type heterojunctions in MgO/MgCr 2 O 4 (MgCr3:1) nanocomposite, which facilitates the flow of charge carriers. The EIS and Bode phase plot of MgO/MgCr 2 O 4 (MgCr3:1) nanocomposite signifies the lower interfacial charge transfer resistance and higher lifetime of electrons (2.7 ms) for enhanced H 2 production. Lastly, the enhanced photocatalytic H 2 production activity and long-term stability of MgO/MgCr 2 O 4 (MgCr3:1) could be attributed to maximum specific surface area, porous structure, close intimacy contact angle between two cubic phases of MgCr 2 O 4 NPs and MgO nanosheets, abundant oxygen vacancies sites, reduced charge transfer resistance and suitable band edge potential to drive the thermodynamic energy for H 2 production. This work highlighted an effective strategy for the synthesis of cost-effective 2D porous heterojunctions nanocomposite photocatalyst for promising applications in the field of clean H 2 production utilizing abundant solar energy.

inorganic chemistry

Topotactic Transformation of Solvated MgCr-LDH Nanosheets to Highly Efficient Porous MgO/MgCr2O4Nanocomposite for Photocatalytic H2Evolution