New Publication: Bimetal-organic framework derived multi-heterostructured TiO2/CuxO/C nanocomposites with superior photocatalytic H2 generation performance

Congratulations to final year PGR Zahid Hussain for his new publication ‘Bimetal-organic framework derived multi-heterostructured TiO2/CuxO/C nanocomposites with superior photocatalytic H2 generation performance’, which was recently published in Journal of Materials Chemistry A (JMCA).

In this work, In-situ formation of p-n heterojunctions between TiO2 and CuxO in heteroatoms-doped carbon nanocomposites and their applications in photocatalytic H2 evolution were demonstrated. One-step pyrolysis of bimetal-organic-frameworks NH2-MIL-125(Ti/Cu) in water steam at 700 ºC forms phasejunction between nitrogen/carbon co-doped anatase and rutile TiO2, accompanied by the formation of CuxO heterostructures. Moreover, p-n heterojunction is also formed between TiO2/CuxO nanoparticles. These multi-heterostructures are embedded in N-containing and hydrophilic carboxyl functionalised carbon. The optimised TiO2/CuxO/C composites absorb more visible light and offer multiple pathways for photoinduced electrons and holes migration. Also, these nanocomposites provide increased active sites for photocatalytic reactions. Without loading expensive noble metals, TiO2/CuxO/C nanocomposites exhibited superior photocatalytic H2 generation activity of 3298 µmol gcat-1 h-1 under UV-Visible light, 40 times higher than commercial TiO2. This work offers a simple approach to fabricate novel photocatalytic nanocomposites for efficient H2 generation.

Zahid’s previous publications include a translation of Carlo Rovelli’s “Seven Brief Lessons on Physics” into Urdu and ‘Surface functionalized N-C-TiO2/C nanocomposites derived from metal-organic framework in water vapour for enhanced photocatalytic H2 generation’ , of which he was lead author, published in Journal of Energy Chemistry.

New Publication: ‘Surface functionalized N-C-TiO2/C nanocomposites derived from metal-organic framework in water vapour for enhanced photocatalytic H2 generation’

Congratulations to PGR Zahid Hussain, who is lead author of the paper  ‘Surface functionalized N-C-TiO2/C nanocomposites derived from metal-organic framework in water vapour for enhanced photocatalytic H2 generation’, published in the Journal of Energy Chemistry.

Zahid’s previous publications include ‘MOF Derived Porous ZnO/C Nanocomposites for Efficient Dye Photodegradation’
published in ACS Applied Energy Materials, and ‘Structural, optical, electronic and magnetic properties of multiphase ZnO/Zn(OH)2/ZnO2 nanocomposites and hexagonal prism shaped ZnO nanoparticles synthesized by pulse laser ablation in Heptanes’  published in Elsevier Materials Chemistry and Physics.

Abstract

In this work, we have successfully demonstrated that nitrogen/carbon co-doped (anatase and rutile) TiO2 phase junction nanoparticles, homogeneously distributed in N and carboxyl group functionalized porous carbon matrix can be synthesized via simple one-step pyrolysis of titanium-based metal-organic framework (Ti-MOFs), NH2-MIL-125(Ti). Introducing water vapour at high temperature during the pyrolysis of NH2-MIL-125(Ti) results in the functionalization of the carbon matrix with carboxyl groups as well as the creation of additional localized oxygen-rich N like interstitial/intraband states above the valence band of polymorphic TiO2 nanoparticles that further narrowed the energy bandgap. The derived N-C-TiO2/C phase junction composites retain the disc-like tetragonal morphologies and textural properties inherited from the NH2-MIL-125(Ti) precursor. Without loading any noble metal co-catalyst such as Pt, Au, Pd, the sample N–C-TiO2/CArW exhibits very promising photocatalytic H2 generation from water splitting.

Porous ZnO/Carbon nanocomposites derived from metal-organic frameworks for highly efficient photocatalytic applications – A correlational study

Congratulations to XM² PGR student (third year) Mian Zahid Hussain for his latest publication on “Porous ZnO/Carbon nanocomposites derived from metal-organic frameworks for highly efficient photocatalytic applications – A correlational study” in Carbon journal. Abstract below.

Abstract

Porous ZnO/C nanocomposites derived from 3 different Zinc based metal-organic frameworks (MOFs) including MOF-5, MOF-74 and ZIF-8, were prepared at high temperature under water-steam atmosphere and their performances in photocatalytic H2 evolution reaction (HER) and photodegradation of organic dye pollutants were evaluated. The formation mechanism from MOF precursors, the structural properties, morphologies, compositions and textural properties of the derived ZnO/C composites were fully investigated based on different characterization techniques and the correlation between the precursors and the derived composites was discussed. It is evident that MOF precursors determine the crystalline structures, doping profiles, thermal stabilities and metal oxide-carbon weight percentage ratios of the resulting composites.

The correlation between MOFs and their derived nanocomposites indicates that different parameters play unalike roles in photocatalytic performances. The desired properties can be tuned by selecting appropriate MOF precursors. MOF-5 derived porous ZnO/C nanocomposite not only exhibits the highest photocatalytic dye degradation activity under visible light among these MOFs, but also outperforms those derived from MOF-74 and ZIF-8 up to 9 and 4 times in photocatalytic HER respectively. This study offers simple and environmentally friendly approaches to further develop new homogeneously dispersed functional metal oxide/carbon composites for various energy and environment-related applications.

 

Zahid has previously published on ZnO nanocomposites studies, and is currently working on a translation of Carlo Rovelli’s book “Seven Brief Lessons on Physics” into Urdu.