• TAO GENG

Articles written in Bulletin of Materials Science

• Facile synthesis of porous Co3O4 nanoplates for supercapacitor applications

Porous tricobalt tetraoxide (Co3O4) nanoplates with large aspect ratio have been obtained by annealing Co(OH)2 precursor nanoplates synthesized by a facile reflux method without the need for any template or surfactant. After the heat treatment, the as-obtained phase-pure Co3O4 nanoplates with a wellretained structure were applied as the electrode material for supercapacitors, and the sample exhibits excellent performance with a high specific capacitance of 225 F g–1 after 2000 charge–discharge cycles at 2 A g–1, corresponding to a retention of 97% of the initial capacitance.

• Co$_9$S$_8$ nanotubes: facile synthesis and application in the catalytic reduction of 4-nitrophenol

Co$_9$S$_8$ nanotubes have been successfully synthesized via a facile two-step solvothermal method without the assistance of any template or surfactant, using cobalt sulphate (CoSO$_4$·7H$_2$O), urea and sodium sulphide (Na$_2$S·9H$_2$O) as starting reactants, and deionized water and glycol as the reactive medium. The phase and the morphologyof the as-obtained product were characterized by means of powder X-ray diffraction, energy dispersive spectrometry and scanning electron microscopy. The result displays that the Co9S8 nanotubes have hexagonal crosssections,the diameter of the nanotubes is about 200 nm and the wall thickness is of 50 nm. The experiments showed that the Co$_9$S$_8$ nanotubes could be used as new-type catalysts for the reduction of 4-nitrophenol. It was found thatthe as-obtained Co$_9$S$_8$ nanotubes contributed to the best catalytic activity.

• Synthesis of Co$_3$O$_4$ nanocubes by hydrothermal route and their photocatalytic property

Monodispersed Co$_3$O$_4$ nanocubes were prepared by a simple hydrothermal route with sodium pentanesulphonate,employing Co(NO$_3$)$_2$·6H$_2$O and NH$_3$·H$_2$O (28 wt%) as the starting reactants.The final product was characterizedby powder X-ray diffraction, energy-dispersive X-ray spectrometry, scanning electron microscopy and transmission electronmicroscopy. The as-prepared Co3O4 nanocubes could photocatalytically degrade organic dye Rhodamine B under irradiation of 365 nm ultraviolet light.

• Study on the synthesis and photocatalysis of Ag$_3$PO$_4$ polyhedral microcrystals

The silver phosphate (Ag$_3$PO$_4$) sample was synthesized using Na$_3$PO$_4$, AgNO$_3$ and PEG-10000 as raw materials by the hydrothermal method. Its different morphologies were obtained by changing temperature and surfactant. And its structures and morphology were characterized by X-ray diffraction and field emission scanning electronmicroscopy. The result of the study indicated that after the heat treatment at 150$^{\circ}$C, the as-obtained Ag$_3$PO$_4$ polyhedral microcrystal’s diameter was about 4 $\mu$m. Meanwhile, it showed that using Ag$_3$PO$_4$ polyhedral microcrystals as photocatalysts, the photocatalytic degradation rate of methylene blue in aqueous solution was close to 98.5% after 25 min ofsunlight.

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020