Philips O. Agboola

Howard Payne University

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Imran Shakir

Islamic University of Madinah

Muhammad Farooq Warsi

Islamia University of Bahawalpur

Sonia Zulfiqar

University of Ostrava

Muhammad Suleman

University of Swat

Sana Munir

Islamia University of Bahawalpur

Anwar Ali Shad

The University of Agriculture, Peshawar

Sajjad Ahmad

Government College University, Lahore

Yuchun Ren

University of Electronic Science and Technology of China

Qingquan Kong

Chengdu University

Luchao Yue

North University of China

Cooperative Institutions

Islamia University of Bahawalpur

Chengdu University

University of Electronic Science and Technology of China

Sichuan University

King Saud University

Sungkyunkwan University

University of Agriculture Faisalabad

Chinese Academy of Sciences

Shandong Normal University

The University of Agriculture, Peshawar

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Synthesis of Ultrathin MnO₂ Nanowire-Intercalated 2D-MXenes for High-Performance Hybrid Supercapacitors

Energy & Fuels (2021)

M. Faishal Mahmood Aamir Rasheed Imtisal Ayman Tabinda Rasheed Sana Munir

Recently, the MXene itself and its composites with various metal oxides have shown excellent electrochemical performance due to the presence of multiple oxidation states. However, the restacking of MXene layers and poor electrical conductivity of metal oxides are major bottlenecks in their effective electrochemical transport, when they are applied individually. Herein, we report a novel manganese oxide/MXene (MnO2/MXene) composite material to overcome these critical issues. Sub-50 nm-thick MnO2 nanowires (NWRs) were introduced inside the MXene to effectively stop the restacking as well as to increase the surface area of the supercapacitor (SC) electrode material. The special control on the thickness of NWRs is not only providing an opportunity to adjust them inside the MXene layers but also giving a high surface area. Electrochemical studies suggested that the MnO2/MXene composite behaves as an excellent electrode material for hybrid SCs, as compared to individual MXene and MnO2. Maximum specific capacitance (Csp) of MXene, MnO2 NWRs, and MnO2/MXene composite was observed to be about 527.8, 337.5, and 611.5 F/g, respectively. The calculated specific capacity of the MnO2/MXene composite was about 489.5 C/g at 1 A/g, which shows better performance as an electrode material for energy storage devices. The synthesized electrode material demonstrated excellent capacitance retention of about 96% up to 1000 cycles.

MXenes

Specific surface area

10.1021/acs.energyfuels.0c03939

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Al3+-substituted nanocrystalline Cu0.5Zn0.5AlxFe2-xO4 spinel ferrite onto the rGO sheets as green photocatalyst nano-heterostructured materials

Desalination and Water Treatment (2020)

Aqsa Riaz Rasheeda Bibi Sobia Jabeen Sonia Zulfiqar Philips O. Agboola

Nanocrystalline material

Zinc ferrite

10.5004/dwt.2020.25694

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Visible light irradiated photocatalytic activity of copper substituted CoMn2O4 nanoparticles

Desalination and Water Treatment (2021)

Nagina Bashir Humera Sabeeh Sonia Zulfiqar Anwar Ali Shad Muhammad Suleman

In the current investigation, copper substituted cobalt manganese spinel oxide (Cu x Co 1-x Mn 2 O 4 ) photocatalyst was prepared via the co-precipitation method.The synthesized nanoparticles were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier-transform infrared spectroscopy.The prepared Cu 0.2 Co 1-0.2 Mn 2 O 4 nanoparticle exhibited excellent photocatalytic activity for degradation of typical organic-based dye Methylene blue (MB).Furthermore, the comparative study of pure CoMn 2 O 4 and Cu-substituted CoMn 2 O 4 nanoparticles (NPs) towards the photocatalytic performance was also conducted.As compared to the CoMn 2 O 4 nanoparticles, the Cu x Co 1-x Mn 2 O 4 nanoparticles exhibited excellent photocatalytic capability for the degradation of MB dye.After 80 min of visible light irradiation, the decomposition of MB by Cu x Co 1-x Mn 2 O 4 nanoparticles was higher as compared to degradation MB dye in the presence of copper substituted CoMn 2 O 4 NPs.Copper substituted cobalt manganese oxide nano-photocatalyst was also used for comparative study.The Cu 0.2 Co (1-0.2) Mn 2 O 4 showed excellent (~86%) photocatalytic performance in contrast with Cu 0 CoMn (1-0) O 4 (22%), Cu 0.5 Co (1-0.5)Mn 2 O 4 (57), Cu 0.1 Co (1-0.1)Mn 2 O 4 (60%), Cu 0.15 Co (1-0.15)Mn 2 O 4 (73%) for the degradation of MB in visible light irradiation.The enhanced photocatalytic activity is mainly attributed to the optimized bandgap, which might have developed by the inclusion of copper ions into the CoMn 2 O 4 spinel oxide.The copper substitution not only contributed to the inhibition of photo-induced electron-hole pairs but also assisted a great redox capability.Cu x Co 1-x Mn 2 O 4 photocatalyst holds great potential for massive pollutant treatment due to the superb photocatalytic performance for organic pollutants.

Visible spectrum

10.5004/dwt.2021.27491

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A comparative study on photocatalytic activities of various transition metal oxides nanoparticles synthesized by wet chemical route

Desalination and Water Treatment (2021)

Muhammad Farooq Warsi Nusrat Shaheen Muhammad Ilyas Sarwar Philips O. Agboola Imran Shakir

Co-precipitation route was used to synthesize different oxides of transition metals nano photocatalysts (Fe 2 O 3 , MnO 2 , Co 3 O 4 , and ZnO).The crystal structure, morphology, and elemental composition confirmation were carried out energy dispersive X-ray spectroscopy through X-ray diffraction (XRD), field emission scanning electron microscopy, and EDXS techniques.XRD analysis results revealed that the transition metal oxides are highly pure and have a very small crystallite size.It was found that iron oxide and cobalt oxide nanostructures were cubic, whereas manganese oxide, and zinc oxide nanostructures have tetragonal crystal structures.Fourier transform infrared spectra were studied to further confirm and clarify the material's structure.Surface areas of the synthesized transition metal oxides nano photocatalysts were calculated through Brunauer-Emmett-Teller isotherms.The calculated optical band gap energy for different metal oxides was between 2.02 and 2.7 eV.The nano photocatalysts were applied in the presence of aqueous methylene blue solution under visible light incandescence in order to set up the ascendancy of heterogeneous photocatalysis.It is observed that the photocatalytic efficiency of the oxides of transition metals simply depends upon the particle size of the nano-sized material and its surface area.It is concluded that iron oxide nano-photocatalyst reveals the best photocatalytic efficiency because of the high surface/charge ratio and variation in surface orientations.It is suggested that nano-sized iron oxides (Fe 2 O 3 ) is a propitious candidate to resolve environmental issues related to the poisonous ecosystem because it has a great potentiality in heterogeneous photo disintegration and can establish a better green environment.

Tetragonal crystal system

Cobalt oxide

10.5004/dwt.2021.26463

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Tailoring the properties of nanocrystalline multiferroic BiFeO3 by simultaneous substitution of Bi3+ and Fe3+ metal cations for enhanced visible-light-driven photocatalysis

Desalination and Water Treatment (2019)

Sajjad Ahmad Muhammad Suleman Sara Musaddiq Najeeb Al‐Khalli Philips O. Agboola

Multiferroic ceramics (BiFeO 3 ) co doped with Yb and Ni cations (Bi 1-x Yb x Ni y Fe 1-y O 3 ) were synthesized via micro-emulsion route.The dopant (Yb and Ni) contents were fixed x = 0.0 < x >0.125 and y = 0.0 < x >0.25 for six different compositions.The fabricated ceramics were examined with various techniques to index certain features such as crystal habitat, electrical, dielectric, magnetic, and photocatalytic properties.Fourier-transform infrared spectroscopy, X-ray diffraction (XRD), ultraviolet/visible spectroscopy, impedance analyzer constant, current-voltage (I-V) behavior, and vibrating sample magnetometer (VSM).XRD crews revealed a highly crystalline rhombohedral (R3c) structure growth on inclusion of ytterbium and nickel cations in BiFeO 3 ceramics.However, on substituent concentrations, x = 0.125, y = 0.25 moles, the diffraction pattern (111) against 2θ = 27° showed a phase transformation from rhombohedral to orthorhombic phase.Nanocrystalline morsels were harvested with sizes ~21-23 nm.The fabricated ceramics exhibited the resistivity 1.4 × 10 9 Ω cm -1 .The VSM analysis of fabricated ceramics revealed a notable enhancement of magnetization up to 1.51 emu/g for x = 0.1, y = 0.2 moles.The ceramic composition Bi 0.90 Yb 0.10 Ni 0.2 Fe 0.80 O 3 exhibited the minimum optical band gap 1.25 eV, and these particles showed the photocatalytic activity of >64%.The fabricated ceramic inherited magnetic merits and could be easily removed by applying conventional magnetic bar.

Nanocrystalline material

10.5004/dwt.2019.23562

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High-efficiency ammonia electrosynthesis on self-supported Co2AlO4 nanoarray in neutral media by selective reduction of nitrate

Chemical Engineering Journal (2022)

Zhiqin Deng Jie Liang Qian Liu Chaoqun Ma Lisi Xie

Electrosynthesis

Nanosheet

Ammonia production

10.1016/j.cej.2022.135104

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Citations (94)