Syeda Ramsha Ali
@giki.edu.pk
Nanotechnology Research Laboratory, Faculty of Engineering Sciences
GIK Institute of
Engineering Sciences and Technology
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Syeda Ramsha Ali, Mian Muhammad Faisal, Shadai Lugo Loredo, S.K. Gadi, and K.C. Sanal
Elsevier BV
Syeda Ramsha Ali, Mian Muhammad Faisal, Soorya Pushpan, Nayely Pineda Aguilar, Karan Kishor Singh, Andrea Cerdán‐Pasarán, Mónica María Alcalá Rodríguez, Eduardo M. Sánchez, A. Torres Castro, Shadai Lugo Loredo,et al.
Wiley
Meshal Alzaid, Muhammad Zahir Iqbal, S.R. Ali, M.M. Faisal, N.M.A. Hadia, and A. Tozri
Elsevier BV
Mian Muhammad Faisal, Syeda Ramsha Ali, Syed Shaheen Shah, Muhammad Waqas Iqbal, Soorya Pushpan, Md. Abdul Aziz, Nayely Pineda Aguilar, Mónica María Alcalá Rodríguez, Shadai Lugo Loredo, and K.C. Sanal
Elsevier BV
Syeda Ramsha Ali, Muhammad Zahir Iqbal, Mian Muhammad Faisal, and Meshal Alzaid
Wiley
Mian Muhammad Faisal, Syeda Ramsha Ali, Soorya Pushpan, Karan Kishor Singh, Nayely Pineda‐Aguilar, Eduardo M. Sánchez, J. A Hernández‐Magallane, and Kozhiparambil Chandran Sanal
Wiley
Mian Muhammad Faisal, Syeda Ramsha Ali, Muhammad Zahir Iqbal, Muhammad Waqas Iqbal, Arshid Numan, and K.C. Sanal
Elsevier BV
Mian Muhammad Faisal, Syeda Ramsha Ali, Sanal K.C., Muhammad Waqas Iqbal, Muhammad Zahir Iqbal, and Adeela Saeed
Elsevier BV
Abstract Supercapattery a renowned energy storage device that comprises of the features of the battery and supercapacitor at a time. This unique combination leads to the formation of such device that can deliver high energy density with no compromise on the power density. Here, we have reported a unique class of material known as metal organic frame works (MOF) for the application of energy storage devices. MOF comprises of exceptional properties such as high surface area, excellent chemical stability and high porosity. The material was synthesized via hydrothermal route in three steps. The structure, morphology, surface area, porosity and crystallinity were carried out through Tunneling Electron Microscopy, Scanning Electron Microscopy, X-ray diffraction and Brunauer-Emmett-Teller. In order to investigate the energy storage application, the electrochemical characterization was carried out in the three-electrode assembly and the material express excellent performance by showing a battery graded nature with specific capacity of 199.8 C/g. To further investigate the application in energy storage field a supercapattery was formed as a real device by coupling activated carbon as a cathode with MOF as an anode separated by porous membrane. This asymmetric assembly expresses a specific capacity of 171.15 C/g and embraces an ousting rate capability of 69% at 2.0 A/g. Furthermore, this supercapattery delivers great energy density of 38.05 W h kg-1 with an admirable power density of 1600 W kg-1. At last the supercapattery reliability was investigated through cyclic charge discharge and the device has shown exceptional stability by sustaining its capacity of 100% even after 1000 consecutive charge discharge cycles.
Syeda Ramsha Ali, Mian Muhammad Faisal, K.C. Sanal, and Muhammad Waqas Iqbal
Elsevier BV
Ifra Sardar, Muhammad Hassan Sayyad, Syeda Ramsha Ali, Mehreen Akhtar, Syed Afaq Ali Shah, and Zhongyi Guo
Springer Science and Business Media LLC
Due to the rapid increase in power conversion efficiency (PCE) of organic–inorganic perovskite solar cells (PSCs) and exceeding the PCE achieved in conventional single-junction silicon solar cells this technology has become the focus of research. The quality of perovskite film plays a vital role in developing the high performance PSCs and depends upon many factors, such as, composition of the perovskite, growth method, drying temperature, etc. In this work, hole transport material free (HTM-free) glass/FTO/c-TiO2/m-TiO2/m-ZrO2/Carbon electrode based PSCs are fabricated. Effect of prevoskite drying temperature on the photovoltaic performance and impedance spectra of these devices is studied by varying temperature from 50 to 70 °C. The photovoltaic and impedance spectra of the devices are observed to be highly dependent on the drying temperature. The best power conversion efficiency is obtained for drying temperature of 60 °C. These results show that determining the optimum drying temperature is crucial to ensure formation of perovskite crystals, highest surface coverage of perovskite, highest light harvesting and successful charge extraction from the fabricated devices in order to achieve highest performance.
Muhammad Zahir Iqbal, Mian Muhammad Faisal, and Syeda Ramsha Ali
Wiley
Muhammad Zahir Iqbal, Mian Muhammad Faisal, Muhammad Sulman, Syeda Ramsha Ali, and Meshal Alzaid
Elsevier BV
Abstract In this work, we have demonstrated, a facile synthesis of the ternary composite of strontium oxide-polyaniline-graphene (SrO-PANI-Gr) for hybrid energy storage applications. The electrochemical performance of the synthesized material is initially characterized in three electrode assembly. This nanomaterial indicates a specific capacity of 164C/g. In order to enhance the electrochemical performance of pristine SrO (S1), it is further physically blended with polyaniline in a 50/50% mass ratio which shows a specific capacity of 200C/g with lower rate capability. To further improve electrochemical performance with no compromise on rate capability, the material (S2) is further blended with graphene and this composition indicates an excellent specific capacity of 296C/g with better rate capability than the S2. To investigate the real device performance, a supercapattery device (S3//activated carbon) is fabricated which exhibits a maximum specific capacity of 151.66C/g. The assembled supercapattery device yields a maximum specific energy of 33.8 Wh.kg-1 along with maximum specific power of 3962.13 W.kg-1. Moreover, the supercapattery device demonstrated an excellent capacity retention of 80% after continuous 3000 charge discharge cycles. To further investigate the performance evaluation a theoretical model proposed by Dunn and co-workers is applied to investigate the capacitive (non-faradaic) and diffusive (faradaic) contribution in the charge storage of the supercapattery. The diffusive contribution is found dominant at lower scan rates whereas the capacitive contribution is dominant at higher scan rates. This variation in the contribution is attributed to the interaction time of the electrolyte charge with the electrode material.
Muhammad Zahir Iqbal, Mian Muhammad Faisal, Syeda Ramsha Ali, and Amir Muhammad Afzal
Elsevier BV
Abstract Supercapattery, a newly emerged energy storage device, that merges the characteristics of supercapacitor and rechargeable battery. This technology not only has the properties of fast charging-discharging and power density of supercapacitor, but also has the features of high energy storage of battery. Here, we have synthesized zinc phosphate (ZnP) through facile hydrothermal technique. The electrochemical analysis of intrinsic zinc phosphate shows low specific capacity of 41.87 C/g, and to enhance the electrochemical properties of this material, ZnP was mixed with reduced graphene oxide (rGO) powder in different mass ratios. The three electrode assembly tests for ZnP_rGO with the percentage ratio of 70:30% shows an enhancement in the specific capacity to 167.2 C/g and specific capacitance reaches up to 278.7 F/g at the current density of 0.6 A/g. Besides, this composition exhibits remarkable rate capability by sustaining 66% of its initial specific capacity even at 3.0 A/g. Furthermore, ZnP_rGO (70/30%) have been successfully applied to develop supercapattery (rGO//ZnP_rGO) device by sandwiching it with rGO. This device depicts a high energy density of 24.26 W.h/kg and outstanding power density of 2550 W/kg along with the specific capacity 102.78 C/g. In order to probe the durability, the device is faced for 2000 charge-discharge cycles, and the satisfactory results were achieved indicating 71% capacity retention after 2000 cycles. Our study reveals that ZnP_rGO with percentage weight ratio of 70/30% can be an interesting electrode material for promising supercapattery applications.
Muhammad Zahir Iqbal, Mian Muhammad Faisal, Syeda Ramsha Ali, Sidra Farid, and Amir Muhammad Afzal
Elsevier BV
Abstract The supercapattery emerges as an ultimate energy storage device that synchronizes the excellent power density and rate capability of supercapacitors with the higher energy density of batteries. Metal organic framework (MOF) signifies a novel class of porous materials designed by the strong bonds between metal ions and organic linkers. By careful selection of ingredients, MOFs can display very high surface area, excellent chemical stability, and large pore volume. Here, we report cobalt intercalated MOF/PANI composite for the application of supercapattery devices. The MOF/PANI (50/50%) has shown a highest specific capacity of 154.9 C g−1 in cyclic voltammetry at 3 mV s−1, whereas 162.5 C g−1 at 0.4 A g−1. The MOF/PANI (50/50%) gave lowest ESR resistance in electrochemical impedance spectroscopy, that reveals enhancement in the conductivity after incorporation of PANI. The supercapattery (AC//MOF/PANI) was formed by coupling the activated carbon with MOF/PANI separated by porous membrane, MOF/PANI was given the positive potential whereas the activated carbon was utilized as the negative electrode. Supercapattery showed specific capacity of 104.5 C g−1 at a current density of 1.0 A g−1. Furthermore, this hybrid device provided excellent performance by expressing the notable performance with the energy density of 23.2 W h kg−1 in line with high power density of 1600 W kg−1 at 1.0 A g−1. The highest specific power sustained by the device is 4480 W kg−1 whereas excellent stability is expressed by subjecting the device to 3000 cycles of GCD at room temperature and sustain specific capacity of 146%.
Muhammad Zahir Iqbal, Mian Muhammad Faisal, Muhammad Sulman, Syeda Ramsha Ali, Amir Muhammad Afzal, Muhammad Arshad Kamran, and Thamer Alharbi
Elsevier BV
Abstract The statistics of capacitive and diffusive contribution in the supercapattery performance is analyzed via numerical approach. In this regard's strontium phosphide has been synthesized through sonochemical technique whereas PANI is obtained through polymerization. The optimized composite of strontium phosphide and PANI is designated for supercapattery device by coupling it with activated carbon. Structural, morphological, crystallinity, and elemental analysis is carried out through SEM, XRD and EDX. The electrochemical performance in three as well as two electrode assembly is investigated through CV, GCD and EIS. Supercapattery expresses excellent performance by showing 122.4 C/g specific capacity, 28.9 W h/kg energy density and 1020 W/kg power density. This device also delivered outstanding power density of 5100 W/kg in parallel with 10.95 W h/kg energy density. Later, the capacitive/diffusive contribution in the supercapattery is analyzed through a systematic approach. A total of 87.95% diffusive contribution is recorded at the scan rate of 3 mV/s which reaches up to 57.90% at 100 mV/s. On other side capacitive contribution in the device is 12.04% at lower scan rate that raises up to 42.09% at 100 mV/s. The decrease in the diffusive part and increase in the capacitive part is due to the ion's interaction time offered with electrode material at lower and higher scan rates.
Muhammad Zahir Iqbal, Mian Muhammad Faisal, Syeda Ramsha Ali, Amir Muhammad Afzal, Muhammad Ramzan Abdul Karim, Muhammad Arshad Kamran, and Thamer Alharbi
Elsevier BV
Abstract Supercapattery, a hybrid energy storage device, gained remarkable attention due to its extraordinary energy storage performance. These devices constitute much better power and energy densities than supercapacitors and batteries. Here, we have investigated strontium phosphide and polyaniline (PANI) composites for supercapattery devices. The strontium phosphide was synthesized via facile sono-chemical method whereas the polyaniline was obtained through polymerization of aniline in acidic environment. Electrochemical performance of different mass ratios of strontium phosphide and polyaniline that are 75/25% and 50/50% were tested in three electrode assembly. Electrochemical characterization including galvanostatic charge discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were performed to probe the electroactive nature of the composites. The initial characterization predicts the battery grade nature of synthesized composites which were confirmed through theoretical approach. The sample S3 indicates highest specific capacity of 192 Cg-1 in CV at a scan rate of 10 mV/s and 196 C/g in GCD at a current density of 0.4 A/g. In light of electrochemical performance, the 50/50% composite electrode was further investigated for supercapattery by sandwiching it with activated carbon electrode (capacitive electrode). The supercapattery (AC//S3) operates reliably at 0–1.7 V wider potential window in 1 M KOH environment and showing excellent specific capacity of 122.5 C/g at 0.6 A/g while demonstrating better rate capability of 37% at 3.0 A/g. Besides, this device expresses an outstanding performance in terms of energy and power density, 28.9 Wh/kg of maximum specific energy is achieved in line with 1020 W/kg of power density at 0.4 A/g. This device reveals an excellent power density of 5100 W/kg at the cost of 10.95 Wh/kg energy density. In last the device durability was examined by subjecting it to 2000 consecutive charge discharge cycles. Strontium phosphide/PANI composites would be novel electrode materials for state of the art supercapattery devices.
Muhammad Zahir Iqbal, Mian Muhammad Faisal, Amir Muhammad Afzal, Syed Shabhi Haider, Syeda Ramsha Ali, Muhammad Arshad Kamran, Thamer Alharbi, and Tassadaq Hussain
Elsevier BV
Abstract Two dimensional (2D) layered materials such as graphene and transition metal dichalcogenides (TMDCs) have gain profound attention owing to their unique electrical, optical, structural and mechanical properties. These novel features make them promising candidate for the next generation optoelectronic and photonic devices. Here, we demonstrated the gate-voltage dependent current modulation of vertical Au/WS2/Gr Schottky barrier. A clear rectification is observed in J-V characteristic curves at different gate-voltage due to asymmetric barriers Au/WS2 and WS2/Gr. The current modulation is obtained by varying the gate-voltage and the extracted rectification ratios ranging from 2.25 × 103 at −60 V to 1.65 × 103 at +60 V, respectively. Furthermore, the junction is utilized for the photo response at several drain to source and gate voltages which reveals modulation in the photocurrent. The photocurrent detected at Vds 0.5 V is ~24 μA that is enhanced to ~52 μA upon varying the Vds to 1 V. Gate tunable photoresponse of the junction depicts that the photocurrent is enhanced from 16 μA at Vg 20 V to ~17 μA at Vg 60 V. Our results demonstrate an effective way to modulate the current of Schottky junction (Au/WS2/Gr) by employing gate voltage whereas the tunability in the photocurrent unveil its potential applications in next generation photodetectors.
Waqas Pervez and Syeda Ramsha Ali
Springer Science and Business Media LLC
Solar energy is an abundantly available form of clean and renewable energy resource that can be used to generate electricity using many different photovoltaic technologies. Dye-sensitized solar cells (DSSCs) have attracted attention of researchers due to their low cost and easy fabrication processes, when compared to conventional silicon-based photovoltaic devices. Performance enhancement of DSSCs continues to be the subject of recent research. In this work, FTO/TiO 2 /N719/electrolyte/Pt-type conventional DSSCs were fabricated with and without heat treatment of the FTO/TiO 2 photoanode before sensitization and Pt counter electrode. Results of the photovoltaic and impedance spectroscopic measurements are reported and discussed. The photovoltaic data reveals relatively higher performance of the cell made after heat treatments of the photoanode and the counter electrodes. The objective of this research is to study the reason for high performance obtained employing the annealed photoanode. The overall power conversion efficiency and short-circuit current density of the device made after heat treatment are observed higher than the one without heat treatment by 165% and 206%, respectively. The impedance spectroscopic studies also confirmed high performance of the cell made after the heat treatments.
Muhammad Zahir Iqbal, Syeda Ramsha Ali, and Sana Khan
Elsevier BV
Abstract Dye sensitized solar cells (DSSCs) have been emerged as one of the promising technological developments in the field of renewable energy. The dye, as sensitizer plays an imperative role in evaluating the performance of DSSC. The use of metal-free natural dyes turns out to be convenient substitute for rare and expensive Ru-based dyes due to facile preparation, feasible extraction processes, cost-effectiveness and environmental friendliness. Leaves, flowers petals, barks and roots containing chlorophyll, carotenoid, betalains, anthocyanin and flavonoid pigments are the sources of natural dye extraction. This work explores the novel aspects of progress in the performance of DSSC by incorporating natural dyes as photosensitizer. Furthermore, the study presents the comprehensive overview on the application of natural sources that can be employed as sensitizing agents in DSSC rendering higher efficiencies and better stabilities.