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Papers by bela purty

Journal of Energy Storage, 2020

One of the basic intentions of science and technology is the evolution of novel and more efficien... more One of the basic intentions of science and technology is the evolution of novel and more efficient devices to make human life more easy and comfortable. A supercapacitor is one such device that can be utilized as a complementary and to some extent a replacement of electrochemical battery to store electrical energy. The performance of a supercapacitor very much depends on the electrode material used and hence a variety of materials are employed to form electrodes of supercapacitors in order to improve its performance. In this review, we have discussed the preparation and properties of polypyrrole (PPy) and polyindole (PIn) based electrode material for supercapacitor applications. PPy shows a high degree of flexibility which makes it markedly suitable and applicable for making flexible supercapacitors. PIn exhibit slow hydrolytic degradation and hence long chargedischarge time. Thus, PIn can be utilized to form supercapacitors having the ability to store energy for a longer period of time. Nonetheless, their properties can be enhanced by using binary and ternary composites of PPy and PIn with different carbon-based and metal-based materials. This review briefly discusses some of these composites and devices formed by them.

Journal of Solid State Chemistry, 2019

The industry of smart energy storage system demands high energy density electrode material for su... more The industry of smart energy storage system demands high energy density electrode material for supercapacitors. In this work, ZnS/rGO/PIn (ZGPIn) nanohybrid was synthesized to enhance energy density by varying potential window range. A binder free ZGPIn electrode has slit like pores, better redox activity, thermal stability and long life span which favours as sustainable electrode material for green energy applications. The structural, thermal and morphological properties were studied via FTIR, XRD, Raman, TGA and FESEM techniques. The electrochemical properties were studied in 1 M H 2 SO 4 at room temperature. The as prepared ZGPIn electrode material delivered highest gravimetric and volumetric capacitances of 475.5 F g À1 and 165 F cm À3 with gravimetric and volumetric energy densities of 42.3 W h kg À1 and 14.7 W h L À1 at 1 A g À1 respectively. The energy density reaches to 74.7 W h kg À1 for 1.4 V at 1 A g À1. The 95% capacitance retention after 5000 consecutive cycles reveals its long term cyclic stability and suggested as an efficient, cheap and reliable electrode material for supercapacitor application.

Optik, 2018

The present work reports for the optical, dielectric and electrochemical properties of Fedoped Mn... more The present work reports for the optical, dielectric and electrochemical properties of Fedoped MnO2/PIn nanocomposite. Fe-doped MnO2/PIn nanocomposite was synthesized via a facile in-situ chemical oxidative polymerization process. The porous nanostructure of PIn was examined from FESEM images and proved to be a promising candidate for numerous applications. The chemical bonds were confirmed through FTIR analysis. Eminence surface morphology and structural features were examined via TEM technique with corresponding SAED pattern. The optical property was investigated through UV-vis spectroscopic technique and modified electronic band structure was corroborated via tauc plot and band gap energy. The high dielectric constant, dielectric loss and AC conductivity revealed that Fe:MnO2/PIn nanocomposite was a superb dielectric material with excellent redox property. The optimized optical and dielectric property of Fe:MnO2/PIn nanocomposite proved it as an effective candidate for solar cells, capacitors, electronic packaging and many others electronic devices.

Materials Chemistry and Physics, 2018

Cadmium sulfide/polypyrrole decorated reduced graphene oxide (rGO/CdS/PPY) nanosheets were synthe... more Cadmium sulfide/polypyrrole decorated reduced graphene oxide (rGO/CdS/PPY) nanosheets were synthesized via chemical oxidative in-situ polymerization process. The impact of CdS nanoparticle on rGO incorporated polymeric matrix (PPY) was investigated. The as prepared nanosheets were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible spectroscopy (UV-vis), field emission scanning electron microscope (FESEM) and energy dispersive x-ray (EDX) techniques. Their thermal stability was examined by thermogravimetric analysis (TGA). The electrochemical measurements were performed using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), cyclic stability and electrochemical impedance spectroscopic (EIS) techniques. The nanocomposite containing 10 wt % CdS (GCP10) showed an enhanced specific capacitance ~844 F g-1 at current density ~1 A g-1. This nanocomposite displayed low equivalent series resistance (ESR), of 2.8 Ω and good cyclic stability with capacitance

Synthetic Metals, 2019

It is well known that high performance supercapacitor with high energy and power density is usual... more It is well known that high performance supercapacitor with high energy and power density is usually degrade at high temperatures. Therefore, to explore the thermal stability, temperature dependent study of supercapacitor is very useful. In the present work, La 2 O 3 nanosheet decorated reduce graphene oxide is synthesized to use it as electrode material in high performance supercapacitor. Temperature dependent electrochemical behavior viz. charging discharging and current voltage (I-V) characteristics are studied to explore the thermal stability of the system. In comparison to pristine rGO, the specific capacitance of La 2 O 3 decorated sample is found to increase by 158% at temperatures 30 o C and 205% at 70 o C respectively. The highest value obtained is 751 F/g at temperature 70 o C at a current density of 1 A/g. Remarkably the specific capacitance of hybrid electrode retains 78% of its original value at temperature 30 o C; conversely 67% of its original value even at higher temperature 70 o C after 2000 cycles. The enhancement of specific capacitance is explained by the charge transfer effect between rGO and La 2 O 3 at the interface. 14]. After discovery of graphene According to the charge storage mechanism, supercapacitor can be classified as electrical double layer capacitors (EDLC) using porous carbon materials, pseudocapacitors using chemically electroactive material [15, 16] and hybrid supercapacitor using anode and cathode materials [17-21]. Extensive research has been devoted to develop high performance electrode materials for pseudocapacitor, using graphene based metal oxide and transition metal oxide, Ultrafine graphite powder is taken from Sigma-Aldrich. Hydrogen peroxide (30%), methanol (99%), sulphuric acid (98 wt %), potassium carbonate, potassium permanganate and sodium nitrite were purchased from Merck Chemicals. Lanthanum acetate and cobalt acetate salts were obtained from Sigma Aldrich. Also the solvents like oleylamine and octadecene were taken from

Polymer Bulletin, 2018

Hydrothermally synthesized α-MnO2 nanorods-decorated functionalized carbon nanotube wrapped with ... more Hydrothermally synthesized α-MnO2 nanorods-decorated functionalized carbon nanotube wrapped with polyindole was fabricated as an electrode material via chemical oxidative in situ polymerization process. Droplet-like nanostructures with small holes of polyindole and dimple fracture, followed by microvoids in the ternary blend f-CNT/α-MnO2/polyindole (CMP), revealed mesoporous nanostructure which provided suitable path for ion transfer into the interface of the electrode material resulting in excellent conductivity. The electrochemical features of CMP were studied by employing cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopic (EIS) techniques. The novel electrode material CMP delivered high gravimetric capacitance of 421 F g−1 at current density 2 A g−1 in three electrode systems with 1 M KCl as an electrolyte. With mass loading 0.15 mg cm−2, the areal capacitance for CMP nanocomposite was calculated 63 mF cm−2. The long lifespan with 92.1%...

Journal of Energy Storage, 2020

One of the basic intentions of science and technology is the evolution of novel and more efficien... more One of the basic intentions of science and technology is the evolution of novel and more efficient devices to make human life more easy and comfortable. A supercapacitor is one such device that can be utilized as a complementary and to some extent a replacement of electrochemical battery to store electrical energy. The performance of a supercapacitor very much depends on the electrode material used and hence a variety of materials are employed to form electrodes of supercapacitors in order to improve its performance. In this review, we have discussed the preparation and properties of polypyrrole (PPy) and polyindole (PIn) based electrode material for supercapacitor applications. PPy shows a high degree of flexibility which makes it markedly suitable and applicable for making flexible supercapacitors. PIn exhibit slow hydrolytic degradation and hence long chargedischarge time. Thus, PIn can be utilized to form supercapacitors having the ability to store energy for a longer period of time. Nonetheless, their properties can be enhanced by using binary and ternary composites of PPy and PIn with different carbon-based and metal-based materials. This review briefly discusses some of these composites and devices formed by them.

Journal of Solid State Chemistry, 2019

The industry of smart energy storage system demands high energy density electrode material for su... more The industry of smart energy storage system demands high energy density electrode material for supercapacitors. In this work, ZnS/rGO/PIn (ZGPIn) nanohybrid was synthesized to enhance energy density by varying potential window range. A binder free ZGPIn electrode has slit like pores, better redox activity, thermal stability and long life span which favours as sustainable electrode material for green energy applications. The structural, thermal and morphological properties were studied via FTIR, XRD, Raman, TGA and FESEM techniques. The electrochemical properties were studied in 1 M H 2 SO 4 at room temperature. The as prepared ZGPIn electrode material delivered highest gravimetric and volumetric capacitances of 475.5 F g À1 and 165 F cm À3 with gravimetric and volumetric energy densities of 42.3 W h kg À1 and 14.7 W h L À1 at 1 A g À1 respectively. The energy density reaches to 74.7 W h kg À1 for 1.4 V at 1 A g À1. The 95% capacitance retention after 5000 consecutive cycles reveals its long term cyclic stability and suggested as an efficient, cheap and reliable electrode material for supercapacitor application.

Optik, 2018

The present work reports for the optical, dielectric and electrochemical properties of Fedoped Mn... more The present work reports for the optical, dielectric and electrochemical properties of Fedoped MnO2/PIn nanocomposite. Fe-doped MnO2/PIn nanocomposite was synthesized via a facile in-situ chemical oxidative polymerization process. The porous nanostructure of PIn was examined from FESEM images and proved to be a promising candidate for numerous applications. The chemical bonds were confirmed through FTIR analysis. Eminence surface morphology and structural features were examined via TEM technique with corresponding SAED pattern. The optical property was investigated through UV-vis spectroscopic technique and modified electronic band structure was corroborated via tauc plot and band gap energy. The high dielectric constant, dielectric loss and AC conductivity revealed that Fe:MnO2/PIn nanocomposite was a superb dielectric material with excellent redox property. The optimized optical and dielectric property of Fe:MnO2/PIn nanocomposite proved it as an effective candidate for solar cells, capacitors, electronic packaging and many others electronic devices.

Materials Chemistry and Physics, 2018

Cadmium sulfide/polypyrrole decorated reduced graphene oxide (rGO/CdS/PPY) nanosheets were synthe... more Cadmium sulfide/polypyrrole decorated reduced graphene oxide (rGO/CdS/PPY) nanosheets were synthesized via chemical oxidative in-situ polymerization process. The impact of CdS nanoparticle on rGO incorporated polymeric matrix (PPY) was investigated. The as prepared nanosheets were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible spectroscopy (UV-vis), field emission scanning electron microscope (FESEM) and energy dispersive x-ray (EDX) techniques. Their thermal stability was examined by thermogravimetric analysis (TGA). The electrochemical measurements were performed using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), cyclic stability and electrochemical impedance spectroscopic (EIS) techniques. The nanocomposite containing 10 wt % CdS (GCP10) showed an enhanced specific capacitance ~844 F g-1 at current density ~1 A g-1. This nanocomposite displayed low equivalent series resistance (ESR), of 2.8 Ω and good cyclic stability with capacitance

Synthetic Metals, 2019

It is well known that high performance supercapacitor with high energy and power density is usual... more It is well known that high performance supercapacitor with high energy and power density is usually degrade at high temperatures. Therefore, to explore the thermal stability, temperature dependent study of supercapacitor is very useful. In the present work, La 2 O 3 nanosheet decorated reduce graphene oxide is synthesized to use it as electrode material in high performance supercapacitor. Temperature dependent electrochemical behavior viz. charging discharging and current voltage (I-V) characteristics are studied to explore the thermal stability of the system. In comparison to pristine rGO, the specific capacitance of La 2 O 3 decorated sample is found to increase by 158% at temperatures 30 o C and 205% at 70 o C respectively. The highest value obtained is 751 F/g at temperature 70 o C at a current density of 1 A/g. Remarkably the specific capacitance of hybrid electrode retains 78% of its original value at temperature 30 o C; conversely 67% of its original value even at higher temperature 70 o C after 2000 cycles. The enhancement of specific capacitance is explained by the charge transfer effect between rGO and La 2 O 3 at the interface. 14]. After discovery of graphene According to the charge storage mechanism, supercapacitor can be classified as electrical double layer capacitors (EDLC) using porous carbon materials, pseudocapacitors using chemically electroactive material [15, 16] and hybrid supercapacitor using anode and cathode materials [17-21]. Extensive research has been devoted to develop high performance electrode materials for pseudocapacitor, using graphene based metal oxide and transition metal oxide, Ultrafine graphite powder is taken from Sigma-Aldrich. Hydrogen peroxide (30%), methanol (99%), sulphuric acid (98 wt %), potassium carbonate, potassium permanganate and sodium nitrite were purchased from Merck Chemicals. Lanthanum acetate and cobalt acetate salts were obtained from Sigma Aldrich. Also the solvents like oleylamine and octadecene were taken from

Polymer Bulletin, 2018

Hydrothermally synthesized α-MnO2 nanorods-decorated functionalized carbon nanotube wrapped with ... more Hydrothermally synthesized α-MnO2 nanorods-decorated functionalized carbon nanotube wrapped with polyindole was fabricated as an electrode material via chemical oxidative in situ polymerization process. Droplet-like nanostructures with small holes of polyindole and dimple fracture, followed by microvoids in the ternary blend f-CNT/α-MnO2/polyindole (CMP), revealed mesoporous nanostructure which provided suitable path for ion transfer into the interface of the electrode material resulting in excellent conductivity. The electrochemical features of CMP were studied by employing cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopic (EIS) techniques. The novel electrode material CMP delivered high gravimetric capacitance of 421 F g−1 at current density 2 A g−1 in three electrode systems with 1 M KCl as an electrolyte. With mass loading 0.15 mg cm−2, the areal capacitance for CMP nanocomposite was calculated 63 mF cm−2. The long lifespan with 92.1%...