The Experts below are selected from a list of 1638 Experts worldwide ranked by ideXlab platform
Govind Gupta - One of the best experts on this subject based on the ideXlab platform.
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in situ integration of waste coconut shell derived activated carbon polypyrrole rare earth metal oxide eu2o3 a novel step towards ultrahigh volumetric Capacitance
2017Co-Authors: Anukul K Thakur, Ram Bilash Choudhary, Mandira Majumder, Govind GuptaAbstract:Abstract A facile approach to synthesize a hybrid polymeric composite with ultra-high volumetric Capacitance by incorporating waste coconut shell derived activated carbon (AC) and rare-earth metal oxide (Eu2O3) into the polypyrrole (PPY) matrix has been reported in this work. The composite is synthesized via in situ oxidative polymerization. The PPY/AC/Eu2O3 composite stores energy both Faradaically and electrostatically. Further, the electrochemical performance gets augmented with the incorporation of rare earth metal oxide Eu2O3 owing to the availability of multiple valence states and development of stronger interaction with PPY which a good electron donor in turn leading to easy protonation of PPY. The as-prepared composites exhibit a highest Gravimetric Capacitance 670 F g−1 and an outstanding volumetric Capacitance 1090 F cm−3 at the current density of 1 A g−1. Also, the composite with the maximum volumetric Capacitance exhibits a high-power density of 4108 W L−1 with the maximum energy density of 37.85 Wh L−1 at the current density of 1 A g−1.
Anukul K Thakur - One of the best experts on this subject based on the ideXlab platform.
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in situ integration of waste coconut shell derived activated carbon polypyrrole rare earth metal oxide eu2o3 a novel step towards ultrahigh volumetric Capacitance
2017Co-Authors: Anukul K Thakur, Ram Bilash Choudhary, Mandira Majumder, Govind GuptaAbstract:Abstract A facile approach to synthesize a hybrid polymeric composite with ultra-high volumetric Capacitance by incorporating waste coconut shell derived activated carbon (AC) and rare-earth metal oxide (Eu2O3) into the polypyrrole (PPY) matrix has been reported in this work. The composite is synthesized via in situ oxidative polymerization. The PPY/AC/Eu2O3 composite stores energy both Faradaically and electrostatically. Further, the electrochemical performance gets augmented with the incorporation of rare earth metal oxide Eu2O3 owing to the availability of multiple valence states and development of stronger interaction with PPY which a good electron donor in turn leading to easy protonation of PPY. The as-prepared composites exhibit a highest Gravimetric Capacitance 670 F g−1 and an outstanding volumetric Capacitance 1090 F cm−3 at the current density of 1 A g−1. Also, the composite with the maximum volumetric Capacitance exhibits a high-power density of 4108 W L−1 with the maximum energy density of 37.85 Wh L−1 at the current density of 1 A g−1.
Liang Zi-chang - One of the best experts on this subject based on the ideXlab platform.
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an ideal electrode material 3d surface microporous graphene for supercapacitors with ultrahigh areal Capacitance
2017Co-Authors: Liang Zi-chang, Dario StacchiolaAbstract:The efficient charge accumulation of an ideal supercapacitor electrode requires abundant micropores and its fast electrolyte-ions transport prefers meso/macropores. However, current electrode materials cannot meet both requirements, resulting in poor performance. Herein, we creatively constructed three-dimensional cabbage-coral-like graphene as an ideal electrode material, in which meso/macro channels are formed by graphene walls and rich micropores are incorporated in the surface layer of the graphene walls. The unique 3D graphene material can achieve a high Gravimetric Capacitance of 200 F/g with aqueous electrolyte, 3 times larger than that of commercially used activated carbon (70.8 F/g). Furthermore, it can reach an ultrahigh areal Capacitance of 1.28 F/cm2 and excellent rate capability (83.5% from 0.5 to 10 A/g) as well as high cycling stability (86.2% retention after 5000 cycles). The excellent electric double-layer performance of the 3D graphene electrode can be attributed to the fast electrolyte ...
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excellent performance of highly conductive porous na embedded carbon nanowalls for electric double layer capacitors with a wide operating temperature range
2017Co-Authors: Liang Zi-chang, Yun Hang HuAbstract:Porous Na-embedded carbon (Na@C), which was recently invented, possesses both very high electrical conductivity and a large accessible surface area. These unique properties can meet strict requirements for ideal electrode materials. Herein, it was revealed that symmetric electric double-layer capacitors (EDLCs) with Na@C electrodes exhibited an ultrahigh areal Capacitance up to 1.14 F cm−2 at a large current density up to 10 A g−1. Furthermore, a critical issue that the enhancement of mass loading usually sacrifices the Gravimetric Capacitance was solved with Na@C electrodes, namely, when the mass loading of the Na@C electrode was increased from 4 to 8 mg cm−2, a negligible Gravimetric Capacitance drop (only 0.2 F g−1) occurred at 1 A g−1. The excellent performance remained almost unchanged with increasing temperature from −10 to 55 °C. In addition, the novel electrode exhibited excellent stability with almost 100% Capacitance retention at 5 A g−1 after 4000 galvanostatic charge/discharge cycles. Na@C would be a very promising electrode material for commercial electric double-layer capacitors.
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An Ideal Electrode Material, 3D Surface-Microporous Graphene for Supercapacitors with Ultrahigh Areal Capacitance
2017Co-Authors: Liang Zi-chang, Dario StacchiolaAbstract:The efficient charge accumulation of an ideal supercapacitor electrode requires abundant micropores and its fast electrolyte-ions transport prefers meso/macropores. However, current electrode materials cannot meet both requirements, resulting in poor performance. Herein, we creatively constructed three-dimensional cabbage-coral-like graphene as an ideal electrode material, in which meso/macro channels are formed by graphene walls and rich micropores are incorporated in the surface layer of the graphene walls. The unique 3D graphene material can achieve a high Gravimetric Capacitance of 200 F/g with aqueous electrolyte, 3 times larger than that of commercially used activated carbon (70.8 F/g). Furthermore, it can reach an ultrahigh areal Capacitance of 1.28 F/cm2 and excellent rate capability (83.5% from 0.5 to 10 A/g) as well as high cycling stability (86.2% retention after 5000 cycles). The excellent electric double-layer performance of the 3D graphene electrode can be attributed to the fast electrolyte ion transport in the meso/macro channels and the rapid and reversible charge adsorption with negligible transport distance in the surface micropores
Dario Stacchiola - One of the best experts on this subject based on the ideXlab platform.
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an ideal electrode material 3d surface microporous graphene for supercapacitors with ultrahigh areal Capacitance
2017Co-Authors: Liang Zi-chang, Dario StacchiolaAbstract:The efficient charge accumulation of an ideal supercapacitor electrode requires abundant micropores and its fast electrolyte-ions transport prefers meso/macropores. However, current electrode materials cannot meet both requirements, resulting in poor performance. Herein, we creatively constructed three-dimensional cabbage-coral-like graphene as an ideal electrode material, in which meso/macro channels are formed by graphene walls and rich micropores are incorporated in the surface layer of the graphene walls. The unique 3D graphene material can achieve a high Gravimetric Capacitance of 200 F/g with aqueous electrolyte, 3 times larger than that of commercially used activated carbon (70.8 F/g). Furthermore, it can reach an ultrahigh areal Capacitance of 1.28 F/cm2 and excellent rate capability (83.5% from 0.5 to 10 A/g) as well as high cycling stability (86.2% retention after 5000 cycles). The excellent electric double-layer performance of the 3D graphene electrode can be attributed to the fast electrolyte ...
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An Ideal Electrode Material, 3D Surface-Microporous Graphene for Supercapacitors with Ultrahigh Areal Capacitance
2017Co-Authors: Liang Zi-chang, Dario StacchiolaAbstract:The efficient charge accumulation of an ideal supercapacitor electrode requires abundant micropores and its fast electrolyte-ions transport prefers meso/macropores. However, current electrode materials cannot meet both requirements, resulting in poor performance. Herein, we creatively constructed three-dimensional cabbage-coral-like graphene as an ideal electrode material, in which meso/macro channels are formed by graphene walls and rich micropores are incorporated in the surface layer of the graphene walls. The unique 3D graphene material can achieve a high Gravimetric Capacitance of 200 F/g with aqueous electrolyte, 3 times larger than that of commercially used activated carbon (70.8 F/g). Furthermore, it can reach an ultrahigh areal Capacitance of 1.28 F/cm2 and excellent rate capability (83.5% from 0.5 to 10 A/g) as well as high cycling stability (86.2% retention after 5000 cycles). The excellent electric double-layer performance of the 3D graphene electrode can be attributed to the fast electrolyte ion transport in the meso/macro channels and the rapid and reversible charge adsorption with negligible transport distance in the surface micropores
Ram Bilash Choudhary - One of the best experts on this subject based on the ideXlab platform.
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in situ integration of waste coconut shell derived activated carbon polypyrrole rare earth metal oxide eu2o3 a novel step towards ultrahigh volumetric Capacitance
2017Co-Authors: Anukul K Thakur, Ram Bilash Choudhary, Mandira Majumder, Govind GuptaAbstract:Abstract A facile approach to synthesize a hybrid polymeric composite with ultra-high volumetric Capacitance by incorporating waste coconut shell derived activated carbon (AC) and rare-earth metal oxide (Eu2O3) into the polypyrrole (PPY) matrix has been reported in this work. The composite is synthesized via in situ oxidative polymerization. The PPY/AC/Eu2O3 composite stores energy both Faradaically and electrostatically. Further, the electrochemical performance gets augmented with the incorporation of rare earth metal oxide Eu2O3 owing to the availability of multiple valence states and development of stronger interaction with PPY which a good electron donor in turn leading to easy protonation of PPY. The as-prepared composites exhibit a highest Gravimetric Capacitance 670 F g−1 and an outstanding volumetric Capacitance 1090 F cm−3 at the current density of 1 A g−1. Also, the composite with the maximum volumetric Capacitance exhibits a high-power density of 4108 W L−1 with the maximum energy density of 37.85 Wh L−1 at the current density of 1 A g−1.
