We report the synthesis and structural characterization of a bimetallic zinc selenolate complex c... more We report the synthesis and structural characterization of a bimetallic zinc selenolate complex consisting of a redox silent zinc metal ion and a trifunctional ligand that electrocatalyzes the reduction of protons into hydrogen gas.
Role of temperature has been investigated for multifarious nanoporous carbon having physisorbed h... more Role of temperature has been investigated for multifarious nanoporous carbon having physisorbed hydroquinone.
We have explored Co3O4 based nanomaterials for the oxygen evolution reaction prepared via a surfa... more We have explored Co3O4 based nanomaterials for the oxygen evolution reaction prepared via a surfactant directed soft-templating strategy.
Correction for ‘Selective synthesis of single layer translucent cobalt hydroxide for the efficien... more Correction for ‘Selective synthesis of single layer translucent cobalt hydroxide for the efficient oxygen evolution reaction’ by Priyajit Jash et al., Chem. Commun., 2019, 55, 2230–2233.
Remarkable water oxidation reactivity exhibited by a translucent single layer Co(OH)2 nanosheet s... more Remarkable water oxidation reactivity exhibited by a translucent single layer Co(OH)2 nanosheet synthesized from α-Co(OH)2 by liquid phase exfoliation.
Chemical communications (Cambridge, England), Jan 16, 2018
A novel class of pyrene-based conjugated porous organic polymers having an N-containing network w... more A novel class of pyrene-based conjugated porous organic polymers having an N-containing network was developed by employing Buchwald-Hartwig coupling for supercapacitor energy storage. The pristine polymer was found to exhibit a specific capacitance of 456 F g-1 at 0.5 A g-1 current density with excellent long-term cyclic stability.
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 30, 2017
We report a simple approach for the synthesis of cobalt phosphonate (CoOP) nanocages with two dis... more We report a simple approach for the synthesis of cobalt phosphonate (CoOP) nanocages with two distinct types of pore diameters by utilizing a novel tetra-constituent assembly of CoCl2 ⋅6 H2 O, nitrilotris(methylene)triphosphonic acid (NMPA), F127 surfactant, and polyvinyl alcohol (PVA, co-surfactant). Transmission electron microscopy images revealed the formation of large nanocages in spheres (pore diameter: 20-60 nm) and the existence of narrow micro/mesopores (pore diameter: 1.5-5 nm) on their walls. Brunauer-Emmett-Teller adsorption/desorption experiments led to the observation of dual porosity and indicated that the contribution of micro/mesopores increased gradually with increasing concentration of PVA during synthesis from CoOP-0 to CoOP-15 (where the number gives the wt % of PVA used in CoOP synthesis). These materials acted as precatalysts for heterogeneous water oxidation at pH 13.9 (1 m KOH) and electrochemical studies revealed that the reactivity improved remarkably with ...
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 19, 2017
Manganese dioxide nanomaterials with "Koosh-ball" like morphology (MnO2-KBs) as well as... more Manganese dioxide nanomaterials with "Koosh-ball" like morphology (MnO2-KBs) as well as worm-like nanotubes (MnO2-NWs) were obtained by employing Tween 20 as the reducing-cum-structure-directing agent, and KMnO4 as a MnO2 precursor. While the MnO2-KBs were interconnected with each other through tubular extensions, MnO2-NWs were largely disconnected. Both MnO2-KBs and MnO2-NWs had large BET surface areas (>200 m2/g), and were thermally robust upto 300 ⁰C. The electrochemical studies revealed that the highest specific capacitance (Csp) obtained for MnO2-KBs was significantly higher (272 F/g) than that of MnO2-NWs (129 F/g). The Csp values correlated amicably with the electroactive surface areas of the material - MnO2-KBs had significantly higher electrolyte-accessible surface area. Electrochemical impedance spectroscopy (EIS) revealed higher electron transfer rate at the electrode/electrolyte interface for MnO2-KBs than that of MnO2-NWs. The multiple tubular interconnecti...
The first demonstration of solid state proton conduction (8.7 × 10−3 S cm−1 at 80 °C, 95% relativ... more The first demonstration of solid state proton conduction (8.7 × 10−3 S cm−1 at 80 °C, 95% relative humidity) of oxygen functionalized few-layer graphene.
Iron oxyhydroxide thin films electrochemically deposited from a non-aqueous medium using metal in... more Iron oxyhydroxide thin films electrochemically deposited from a non-aqueous medium using metal inorganic complexes as a metal ion precursor have been demonstrated as an efficient electrochemical water oxidation catalyst under near neutral as well as alkaline pH conditions.
An economical and simple low temperature chemically assisted reduced graphene synthesis has been ... more An economical and simple low temperature chemically assisted reduced graphene synthesis has been reported and the obtained graphene exhibits very high electrical conductivity (1.6 × 103 S cm−1).
A proof of concept to enhance the specific capacitance and energy density of a supercapacitor has... more A proof of concept to enhance the specific capacitance and energy density of a supercapacitor has been demonstrated wherein reversible 1e- transfer redox chemistry of cations of ionic liquids ([EMIM][EtSO4] and [MIM][HSO4]) which acted as both solvent and electrolyte has been utilized. Outstanding specific capacitance and energy densities in the range of 420-710 F/g and 580-920 Wh/kg, respectively, have been obtained for carbon-based nanomaterials.
The first report of oxygen functionalized few-layer graphene (OFG)
having an interlayer distance ... more The first report of oxygen functionalized few-layer graphene (OFG) having an interlayer distance of 3.6 Å as an excellent proton conductor (8.7 103 S cm1 at 80 8C, 95% RH) utilizing hydrophilic oxygen functionalities present at sheet edges bypassing the theoretical limitation of proton conduction through a basal plane. The synthesized OFG also exhibited excellent supercapacitor performance (296 F g1).
The effect of molecular chirality on electron transmission is explored by photoelectrochemistry. ... more The effect of molecular chirality on electron transmission is explored by photoelectrochemistry. Thiol-terminated chiral scaffold molecules containing a porphyrin chromophore were self-assembled on gold surfaces to form a monolayer. Incorporation of the SAM-coated gold into an electrochemical cell and illumination with visible light generated a cathodic photocurrent. When using circularly polarized light, the photocurrent displayed an asymmetry (different magnitude of photocurrent for right versus left polarization) that changed with the molecular chirality (left- or right-handedness of the scaffold). A symmetry constraint on the electronic coupling between the porphyrin and the organic scaffold is proposed as a possible mechanism for the photocurrent asymmetry.
We report the synthesis and structural characterization of a bimetallic zinc selenolate complex c... more We report the synthesis and structural characterization of a bimetallic zinc selenolate complex consisting of a redox silent zinc metal ion and a trifunctional ligand that electrocatalyzes the reduction of protons into hydrogen gas.
Role of temperature has been investigated for multifarious nanoporous carbon having physisorbed h... more Role of temperature has been investigated for multifarious nanoporous carbon having physisorbed hydroquinone.
We have explored Co3O4 based nanomaterials for the oxygen evolution reaction prepared via a surfa... more We have explored Co3O4 based nanomaterials for the oxygen evolution reaction prepared via a surfactant directed soft-templating strategy.
Correction for ‘Selective synthesis of single layer translucent cobalt hydroxide for the efficien... more Correction for ‘Selective synthesis of single layer translucent cobalt hydroxide for the efficient oxygen evolution reaction’ by Priyajit Jash et al., Chem. Commun., 2019, 55, 2230–2233.
Remarkable water oxidation reactivity exhibited by a translucent single layer Co(OH)2 nanosheet s... more Remarkable water oxidation reactivity exhibited by a translucent single layer Co(OH)2 nanosheet synthesized from α-Co(OH)2 by liquid phase exfoliation.
Chemical communications (Cambridge, England), Jan 16, 2018
A novel class of pyrene-based conjugated porous organic polymers having an N-containing network w... more A novel class of pyrene-based conjugated porous organic polymers having an N-containing network was developed by employing Buchwald-Hartwig coupling for supercapacitor energy storage. The pristine polymer was found to exhibit a specific capacitance of 456 F g-1 at 0.5 A g-1 current density with excellent long-term cyclic stability.
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 30, 2017
We report a simple approach for the synthesis of cobalt phosphonate (CoOP) nanocages with two dis... more We report a simple approach for the synthesis of cobalt phosphonate (CoOP) nanocages with two distinct types of pore diameters by utilizing a novel tetra-constituent assembly of CoCl2 ⋅6 H2 O, nitrilotris(methylene)triphosphonic acid (NMPA), F127 surfactant, and polyvinyl alcohol (PVA, co-surfactant). Transmission electron microscopy images revealed the formation of large nanocages in spheres (pore diameter: 20-60 nm) and the existence of narrow micro/mesopores (pore diameter: 1.5-5 nm) on their walls. Brunauer-Emmett-Teller adsorption/desorption experiments led to the observation of dual porosity and indicated that the contribution of micro/mesopores increased gradually with increasing concentration of PVA during synthesis from CoOP-0 to CoOP-15 (where the number gives the wt % of PVA used in CoOP synthesis). These materials acted as precatalysts for heterogeneous water oxidation at pH 13.9 (1 m KOH) and electrochemical studies revealed that the reactivity improved remarkably with ...
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 19, 2017
Manganese dioxide nanomaterials with "Koosh-ball" like morphology (MnO2-KBs) as well as... more Manganese dioxide nanomaterials with "Koosh-ball" like morphology (MnO2-KBs) as well as worm-like nanotubes (MnO2-NWs) were obtained by employing Tween 20 as the reducing-cum-structure-directing agent, and KMnO4 as a MnO2 precursor. While the MnO2-KBs were interconnected with each other through tubular extensions, MnO2-NWs were largely disconnected. Both MnO2-KBs and MnO2-NWs had large BET surface areas (>200 m2/g), and were thermally robust upto 300 ⁰C. The electrochemical studies revealed that the highest specific capacitance (Csp) obtained for MnO2-KBs was significantly higher (272 F/g) than that of MnO2-NWs (129 F/g). The Csp values correlated amicably with the electroactive surface areas of the material - MnO2-KBs had significantly higher electrolyte-accessible surface area. Electrochemical impedance spectroscopy (EIS) revealed higher electron transfer rate at the electrode/electrolyte interface for MnO2-KBs than that of MnO2-NWs. The multiple tubular interconnecti...
The first demonstration of solid state proton conduction (8.7 × 10−3 S cm−1 at 80 °C, 95% relativ... more The first demonstration of solid state proton conduction (8.7 × 10−3 S cm−1 at 80 °C, 95% relative humidity) of oxygen functionalized few-layer graphene.
Iron oxyhydroxide thin films electrochemically deposited from a non-aqueous medium using metal in... more Iron oxyhydroxide thin films electrochemically deposited from a non-aqueous medium using metal inorganic complexes as a metal ion precursor have been demonstrated as an efficient electrochemical water oxidation catalyst under near neutral as well as alkaline pH conditions.
An economical and simple low temperature chemically assisted reduced graphene synthesis has been ... more An economical and simple low temperature chemically assisted reduced graphene synthesis has been reported and the obtained graphene exhibits very high electrical conductivity (1.6 × 103 S cm−1).
A proof of concept to enhance the specific capacitance and energy density of a supercapacitor has... more A proof of concept to enhance the specific capacitance and energy density of a supercapacitor has been demonstrated wherein reversible 1e- transfer redox chemistry of cations of ionic liquids ([EMIM][EtSO4] and [MIM][HSO4]) which acted as both solvent and electrolyte has been utilized. Outstanding specific capacitance and energy densities in the range of 420-710 F/g and 580-920 Wh/kg, respectively, have been obtained for carbon-based nanomaterials.
The first report of oxygen functionalized few-layer graphene (OFG)
having an interlayer distance ... more The first report of oxygen functionalized few-layer graphene (OFG) having an interlayer distance of 3.6 Å as an excellent proton conductor (8.7 103 S cm1 at 80 8C, 95% RH) utilizing hydrophilic oxygen functionalities present at sheet edges bypassing the theoretical limitation of proton conduction through a basal plane. The synthesized OFG also exhibited excellent supercapacitor performance (296 F g1).
The effect of molecular chirality on electron transmission is explored by photoelectrochemistry. ... more The effect of molecular chirality on electron transmission is explored by photoelectrochemistry. Thiol-terminated chiral scaffold molecules containing a porphyrin chromophore were self-assembled on gold surfaces to form a monolayer. Incorporation of the SAM-coated gold into an electrochemical cell and illumination with visible light generated a cathodic photocurrent. When using circularly polarized light, the photocurrent displayed an asymmetry (different magnitude of photocurrent for right versus left polarization) that changed with the molecular chirality (left- or right-handedness of the scaffold). A symmetry constraint on the electronic coupling between the porphyrin and the organic scaffold is proposed as a possible mechanism for the photocurrent asymmetry.
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Papers by Amit Paul
having an interlayer distance of 3.6 Å as an excellent proton conductor
(8.7 103 S cm1 at 80 8C, 95% RH) utilizing hydrophilic oxygen
functionalities present at sheet edges bypassing the theoretical limitation
of proton conduction through a basal plane. The synthesized OFG
also exhibited excellent supercapacitor performance (296 F g1).
having an interlayer distance of 3.6 Å as an excellent proton conductor
(8.7 103 S cm1 at 80 8C, 95% RH) utilizing hydrophilic oxygen
functionalities present at sheet edges bypassing the theoretical limitation
of proton conduction through a basal plane. The synthesized OFG
also exhibited excellent supercapacitor performance (296 F g1).