Specific capacitance of graphene oxide–metal interfaces at different deoxygenation levels

Hossein-Babaei, Faramarz; Naemidehkharghani, Mehrdad; Razmand, Reza

doi:10.1039/d3ta04461k

J. Mater. Chem. A

2023

DOI: 10.1039/d3ta04461k

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Specific capacitance of graphene oxide–metal interfaces at different deoxygenation levels

Faramarz Hossein-Babaei,

Mehrdad Naemidehkharghani,

Reza Razmand

Abstract: The experimental data available on the electrical features of the graphene oxide/metal (GO/M) interfaces appear sporadic and inconsistent. Here, we fuse the findings from the nanostructural and electrical characterizations on...

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2024

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Cited by 3 publications

References 107 publications

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A High Voltage Symmetric Supercapacitor Comprising Concentrated NaCl: PVA Electrolyte and Partially Reduced Graphene Oxide Electrodes

Shasti,

Hossein‐Babaei

2024

ChemistrySelect

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Strategies to improve energy density in supercapacitors are mainly based on utilizing electrodes providing larger effective surfaces and electrolytes allowing op eration in wider voltage windows. Here, a water‐based, binder‐free, environmentally friendly, high voltage, and quasi‐solid‐state symmetric supercapacitor is presented comprising partially reduced graphene oxide active electrodes and concentrated NaCl: polyvinyl alcohol gel electrolyte. It is shown that the ionic diffusion through the electrode‐electrolyte interface is augmented by the partial reduction of the graphene oxide electrodes up to an optimum level. The safe operation voltage window is 4 V; the high field endurance is attributed to the ion‐saturated hydrogel electrolyte used. At a scan rate of 25 mV/s, the provided capacitance and stored energy are 0.1 F.cm−2 and 5.6 e−5 W.h.cm−2, respectively. The optimized device retains ~90 % of its initial capacitance after 1000 charge‐discharge cycles; no meaningful sign of degradation is detected afterwards up to the 2000 cycles examined. These results place further emphasis on the potentials of the gel polymer electrolytes in the fabrication of environmentally friendly supercapacitors. Our findings are anticipated to accelerate improvements in the properties of the graphene‐based electrodes, particularly in conjunction with the proposed electrolyte.

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A High Voltage Symmetric Supercapacitor Comprising Concentrated NaCl: PVA Electrolyte and Partially Reduced Graphene Oxide Electrodes

Shasti,

Hossein‐Babaei

2024

ChemistrySelect

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1D α-NiMoO4 nanorods/reduced graphene oxide nanocomposite based efficient electrocatalyst for oxygen evolution reaction and p-nitrophenol sensing

Muthu,

Gokila,

Vargheese

et al. 2024

Diamond and Related Materials

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Nonlinear impedance of a micrometer-thick layer of poly(3,4-ethylenedioxythiophen):polystyrene sulfonate

Hossein-Babaei,

Chegini

2024

Applied Physics Letters

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Poly(3,4-ethylenedioxythiophen):polystyrene sulfonate (PEDOT:PSS) is a conductive polymer composite commonly used as a hole-transporting material in various optoelectronic devices. Here, we show that both real and imaginary components of the impedance of a micrometer-thick drop-cast PEDOT:PSS layer measured perpendicular to the layer plane are strongly nonlinear and vary with both amplitude and frequency of the externally applied field. In thinner layers, the impedance approaches linearity; impedances of layers thinner than 100 nm are almost linear within the investigated field and frequency ranges. Impedance nonlinearity is more profound at low-frequencies and almost disappears above 1 kHz. The experimental results are described based on the complex polarization mechanisms prevailing at low-frequencies due to the lazy dynamics of the massive interfacial dipoles formed between PEDOT and PSS chains. The nonlinear impedance of a 2.0 μm-thick layer is utilized for the design and fabrication of a harmonic generator, a frequency adder, and a up/down converter operating at very low frequencies. Operations of a micrometer-thick drop-cast dot of PEDOT:PSS, as a second and third harmonic generator and a passive intermodulator in the frequency range of biological signals are demonstrated. Other polymer composites with large interfacial dipoles are expected to own similar properties.

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Specific capacitance of graphene oxide–metal interfaces at different deoxygenation levels

Abstract: The experimental data available on the electrical features of the graphene oxide/metal (GO/M) interfaces appear sporadic and inconsistent. Here, we fuse the findings from the nanostructural and electrical characterizations on...

Cited by 3 publications

References 107 publications

A High Voltage Symmetric Supercapacitor Comprising Concentrated NaCl: PVA Electrolyte and Partially Reduced Graphene Oxide Electrodes

A High Voltage Symmetric Supercapacitor Comprising Concentrated NaCl: PVA Electrolyte and Partially Reduced Graphene Oxide Electrodes

1D α-NiMoO4 nanorods/reduced graphene oxide nanocomposite based efficient electrocatalyst for oxygen evolution reaction and p-nitrophenol sensing

Nonlinear impedance of a micrometer-thick layer of poly(3,4-ethylenedioxythiophen):polystyrene sulfonate

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