Direct Ink Writing of Graphene–Cobalt Ferrite Hybrid Nanomaterial for Supercapacitor Electrodes

Graphene Inks Printed by Aerosol Jet for Sensing Applications: The Role of Dispersant on the Inks’ Formulation and Performance

“…Nyquist plots typically show two semicircles when examining bare electrochemical electrodes (without graphene), as Figure S8G–I illustrate. The semicircle at high frequency represents the electrode’s internal resistance and the electrode-graphene contact’s resistance [ 76 , 77 , 78 ]. Meanwhile, the semicircle at low frequencies is related to the resistance for charge transfer through the electrode–graphene film contact (diffusion resistance of the electrolyte ions) [ 76 , 77 , 78 ].…”

“…In contrast, following the deposition of graphene nanoflakes such as GTr, GTw, and GGe, the maximum bulk electrolyte resistance of a non-treated screen-printed electrochemical electrode remained at 3 kΩ, indicating that the porous morphology of the deposited graphene nanoflakes provides an accessible surface for electrolyte ions to penetrate deeply into the nanopores. This results in low charge resistance [ 76 , 77 , 78 ]. Alternatively, the low-frequency semicircle gradually shrinks when graphene inks are drop-casted, reducing electrode resistance for charge transfer events at the donor/acceptor interfaces.…”

“…The semicircle at high frequency represents the electrode's internal resistance and the electrode-graphene contact's resistance [76][77][78]. Meanwhile, the semicircle at low frequencies is related to the resistance for charge transfer through the electrode-graphene film contact (diffusion resistance of the electrolyte ions) [76][77][78].…”

Facile synthesis of MnCo2S4 nanosheets as a binder-free electrode material for high performance supercapacitor applications

“…MCS nanosheets were synthesized using the solvothermal method as reported previously. 41–43 Typically, 2 mmol Mn(acac) 2 and 4 mmol Co(acac) 2 were dissolved into 30 mL ODE in a three-neck, round bottom flask, and then the mixture was degassed by nitrogen gas for 30 min at room temperature. The flask was heated to 120 °C, and 10 mmol DDT was quickly injected.…”

Applications of additive manufacturing (AM) in sustainable energy generation and battle against COVID-19 pandemic: The knowledge evolution of 3D printing

“… 5 Direct ink writing 2.7378 2019 2020 Used to create materials with controlled architecture and composition, a computer-controlled translation stage causes a pattern-generating device or ink-deposition nozzle to move [ 144 ]. Currently, being used to make scaffolds (biomedical engineering) [ 145 ], supercapacitor electrodes [ 146 ], micro and nanostructures. 6 3DP device 2.6986 2018 2020 Includes all types of 3D printing devices and their feasible products.…”