In situ decoration of laser-scribed graphene with TiO2 nanoparticles for scalable high-performance micro-supercapacitors

Rational Formulation of Graphene Nanocomposite Ink for 2D Mutually Embedded Structure Interdigital Microsupercapacitors

“…Meanwhile, based on the mass (1 mg) of the printed electrodes for Gr/MnO 2 -1, the gravimetric specific capacitance ranges from 14.5 to 0.54 when the current density increases from 0.05 to 0.6 A g –1 (Figure S17) current density. More importantly, the maximum areal energy density of the typical Gr/MnO 2 -1 MSCs (⟨ N ⟩ = 8) is 3.22 μW h cm –2 at a power density of 0.018 mW cm –2 , which outperforms that of most other graphene MSCs, such as rGO, LIG, and Gr/CNTs (Figure h). ,,− ,− Moreover, the screen-printed typical Gr/MnO 2 -1 MSC delivers outstanding cycling stability, retaining 79% of initial areal capacitance after cycling 5000 times (Figure i). The electrochemical impedance spectroscopy curve was further measured under different charge–discharge cycles to evidence the capacitance resistance of MSC.…”

In situ formation of Co3O4 nanocrystals embedded in laser-induced graphene foam for high-energy flexible micro-supercapacitors

“…From the GCD This result demonstrates that the rational design of high-performance carbon-based hybrid electrodes is not simply loading more electroactive materials, but should have more electrochemically active sites and short transport path lengths for both electrons and ions. The specific capacitance of the Co 3 O 4 @LIG-MSC is superior to those of previously reported MSCs, such as the graphene-MSC (80.7 μF cm −2 at 200 mV s −1 ), 33 onion-like carbon-MSC (0.9 mF cm −2 at 100 V s −1 ), 34 RGO-GO-RGO-MSC (0.51 mF cm −2 ), 35 LSG-MSC (2.32 mF cm −2 at 16.8 mA cm −3 ), 36 graphene-based textile MSC (0.76 mF cm −2 at 1 mA cm −2 ), 37 TiO 2 -graphene MSC (6.8 mF cm −2 at 5 µA cm −2 ), 38 and CNT-MSC (9 mF cm −2 at 0.5 mA cm −2 ). 39 In addition to high specific and areal capacitances, the Co 3 O 4 @LIG-MSC exhibits good rate capability (with the 30-fold increase in the discharge current while the specific capacitance gradually decreases from 143.5 F g −1 to 113.4 F g −1 , according to the capacitance retention of 79.0% at 30 A g −1 ).…”

A Review on the Production Methods and Applications of Graphene-Based Materials

“…Until now, several published review articles have explored the production process, physical and chemical properties, as well as applications of graphene-based materials, which can be used in diversified application areas [ 46 , 47 , 48 , 49 , 50 , 51 , 52 ]. However, almost all primarily focused on a single application field and studied the material development, their characteristics, and applications only for that particular area, for example, sensors and biosensors [ 53 , 54 , 55 , 56 ], energy storage and supercapacitors [ 57 , 58 , 59 , 60 , 61 , 62 ], and biomedical and drug delivery [ 63 , 64 , 65 , 66 ]. There is a scarcity of review articles on graphene-based materials to comprehensively cover all the production processes of graphene derivatives such as pure and composite graphene fibres, graphene/polymer composite (gPCs), and graphene/fibre/polymer composites (gFPCs), and their applications in various fields such as energy, wearable technology, agriculture, wastewater treatment, medical, healthcare, and in the automobile industry.…”