High-performance all-solid-state flexible carbon/TiO₂micro-supercapacitors with photo-rechargeable capability

Abstract

A high-performance all-solid-state flexible interdigitated carbon/TiO 2 micro-supercapacitor (MSC) with photo-rechargeable capability was prepared by combining a laser direct writing technique with electrophoretic deposition of TiO 2 nanoparticles. The carbon/TiO 2 MSC shows the same excellent capacitive performance as the pure carbon MSC, such as high specific capacitance up to 27.3 mF cm À2 at a typical current density of 0.05 mA cm À2, excellent cycling stability, long-time stability, and mechanical stability. Under UV light irradiation, the carbon/TiO 2 MSC can be charged to above 100 mV, and still maintain 60 mV after 10 photo-charging cycles, demonstrating its photo-rechargeable capability. What's more, after 10 photo-charging cycles, the carbon/TiO 2 MSC shows no capacitive performance degradation, which can be attributed to the high structural stability of the carbon/TiO 2 MSC under UV light irradiation.

Integrated Photorechargeable Energy Storage System: Next‐Generation Power Source Driving the Future

“…They also found that the addition of the dye increased the capacitance in the conducting polymer and enhanced the photovoltage in the device. Watanabe et al [ 60 ] prepared a UV light sensitive photoelectrode by electrophoretic deposition of TiO 2 nanoparticles on carbon materials (Figure 4b), in which charges were generated by TiO 2 under illumination and stored in carbon materials. Assembled with another carbon counter electrode, this photocapacitor can be charged to 100 mV under UV irradiation, attributing to the wide bandgap of TiO 2 which exhibited strong response to UV light.…”

“…Reproduced with permission. [ 60 ] Copyright 2017, The Royal Society of Chemistry. c) Synthesis of the core/shell nanorod arrays by a two‐step solution method: hydrothermal for TiO 2 core, followed by chemical bath deposition or electrodeposition for the branch.…”

Integration of Energy Harvesting and Electrochemical Storage Devices

“…However, an external circuit is required for Mode I and therefore energy loss from electrical resistance is inevitable. Discontinuous solar‐cell–EES devices have been widely investigated . Unfortunately, such integration modes cause energy loss due to external resistance and are not compatible with roll‐to‐roll printing and other flexible design.…”

A Quasi 2D Flexible Micro‐Supercapacitor Based on MnO2//NiCo2O4 as a Miniaturized Energy‐Storage Device

“…Many research groups have proposed the use of carbonaceous materials (CNTs, GO, and activated carbon (AC)) for on‐chip micro‐supercapacitors. For instance, GO‐based micro‐supercapacitors have been developed by using different printing techniques, including screen‐printing, ink‐jet printing, and direct laser writing . However, these techniques normally require a rigid template and the jettable precursor ink leads to a cumbrous manufacturing step that lowers the yield efficiency.…”

“…In general, nanostructured materials including metal oxides, [7] graphene oxide (GO), [8][9][10] and carbon nanotubes (CNTs) [11] have been utilized as electrode materials for micro-supercapacitors.M any research groups have proposed the use of carbonaceous materials (CNTs, GO,a nd activated carbon (AC)) for on-chip micro-supercapacitors.F or instance,G O-based micro-supercapacitors have been developed by using different printing techniques,i ncluding screenprinting, [12] ink-jet printing, [13] and direct laser writing. [14,15] However, these techniques normally require ar igid template and the jettable precursor ink leads to ac umbrous manufacturing step that lowers the yield efficiency.T hese processes also confinet he output performance (power density) due to the narrowv oltage range (less than one) and have limited use for the future large-scale devices.T herefore,f urther researcho nt he fabrication of microscale devices via cost-effective processing is important. Researchers have demonstrated metal oxides as ap romising electrodem aterial for energy storage applications due to its advantages of low cost, low toxicity,a nd ease of synthesis.T he nanomaterial-patterned growth can control the surface microstructure and dimensionality of the device.T he possibility of controlling the microstructural features using the solution-basede lectrodeposition method has been recognized as an importanta nd viable Aminiaturized and flexible asymmetric micro-supercapacitor (ASC) based on surface-modified MnO 2 @Aua nd thin nanosheets of NiCo 2 O 4 @Au( termed 2D-qMnO 2 //NiCo 2 O 4 microsupercapacitor) is reported.…”