All-Printed Paper-Based Micro-supercapacitors Using Water-Based Additive-Free Oxidized Single-Walled Carbon Nanotube Pastes

ACS Appl. Energy Mater.

Türker

et al. 2023

In this work, to construct a sunlight-powered energy storage system, single wall carbon nanotubes (SWCNTs)-based symmetric micro-supercapacitors (MSCs) were fabricated by a one-step, facile spraying method. The electrodes exhibited satisfactory conductivity with a sheet resistance of 275 Ω/sq. Moreover, potassium hydroxide-poly(vinyl alcohol) (KOH-PVA) and phosphoric acid-nonionic surfactant liquid crystal (PA-NI LC) gel electrolytes were prepared and applied to design all-solid-state MSC devices. Compared to the device assembled using the SWCNTs/KOH-PVA gel electrolyte, the SWCNTs/PA-NI LC electrolyte displayed larger areal capacitance with the largest recorded value of 11.0 mF•cm −2 at a current density of 0.08 mA• cm −2 at room temperature. Additionally, the effect of temperature on the MSC device performance was assessed, and the results revealed that the device based on the SWCNTs/PA-NI LC electrolyte achieved enhanced electrochemical performance at an operating temperature of 65 °C, including a large areal capacitance of 14.7 mF•cm −2 at 0.08 mA•cm −2 , a better rate performance of 88% with 12.9 mF•cm −2 at 0.4 mA•cm −2 , and a higher energy density of 2.04 μWh•cm −2 at a power density of 40.64 μW•cm −2 . In addition, the MSC device featured high cyclic stability under bending conditions (45 or 90°) at room temperature. Furthermore, a sunlight-powered energy storage system was fabricated, combining solar cells with the as-assembled MSC devices. Three MSCs connected in series were charged by solar cells and further acted as the energy supply for a red light-emitting diode (LED), which could be continuously operated for 2 min 30 s. All of the findings herein represent a good indication of the promising practical application potential of the as-prepared MSC devices as energy storage devices at high temperatures.

Section: Resultsmentioning

confidence: 89%

Wide-Temperature-Range Flexible Micro-Supercapacitors Using Liquid Crystal Gel Electrolyte

ACS Appl. Energy Mater.

Türker

et al. 2023

“…As a consequence, the energy and power densities were further calculated using, respectively, eqs and and are plotted in Figure e. The largest energy density achieved was 1.5 μWh·cm –2 at a power density of 42.5 μW·cm –2 , which is relatively higher than that of the reported MSC devices, such as the fully printed EEG MSC (0.075 μWh·cm –2 at 7.5 μW·cm –2 ), EG20L/nGO20L MSC (0.02 μWh·cm –2 at 0.4 μW·cm –2 ), Ox-SWCNT-MSC-IPL (0.51 μWh·cm –2 at 590 μW·cm –2 ), clay-like Ti 3 C 2 MXene-based MSC device (0.77 μWh·cm –2 at 46,600 μW·cm –2 ), G-CNT-X MSC (1.36 μWh·cm –2 at 250 μW·cm –2 ), GP/PANI-G/GP MSC (0.65 μWh·cm –2 at 236 μW·cm –2 ), MnO 2 /OLC MSC (0.57 μWh·cm –2 at 8 μW·cm –2 ), and paper-based PEDOT:PSS-CNT/Ag MSC (0.01 μWh·cm –2 at 3000 μW·cm –2 ) . Additionally, the cycling stability of the hybrid MSC device was measured.…”

Section: Resultsmentioning

confidence: 97%

“…Basu et al assessed the potential of few-layer graphene electrodes for the application of MSCs; under optimized conditions, the assembled device displayed an areal capacitance of 1.36 mF·cm –2 . Jo et al developed all-printed paper-based flexible MSCs using water-processable, additive-free oxidized single-walled carbon nanotube (CNT) paste, which exhibited a high areal capacitance of up to 23.5 mF·cm –2 and an energy density of 0.51 μWh·cm –2 . However, these paper-based devices are usually prone to damage.…”

Section: Introductionmentioning

confidence: 99%

Facile Assembly of Hybrid Micro-Supercapacitors for a Sunlight-Powered Energy Storage System

ACS Appl. Mater. Interfaces

Zhang

et al. 2022

Herein, hybrid micro-supercapacitors (MSCs), consisting of positive CoNi layer double hydroxides (LDHs) decorated on carbon nanotubes (CoNi LDHs@CNTs) and negative CNT electrodes, were assembled by facile drop-coated and electrodeposition methods. The as-fabricated MSCs were optimized in view of electrochemical performance, and the CoNi LDHs-2@CNTs//CNT MSC exhibited a favorable performance and was thus chosen to be the candidate for MSC device package. The packaged CoNi LDHs-2@CNTs//CNT MSC demonstrated a large areal capacitance of 11.0 mF·cm–2 at a current density of 0.08 mA·cm–2, a good rate performance (56% areal capacitance retained at a higher current density of 0.4 mA·cm–2), and a favorable cycling stability and reversibility (92% of the original areal capacitance was retained after 5000 cycles). Furthermore, the MSC device recorded an energy density of 1.5 μWh·cm–2 at a power density of 42.5 μW·cm–2 and was successfully applied for the storage of energy supplied by solar cells to operate a red light-emitting diode. All these findings demonstrated the promising practical energy storage application of the as-fabricated hybrid MSC devices in the construction of sunlight-powered energy storage systems.

“…The areal energy density and power density are a key metric to assess the energy storage performance of miniaturized supercapacitors . We compared E A and P A of the fabricated Gr@ANS/CNTs MSCs with those of the advanced MSCs in the recent literature, ,,,,,,− as plotted in Figure g, which outperforms that of most other carbon-based MSCs. The achieved MSCs also show excellent cycling stability, as exhibited in Figure f.…”

Section: Resultsmentioning

confidence: 99%

Engineering Interlaced Architecture of Pristine Graphene Anchored with 2-Amino-8-Naphthol 6-Sulfonic Acids for Printed Hybrid Micro-Supercapacitors with High Electrochemical Capability

ACS Appl. Mater. Interfaces

et al. 2022

All-printed flexible micro-supercapacitors (MSCs) based on two-dimensional (2D) nanomaterials with in-plane interdigital configurations are regarded as promising miniaturized power source units, but they chronically suffer from self-aggregation and inadequate matching of electrode materials, thus resulting in inefficient electrolyte ions intercalation. Herein, an innovative multicomponent interlaced architecture essentially consisting of 2amino-8-naphthol 6-sulfonic acid (ANS)-anchored pristine graphene and highly conductive multiwalled carbon nanotubes is reported. The assembled and optimized Gr@ANS electrodes offer sufficient absorption/desorption and redox-active sites, delivering a high areal capacitance of 33.7 mF/cm 2 for screen-printed MSCs. Particularly, the well-modified Gr@ANS/CNTsinterlaced complex structure effectively prevents the usual restacking of the delaminated Gr@ANS nanosheets and maximizes ion accessibility in electrodes. Ascribed to the optimized electron-transferring kinetics, the achieved Gr@ANS/CNTs MSCs exhibit excellent capacitance (40.2 mF/cm 2 and 18.8 F/cm 3 ), simultaneously significantly increasing the rate capability of Gr@ANS MSCs (from 3.9 to 60.0%). Arising from the multicomponent synergism, the all-solid-state MSCs exhibit outstanding bending stability and cycling performance (73.8% after 10 000 charge/discharge cycles). The new charge reservoir engineering evidenced in graphene-based micro-supercapacitors would serve as a stepping stone toward the scalable manufacture of hybrid energy storage micro-devices.