Inkjet-Printed Ultrathin MoS₂-Based Electrodes for Flexible In-Plane Microsupercapacitors

Abstract

Flexible and wearable energy storage microdevice systems with high performance and safety are promising candidates for the electronics of on-chip integration. Herein, we demonstrate inkjet-printed ultrathin electrodes based on molybdenum disulfide (MoS 2 ) nanosheets for flexible and all-solid-state in-plane microsupercapacitors (MSCs) with high capacitance. The MoS 2 nanosheets were uniformly dispersed in the low-boiling point and nontoxic solvent isopropanol to form highly concentrated inks suitable for inkjet printing. The MSCs were assembled by printing the highly concentrated MoS 2 inks on a polyimide substrate with appropriate surface tension using a simple and low-cost desktop inkjet printer. Because of the twodimensional structure of MoS 2 nanosheets, the as-assembled planar MSCs have high loadings of active materials per unit area, resulting in more flexibility and thinness than the capacitors with a traditional sandwich structure. These planar MSCs can not only possess any collapsible shape through the computer design but also exhibit excellent electrochemical performance (with a maximum energy density of 0.215 mW h cm −3 and a high-power energy density of 0.079 W cm −3 ), outstanding mechanical flexibility (almost no degradation of capacitance at different bending radii), good cycle stability (85.6% capacitance retention even after 10,000 charge−discharge cycles), and easy scale-up. Moreover, a blue light-emitting diode can be powered using five MSCs connected in series. The in-plane and low-cost MSCs with high energy densities have great application potential for integrated energy storage systems including wearable planar solar cells and other electronics.

Recent Developments in All-Solid-State Micro-Supercapacitors Based on Two-Dimensional Materials

“…The SEM image (Figure 5b) shows that the layered MoS 2 formed a uniform 2D conductive network above the pre-printed PEDOT: PSS electrode, which differs from the morphology observed in the ternary composite prepared by Chen and group. They also demonstrated the relationship with the increase of electrode thickness vs. conductivity in Figure 5c and its practical application by powering an LED bulb by connecting MSC in series combination [48].…”

Nickel contamination analysis at cost-effective silver printed paper-based electrodes based on carbon black dimethylglyoxime ink as electrode modifier

“…While screen-printing is the simplest and most employed method, inkjet printing has been suggested as a suitable alternative [30][31][32]. Owing to these benefits, electrochemical sensors [33][34][35][36][37][38] and energy devices [39][40][41][42][43] have recently been reported based on inkjet printing. Inkjetprinted paper electrodes have previously been studied by our research group where a graphene, gold nanoparticle composite was studied in the presence of a mercury film for Nickel detection.…”

Ink Formulation and Printing Parameters for Inkjet Printing of Two Dimensional Materials: A Mini Review

“…Graphene, transition metal dichalcogenides (TMD), boron nitride (BN), black phosphorus (BP), and MXenes are common 2D NSs for inkjet printing [17][18][19][20][21]. These 2D NSs possess different intrinsic properties and thus correspondingly demand different ink formulation strategies [15].…”