Electrodeposition of the MnO2 on the Ag/Au Core–Shell Nanowire and Its Application to the Flexible Supercapacitor

Abstract

Supercapacitors have received considerable attention as energy storage devices owing to their high power density, fast charge/discharge rate, and long cyclic life. Especially with an increasing demand for flexible and wearable devices, research on flexible supercapacitors has surged in recent years. The silver nanowire (Ag NW) network has been used as a flexible electrode owing to its excellent mechanical and electrical properties; however, its use as an electrode for flexible supercapacitors has been limited due to insufficient electrochemical stability. In this study, we proposed a method to resolve this issue. We employed a solution process that enabled the coating of the surface of Ag NW by a thin Au shell of ≈ 5 nm thickness, which significantly improved the electrochemical stability of the Ag NW network electrodes. Furthermore, we confirmed for the first time that MnO2, which is one of the most widely used capacitive materials, can be directly electroplated on the AACS NW network electrode. Finally, we fabricated a high-performance and flexible solid-state supercapacitor using the suggested Ag/Au/MnO2 core–shell NW network electrodes.

Fabrication and Seamless Integration of Insensitive-Bending Fully Printed All-in-One Fabric-Based Supercapacitors Based on Cost-Effective MWCNT Electrodes

“…Figure shows the rate capability and Nyquist plot of the all-in-one FSC, which do not change significantly after 1000 bending cycles, indicating the excellent electrochemical stability and durability of the all-in-one FSC. The capacitance retention rate is 97.4% after 1000 bending cycles, which is superior to that of many published flexible supercapacitors (95, 89.4, 95.8, and 92% after 1000 bending cycles). The cross-sectional images of the all-in-one FSC and sandwiched FSC after 1000 bending cycles are shown in Figure .…”

“…The capacitance retention rate is 97.4% after 1000 bending cycles, which is superior to that of many published flexible supercapacitors (95, 46 89.4, 47 95.8, 48 and 92% after 1000 bending cycles 49 ). The cross-sectional images of the all-in-one FSC and sandwiched FSC after 1000 bending cycles are shown in Figure 11.…”

An Ag–Au-PANI core–shell nanowire network for visible-to-infrared data encryption and supercapacitor applications

“…14 Due to the desirable characteristics of the metal NWs, there have been extensive studies that utilized metal NWs to develop highly advanced smart devices such as electromagnetic interference shielding, 15,16 physiological monitoring, 17 virtual reality haptic interface, 18 sensors, 19,20 and air lters. 21 Likewise for supercapacitors, a myriad of reports utilized metal NW networks as a current collector and deposited other supercapacitive materials such as metal oxides, 22,23 conductive polymers, 24,25 and hybrid composites 26 to fabricate core-shell NW-based supercapacitors. Many of these reports demonstrated interesting studies on electrochromic supercapacitors in the visible wavelength region, 23,27,28 but there is no PANI NW-based study that modulates the optical properties of supercapacitors in the infrared-visible multispectral wavelength regions according to the authors' best knowledge.…”

Hierarchical Multiscale Engineered Fe3O4/Ni Electrodes with Ultrafast Supercapacitive Energy Storage for Alternate Current Line‐Filtering

“…[11][12][13][14]24,25] Metal oxides such as RuO 2 , MnO 2 , V 2 O 5 , and spinel-type oxides (e.g., Co 3 O 4 , Fe 3 O 4 ) are representative materials that show pseudocapacitive behaviors. [3,21,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] Despite their higher capacitances relative to EDLC electrodes, low electrical conductivities of most metal oxides, typically on the order of 10 À6 -10 À1 S m À1 , [23,30,43,44] limit their utility for ultrafast response applications. Exceptions exhibiting electrical conductivities close to those of half-metals (%10 4 S m À1 ) or metals (%10 6 S m À1 ) include Fe 3 O 4 and RuO 2 , with RuO 2 receiving more attention.…”