Hierarchically structured electrodes for moldable supercapacitors by synergistically hybridizing vertical graphene nanosheets and MnO2

Facile Synthesis of MnO2/Ti3C2Tx/CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor

“…At present, there are usually two strategies to solve the problem. One technique is to obtain high specific surface area MnO 2 nanomaterials by optimizing the preparation process, [6,10,11] such as the hydrothermal method, [12] sol‐gel method, [13] electrochemical deposition [14] . Cakici et al.…”

Current advances and challenges in nanosheet-based wearable power supply devices

“…To meet all these requirements, nanosheets, a kind of two-dimensional (2D) nanomaterial with excellent physical and mechanical properties including ultra-thin thickness, high flexibility, stretchability, and excellent adhesion have triggered great research enthusiasm and become the optimal material for wearable power supply device due to these remarkable characteristics ( Kim et al., 2021 ; Liang et al., 2018 ; Nie et al., 2020 ; Zhong et al., 2019 ). Especially, the extremely large surface-to-volume ratio of the nanosheets provides the miniaturization of wearable power supply devices and greatly increases the capability of power storage and supply for wearable power supply devices ( Jin et al., 2020 ; Zhou et al., 2021 ) considering that nanosheets bring numerous electrocatalytic sites and thus catalyze the electrochemical reaction at the electrode. A large number of nanosheets, e.g., graphene analogues (GA), including graphene oxide (GO) nanosheets, reduced graphene oxide (rGO) nanosheets, and graphdiyne nanosheets, and transition metal element nanosheets, including MoSe 2 nanosheets, Ru-Ni nanosheets, MoS 2 nanosheets, ZnO nanosheet, and organic nanosheets like PLLA nanosheets, have been produced by researchers ( Careta et al., 2021 ; Guo et al., 2019 ; Liu et al., 2021 ; Yang et al., 2019a , 2019b ; Yu et al., 2019 ; Zhang et al., 2018b , 2021 ) since the first-developed nanosheets, graphene, was reported in 2004 ( Novoselov et al., 2004 ).…”

“…Moreover, MnO 2 and vertical graphene nanosheets were applied as the basic materials for a fiber-shaped supercapacitor, which was constructed by Zhou et al. ( 2021 ). After growing the vertical graphene nanosheets (VGNs) on ductile nickel wires, MnO 2 was deposited on the nanostructure of VGNs/NiWs ( Figure 5 iii).…”

“…(c) The conductivity of the Ni(OH) 2 /CNT nanofiber structure with various loads of the nanosheets with 20, 40, 60, and 80 wt%, respectively ( Shi et al., 2018b ). (iii) Schematic illustration of construction procedure of the fiber-shaped supercapacitors ( Zhou et al., 2021 ). …”

Effect of Substrate Types on the Structure of Vertical Graphene Prepared by Plasma-Enhanced Chemical Vapor Deposition

“…Recently, vertical graphene (VG) has attracted great interest from researchers due to its freestanding three-dimensional network structure and inheriting the excellent intrinsic properties of graphene [ 8 , 9 , 10 , 11 ]. Three-dimensional interconnected network structure and rich sharp edges endow VG with many excellent properties, such as high mechanical stability, large specific surface area, and sensitive sensing characteristics [ 12 , 13 , 14 ], which have great potential in various applications (e.g., energy storage, sensors, and thermal management) [ 15 , 16 , 17 , 18 , 19 , 20 ].…”