In Situ Grown Heterostructure Based on MOF-Derived Carbon Containing n-Type Zn–In–S and Dry-Oxidative p-Type CuO as Pseudocapacitive Electrode Materials

Abstract

The rational design of highly oriented and integrated heterostructures based on metal−organic framework (MOF)-derived carbon containing n-type metal chalcogenides (Zn− In−S/C) polyhedron and p-type metal oxide (CuO) nanowires was proposed. The p-type CuO nanowires were used as a stable scaffold to grow MOF-derived n-type Zn−In−S/C. The controlled and in situ fabricated Zn−In−S/C@CuO heterostructures provided a p−n heterojunction which enhanced the charge transfer, hence providing an improved overall electrochemical performance over its MOF and bare CuO counterpart. Coupled with density functional theory (DFT) calculations, the enhancement in the conductivity of the heterostructure was further verified. The symmetric supercapacitor device delivered an energy density of 7 Wh kg −1 at a power density of 4 kW kg −1 . Overall, the theoretical and experimental investigation of the oriented in situ grown Zn−In−S/C@CuO heterojunction with better cycling stability and electrochemical activity could be a useful asset for energy storage devices.

Challenges and Opportunities: Conducting Polymer‐Graphene based Nanocomposites of Metal Oxides and Metal Sulfides for Supercapacitors

“…However, the overall effectiveness of metal oxides (MOs) is reduced by their comparatively poor electrical conductivity as contrasted with carbonaceous materials. [19,38,39] Table 1 presents the theoretical capacitance and conductivity values of the prominent transition metal oxides (TMOs).…”

A Comprehensive Review on Perovskite Solar Cells Integrated Photo‐supercapacitors and Perovskites‐Based Electrochemical Supercapacitors

“…[66] High-performance electrochemical pseudocapacitors commonly use transition metal-oxides (TMOs) and CPs as electrode materials. [67] During the charge/discharge process of a pseudocapacitor, redox reactions take place on the electrode materials, causing charge to pass across the double layer and enabling the Faradic current to pass through the cell. [68] Additionally, electrolyte ions intercalate within the electrode materials during the Faradaic charge transfer process without altering the inherent crystalline properties of the materials.…”

“…Pseudocapacitors store energy using fast and reversible Faradaic redox reactions that occur at or near the electrode surface and the electrochemical adsorption/desorption or intercalation/de‐intercalation of ions into the tunnels of electrode materials through the Faradaic charge transfer process, as illustrated in Figure 5b [66] . High‐performance electrochemical pseudocapacitors commonly use transition metal‐oxides (TMOs) and CPs as electrode materials [67] . During the charge/discharge process of a pseudocapacitor, redox reactions take place on the electrode materials, causing charge to pass across the double layer and enabling the Faradic current to pass through the cell [68] .…”

Electric field-induced ball-cactus-like CuCo2Sx(OH)y nano-heterostructure towards high-performance supercapacitors

“…DFT calculations were performed to investigate the relationship between the energy storage performance and local coordination structures. 71 The model of CuCo 2 S x (OH) y heterostructures was constructed by partially replacing sulfur atoms with oxygen atoms. The constructed 3D atomic structure models of CuCo 2 S 4 and CuCo 2 S x (OH) y are shown in Fig.…”