Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Abstract

Two-dimensional (2D) heterostructures of transition metal oxides (TMOs) are promising candidates for high-performance electrochemical supercapacitors (ESCs). Herein, sub-10 nm 2D SnO2-ZnO heterostructures were constructed on Au-modified SiO2/Si wafers by an atomic layer deposition (ALD) technique for ESC application. The cyclic voltammetry (CV) study revealed the pseudocapacitive-type Faradaic redox reactions of the 2D SnO2-ZnO heterostructure electrode with good reversibility. The electrode exhibited high energy storage capability with a high specific capacitance (C s) of 538.90 F g–1 at a scan rate and current density of 10 mV s–1 and 8.0 A g–1, respectively. The corresponding energy density and the power density were 14.80 Wh kg–1 and 2512.35 W kg–1, respectively, at 8.0 A g–1. The high energy storage capacity of the heterostructure electrode can be ascribed to the combination of improved infiltration and intercalation/deintercalation of electrolyte ions induced by the nanoscale thickness and enhanced redox activity of the heterostructure. Furthermore, the 2D electrode displayed excellent electrochemical robustness with a capacitance retention of 96.3% after 5000 charge/discharge cycles.

Atomic Layer Deposition of Ultra-Thin Crystalline Electron Channels for Heterointerface Polarization at Two-Dimensional Metal-Semiconductor Heterojunctions

“…Within this range of ALD, most of the deposited metal oxide films are amorphous. Our previous studies on ultra-thin TiO 2 [11], WO 3 [15], Ga 2 O 3 [16], In 2 O 3 [7], MoO 3 [12] and SnO 2 [17] films deposited on an Au substrate at the ALD window of 100 • C to 250 • C under O 2 plasma confirmed the semi-amorphous nature of these films.…”

Electrochemical Hydrogen Storage Materials: State-of-the-Art and Future Perspectives

“…Metal oxides have significant potential for development in the field of photocatalysis, sewage treatment, and electrochemical hydrogen storage due to their stable structure, low development cost, and excellent electrochemical performance. , TiO 2 , Fe 2 O 3 , ZnO, SiO 2 , and Co 3 O 4 are commonly used metal oxides. Lopa et al prepared 2D SnO 2 –ZnO heterostructures by atomic layer deposition technique. It was found that the 2D electrodes exhibited excellent electrochemical performance with capacity retention up to 96.3% after 5000 cycles.…”

Telluride‐Based Materials: A Promising Route for High Performance Supercapacitors

“…[34][35][36][37][38][39] Carbons, metal oxides, selenides, nitrides, carbides, sulfides, and phosphides are some of the many materials investigated for their potential in electrochemical energy storage devices. [40][41][42][43][44][45][46][47] The properties of metal chalcogenides (MCs) make them ideal candidates for in-depth research as electrode material for SCs. [48][49][50] The weaker MÀ C (where C represents S, Te, and Se) bonds, as compared to MÀ O bonds, [51][52][53][54] result in MCs exhibiting higher capacity, electronic conductivity, and more facile ion transport pathways.…”

“…Carbons, metal oxides, selenides, nitrides, carbides, sulfides, and phosphides are some of the many materials investigated for their potential in electrochemical energy storage devices [40–47] . The properties of metal chalcogenides (MCs) make them ideal candidates for in‐depth research as electrode material for SCs [48–50] .…”