Binder-Free Porous 3D-ZnO Hexagonal-Cubes for Electrochemical Energy Storage Applications

Abstract

Considerable efforts are underway to rationally design and synthesize novel electrode materials for high-performance supercapacitors (SCs). However, the creation of suitable materials with high capacitance remains a big challenge for energy storage devices. Herein, unique three-dimensional (3D) ZnO hexagonal cubes on carbon cloth (ZnO@CC) were synthesized by invoking a facile and economical hydrothermal method. The mesoporous ZnO@CC electrode, by virtue of its high surface area, offers rich electroactive sites for the fast diffusion of electrolyte ions, resulting in the enhancement of the SC’s performance. The ZnO@CC electrode demonstrated a high specific capacitance of 352.5 and 250 F g−1 at 2 and 20 A g−1, respectively. The ZnO@CC electrode revealed a decent stability of 84% over 5000 cycles at 20 A g−1 and an outstanding rate-capability of 71% at a 10-fold high current density with respect to 2 A g−1. Thus, the ZnO@CC electrode demonstrated improved electrochemical performance, signifying that ZnO as is promising candidate for SCs applications.

Polypyrrole and activated carbon enriched MnCo2O4 ternary composite as efficient electrode material for hybrid supercapacitors

“…The EIS results suggest the enhanced conductivity and rapid diffusion of electrolytic ions inside the electrode materials. 73,74…”

“…The results suggest that during long-run charging/discharging, the material did not undergo any phase change and has retained its original properties. 73…”

“…The EIS results suggest the enhanced conductivity and rapid diffusion of electrolytic ions inside the electrode materials. 73,74 The structural and morphological stability of the optimized composite (MAP-20) material was further assessed after 10 000 cycles of repeated charging-discharging using XRD and FE-SEM analysis. The XRD pattern of MAP-20 after stability is shown in Fig.…”

“…The results suggest that during long-run charging/discharging, the material did not undergo any phase change and has retained its original properties. 73 To test the real-time applicability of the material, its electrochemical performance has been tested in an asymmetric configuration. The MnO 2 /AC (MAC) composite was taken as the negative and MAP-20 as the positive electrode.…”

Synthesis of ZnO/C Nanocomposites via Liquid-Assisted Laser Ablation in an Applied Electric Field for Supercapacitor Applications

“…Namely, by combining metal oxide and carbon counterparts in the nanocomposite, it is possible to enhance the charge storage capacity and thus create a promising supercapacitor electrode material. This approach allows overcoming the drawbacks of both materials and increases the efficiency of charge storage due to the synergistic effects. , In a nanocomposite structure, a carbon-based counterpart accumulates charge through the formation of an electric double layer between the electrode surface and the electrolyte, whereas metal oxides, such as ZnO, RuO 2 , SnO 2 , TiO 2 , MnO 2 , and Fe 3 O 4 , are known to exhibit pseudocapacitance through fast reversible Faraday redox reactions. Carbon-based structures are characterized by such properties as high conductivity, chemical stability, and mechanical strength.…”