Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

Abstract

Although CoO is a promising electrode material for supercapacitors due to its high theoretical capacitance, the practical applications still suffering from inferior electrochemical activity owing to its low electrical conductivity, poor structural stability and inefficient nanostructure. Herein, we report a novel Cu0/Cu+ co-doped CoO composite with adjustable metallic Cu0 and ion Cu+ via a facile strategy. Through interior (Cu+) and exterior (Cu0) decoration of CoO, the electrochemical performance of CoO electrode has been significantly improved due to both the beneficial flower-like nanostructure and the synergetic effect of Cu0/Cu+ co-doping, which results in a significantly enhanced specific capacitance (695 F g−1 at 1 A g−1) and high cyclic stability (93.4% retention over 10,000 cycles) than pristine CoO. Furthermore, this co-doping strategy is also applicable to other transition metal oxide (NiO) with enhanced electrochemical performance. In addition, an asymmetric hybrid supercapacitor was assembled using the Cu0/Cu+ co-doped CoO electrode and active carbon, which delivers a remarkable maximal energy density (35 Wh kg−1), exceptional power density (16 kW kg−1) and ultralong cycle life (91.5% retention over 10,000 cycles). Theoretical calculations further verify that the co-doping of Cu0/Cu+ can tune the electronic structure of CoO and improve the conductivity and electron transport. This study demonstrates a facile and favorable strategy to enhance the electrochemical performance of transition metal oxide electrode materials.

Dual‐Design of Nanoporous to Compact Interface via Atomic/Molecular Layer Deposition Enabling a Long‐Life Silicon Anode

“…[34] Benefiting from the enhanced electrical conductivity, the electrons generated from the intercalation/de-intercalation reactions can be transferred easily to the current collector, giving rise to facilitated electrochemical kinetics. [35] It has been proved that the Si-SEI dimensional configuration evolves the engulfing of Si domains by the SEI, which leads to the formation of dead Si and the disruption of electron transmission pathways, contributing to capacity fading. [2] We further conduct in-depth XPS analysis to unveil the SEI component after cycling and confirm the enhanced mechanism by MLD/ALD dual-coating.…”

A “one-for-three” strategy through a facile one-step hydrothermal engineering of commercial MoO3 for high-performance proton storage

“…Battery-supercapacitor hybrid (BSH) devices, combining the merits of battery-type electrodes and supercapacitor-type electrodes, are a promising candidate for the next generation of electrical energy storage. [1][2][3] There is no doubt that the electrochemical properties of BSH devices are highly dependent on their electrode materials, which in turn rely on the choice of charge carriers. [4][5][6] Therefore, exploring novel electrode materials and suitable charge carriers for advanced electrochemical performance is the key to the commercialization of BSH devices.…”

Zeolitic Imidazole Framework Sacrificial Template-Assisted Synthesis of NiCoP Nanocages Doped with Multiple Metals for High-Performance Hybrid Supercapacitors

“…The potential difference between the anodic and cathodic peaks (δ = E an – E cath ) of AlCu-NiCoP, Al-NiCoP, Cu-NiCoP, Zn-NiCoP, Cr-NiCoP, and NiCoP are evaluated to be 109, 113, 93, 100, 110, and 128 mV, respectively (Figures a and S9). The decreased δ value of all metal-doped electrodes suggests that the cation dopants within the crystalline structure of NiCoP can effectively enhance the electrochemical reversibility and reaction kinetics by lowering the energy barrier of the redox reactions. , The Cu-NiCoP sample was determined to have the smallest δ value and demonstrated quick redox kinetics and small polarization due to its favorable conductivity and low internal resistance.…”

“…The decreased δ value of all metal-doped electrodes suggests that the cation dopants within the crystalline structure of NiCoP can effectively enhance the electrochemical reversibility and reaction kinetics by lowering the energy barrier of the redox reactions. 44,49 The Cu-NiCoP sample was determined to have the smallest δ value and demonstrated quick redox kinetics and small polarization due to its favorable conductivity and low internal resistance.…”