Integrated Electrode‐Electrolyte Optimization to Manufacture a Real‐Life Applicable Aqueous Supercapacitor with Record‐Breaking Lifespan

Abstract

Aqueous supercapacitors (SCs) have been regarded as a promising candidate for commercial energy storage device due to their superior safety, low cost, and environmental benignity. Unfortunately, an age‐old challenge of achieving both long electrode lifespan and qualified energy‐storage property blocks their practical application. Herein, we develop an electrode‐electrolyte integrated optimization strategy to fulfill the real‐life device requirements. Electrode optimization simultaneously regulates the nanomorphology and surface chemistry of the tungsten oxide anode, resulting in superior electrochemical performance given by an ideal “bird‐nest” structure with optimal oxygen vacancy status; the anodes interact with and are protected from dissolution and structural collapse by the rationally designed hybrid electrolyte with optimized pH and facilitated cation desorption behavior. Collaboratively, a record‐breaking durability of no capacitive decay after 250 000 cycles is achieved. On the basis of this integrated optimization, the first aqueous pouch SCs with real‐life practicability were manufactured by a soft‐package encapsulation technique, which can steadily power commercial 3 C products such as tablets and smartphones and maintain safely working against extreme conditions. This work demonstrates the possibility of using aqueous energy storage devices with enhanced safety and lower cost to replace the commercial organic counterparts for wide range of daily applications.

Exploring the Effect of Ultrafast Intensive Pulsed Light (IPL) Annealing on the Structure and Performance of Cobalt Oxide Electrodes for Supercapacitors

“…However, GCD applies a constant current to the electrode, which can lead to undesired side reactions and electrode degradation if the current is too high. Consequently, the potential window for GCD is limited to avoid these side reactions and HER/OER, always making it less than the CV potential window. , …”

“…Consequently, the potential window for GCD is limited to avoid these side reactions and HER/OER, always making it less than the CV potential window. 35,36 The electrochemical parameters were calculated using the following equations. 37−39 Capacitance (C) at various scan rates (ν, [V/s]) within a specific potential window (ΔE) was calculated using eq 1…”

Defect Engineering of Bi2WO6 for Enhanced Photocatalytic Degradation of Antibiotic Pollutants

“…[7] These issues can be mitigated by defect engineering. [8,9] Of this, grain boundaries, a prototypical 2D defect at the interface between two crystalline domains in a polycrystalline material, are known to play a crucial role in modulating the surface electronic properties across different crystal planes, [10] and endowing the materials with enhanced mechanical attributes, electrical conductivity, magnetic characteristics, and catalytic activity. [11][12][13][14] For instance, Feng and co-workers [15] employed vapor deposition to deposit gold nanoparticles onto carbon nanotubes, and the resulting Au/CNT nanocomposites demonstrated a linear correlation between the surface density of grain boundaries and the catalytic activity toward CO 2 reduction, suggesting that surface grain boundaries served as the catalytic active sites.…”

Oxygen‐Vacancy‐Reinforced Vanadium Oxide/Graphene Heterojunction for Accelerated Zinc Storage with Long Life Span

“…Lithium-ion batteries have occupied significant position in new energy industries owing to their large operating voltage and high energy density. [1][2][3][4][5][6] However, cost, safety, and pollution concerns restrict their application scales and areas, especially in many stationary energy storages. [7][8][9][10] In comparison, multivalent metal-ion batteries using aqueous electrolytes are intrinsically safe and low cost.…”