Interface‐Engineered Nickel Cobaltite Nanowires through NiO Atomic Layer Deposition and Nitrogen Plasma for High‐Energy, Long‐Cycle‐Life Foldable All‐Solid‐State Supercapacitors

Abstract

The large‐scale application of supercapacitors (SCs) for portable electronics is restricted by low energy density and cycling stability. To alleviate the limitations, a unique interface engineering strategy is suggested through atomic layer deposition (ALD) and nitrogen plasma. First, commercial carbon cloth (CC) is treated with nitrogen plasma and later inorganic NiCo2O4 (NCO)/NiO core–shell nanowire arrays are deposited on nitrogen plasma–treated CC (NCC) to fabricate the ultrahigh stable SC. An ultrathin layer of NiO deposited on the NCO nanowire arrays via conformal ALD plays a vital role in stabilizing the NCO nanowires for thousands of electrochemical cycles. The optimized NCC/NCO/NiO core–shell electrode exhibits a high specific capacitance of 2439 F g−1 with a remarkable cycling stability (94.2% over 20 000 cycles). Benefiting from these integrated merits, the foldable solid‐state SCs are fabricated with excellent NCC/NCO/NiO core–shell nanowire array electrodes. The fabricated SC device delivers a high energy density of 72.32 Wh kg−1 at a specific capacitance of 578 F g−1, with ultrasmall capacitance decline rate of 0.0003% per cycle over 10 000 charge–discharge cycles. Overall, this strategy offers a new avenue for developing a new‐generation high‐energy, ultrahigh stable supercapacitor for real‐life applications.

Self‐Assembled Nickel Pyrophosphate‐Decorated Amorphous Bimetal Hydroxides 2D‐on‐2D Nanostructure for High‐Energy Solid‐State Asymmetric Supercapacitor

“…Here, to obtain information about the charge contribution of the Ni 2 P 2 O 7 /NiCo‐OH 2D‐on‐2D parallel array electrode, additional kinetic analysis is performed by considering the CV curves. By considering the semi‐infinite linear diffusion, Q s can be derived by using following equationwhere c is a constant and ν is the scanning rate. Using Equation , if we plot the graph of total capacity versus the square root of the scan rate, the intercept of the plot is the capacitive contribution.…”

“…Supercapacitors are considered as one of the most reliable energy storage devices owing to their distinct features including higher power capability, low‐maintenance, nontoxic nature, and excellent cycling stability in contrast to the present Li‐ion battery. Because of these excellent features, presently, supercapacitors are used in many advanced electronic gadgets ranging from portable electronic devices to hybrid electronic vehicles …”

Rapid and Controllable Synthesis of Nanocrystallized Nickel‐Cobalt Boride Electrode Materials via a Mircoimpinging Stream Reaction for High Performance Supercapacitors

“…For this reason, many battery-type "pseudocapacitors" have been developed with the aim of boosting energy densities, including such as heteroatom-doped carbon, [5][6][7] transition metal compounds, [8][9][10] and their hybrids. [11,12] Recently, intensive research works have been focused on the studies of transition metal oxides and hydroxides as ideal pseudocapacitive materials [13][14][15][16][17] for supercapacitors, due to their large theoretical capacitances. However, these transition metal oxides and hydroxides usually have low electronic conductivity and large volume changes during redox reaction processes, thus leading to poor electrochemical stability.…”

Dendritic Nanostructured Waste Copper Wires for High-Energy Alkaline Battery

“…Recycling these metallic waste wires for different energy applications will effectively mitigate economic and environmental concerns [18][19][20][21][22]. To develop an efficient energy storage device that is also cost-effective, it is imperative to search for a common material that could be employed as a current collector, active material, and electrolyte for suitable expanse, as well as possesses adequate energy storage capacity [23,24]. In general, various current collectors have been used to develop energy storage devices, including stainless steel, carbon cloth, Ti foil, and Ni foam [23].…”