Approaching High‐Performance Supercapacitors via Enhancing Pseudocapacitive Nickel Oxide‐Based Materials

Abstract

Nickel oxide, as a typical pseudocapacitive material, holds great promise for boosting the energy storage capability of supercapacitors (SCs) owing to its great advantages, such as high theoretical capacitance value, low‐cost, good stability, and environmentally benign nature. Nevertheless, many obstacles, including low intrinsic conductivity and limited surfice electrochemically active sites, need to be overcome before its practical implementation. In this review, the recent advances on nickel oxide‐based electrode materials are outlined with particular attention paid to strategies for enhancing their SC performance. To begin, an introduction to the physical and chemical properties of nickel oxide and its charge storage mechanisms is presented, followed by a discussion of the obstacles to its widespread implementation and the corresponding strategies for constructing high‐performance nickel oxide‐based electrode materials. After that, recent progress in the use of organic electrolyte systems to achieve improvements in integrated device performance is highlighted. To conclude, a detailed discussion on future trends and opportunities associated with NiO‐based electrode materials for future SCs is provided.

Three-dimensional nano-folded transition-metal oxide electrode materials for high-performing electrochemical energy-storage devices

“…Fig. 3a displays the CV curves of the Ni@NiO-35 A electrode at different scan rates, revealing the electrochemical redox properties of the 3D nano-folded Ni@NiO with a pair of redox peaks at the potential of 0–0.5 V. Specifically, a pair of redox peaks can be observed at the potential locations of 0.35 V and 0.17 V, which are mainly from the reversible redox reaction of NiO as follows: 29,30 NiO + OH − ↔ NiOOH + e − …”

Advanced Photonic Processes for Photovoltaic, Energy Storage, and Environmental Systems

“…Notably, the SC market remains on a rising path, with an anticipated value of USD 450 million in 2019 and a compound annual growth rate of 14.1% during the forecast period (2019–2024). [ 130 ] In ref. [131], they demonstrated in situ conversion of commercial polyimide (PI) films into porous graphene through laser direct writing for the fabrication of flexible supercapacitors with enhanced capacitive performance.…”

A Review of Redox Electrolytes for Supercapacitors

“…Despite making considerable progress, the low decomposition voltage of water (1.23 V) leads to a poor energy density of SCs (Yi et al, 2020). It is also reported that the cycle performance of SCs will deteriorate after adding redox additives to the aqueous electrolytes (Chodankar et al, 2016;Singh and Chandra, 2016).…”

“…Supercapacitors (SCs) are a new type of energy storage equipment filling the gap between secondary batteries and traditional capacitors (Hui et al, 2019;Poonam et al, 2019;Zhi-yu et al, 2019;Alipoori et al, 2020;Cheng et al, 2020;Iqbal et al, 2020;Li and Liang, 2020;Mohd Abdah et al, 2020;Panda et al, 2020;Yi et al, 2020). SCs are believed to be one of the most promising candidates due to their fast charging/discharging capability, long cycle life, high power density, and high safety (Zhang W. et al, 2017;Zhang et al, 2018;Afif et al, 2019).…”