Designing flexible asymmetric supercapacitor with high energy density by electrode engineering and charge matching mechanism

Ribbon-like Nickel Cobaltite with Layer-by-Layer-Assembled Ordered Nanocrystallites for Next-Generation All-Solid-State Hybrid Supercapatteries

“…The electrochemical phenomena taking place during the GCD of the NiCo 2 O 4 ||N-rGO hybrid supercapattery device is illustrated in Scheme . During charging, the diffusion of OH – ions from PVA–KOH to the NiCo 2 O 4 matrix occurs, followed by the electro-oxidation of Ni 2+ , Co 2+ , and Co 3+ , with the release of charge (e – ), under an applied potential of 0.55 V. This process occurs in parallel with the diffusion of K + ions from PVA–KOH and their adsorption on the electroactive surface of N-rGO to form the double layer, along with the charge transfer from the NiCo 2 O 4 to N-rGO. ,, Effectively, the entire process of charge release and transfer (from the positive electrode) and double-layer formation (on the negative electrode) occurs under an applied potential of 1.75 V. Essentially, the charging phenomenon involves diffusion-controlled faradaic as well as non-faradaic processes. During discharging, the reverse phenomena occur, that is, charge transfer from N-rGO to NiCo 2 O 4 , followed by the electroreduction of the oxidized species (of NiCo 2 O 4 ) to generate OH – ions, which occur in parallel with the desorption of K + from the double layer formed on N-rGO .…”

Facile hydrothermal synthesis of cobaltosic sulfide nanorods for high performance supercapacitors

“…Therefore, calculations based on the GCD curves can be performed to obtain a maximum volumetric energy density of 0.87 mW h cm À3 and a power density of 0.89 W cm À3 (Fig. 4f), which is superior to other recently reported devices, such as NiCoS/NF//r-GO-based ASCs (2.04 mW h cm À3 and 42.64 mW cm À3 ), 39 L-VN@AC//a-MnO 2 -based ASCs (8.5 mW h cm À3 and 34.3 mW cm À3 ), 40 CF/ PPY//CNT/MnO 2 -based ASCs (0.27 mW h cm À3 and 24.1 mW cm À3 ), 41 CFF@V 2 O 5 //CFF@AC-based ASCs (0.928 mW h cm À3 and 17.5 mW cm À3 ), 42 MnO 2 /ZnO//rGO-based ASCs (0.234 mW h cm À3 and 133 mW cm À3 ), 43 CPCC@CuO@Mn(OH) 2 //CC@ACbased ASCs (0.18 mW h cm À3 and 18 mW cm À3 ). 44 All the results prove the high performance and practicality of the synthesized electrodes.…”

MoWS2 nanosheets incorporated nanocarbons for high-energy-density pseudocapacitive negatrode material and hydrogen evolution reaction

“…The capacitance trend is analogous to the experimental observations, and the values are in good agreement with recent reports of similar systems. [40][41][42][43][44][45]…”