Core–shell CuO@NiCoMn-LDH supported by copper foam for high-performance supercapacitors

Abstract

The core-shell structure CuO@NiCoMn-LDH electrode was synthesized by wet chemistry, calcination, and electrodeposition. The synergistic effect of CuO nanowires and NiCoMn-LDH nanosheets has significant enhancement properties to electrode materials. At...

Deformation-Mediated Surface Activation of a Ni–Cu–Mn Ternary Alloy System for Energy Storage in Supercapacitors

“…The spectra also show a satellite peak of nickel (Ni of ∼859.38 eV) on the processed specimen. , The high-resolution scan of Mn 2p shows the presence of the mixed Mn oxide state of Mn 2 O 3 (Mn 3+ of ∼637.05 eV) and MnO 2 (Mn 4+ of ∼645.13 and 643.77 eV) on both specimens. An additional peak at 637.05 eV corresponding to Mn 2+ was also observed in the case of the as-cast specimen. , From the spectra of Cu 2p, it was seen that both Cu + (∼932.6 eV) and Cu 2+ (∼933.7 eV) existed in the mixed oxides along with the satellite peak at 942.74 and 941.74 eV . The O 1s spectra can be deconvoluted into three peaks at 529.9, 531.3, and 533.2 eV, which suggests the formation of metal–O–metal (M–O–M), hydroxides (OH – ), and adsorbed water molecules (H 2 O), respectively …”

“…However, one of the limiting factors of the current supercapacitor technology is their subpar energy density ( E ), given by E = 0.5 CV 2 , where C is the specific capacitance and V is the potential window. In contrast to monolithic systems, multicomponent transition metal oxides (McTMOs) have shown superior energy density, owing to the synergistic effects of hybrid metal oxides/hydroxides. − …”

MOF‐derived NiCo‐LDH Nanocages on CuO Nanorod Arrays for Robust and High Energy Density Asymmetric Supercapacitors

“…Similarly, the Cu 2p spectra of the samples can also be split into two spin‐orbit dipoles. The binding energies at 934.3 (Cu 2p 3/2 ) and 954.2 eV (Cu 2p 1/2 ) are ascribed to the Cu 2+ , whereas the binding energies at 932.1 and 951.9 eV belong to the Cu 2p 3/2 and Cu 2p 1/2 orbitals of Cu 0 [21] . Besides, three satellites are situated at 962.3, 943.8 and 941.3 eV.…”

“…The binding energies at 934.3 (Cu 2p 3/2 ) and 954.2 eV (Cu 2p 1/2 ) are ascribed to the Cu 2 + , whereas the binding energies at 932.1 and 951.9 eV belong to the Cu 2p 3/2 and Cu 2p 1/2 orbitals of Cu 0 . [21] Besides, three satellites are situated at 962.3, 943.8 and 941.3 eV. Compared with CuO, the Cu 2p orbitals of CuO@NiCo-LDH move to higher binding energies, indicating the intensive electronic coupling between CuO and NiCo-LDH, which will ease the electron transfer.…”

Atomic Scale Optimization Strategy of Al-Based Layered Double Hydroxide for Alkali Stability and Supercapacitors

“…To analyze the electrochemical behavior of Ni 2 Co 1 S 4 , the CV curves with small scan rates are carried out, as shown in Figure 6 a. The peak current ( I p , A) and scan rate ( v , mv s −1 ) obey the relationship as follows [ 24 ]: where a and b are the adjustable parameters. The b value is concerned with the charge storage mechanism: (1) b = 0.5, represents the diffusion-controlled mechanism, (2) b ≥ 1.0, represents the surface capacitance-controlled mechanism, (3) 0.5 < b < 1.0, represents a mixing capacitance mechanism.…”