Facile synthesis of Ni-Co layered double hydroxide with nitrates as interlayer anions via an oxidation-induced anion intercalation process for hybrid supercapacitors

A holistic green system coupling hydrogen production with wastewater valorisation

“…The nitrate anions (NO 3 À ) in the precursor solution serve as the interlayer counter ions in CoNi LDH, which contribute to the expanded interplanar spacing. 23,24 The interlayer spacing of the hydroxides is calculated to be approximately 0.91 and 0.46 nm from the (003) and (006) diffraction peaks, respectively, which are larger than most of those reported previously. 21,[25][26][27][28][29][30][31] For the benefit of water splitting, the increased interlayer distance can expose more active sites to the electrolyte and facilitate mass transfer as well as alleviate structural change during electrochemical reactions.…”

“…38 2H), the two fitting peaks at binding energies of 782.9 and 780.8 eV are ascribed to Co 3+ and Co 2+ , respectively, confirming the co-existence of Co 2+ and Co 3+ ; while, in the Ni 2p spectrum, two nickel species are also observed with the fitting peak of Ni 3+ at 857.3 eV and Ni 2+ at 855.7 eV, respectively. 20,21,24,26,39 The deconvoluted O 1s spectrum for CoNi LDH verifies the existence of OH and M-OH (Figure S7). The surface atomic ratio of Co to Ni is about 4:1 from the quantitative calculation of XPS spectra, consistent with the result from STEM-EDX elemental mapping.…”

Stability-Enhanced α-Ni(OH)2 Pillared by Metaborate Anions for Pseudocapacitors

“…The results show that the anions can influence the morphology, and the expanded interlayer spacing accelerates the diffusion process of active hydroxyl anions. 39 Gunjakar et al produced polyoxovanadate anion-intercalated α-Ni(OH) 2 , and the authors owed the enhanced performance to the increased freely accessible gallery space and electrical conductivity. 40 Zha et al used a one-step hydrothermal method to synthesize acetate anion-intercalated nickel-cobalt hydroxide.…”

“… Tian et al used different amounts of oxidants to change the number of NO 3 – into the interlayers. The results show that the anions can influence the morphology, and the expanded interlayer spacing accelerates the diffusion process of active hydroxyl anions . Gunjakar et al produced polyoxovanadate anion-intercalated α-Ni­(OH) 2 , and the authors owed the enhanced performance to the increased freely accessible gallery space and electrical conductivity .…”

Unlocking the potential of a novel hierarchical hybrid (Ni–Co)Se2@NiMoO4@rGO–NF core–shell electrode for high-performance hybrid supercapacitors

“…5,[7][8][9][10][11][12] In recent years, carbonbased materials and a diverse range of metal oxides/ hydroxides/chalcogenides have been universally diagnosed as capacitive and battery-type materials, respectively. [13][14][15][16][17][18][19][20][21] EDLC materials have long-term cyclic durability, but suffer from low electrochemical performance in HSC devices. 1 In contrast, battery-type materials exhibit swi redox kinetics and outstanding theoretical capacity, nonetheless they always have disappointing rate performance and ultra-long cycling stability.…”