Surface modification of Co3O4 nanostructures using wide range of natural compounds from rotten apple juice for the efficient oxygen evolution reaction

Transforming NiCo2O4 nanorods into nanoparticles using citrus lemon juice enhancing electrochemical properties for asymmetric supercapacitor and water oxidation

“…O Lat represents lattice oxygen in a metal–oxygen structure, O Sur is usually assigned to surface defects and oxygen vacancies, and O Che is assigned to chemisorbed oxygen, as revealed by previous studies. 44 By quantifying the different oxygen species in both samples, the O Sur /O Lat ratio changes from 0.52 to 0.76 from pure NiCo 2 O 4 to sample 2, indicating that there is a greater proportion of surface species in the latter sample that could play an important role in the OER reaction. The detailed XPS peak attributions for pure NiCo 2 O 4 and sample 2 are given in Table S2 †…”

“…The photoelectron contributions for the Co 2p 3/2 signal of pure NiCo 2 O 4 were observed at 779.5 (Co 3+ ), 781.4 (Co 2+ ), 784.2 (satellite) and 788.9 (satellite) eV, which is in good agreement with the reported works. [44][45][46] Similarly, the Ni 2p 3/2 contributions were located at different binding energies of 854.0 (Ni 2+ ), 855.7 (Ni 3+ ), 857.0 (Ni-OH) and 861.1 (satellite) eV. 47 The relative ratio of Ni 2+ /Ni 3+ ions and Co 2+ /Co 3+ ions in pure NiCo 2 O 4 was found to be 1.13 and 0.44, respectively.…”

An advanced PdNPs@MoS2 nanocomposite for efficient oxygen evolution reaction in alkaline media

“…Essentially, the equivalent circuit consisted of the constant phase element (CPE), charge transfer resistance ( R ct ), and solution resistance ( R s ). 31,57 In Table 2, we present the estimated values for charge transfer resistance. In comparison with other materials reported in this work, sample-2 had the lowest charge transfer resistance, which confirms that palladium incorporation into MoS 2 has enhanced sample-2's electrical conductivity, which has further contributed to the efficient operation of OERs.…”

In-situ growth of nonstoichiometric CrO0.87 and Co3O4 hybrid system for the enhanced electrocatalytic water splitting in alkaline media

“…However, there was only a significant difference observed between O-Co-O and Co-O metal oxide peaks at 667 cm -1 and 577 cm -1 , respectively [58,59]. FTIR studies indicated that higher concentrations of potassium chromate resulted in a decrease in metal oxide peaks, which indicates in situ growth of CrO0.87 and Co3O4.…”