Controlled phase evolution from Cu_0.33Co_0.67S₂ to Cu₃Co₆S₈ hexagonal nanosheets as oxygen evolution reaction catalysts

Abstract

Developing cheap and efficient transition metal-based catalysts for the oxygen evolution reaction (OER) plays the key role in large-scale implementation of hydrogen production.

Sustainable and rapid preparation of nanosized Fe/Ni-pentlandite particles by mechanochemistry

“…M ¼ Fe, Co, Ni], recently emerged as promising materials for catalytic purposes 1,2 (e.g. for CO 2 reduction 3,4 and water splitting [5][6][7][8][9][10][11][12] ), energy storage applications 13,14 as well as magnetic devices. 15 This widespread interest can be attributed to the chemically robust nature of pentlandites, its pseudo-metallic conductivity as well as their large exibility of stoichiometric compositions.…”

Engineering Ru/MnCo3Ox for 1,2-Dichloroethane Benign Destruction by Strengthening C–Cl Cleavage and Chlorine Desorption: Decisive Role of H2O and Reaction Mechanism

“…The noticeable presence of satellite peaks at around 785.8 and 802.6 eV confirms the co-existence of Co 2+ and Co 3+ species at the surface of the materials . The Co 2p 3/2 signal at BEs of around 780 and 781.2 eV are, respectively, assigned to the Co 3+ and Co 2+ species . The Co 2p 1/2 peak can be also deconvoluted into two components centered at BEs of around 795.1 and 796.4 eV, which are attributed to the presence of Co 3+ and Co 2+ species, respectively .…”

“…37 The Co 2p 3/2 signal at BEs of around 780 and 781.2 eV are, respectively, assigned to the Co 3+ and Co 2+ species. 38 The Co 2p 1/2 peak can be also deconvoluted into two components centered at BEs of around 795.1 and 796.4 eV, which are attributed to the presence of Co 3+ and Co 2+ species, respectively. 39 Quantitative calculations based on the area intensity ratio of Co 2+ and Co 3+ species yielded a Co 2+ /Co 3+ ratio value for MnCO 3 O x to be 0.88, while that of the Ru/MnCO 3 O x sample is 1.21.…”

Hierarchically porous Ni foam-supported Co and Sn doped Ni3S2 nanosheets for oxygen evolution reaction electrocatalysts

“…7b). 73 It should be noted that the ratio of Co 2+ /Co 3+ (in Co-Ni 3 S 2 ) also increased from 1.04 to 1.30 when co-doped with Sn (CoSn-Ni 3 S 2 @NF), which endorses that the incorporation of Co and Sn ions in the Ni 3 S 2 converted the electronic conguration of Ni ions with the formation of a highly defective structure. Interactions of multivalent Ni and Co ions with different electronic structures in the heazlewoodite phase could afford plenty of active sites that are benecial for the OER.…”