Green synthesis of MnCo2O4 nanoparticles grown on 3D nickel foam as a self-supported electrode for oxygen evolution reaction

A new layered barium cobaltite electrode for protonic ceramic cells

“…3a depicts the high-resolution spectrum of the Co 2p 3/2 region, which was fitted to accommodate two main components: Co 3+ (779.619 eV) and Co 2+ (781.135 eV), in agreement with previous works. 40,41 The presence of a Co 3+ /Co 2+ ratio higher than unity (1.842) at the surface is in line with the average BVS estimated from Rietveld refinement for the bulk (Table 1), in which a higher oxidation state of Co was also found.…”

S-Doped Ni0.5Co0.5Fe2O4 Porous Single-Crystalline Nanosheets for Electrocatalytic Oxygen Evolution

“…Current research focuses on non-precious metal compounds, such as Fe, Ni, Co, and Mn-based oxides, sulfides, and hydroxides. − Some of these compounds are indeed prospective catalysts to activate OER. For instance, Co- and Fe-based oxides are stable in alkaline media; their OER properties are not so much different from those of Ru and Ir oxides. , In particular, spinel type oxides (general formula AB 2 O 4 ) have been accepted as promising OER catalysts owing to their multiple valence of cations and their ability to transform between different oxidation states. − Among spinel oxide structures, spinel ferrite (MFe 2 O 4 , M = Co, Ni, Mn, etc.) has attracted special attention because of their low price, high catalytic activity, and high durability. , In particular, cobalt ferrite (CoFe 2 O 4 ) is the focus of research as a promising catalyst for water splitting.…”