Modulating the electronic configuration of Co species in MOF/MXene nanosheet derived Co-based mixed spinel oxides for an efficient oxygen evolution reaction

Abstract

The electronic configuration of Co cations at octahedral (Oct) sites plays a crucial role in the catalytic activity of Co3O4-based spinel oxides toward oxygen evolution reaction (OER). However, there were...

Real Active Site Identification of Co/Co3O4 Anchoring Ni-MOF Nanosheets with Fast OER Kinetics for Overall Water Splitting

“…Notably, Ni NDC/CP, NiCo NDC/CP, and Ni NDC-Co/CP displayed two similar peaks at 7.5 and 14.8°, aligning well with the (001) and (002) facets of the Ni MOF simulation, affirming the successful construction of NDC-based MOF composites. , Intriguingly, the XRD pattern of the Ni NDC-Co/CP catalyst did not reveal any Co 3 O 4 diffraction peaks, in contrast to clear peaks observed in samples collected at the bottom of the solvent thermal reactor (Figure S1), indicating the low-loading Co 3 O 4 modification in the target catalyst. , Raman spectroscopy was performed to further explore the characteristic peaks of Ni NDC/CP, NiCo NDC/CP, and Ni NDC-Co/CP (Figure b). Obviously, the peaks in the range of 1300 to 1800 cm –1 correspond to the characteristics of H 2 NDC organic ligands, and the peak at 668 cm –1 is attributed to the characteristic peak of M–O bonds, once again verifying the sufficient coordination of metal ions and organic ligands. − Compared to Ni NDC/CP and NiCo NDC/CP, Ni NDC-Co/CP exhibited new peaks at around 470, 680, and 1180 cm –1 , indicating the presence of Co 3 O 4 species …”

Tailoring the d-band center of porous CoS2 nanospheres via low-electronegative Fe for weakened OH* adsorption and boosted oxygen evolution

“…12 Consequently, it is highly desired to develop highly active and stable non-noble-metal electrocatalysts. 13–20…”

“…12 Consequently, it is highly desired to develop highly active and stable non-noble-metal electrocatalysts. [13][14][15][16][17][18][19][20] Metallic cobalt pyrite (cobalt disulfide, CoS 2 ) catalysts have been recognized as a prospective alternative to noble metal oxides for the OER in alkaline media. 21 However, the reported CoS 2 electrocatalysts are rarely comparable to the high activity of noble metal oxides due to the strong binding between metal atoms and oxygen-containing intermediates (OH*, O* and OOH*).…”