In situ transformation of 3D Co3O4 nanoparticles to 2D nanosheets with rich surface oxygen vacancies to boost hydrogen generation from NaBH4

Performance improvement strategies of a cobalt-based electrode for the electrooxidation of sodium borohydride

“…35,37 The deconvolution of the Co 2p ne spectrum (Fig. 6f) showed that Co 2+ (797.69 eV and 782.22 eV) 15,38 and Co 3+ (797.10 eV and 780.72 eV) 22,39 incomplete electrooxidation at a high potential, which produces many bubbles, resulting in unstable electrode.…”

Oxygen and sulfur dual vacancy engineering on a 3D Co3O4/Co3S4heterostructure to improve overall water splitting activity

“…After reduction with NaBH 4 , the DV-Co 3 O 4 /Co 3 S 4 @NF shows a stronger and wider EPR signal at g values of 2.003-2.004, demonstrating the formation of oxygen vacancies and/or sulfur vacancies. 55 Aiming to deeply verify the presence of both oxygen vacancies and sulfur vacancies in the DV-Co 3 O 4 / Co 3 S 4 @NF, photoluminescence (PL) spectroscopy was performed. As depicted in Fig.…”

Maximizing hydrogen production by AB hydrolysis with Pt@cobalt oxide/N,O-rich carbon and alkaline ultrasonic irradiation

“…This should be assigned to the reduction of metal precursors with the reducible Co 3 O 4 inducing the morphology transformation from spheres to nanosheets, which leads to the increase of SSA and the formation of more nanopores in the matrix. 52 To confirm this conclusion, the morphologies of Co 3 O 4 /NC and Pt@Co 3 O 4 /NC were studied by SEM. Fig.…”

“…51 This should be ascribed to the co-reduction of reducible Co 3 O 4 with Pt precursor during the catalyst preparation. 18,52,53 Note that no obvious characteristic peaks equaling to Pt species were detected in the Pt@Co 3 O 4 /NC, which were probably ascribed to the low metal loading and/or the high dispersion of metal NPs. Fig.…”