A novel graphite modified paper based cobalt-cobalt oxalate-nickel electrode for the electrooxidation of hydrogen peroxide

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

“…According to Fig. 9d, it can be seen that the characteristic peaks at the binding energies of 285.75 eV and 287.96 eV correspond to the C-O bond, 3,36 and C]O bond, 3,22,35 in the C 1s ne spectrum, respectively, which originate from CoC 2 O 4 . Fig.…”

“…9e shows the binding energy of 530.89 eV in the ne spectrum of O 1s, corresponding to Co(OH) 2 . 22 Fig. 9f displays that the ne spectrum of Co 2p is split into Co 2+ (796.84 eV and 781.20 eV), 15,38 and Co 3+ (795.74 eV and 780.31 eV), 15,34 8) and ( 9)).…”

“…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.…”

“…H 2 C 2 O 4 can modify the morphology and composition of the electrode to improve its catalytic performance. 21,22,30,33,43 The concentration of H 2 C 2 O 4 is one of the important factors affecting the morphology and composition of the modied electrode. NF was deposited in 0.1 mol dm −3 Many studies have proven that Co has good catalytic activity for NaBH 4 .…”

“…This catalyst possessed a significantly increased number of active sites, shortened diffusion path for ions and promoted the effective penetration of the electrolyte. Cheng et al 22 prepared a graphite-modified paper-based cobalt–cobalt oxalate–nickel (FG@Co-CoC 2 O 4 -Ni) electrode using H 2 C 2 O 4 as an etchant to form a special needle-like structure on the electrode surface. In 1.0 mol dm −3 NaOH and 0.2 mol dm −3 H 2 O 2 , FG@Co-CoC 2 O 4 -Ni exhibited an oxidation current density of 270.6 mA cm −2 , which is much higher than that of the FG@Co-Ni electrode.…”