Macro-/meso-porous NiCo2O4 synthesized by template-free solution combustion to enhance the performance of a nonenzymatic amperometric glucose sensor

Mingled MnO2 and Co3O4 Binary Nanostructures on Well-Aligned Electrospun Carbon Nanofibers for Nonenzymatic Glucose Oxidation and Sensing

“…Intimate contact of the heterogeneous interfaces with glucose molecules with minimal diffusion resistance is achieved . Besides, such hybrid nanomaterials integrate the fine electronic configuration of the semiconductor of MnO 2 and Co 3 O 4 , which have more valence states to provide more redox reactions. , It is plausible that the charge transfers from the p orbital of O in the glucose molecules to the d orbital of Mn and Co in the nanocomposite enhance the density of state (DOS) of Mn and Co d-orbitals near the Fermi level after anchoring glucose molecules. The presence of occupied states near the Fermi level would be in favor of metal ions to transfer charges from the glucose through redox reactions.…”

“…The O 1s spectrum (Figure S2) is composed of three peaks at 529.6, 530.8, and 532.4 eV, which are attributed to oxygen states in the Co 3 O 4 and MnO 2 crystal lattice, the O x − (O − or O 2 − ) ion absorbed by the oxygendeficient region of the hybrid nanomaterial lattice, and additional physically absorbed and/or chemisorbed oxygen caused by the surface hydroxyl. 26,63 These functional groups will be beneficial to the electrocatalytical performance, owing to improving the wettability between the electrode and electrolyte.…”

“…In particular, the two principal peaks are fitted into four subpeaks, wherein the two peaks at 779.9 and 795.1 eV with the satellite peak at 786.9 eV prove the chemical nature of Co 3+ , and the fitting peaks at 780.6 and 796.7 eV with the satellite peak at 803.4 eV are indexed to Co 2+ . , These results verify the presence of the Co 3 O 4 phase in the as-fabricated MnO 2 /Co 3 O 4 @ECNFs. The O 1s spectrum (Figure S2) is composed of three peaks at 529.6, 530.8, and 532.4 eV, which are attributed to oxygen states in the Co 3 O 4 and MnO 2 crystal lattice, the O x – (O – or O 2 – ) ion absorbed by the oxygen-deficient region of the hybrid nanomaterial lattice, and additional physically absorbed and/or chemisorbed oxygen caused by the surface hydroxyl. , These functional groups will be beneficial to the electrocatalytical performance, owing to improving the wettability between the electrode and electrolyte.…”

Co/CoO nanoparticles armored by N-doped nanoporous carbon polyhedrons towards glucose oxidation in high-performance non-enzymatic sensors

“…Currently, it is of significance for diabetes management, food processing and bioengineering to supervise glucose quantitatively. 1 Many analytical techniques such as colorimetry, gas chromatography, and fluorescence and electrochemical sensing have been recently developed for the in vitro or in vivo determination of glucose in human serum and food products. 2–5 Among such methods, electrochemical sensing can offer outstanding sensitivity, fast response time, portability and good selectivity, and thus has attracted more research interest.…”

“…5,8–13 Among them, the first row transition metals, for example Co, Ni and Cu based metal oxides have been studied for use in this field. 1,7,14 However, pristine nanosized metal oxides often suffer from poor electrical conductivity and stabilities, which limits their further applications. The introduction of hollow carbon materials is used to fabricate new and effective catalysts to improve catalytic activities.…”