Flower-like Co3O4 sensor with rich oxygen vacancy defects for enhancing room temperature NOx sensing performances

Oxygen Plasma-Assisted Defect Engineering of Graphene Nanocomposites with Ultrasmall Co3O4 Nanocrystals for Monitoring Toxic Nitrogen Dioxide at Room Temperature

“…This indicates that there is more vacant oxygen in Co 3 O 4 -RGO-60 W. Co 2+ can interact with oxygen to form Co 3+ . Therefore, the more Co 2+ , the more oxygen ions attached on the surface of materials. , This also indicates that the chemisorbed adsorbed oxygen content of Co 3 O 4 -RGO-60 W is the highest. It is well known that vacancy oxygen and chemisorbed adsorbed oxygen will promote gas adsorption on the surface of Co 3 O 4 -RGO. , …”

“…The gas detecting properties of the Co 3 O 4 -RGO-OV-based NO 2 sensor are compared with other NO 2 sensors detailed in literary works. As appeared in Table S1, in comparison with a few of the NO 2 sensors based on immaculate Co 3 O 4 and Co 3 O 4 /RGO composites, ,,,,,, Co 3 O 4 -RGO-60 W shows high response (72.36%) to 20 ppm NO 2 .…”

“…Controlling the defect structure is a compelling strategy to progress the detecting properties of gas sensors . Especially, the presentation of oxygen vacancies (OVs) can lead to lattice distortion, the altering of electrical and physicochemical properties of the materials, so as to assist make strides conductivity and the adsorption of oxygen on metal oxide surface. , Zhang et al prepared flower-like structure Co 3 O 4 with abundant OVs, which displayed the sensitivity (72.3%) to 100 ppm nitrogen oxides than that of Co 3 O 4 nanoparticles . Xu and Ma et al fabricated the composites of CeO 2 -graphene with oxygen vacancies by controlling the degree of oxidation and reduction of Ce 3+ .…”

“…26,27 Zhang et al prepared flower-like structure Co 3 O 4 with abundant OVs, which displayed the sensitivity (72.3%) to 100 ppm nitrogen oxides than that of Co 3 O 4 nanoparticles. 28 Xu and Ma et al fabricated the composites of CeO 2 -graphene with oxygen vacancies by controlling the degree of oxidation and reduction of Ce 3+ . 29 The theoretical calculations illustrated that the introduction of OVs can change the chemical potential, the height of Schottky barrier, and interfacial charge transfer at the CeO 2 /graphene interface, resulting in the enhanced NO 2 sensing performance.…”

Oxygen Vacancy‐Enriched Co3O4 as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

“…Compared with pCo 3 O 4 , the oxygen vacancies of rCo 3 O 4 after NaBH 4 treatment are significantly increased. [55][56][57] To investigate the CO tolerance, CO stripping voltammograms have been measured in 0.5 M H 2 SO 4 solution (saturated with N 2 ). As exhibited in Figure 5 [58] The improved CO tolerance of PtÀ rCo 3 O 4 / C-2 h probably due to the next two reasons: (i) On the one hand, the powerful synergy between Pt and rCo 3 O 4 /C-2 h hybrid can lower the bonding energy of PtÀ CO. [38] (ii) On the other hand, the oxygen vacancy-enriched Co 3 O 4 can activate water molecules to generate plentiful OH ads species adsorbed on the catalyst surface, which could efficiently electro-oxidize to remove the CO adsorbed on the surface of Pt NPs.…”