O 1s轨道精细谱,Fe掺杂后O-Vacancy的浓度增加,这在OER过程中有利于优化金属位点对含氧中间产物的吸附能,并促进M-OOH活性物种的形成,从而提高电催化活性。 图3(a)Fe-Co3O4/NC的XPS全谱图;(b)Fe-Co3O4/NC和Co3O4/NC的C...
oxygen vacancy concentration and diffusion coefficient with the oxidation time. f) The diffusion paths of Zn2+in ZVO with optimal Ob(8%). g) Energy profiles of Zn2+in the diffusion paths with different
Existing defect models for Co-doped ZnO with O vacancy (VO) are controversial in explaining the origin of the magnetism. To address this issue, we investigated the effects of Co doping and VO on the magnetic properties of ZnO through first-principles calculations by using generalized gradient app...
X-ray photoelectron spectroscopy (XPS) and cathodoluminescence (CL) method have been employed to study the chemical composition and the oxygen vacancy concentration of HfO2, Sc2 O3 and (HfO2)1−x(S
This may be due to the singly ionized oxygen vacancies in In2O3, and the emission results from the radioactive recombination of a photogenerated hole with an electron occupying the oxygen vacancy36,37. As compared to In2O3 nanocubes obtained in 450uC, the intensity of emission peaks ...
With the characterization results of various techniques such as XRD, TEM, H 2 -TPR and XPS, the enhancement in the catalytic activity was attributed to the oxygen vacancies generated during the surface reduction process. The catalytic activity of reduced Co 3 O 4 was found to be strongly ...
XPS test results show that the solvothermal process with ethylene glycol at 160 °C introduces oxygen vacancy to Fe2O3 photoanode. The tests of electrochemical impedance spectroscopy and photoelectrochemical impedance spectroscopy indicate that the introduction of the oxygen vacancy significantly improve the...
48), which increases the formation energy of Ir vacancy, effectively suppressing the over-oxidation and leaching of Ir and thus endowing IrOx/MnOx with excellent OER durability (Fig. 4f). To conclude, theoretical calculation ensures the indispensable role of Ir-O-Mn bond-derived electron feeding...
The activation of H2O is a key step of the COS hydrolysis, which may be tuned by oxygen vacancy defects in the catalysts. Herein, we have introduced Cu into Co3O4 to regulate the oxygen vacancy defect content of the catalysts. In situ DRIFTS and XPS spectra reveal that COS and H2O are...
为了探索光生电子的转移方向,分别测量了60ISIO-3h在黑暗和光照下的XPS。与黑暗条件相比,60ISIO-3h复合材料的In 3d和S 2p结合能在光照下向低结合能方向移动(图3d, e) , 而O 1s结合能向高结合能方向移动(图3f),说明光生电子在...