Journal ArticleDOI
Oxygen Vacancy-rich Porous Co3O4 Nanosheets toward Boosted NO Reduction by CO and CO Oxidation: Insights into the Structure-Activity Relationship and Performance Enhancement Mechanism.
Xinyang Wang,Xinyong Li,Xinyong Li,Jincheng Mu,Shiying Fan,Xin Chen,Liang Wang,Zhifan Yin,Moses O. Tadé,Shaomin Liu +9 more
TLDR
The results indicate that the direct regulation of surface oxygen vacancies could be an efficient way to evidently enhance the catalytic performance for NO reduction by CO and CO oxidation.Abstract:
Oxygen vacancy-rich porous Co3O4 nanosheets (OV-Co3O4) with diverse surface oxygen vacancy contents were synthesized via facile surface reduction and applied to NO reduction by CO and CO oxidation. The structure-activity relationship between surface oxygen vacancies and catalytic performance was systematically investigated. By combining Raman, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and O2-temperature programmed desorption, it was found that the efficient surface reduction leads to the presence of more surface oxygen vacancies and thus distinctly enhance the surface oxygen amount and mobility of OV-Co3O4. The electron transfer towards Co sites was promoted by surface oxygen vacancies with higher content. Compared with the pristine porous Co3O4 nanosheets, the presence of more surface oxygen vacancies is beneficial for the catalytic performance enhancement for NO reduction by CO and CO oxidation. The OV-Co3O4 obtained in 0.05 mol L-1 NaBH4 solution (Co3O4-0.05) exhibited the best catalytic activity, achieving 100% NO conversion at 175 °C in NO reduction by CO and 100% CO conversion at 100 °C in CO oxidation, respectively. Co3O4-0.05 exhibited outstanding catalytic stability and resistance to high gas hour space velocity in both reactions. Combining in situ DRIFTS results, the enhanced performance of OV-Co3O4 for NO reduction by CO should be attributed to the promoted formation and transformation of dinitrosyl species and -NCO species at lower and higher temperatures. The enhanced performance of OV-Co3O4 for CO oxidation is due to the promotion of oxygen activation ability, surface oxygen mobility, as well as the enhanced CO2 desorption ability. The results indicate that the direct regulation of surface oxygen vacancies could be an efficient way to evidently enhance the catalytic performance for NO reduction by CO and CO oxidation.read more
Citations
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Journal ArticleDOI
Oxygen-Deficient Cobalt-Based Oxides for Electrocatalytic Water Splitting.
TL;DR: Based on contemporary efforts for inducing oxygen vacancies in a variety of cobalt oxide types, this work addresses facile and environmentally benign synthesis strategies, characterization techniques, and detailed insight into the intrinsic mechanistic modulation of electrocatalysts.
Journal ArticleDOI
General Fabrication of 3D Hierarchically Structured Bamboo-like Nitrogen-Doped Carbon Nanotube Arrays on 1D Nitrogen-Doped Carbon Skeletons for Highly Efficient Electromagnetic Wave Energy Attenuation.
TL;DR: Experimental results demonstrate that the excellent attenuation properties toward electromagnetic wave energy are relative to high conduction loss at low frequency and high dielectric relaxations at high frequency as well as better impedance matching with the input impedance of the free space.
Journal ArticleDOI
Oxygen Vacancies in Catalyst for VOCs Oxidation: Synthesis, Characterization, Catalytic Effects
TL;DR: In this article , Catalytic oxidation is defined as a significant contributor to atmospheric pollution such as ozone pollution and PM2.5, bring serious harm to the environment and human health.
Journal ArticleDOI
Promoted charge separation from nickel intervening in [Bi2O2]2+ layers of Bi2O2S crystals for enhanced photocatalytic CO2 conversion
TL;DR: In this article, the authors successfully introduced Ni2+ into [Bi2O2]2+ layers in Bi2O 2S crystals via a facile hydrothermal reaction, which markedly enhanced their photocatalytic CO2 reduction performance.
References
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Journal ArticleDOI
Reduced Mesoporous Co3O4 Nanowires as Efficient Water Oxidation Electrocatalysts and Supercapacitor Electrodes
Yongcheng Wang,Tong Zhou,Kun Jiang,Peimei Da,Zheng Peng,Jing Tang,Biao Kong,Wen-Bin Cai,Zhongqin Yang,Gengfeng Zheng +9 more
TL;DR: In this paper, a facile solution reduction method is demonstrated for mesoporous Co3O4 nanowires treated with NaBH4, which leads to efficient surface reduction in solution at room temperature, which allows for retention of the nanowire morphology and 1D charge transport behavior, while at the same time substantially increasing the oxygen vacancies on the surface.
Journal ArticleDOI
Oxygen-Deficient Hematite Nanorods as High-Performance and Novel Negative Electrodes for Flexible Asymmetric Supercapacitors
Xihong Lu,Yinxiang Zeng,Minghao Yu,Teng Zhai,Chaolun Liang,Shilei Xie,Muhammad-Sadeeq Balogun,Yexiang Tong +7 more
TL;DR: The asymmetric-supercapacitor device based on the oxygen-deficient α-Fe2 O3 nanorod negative electrode and a MnO2 positive electrode achieves a maximum energy density of 0.41 mW·h/cm(3) and is capable of charging a mobile phone and powering a light-emitting diode indicator.