Oxygen vacancy-confined CoMoO4@CoNiO2 nanorod arrays for oxygen evolution with improved performance

2019 ◽  
Vol 48 (27) ◽  
pp. 10116-10121 ◽  
Author(s):  
Xiaoqiang Du ◽  
Guangyu Ma ◽  
Xiaoshuang Zhang
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Evolution ◽  
Adsorption Energy ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Dft Calculation ◽  
Catalytic Properties ◽  
Nanorod Arrays ◽  
Calculation Results ◽  
Improved Performance

Experimental and DFT calculation results show that the presence of oxygen vacancies can decrease the adsorption energy of intermediates at active sites and facilitate the adsorption of intermediates, thus improving the catalytic properties.

Oxygen vacancies confined in nickel oxide nanoprism arrays for promoted electrocatalytic water splitting

2020 ◽  
Vol 44 (5) ◽  
pp. 1703-1706 ◽  
Author(s):  
Xiaoshuang Zhang ◽  
Xiaoqiang Du
Keyword(s):  
Nickel Oxide ◽  
Water Splitting ◽  
Adsorption Energy ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Dft Calculation ◽  
Catalytic Properties ◽  
Calculation Results

Experimental and DFT calculation results show that the presence of oxygen vacancies can decrease the adsorption energy of intermediates at active sites and facilitate the adsorption of intermediates, thus improving the catalytic properties.

A nickel molybdenum oxide nanoarray as an efficient and stable electrocatalyst for overall water splitting

2020 ◽  
Vol 44 (20) ◽  
pp. 8176-8182 ◽  
Author(s):  
Xiaoshuang Zhang ◽  
Hui Su ◽  
Xiaoqiang Du
Keyword(s):  
Water Splitting ◽  
Molybdenum Oxide ◽  
Adsorption Energy ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Dft Calculation ◽  
Catalytic Properties ◽  
Overall Water Splitting ◽  
Calculation Results

Experimental and DFT calculation results show that the presence of oxygen vacancies can decrease the adsorption energy of intermediates at active sites and facilitate their adsorption, thus improving the catalytic properties.

scholarly journals Effect of Mo Dispersion on the Catalytic Properties and Stability of Mo–Fe Catalysts for the Partial Oxidation of Methanol

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2410
Author(s):  
Shuai Zhang ◽  
Minghan Han
Keyword(s):  
Surface Layer ◽  
Surface Area ◽  
Partial Oxidation ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Catalyst Surface ◽  
Catalytic Properties ◽  
Oxidation Of Methanol ◽  
Partial Oxidation Of Methanol ◽  
Fe Catalysts

Mo–Fe catalysts with different Mo dispersions were synthesized with fast (Cat-FS, 600 r·min−1) or slow stirring speed (Cat-SS, 30 r·min−1) by the coprecipitation method. Improving the stirring speed strengthened the mixing of the solution and increased the dispersion of particles in the catalyst, which exhibited favorable activity and selectivity. The byproduct (dimethyl ether (DME)) selectivity increased from 2.3% to 2.8% with Cat-SS, while it remained unchanged with Cat-FS in a stability test. The aggregation of particles and thin Mo-enriched surface layer decreased the catalyst surface area and slowed down the reoxidation of reduced active sites with Cat-SS, leaving more oxygen vacancies which promoted the formation of DME by the nonoxidative channel.

Oxygen vacancies confined in Co3O4 quantum dots for promoting oxygen evolution electrocatalysis

2019 ◽  
Vol 6 (8) ◽  
pp. 2055-2060 ◽  
Author(s):  
Yun Tong ◽  
Hainiao Mao ◽  
Yanglei Xu ◽  
Jiyang Liu
Keyword(s):  
Quantum Dots ◽  
Oxygen Evolution ◽  
Active Sites ◽  
Oxygen Vacancies

Abundant oxygen vacancies confined in Co3O4 quantum dots provide more efficient Co(ii), more active sites and improved conductivity for superior OER performance.

scholarly journals Electronic and Magnetic Properties Studies on Mn and Oxygen Vacancies Codoped Anatase TiO2

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Zhongpo Zhou ◽  
Xinwei Yang ◽  
Haiying Wang ◽  
Zhaorui Zou ◽  
Jingjing Guo
Keyword(s):  
Magnetic Properties ◽  
Oxygen Vacancy ◽  
Magnetic Moment ◽  
Oxygen Vacancies ◽  
Nearest Neighbor ◽  
Anatase Tio2 ◽  
Experimental Results ◽  
Mn Doping ◽  
Electronic And Magnetic Properties ◽  
Calculation Results

The electronic and magnetic properties of Mn and oxygen vacancies codoped anatase TiO2were investigated. The calculated results showed that the TiO2codoped with Mn and oxygen vacancies have a magnetic moment value of 3.415 μBper Ti31MnO63supercell. Furthermore, Ti31MnO63gets the lowest energy with a geometrical optimization where the Mn ions locate at the nearest-neighbor sites of the oxygen vacancy. And experimental results indicated the magnetism is associated with the defects of Mn ions and oxygen vacancies induced by the Mn doping, which is consistent with the calculation results.

Oxygen vacancy engineered SrTiO3 nanofibers for enhanced photocatalytic H2 production

2019 ◽  
Vol 7 (30) ◽  
pp. 17974-17980 ◽  
Author(s):  
Chuan-Qi Li ◽  
Sha-Sha Yi ◽  
De-liang Chen ◽  
Yan Liu ◽  
Ya-Jie Li ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
H2 Production

Cocatalysts-free SrTiO3 nanofibers with high photocatalytic performance are developed by incorporating oxygen vacancies (OVs), where OVs could steer charge behaviors, serve as active sites and heighten reduction ability of electrons.

P-Doped NiMoO4 parallel arrays anchored on cobalt carbonate hydroxide with oxygen vacancies and mass transfer channels for supercapacitors and oxygen evolution

2019 ◽  
Vol 7 (33) ◽  
pp. 19589-19596 ◽  
Author(s):  
Feifei Wang ◽  
Kui Ma ◽  
Wen Tian ◽  
Juncai Dong ◽  
Han Han ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Oxygen Vacancy ◽  
Oxygen Evolution ◽  
Oxygen Vacancies ◽  
Cobalt Carbonate ◽  
Carbonate Hydroxide ◽  
Parallel Arrays ◽  
Transfer Channels

Phosphate-doped and oxygen vacancy-rich NiMoO4 parallel nanosheets anchored on Co(CO3)0.5(OH)·0.11H2O were synthesized for supercapacitors and oxygen evolution.

Dual-doping of ruthenium and nickel into Co3O4 for improving the oxygen evolution activity

2020 ◽  
Vol 4 (5) ◽  
pp. 1390-1396 ◽  
Author(s):  
Beibei Guo ◽  
Ruguang Ma ◽  
Zichuang Li ◽  
Jun Luo ◽  
Minghui Yang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Oxygen Evolution ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Intrinsic Activity ◽  
Ni Doping ◽  
One Step ◽  
Ru Doping ◽  
Co Doped

Ru and Ni co-doped Co3O4 with improved OER activity were synthesized by a one-step hydrothermal method. Ru doping increases the intrinsic activity, while Ni doping creates more oxygen vacancies and exposes more active sites.

Oxygen vacancy-mediated WO3 nanosheets by etched {200} facets and the efficient visible-light photocatalytic oxygen evolution

2019 ◽  
Vol 43 (41) ◽  
pp. 16391-16395 ◽  
Author(s):  
Yurong Yang ◽  
Jiaming Chen ◽  
Xuelian Liu ◽  
Min Qiu ◽  
Li Liu ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Visible Light ◽  
Oxygen Evolution ◽  
Oxygen Vacancies ◽  
Visible Light Photocatalytic

The abundant oxygen vacancies in WO3 nanosheets result in the significant improvement of the photocatalytic O2 evolution.

Regulating oxygen vacancies in Co3O4 by combining solution reduction and Ni2+ impregnation for oxygen evolution reaction

2021 ◽  
Author(s):  
Jinyu Tang ◽  
Lu Yao ◽  
Xiaoru Ren ◽  
Zhiyu Shao ◽  
Minmin Cai ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Evolution ◽  
Oxygen Vacancies ◽  
Alkaline Condition ◽  
Capacitance Measurement ◽  
Double Layer Capacitance ◽  
Heteroatom Doping ◽  
Step Process ◽  
Energy Chemistry ◽  
Surface Active

Abstract Oxygen vacancies are considered to be an important factor to influence the electronic structure and charge transport of electrocatalysts in the field of energy chemistry. Various strategies focused on oxygen vacancy engineering are proved to be efficient for further improving the electrocatalytic performance of Co3O4. Herein, an optimal Co3O4 with rich oxygen vacancies have been synthesized via a two-step process combining solution reduction and Ni2+ impregnation. The as-prepared electrocatalyst exhibits an enhanced oxygen evolution performance with the overpotential of 330 mV at the current density of 10 mA cm−2 in alkaline condition, which is 84 mV lower than that of pristine one. With the increasing of oxygen vacancies , the charge transfer efficency and surface active area are relatively enhanced reflected by the Tafel slope and double-layer capacitance measurement. These results indicate that combining solution reduction and heteroatom doping can be a valid way for efficient metal oxides-based electrocatalyst development by constructing higher concentration of oxygen vacancy.

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