Tuning oxygen vacancies in spinel nanosheets for binder-free oxygen cathodes with superior catalytic activity in zinc-air batteries

2022 ◽  
Vol 521 ◽  
pp. 230918
Author(s):  
Kelong Ao ◽  
Jihong Shi ◽  
Xiangyang Zhang ◽  
Walid A. Daoud
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Free Oxygen ◽  
Binder Free ◽  
Zinc Air Batteries

scholarly journals Deposition of binder-free oxygen-vacancies NiCo2O4 based films with hollow microspheres via solution precursor thermal spray for supercapacitors

2019 ◽  
Vol 45 (8) ◽  
pp. 10722-10732 ◽  
Author(s):  
Yangzhou Ma ◽  
Zexin Yu ◽  
Meimei Liu ◽  
Chen Song ◽  
Xuanning Huang ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Oxygen Vacancies ◽  
Hollow Microspheres ◽  
Free Oxygen ◽  
Solution Precursor ◽  
Binder Free

scholarly journals Highly Dispersed Pd Species Supported on CeO2 Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 772
Author(s):  
Yanxiong Liu ◽  
Changhua Hu ◽  
Longchun Bian
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Methane Combustion ◽  
Pd Nanoparticles ◽  
High Concentration ◽  
Ch4 Combustion ◽  
Highly Active ◽  
Δ Phase ◽  
Occurrence State ◽  
Comprehensive Characterization

The correlation between the occurrence state of surface Pd species of Pd/CeO2 for lean CH4 combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized a highly active 0.5% PdO/CeO2-RE catalyst, in which the Pd nanoparticles are evenly dispersed on the CeO2 nanorods CeO2-R. Based on comprehensive characterization, we have revealed that the uniformly dispersed Pd nanoparticles with a particle size distribution of 2.3 ± 0.6 nm are responsible for the generation of PdO and PdxCe1−xO2−δ phase with –Pd2+–O2−–Ce4+– linkage, which can easily provide oxygen vacancies and facilitate the transfer of reactive oxygen species between the CeO2-R and Pd species. As a consequence, the remarkable catalytic activity of 0.5% Pd/CeO2-RE is related to the high concentration of PdO species on the surface of the catalyst and the synergistic interaction between the Pd species and the CeO2 nanorod.

scholarly journals On the Effects of Doping on the Catalytic Performance of (La,Sr)CoO3. A DFT Study of CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 312 ◽  
Author(s):  
Antonella Glisenti ◽  
Andrea Vittadini
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Formation Energy ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Energy Profiles ◽  
High Concentrations ◽  
3D Impurities

The effects of modifying the composition of LaCoO3 on the catalytic activity are predicted by density functional calculations. Partially replacing La by Sr ions has benefical effects, causing a lowering of the formation energy of O vacancies. In contrast to that, doping at the Co site is less effective, as only 3d impurities heavier than Co are able to stabilize vacancies at high concentrations. The comparison of the energy profiles for CO oxidation of undoped and of Ni-, Cu-m and Zn-doped (La,Sr)CoO3(100) surface shows that Cu is most effective. However, the effects are less spectacular than in the SrTiO3 case, due to the different energetics for the formation of oxygen vacancies in the two hosts.

Effects of rare earth metal doping on Au/ReZrO2 catalysts for efficient hydrogen generation from formic acid

2021 ◽  
Vol 45 (12) ◽  
pp. 5704-5711
Author(s):  
Luming Wu ◽  
Yu Hao ◽  
Shaohua Chen ◽  
Rui Chen ◽  
Pingchuan Sun ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rare Earth ◽  
Rare Earth Metal ◽  
Oxygen Vacancies ◽  
Hydrogen Generation ◽  
Earth Metal ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Metal Doped

Rare earth metal doped ZrO2 can promote the formation of oxygen vacancies in zirconia, which enhances the metal–support interaction, finally promoting catalytic activity of FA dehydrogenation.

scholarly journals Atomically Dispersed Transition Metal-Nitrogen-Carbon Bifunctional Oxygen Electrocatalysts for Zinc-Air Batteries: Recent Advances and Future Perspectives

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Fang Dong ◽  
Mingjie Wu ◽  
Zhangsen Chen ◽  
Xianhu Liu ◽  
Gaixia Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reduction Reaction ◽  
Bifunctional Catalysts ◽  
Future Perspectives ◽  
Manufacturing Costs ◽  
Environmental Friendliness ◽  
Specific Energy Density ◽  
High Metal ◽  
Kinetics Of ◽  
Zinc Air Batteries

AbstractRechargeable zinc-air batteries (ZABs) are currently receiving extensive attention because of their extremely high theoretical specific energy density, low manufacturing costs, and environmental friendliness. Exploring bifunctional catalysts with high activity and stability to overcome sluggish kinetics of oxygen reduction reaction and oxygen evolution reaction is critical for the development of rechargeable ZABs. Atomically dispersed metal-nitrogen-carbon (M-N-C) catalysts possessing prominent advantages of high metal atom utilization and electrocatalytic activity are promising candidates to promote oxygen electrocatalysis. In this work, general principles for designing atomically dispersed M-N-C are reviewed. Then, strategies aiming at enhancing the bifunctional catalytic activity and stability are presented. Finally, the challenges and perspectives of M-N-C bifunctional oxygen catalysts for ZABs are outlined. It is expected that this review will provide insights into the targeted optimization of atomically dispersed M-N-C catalysts in rechargeable ZABs.

Molten salts-assisted synthesis of special open-cell Fe, N co-doped porous carbon as an efficient electrocatalyst for zinc-air batteries

2021 ◽  
Author(s):  
Xiaoying Gao ◽  
Xuan Xie ◽  
Kanjun Sun ◽  
Xiaofei Lei ◽  
Tianyu Hou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Porous Carbon ◽  
Molten Salts ◽  
Low Cost ◽  
High Catalytic Activity ◽  
Open Cell ◽  
Co Doped ◽  
Excellent Stability ◽  
Zinc Air Batteries

Fe, N co-doped carbon electrocatalyst is one of the most attractive alternatives to Pt/C catalysts due to its high catalytic activity, excellent stability and low cost. However, obtaining stable and...

scholarly journals Flexible self-supported bi-metal electrode as a highly stable carbon- and binder-free cathode for large-scale solid-state zinc-air batteries

2020 ◽  
Vol 272 ◽  
pp. 118953 ◽  
Author(s):  
Nengneng Xu ◽  
Joshua A. Wilson ◽  
Yu-Dong Wang ◽  
Tianshun Su ◽  
Yanan Wei ◽  
...  
Keyword(s):  
Solid State ◽  
Large Scale ◽  
Metal Electrode ◽  
Stable Carbon ◽  
Binder Free ◽  
Zinc Air Batteries

Enhancing the cycle stability of Li–O2 batteries via functionalized carbon nanotube-based electrodes

2020 ◽  
Vol 8 (8) ◽  
pp. 4263-4273
Author(s):  
Young Shik Cho ◽  
Hyunjin Kim ◽  
Minhoo Byeon ◽  
Dong Young Kim ◽  
Hyeokjun Park ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Oxygen Electrode ◽  
Cycle Stability ◽  
Free Oxygen ◽  
Binder Free ◽  
Functionalized Carbon Nanotube ◽  
Enhanced Stability

3,5-Bis(trifluoromethyl)phenylmaleimide functionalized CNT buckypapers are prepared as a binder-free oxygen electrode for Li–O2 batteries with increased capacity and enhanced stability.

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