Oxygen vacancies promoting the electrocatalytic performance of CeO<sub>2</sub>nanorods as cathode materials for Li–O<sub>2</sub>batteries

Hou, Yue; Wang, Jun; Hou, Chuanxin; Yang, Fan; Zhai, Yanjie; Li, Hongyu; Dang, Feng; Chou, Shulei

doi:10.1039/c9ta00882a

Cited by 92 publications

(62 citation statements)

References 59 publications

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“…At the initial process of discharging, the main peak of Li 2 O 2 (~55.4°) corresponding to a weak peak of Li 2-x O 2 (~56.1°) were detected, which indicated that the Li 2 O 2 was the main discharge product and LiO 2 was the mediate discharge product at the initial stage of discharge. [60,61] When further discharged to 500 mAh g -1 , the peak of Li 2-x O 2 disappeared and the intensity of Li 2 O 2 peak still increased, demonstrating the formation of Li 2 O 2 film. It is worth mentioning that the peak of Li 2-x O 2 reappeared during the initial charging process.…”

Section: Resultsmentioning

confidence: 99%

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Gao-yang¹,

Dang²,

Hou³

et al. 2020

Eng. Sci.

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Single atom CoN -C can be used as a low-cost cathode catalyst for Li-O 2 batteries (LOBs) with abundant highly active sites and high efficient atom utilizations. In the present work, hierarchical porous single atom CoN -C catalyst was prepared through acid etching from a Co/Co-N-C intermediate, featuring an efficient slack of volume expansion, easy mass transmission via the interconnected carbon-framework, and sufficient surface area to accommodate discharge products. The single atom CoN -C catalyst exhibited a superior catalytic capacity for LOBs with a large specific capacity of 14075 mAh g-1 and a long cycle life of 340 cycles. The oxygen reduction reaction (ORR) / oxygen evolution reaction (OER) mechanisms of the discharge products of single atom CoN -C catalyst were identified by using density functional theory (DFT) calculations, showing avenues for improving the future design of single atom catalyst.

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Section: Resultsmentioning

confidence: 99%

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Gao-yang¹,

Dang²,

Hou³

et al. 2020

Eng. Sci.

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“…Recently, the influence of oxygen vacancy on the properties of metal oxides catalysts has also been widely studied . Dang and co‐workers proposed to improve the electrocatalytic activity of CeO 2 nanorods as anode material of lithium–oxygen batteries by adjusting the surface oxygen vacancy concentration, and they found that the higher the oxygen vacancy concentration, the better the electrochemical performance . It can be found that oxygen vacancies can be active sites for the deposition of Li 2 O 2 , and also promote charge transfer in the discharge/charge process.…”

Section: Defective Electrode Materials For Rechargeable Batteriesmentioning

confidence: 99%

“…[112] Dang and co-workers proposed to improve the electrocatalytic activity of CeO 2 nanorods as anode material of lithium-oxygen batteries by adjusting the surface oxygen vacancy concentration, and they found that the higher the oxygen vacancy concentration, the better the electrochemical performance. [113] It can be found that oxygen vacancies can be active sites for the deposition of Li 2 O 2 , and also promote charge transfer in the discharge/charge process. In addition, Kim and co-workers reported that the oxygen vacancy of MnMoO 4 is conductive to achieving high catalytic activity and reversibility of Li-O 2 batteries.…”

Section: Defect Engineering For Li-o 2 Batteriesmentioning

confidence: 99%

Defect Engineering on Electrode Materials for Rechargeable Batteries

et al. 2020

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The reasonable design of electrode materials for rechargeable batteries plays an important role in promoting the development of renewable energy technology. With the in‐depth understanding of the mechanisms underlying electrode reactions and the rapid development of advanced technology, the performance of batteries has significantly been optimized through the introduction of defect engineering on electrode materials. A large number of coordination unsaturated sites can be exposed by defect construction in electrode materials, which play a crucial role in electrochemical reactions. Herein, recent advances regarding defect engineering in electrode materials for rechargeable batteries are systematically summarized, with a special focus on the application of metal‐ion batteries, lithium–sulfur batteries, and metal–air batteries. The defects can not only effectively promote ion diffusion and charge transfer but also provide more storage/adsorption/active sites for guest ions and intermediate species, thus improving the performance of batteries. Moreover, the existing challenges and future development prospects are forecast, and the electrode materials are further optimized through defect engineering to promote the development of the battery industry.

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“…This behavior is in line with the experimental observation of a high nucleation power of ceria NPs deposited on graphene based cathodes. [14][15][16][17] In the adsorption process, the surface oxygen vacancy is filled, and the oxidation of Ce + 3 to Ce + 4 takes place.…”

Section: Discussionmentioning

confidence: 99%

“…[1] Among these issues are the effect of the solvent on the morphology and charge transport properties of the discharge product, [2,3] the use of redox mediators (liquid catalysts), [4][5][6][7][8] modifying the porosity of the carbon cathode, [7,8] and the use of noble metals and metal oxide catalysts. [8][9][10][11][12][13] In this work, we focus on ceria (CeO 2 ), a promising catalyst for LOBs, [14][15][16][17] with the aim to shed light on the mechanisms operating in the nucleation of Li 2 O 2 at stoichiometric and reduced ceria surfaces by means of atomistic simulations based on density functional theory.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Li₂O₂ Nucleation Mechanisms on CeO₂ Catalysts for Lithium‐Oxygen Batteries

et al. 2020

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The addition of ceria (CeO2) nanoparticles to the cathode of a lithium‐oxygen battery results in increased capacity, lower overpotentials and better cyclability. To shed light on the mechanisms of this performance enhancement, we have investigated the early stages of Li2O2 nucleation at stoichiometric and reduced ceria surfaces by means of atomistic simulations based on density functional theory. Adsorption energies are stronger on ceria than on graphene, that is, nucleation mainly would take place on the oxide. The adsorption process of O2 is the one that determines the nucleation sites for the Li2O2 formation on the different CeO2 surfaces. The LiO2 intermediate is adsorbed at the O2 reduction sites. On the reduced (100) surface, the LiO2 tends to adsorb dissociatively, opening up the possibility to the formation of other species than the desired end‐product, Li2O2. On the contrary, optimal properties are found for the reduced (110) surface, which should therefore be the most active surface for Li2O2 nucleation among all low‐index surfaces of ceria. These findings could pave the route to produce better cathodes for Li‐oxygen batteries by the addition of carefully designed ceria nanoparticles, which maximizes the exposition of the most favorable facet.

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Oxygen vacancies promoting the electrocatalytic performance of CeO₂nanorods as cathode materials for Li–O₂batteries

Cited by 92 publications

References 59 publications

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Defect Engineering on Electrode Materials for Rechargeable Batteries

Revealing the Li₂O₂ Nucleation Mechanisms on CeO₂ Catalysts for Lithium‐Oxygen Batteries

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Oxygen vacancies promoting the electrocatalytic performance of CeO2nanorods as cathode materials for Li–O2batteries

Cited by 92 publications

References 59 publications

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Defect Engineering on Electrode Materials for Rechargeable Batteries

Revealing the Li2O2 Nucleation Mechanisms on CeO2 Catalysts for Lithium‐Oxygen Batteries

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Product

Resources

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Oxygen vacancies promoting the electrocatalytic performance of CeO₂nanorods as cathode materials for Li–O₂batteries

Revealing the Li₂O₂ Nucleation Mechanisms on CeO₂ Catalysts for Lithium‐Oxygen Batteries