Understanding the Nature of Ammonia Treatment to Synthesize Oxygen Vacancy-Enriched Transition Metal Oxides

Liu, Dali; Wang, Changhong; Yu, Yifu; Zhao, Bo; Wang, Weichao; Du, Yonghua; Zhang, Bin

doi:10.1016/j.chempr.2018.11.001

Cited by 200 publications

(91 citation statements)

References 73 publications

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“…Since oxygen vacancy with unpaired electron is the main reason of the ESR response in such kind of materials, the higher intensity of ESR signal indicates the occurrence of more defects formed in N‐Co 3 O 4 @NC‐2. The above‐mentioned results confirm that the substitution of lattice O in Co 3 O 4 with N dopants will induce the formation of oxygen vacancies inevitably, which will play critical role in electrocatalysis.…”

Section: Resultsmentioning

confidence: 62%

Defect‐Rich Nitrogen Doped Co₃O₄/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Wang

Chen

et al. 2019

Adv Funct Materials

264

131

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Heteroatom doping plays a significant role in optimizing the catalytic performance of electrocatalysts. However, research on heteroatom doped electrocatalysts with abundant defects and well-defined morphology remain a great challenge. Herein, a class of defect-engineered nitrogen-doped Co 3 O 4 nanoparticles/nitrogen-doped carbon framework (N-Co 3 O 4 @NC) strongly coupled porous nanocubes, made using a zeolitic imidazolate framework-67 via a controllable N-doping strategy, is demonstrated for achieving remarkable oxygen evolution reaction (OER) catalysis. X-ray photoelectron spectroscopy, X-ray absorption fine structure, and electron spin resonance results clearly reveal the formation of a considerable amount of nitrogen dopants and oxygen vacancies in N-Co 3 O 4 @NC. The defect engineering of N-Co 3 O 4 @NC makes it exhibit an overpotential of only 266 mV to reach 10 mA cm −2 , a low Tafel slope of 54.9 mV dec −1 and superior catalytic stability for OER, which is comparable to that of commercial RuO 2 . Density functional theory calculations indicate N-doping could promote catalytic activity via improving electronic conductivity, accelerating reaction kinetics, and optimizing the adsorption energy for intermediates of OER. Interestingly, N-Co 3 O 4 @ NC also shows a superior oxygen reduction reaction activity, making it a bifunctional electrocatalyst for zinc-air batteries. The zinc-air battery with the N-Co 3 O 4 @NC cathode demonstrates superior efficiency and durability, showing the feasibility of N-Co 3 O 4 /NC in electrochemical energy devices.

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Section: Resultsmentioning

confidence: 62%

Defect‐Rich Nitrogen Doped Co₃O₄/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Wang

Chen

et al. 2019

Adv Funct Materials

264

131

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“…1d), indicating that fewer O atoms neighbor around Mn on average [24]. The binding energy of Mn 2p 2/3 decreases to 642.1 eV for L@S, which is attributed to the presence of Mn 3+ and indirectly validates the formation of oxygen vacancies for the charge balance [25,26]. The Mn 2p XPS spectrum of L@S is fitted and shown in Fig.…”

Section: Resultsmentioning

confidence: 84%

Engineering oxygen vacancies in hierarchically Li-rich layered oxide porous microspheres for high-rate lithium ion battery cathode

Cai

Wang

et al. 2019

Sci. China Mater.

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Lithium-rich layered oxides always suffer from low initial Coulombic efficiency, poor rate capability and rapid voltage fading. Herein, engineering oxygen vacancies in hierarchically Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 porous microspheres (L@S) is carried out to suppress the formation of irreversible Li 2 O during the initial discharge process and improve the Li + diffusion kinetics and structural stability of the cathode mateiral. As a result, the prepared L@S cathode delivers high initial Coulombic efficiency of 92.3% and large specific capacity of 292.6 mA h g −1 at 0.1 C. More importantly, a large reversible capacity of 222 mA h g −1 with a capacity retention of 95.7% can be obtained after 100 cycles at 10 C. Even cycled at ultrahigh rate of 20 C, the L@S cathode can deliver stable reversible capacity of 153 mA h g −1 after 100 cycles. Moreover, the full cell using L@S as cathode and Li 4 Ti 5 O 12 as anode exhibits a relatively high reversible capacity of 141 mA h g −1 with an outstanding voltage retention of 97% after 400 cycles at a large current density of 3 C. These results may shed light on the improvement of electrochemical performances of lithiumrich layered oxides via the multiscale coordinated design based on atomic defects, microstructure and composition.

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“…For instance, Zhang and co‐workers synthesized the defective tungsten oxide with rich oxygen vacancies by ammonia‐assisted reduction strategy. Owing to that hydrogen and nitrogen atoms can seize oxygen atoms on the surface, large numbers of oxygen vacancy is formed …”

Section: Defect Engineering On Electrode Materialsmentioning

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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Understanding the Nature of Ammonia Treatment to Synthesize Oxygen Vacancy-Enriched Transition Metal Oxides

Cited by 200 publications

References 73 publications

Defect‐Rich Nitrogen Doped Co₃O₄/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Defect‐Rich Nitrogen Doped Co₃O₄/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Engineering oxygen vacancies in hierarchically Li-rich layered oxide porous microspheres for high-rate lithium ion battery cathode

Defect Engineering on Electrode Materials for Rechargeable Batteries

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Understanding the Nature of Ammonia Treatment to Synthesize Oxygen Vacancy-Enriched Transition Metal Oxides

Cited by 200 publications

References 73 publications

Defect‐Rich Nitrogen Doped Co3O4/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Defect‐Rich Nitrogen Doped Co3O4/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Engineering oxygen vacancies in hierarchically Li-rich layered oxide porous microspheres for high-rate lithium ion battery cathode

Defect Engineering on Electrode Materials for Rechargeable Batteries

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Resources

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Defect‐Rich Nitrogen Doped Co₃O₄/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis

Defect‐Rich Nitrogen Doped Co₃O₄/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis