Journal of Energy Chemistry, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 1, 2024
Language: Английский
Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(1)
Published: Nov. 13, 2023
Abstract The development of industry and agriculture has been accompanied by an artificially imbalanced nitrogen cycle, which threatens human health ecological environments. Electrocatalytic systems have emerged as a sustainable way converting nitrogen‐containing molecules into high value‐added chemicals. However, the construction high‐performance electrocatalysts remains challenging. oxygen vacancy engineering strategy promoted more research efforts to explore structure‐activity relationship between catalytic activity vacancies. This review systematically summarizes recent vacancies‐rich metal oxides for electro‐catalyzing cycling systems, involving electrocatalytic nitrate reduction reaction, nitric oxide C─N coupling, urea oxidation reaction. First, methods characterization vacancies are summarized. Then, effect on is discussed in terms regulating electronic structures electrocatalysts, improving electroconductivity catalysts, lowing energy barrier, strengthening adsorption activation intermediate species. Finally, future directions cycle anticipated.
Language: Английский
Citations
61
ACS Nano, Journal Year: 2023, Volume and Issue: 18(1), P. 337 - 346
Published: Dec. 19, 2023
Layered oxides are widely accepted to be promising cathode candidate materials for K-ion batteries (KIBs) in terms of their rich raw and low price, while further applications restricted by sluggish kinetics poor structural stability. Here, the high-entropy design concept is introduced into layered KIB cathodes address above issues, an example K0.45Mn0.60Ni0.075Fe0.075Co0.075Ti0.10Cu0.05Mg0.025O2 (HE-KMO) successfully prepared. Benefiting from oxide with multielement doping, developed HE-KMO exhibits half-metallic features a narrow bandgap 0.19 eV. Increased entropy can also reduce surface energy {010} active facets, resulting about 2.6 times more exposure facets than low-entropy K0.45MnO2 (KMO). Both effectively improve electron conduction K+ diffusion. Furthermore, high inhibit space charge ordering during (de)insertion, transition metal–oxygen covalent interaction enhanced, leading suppressed phase 1.5–4.2 V better electrochemical stability (average capacity drop 0.20%, 200 cycles) KMO 0.41%, wide voltage window.
Language: Английский
Citations
39
Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(43)
Published: June 21, 2023
Abstract Anionic and cationic redox chemistries boost ultrahigh specific capacities of Li‐rich Mn‐based oxides cathodes (LRMO). However, irreversible oxygen evolution sluggish kinetics result in continuous capacity decay poor rate performance, restricting the commercial fast‐charging application for lithium ion batteries. Herein, local electronic structure LRMO is appropriately modulated to alleviate release, enhance anionic reversibility, facilitate Li + diffusion via facile surface defect engineering. Concretely, vacancies integrated on reduce density states O 2p band trigger much delocalized electrons distribute around transition metal, resulting less enhancing reversible MnO 6 octahedral distortion. Besides, partially reduced Mn lattice synchronously stimulate electrochemical activity conductivity, rate, fast charge transfer. Therefore, modified exhibits enhanced cyclic stability capability: a high discharging 212.6 mAh·g −1 with 86.98% retention after 100 cycles at 1 C obtained its 80%, SOC shortened 9.4 min 5 charging rate. This work will draw attention boosting capability modulation.
Language: Английский
Citations
35
Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 689, P. 137194 - 137194
Published: Feb. 28, 2025
Language: Английский
Citations
1
Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown
Published: March 18, 2025
Abstract At present, atomic‐scale defect engineering has become a primary strategy for precisely regulating the inherent properties associated with electronic structure of semiconductors. However, concurrent phenomena and factors during introduction defects constrain researchers’ understanding correlation between desired in various transition metal oxides, electromagnetic parameters, wave absorption. In this study, MnO 2 nanoneedle arrays are pre‐prepared on surface SiC nanowire‐based carriers via hydrothermal method, subsequently, oxygen vacancy is successfully introduced into as‐fabricated sample by simple calcination process. By adjusting heat‐treatment temperature, accumulation‐induced situ phase transformation from to Mn 3 O 4 , creating intrinsic heterointerfaces. Under synergistic effects vacancy‐induced dipole polarization interfacial derived @Mn heterogenerous interface, optimal exhibits minimum reflection loss (RL min ) −47.96 dB at matching thickness 1.90 mm, along favorable effective absorption bandwidth (EAB) 6.40 GHz covering entire Ku band 2.02 mm. This work pionners defect‐driven elucidate relationship concentration, heterostructure interface properties, EMW capabilities, paving way practical application
Language: Английский
Citations
1
Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 137392 - 137392
Published: March 1, 2025
Language: Английский
Citations
1
Journal of Materials Chemistry A, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 1, 2025
Under-surface Li 4 Mn 5 O 12 spinel and 3 PO coated 1.13 Ni 0.30 0.57 2 is used for a Li-ion battery cathode. Uniform reconstruction underneath additional coating are successfully achieved via phosphoric acid treatment thermal treatment.
Language: Английский
Citations
1
Energy & Environmental Science, Journal Year: 2024, Volume and Issue: unknown
Published: Jan. 1, 2024
A versatile brine-quenching strategy implements a combined surface-bulk-compatible structure design to modulate the intrinsic redox properties of Li-rich layered oxides, ultimately achieving ultra-long lifetimes and negligible voltage decay.
Language: Английский
Citations
8
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 3, 2024
Abstract Aqueous zinc‐ion batteries (ZIBs) have gained significant attention owing to their high energy densities, low costs, and enhanced safety profiles. However, the development of suitable host materials (i.e., cathodes) with capacity, structural stability, rate performance remains challenging. Herein, a nanoflower‐like Ca 0.10 MnO 2 ·0.61H O (CaMnO) is successfully synthesized as high‐performance cathode material for ZIBs using simplified one‐step hydrothermal method. The unique 3D porous structure provides continuous conductive path abundant adsorption sites Zn 2+ ions mitigates aggregation during long‐term cycling processes. In addition, doping into interlayer has dual functional effect: 1) it acts pillar broaden spacing enhance crystal 2) induces formation oxygen vacancies reaction kinetics increase reversible capacity. Therefore, CaMnO exhibits specific capacity 289 mAh g −1 , excellent retention (90%) over 750 cycles at current 1.5 A . This study new perspective on advanced ZIBs.
Language: Английский
Citations
7
Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 471, P. 144744 - 144744
Published: July 13, 2023
Language: Английский
Citations
16