Heterojunction interfacial promotion of fast and prolonged alkali-ion storage of urchin-like Nb2O5@C nanospheres

2021 ◽  
Author(s):  
Zhipeng Zhao ◽  
Jingyun Cheng ◽  
Kai Li ◽  
Chuanqi Li ◽  
Shuo Zhang ◽  
...  
Keyword(s):  
Active Sites ◽  
Potassium Ion ◽  
Electronic Coupling ◽  
Electrochemical Performances ◽  
Ion Adsorption ◽  
Ion Diffusion ◽  
Sodium Potassium ◽  
Coupling Interaction ◽  
Ion Storage ◽  
Alkali Ion

The heterojunction interface presents strong electronic coupling interaction to boost the sodium/potassium ion diffusion and enrich the active sites for ion adsorption, which enables Nb2O5@C to achieve excellent electrochemical performances.

Ultrahigh-rate nickel monosulfide anodes for sodium/potassium-ion storage

Nanoscale ◽  
2021 ◽  
Author(s):  
Milan K. Sadan ◽  
Huihun Kim ◽  
Changhyeon Kim ◽  
Gyu-Bong Cho ◽  
Kwon-Koo Cho ◽  
...  
Keyword(s):  
High Power ◽  
Potassium Ion ◽  
Sodium Potassium ◽  
Full Cell ◽  
Ion Storage ◽  
Power And Energy ◽  
Alkali Ion

The NiS anode exhibited excellent rate and cycling characteristics for both alkali ion types (i.e., for SIBs and PIBs) in an ether-based electrolyte. Also, a full cell containing a Na3V2(PO4) cathode possessed high power and energy densities.

scholarly journals High Capacity and Fast Kinetics of Potassium-Ion Batteries Boosted by Nitrogen-Doped Mesoporous Carbon Spheres

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jiefeng Zheng ◽  
Yuanji Wu ◽  
Yong Tong ◽  
Xi Liu ◽  
Yingjuan Sun ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Active Sites ◽  
Carbon Materials ◽  
Potassium Ion ◽  
High Rate ◽  
Electrochemical Performances ◽  
Carbon Spheres ◽  
Fast Kinetics ◽  
Nitrogen Doped ◽  
Economic Price

AbstractIn view of rich potassium resources and their working potential, potassium-ion batteries (PIBs) are deemed as next generation rechargeable batteries. Owing to carbon materials with the preponderance of durability and economic price, they are widely employed in PIBs anode materials. Currently, porosity design and heteroatom doping as efficacious improvement strategies have been applied to the structural design of carbon materials to improve their electrochemical performances. Herein, nitrogen-doped mesoporous carbon spheres (MCS) are synthesized by a facile hard template method. The MCS demonstrate larger interlayer spacing in a short range, high specific surface area, abundant mesoporous structures and active sites, enhancing K-ion migration and diffusion. Furthermore, we screen out the pyrolysis temperature of 900 °C and the pore diameter of 7 nm as optimized conditions for MCS to improve performances. In detail, the optimized MCS-7-900 electrode achieves high rate capacity (107.9 mAh g−1 at 5000 mA g−1) and stably brings about 3600 cycles at 1000 mA g−1. According to electrochemical kinetic analysis, the capacitive-controlled effects play dominant roles in total storage mechanism. Additionally, the full-cell equipped MCS-7-900 as anode is successfully constructed to evaluate the practicality of MCS.

Few-Layered MoSe2 Nanosheets Confined in N,P-Doped Carbon Polyhedra for Sodium/Potassium-Ion Storage

2021 ◽  
Author(s):  
Yuyu Wang ◽  
Wenpei Kang ◽  
Xiaotong Wang ◽  
Bingbing Guo ◽  
Dongxu Cao ◽  
...  
Keyword(s):  
Potassium Ion ◽  
Sodium Potassium ◽  
Ion Storage

Encapsulating NiS nanocrystal into nitrogen-doped carbon framework for high performance sodium/potassium-ion storage

2020 ◽  
Vol 392 ◽  
pp. 123675 ◽  
Author(s):  
Xu Zhao ◽  
Feiyan Gong ◽  
Yundong Zhao ◽  
Bin Huang ◽  
Dong Qian ◽  
...  
Keyword(s):  
High Performance ◽  
Potassium Ion ◽  
Sodium Potassium ◽  
Nitrogen Doped ◽  
Carbon Framework ◽  
Ion Storage ◽  
Nitrogen Doped Carbon

Interlayer engineering of MoS2 nanosheets for high-rate potassium-ion storage

2020 ◽  
Vol 44 (47) ◽  
pp. 20659-20664
Author(s):  
Wei Kang ◽  
Yuchen Wang ◽  
Cuihua An
Keyword(s):  
Active Sites ◽  
Interlayer Spacing ◽  
Potassium Ion ◽  
High Rate ◽  
Rate Performance ◽  
Mos2 Nanosheets ◽  
Capacity Retention ◽  
Ion Storage

Se–MoS2 with expanded the interlayer spacing and more active sites, exhibits better rate performance (75% capacity retention) as potassium ion batteries anode.

Rational design heterostructured bimetallic selenides for high capacity and durability sodium/potassium-ion storage

2021 ◽  
pp. 133176
Author(s):  
Xiaofeng Liu ◽  
Zhulin Niu ◽  
Yanan Xu ◽  
Zhipeng Zhao ◽  
Chuanqi Li ◽  
...  
Keyword(s):  
Rational Design ◽  
High Capacity ◽  
Potassium Ion ◽  
Sodium Potassium ◽  
Ion Storage

Porous hard carbon spheres derived from biomass for high-performance sodium/potassium-ion batteries

2021 ◽  
Vol 33 (5) ◽  
pp. 055401
Author(s):  
Shuijiao Chen ◽  
Kejian Tang ◽  
Fei Song ◽  
Zhichao Liu ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Metal Ion ◽  
High Performance ◽  
Potassium Ion ◽  
Waste Biomass ◽  
Carbon Microspheres ◽  
Carbon Spheres ◽  
Hard Carbon ◽  
Sodium Potassium ◽  
Ion Storage

Abstract Hard carbon is the most attractive anode material for electrochemical sodium/potassium-ion storage. The preparation of hard carbon spheres directly from the broad sources of biomass is of great interest but barely reported. Herein, we developed a simple two-step hydrothermal method to construct porous carbon microspheres directly from the original waste biomass of camellia shells. The porous carbon microspheres have high specific capacities of 250 mAh g−1 and 264.5 mAh g−1 at a current density of 100 mA g−1 for sodium-ion batteries and potassium-ion batteries, respectively. And it has excellent cycle stability for sodium ions and potassium ions outperforming most reported hard carbons, which is mainly attributed to the microporous structure and spherical morphology. The work paves a way to prepare porous hard carbon spheres directly from biomass for alkali metal-ion batteries.

Synergistically enhanced sodium/potassium ion storage performance of SnSb alloy particles confined in three-dimensional carbon framework

Ionics ◽  
2020 ◽  
Vol 26 (10) ◽  
pp. 5019-5028
Author(s):  
Hanqing Zhao ◽  
Chenfei Zhuang ◽  
Junmin Xu ◽  
Zhuangfei Zhang ◽  
Weixia Shen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Potassium Ion ◽  
Sodium Potassium ◽  
Storage Performance ◽  
Alloy Particles ◽  
Carbon Framework ◽  
Ion Storage

scholarly journals Hollow CoP/FeP4 Heterostructural Nanorods Interwoven by CNT as a Highly Efficient Electrocatalyst for Oxygen Evolution Reactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1450
Author(s):  
Yanfang Liu ◽  
Yong Li ◽  
Qi Wu ◽  
Zhe Su ◽  
Bin Wang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Active Sites ◽  
High Performance ◽  
Hydrothermal Reaction ◽  
Clean Energy ◽  
Electrochemical Performances ◽  
Ion Diffusion ◽  
Kinetics Of

Electrolysis of water to produce hydrogen is crucial for developing sustainable clean energy and protecting the environment. However, because of the multi-electron transfer in the oxygen evolution reaction (OER) process, the kinetics of the reaction is seriously hindered. To address this issue, we designed and synthesized hollow CoP/FeP4 heterostructural nanorods interwoven by carbon nanotubes (CoP/FeP4@CNT) via a hydrothermal reaction and a phosphorization process. The CoP/FeP4@CNT hybrid catalyst delivers prominent OER electrochemical performances: it displays a substantially smaller Tafel slope of 48.0 mV dec−1 and a lower overpotential of 301 mV at 10 mA cm−2, compared with an RuO2 commercial catalyst; it also shows good stability over 20 h. The outstanding OER property is mainly attributed to the synergistic coupling between its unique CNT-interwoven hollow nanorod structure and the CoP/FeP4 heterojunction, which can not only guarantee high conductivity and rich active sites, but also greatly facilitate the electron transfer, ion diffusion, and O2 gas release and significantly enhance its electrocatalytic activity. This work offers a facile method to develop transition metal-based phosphide heterostructure electrocatalysts with a unique hierarchical nanostructure for high performance water oxidation.

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