Rapid mass production of two-dimensional metal oxides and hydroxides via the molten salts method

Hu, Zhimi; Xu, Xiao; Jin, Huanyu; Li, Tianqi; Chen, Ming; Liang, Zhun; Guo, Zhengfeng; Li, Jia; Wan, Jun; Huang, Liang; Zhang, Yanrong; Feng, Guang; Zhou, Jun

doi:10.1038/ncomms15630

Cited by 266 publications

(169 citation statements)

References 50 publications

Supporting

Mentioning

165

Contrasting

Order By: Relevance

“…Hasegawa, et al. suggest the possible occurrence of (de)intercalation processes of those cations, similar to the charge storage mechanisms of MnO2 ,. The specific capacitances in aqueous electrolytes are consistent with a previous TiN study (e. g. H 2 SO 4 > KOH > Na 2 SO 4 ) .…”

Section: Resultssupporting

confidence: 86%

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

Zheng

Tahmasebi

et al. 2018

ChemElectroChem

View full text Add to dashboard Cite

Electrochemical capacitors (ECs) with high‐power capabilities and stable cycling can effectively improve the state of the art in power delivery and energy storage. In this study, we investigate reactively sputtered titanium nitride (TiN) electrodes on three‐dimensional (3D) substrates with various electrolytes and high‐rate cycling conditions. The electrode exhibits cycling stability with negligible capacitance fading after 5 000 cycles and a great rate capability, allowing the (dis)charge rate to extend from 0.1 to 10 V s−1 and retaining nearly 50 % of the capacitance in a three‐electrode system. A symmetric device made with such electrodes is capable of working at a scan rate up to 100 V s−1, yielding a remarkable power density of 4.81×105 W kg−1 at 1.60 Wh kg−1. The energy density can be pushed to 168.03 Wh kg−1 at 4.03×104 W kg−1 by replacing the aqueous electrolyte with an organic one, and this can likely be further increased by electrolyte optimization. The material synthesis and device processing suggest that 3D TiN structures can enable a new class of high‐power ECs with enhanced stability compared to their carbon‐ and pseudo‐ counterparts.

show abstract

Section: Resultssupporting

confidence: 86%

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

Zheng

Tahmasebi

et al. 2018

ChemElectroChem

View full text Add to dashboard Cite

show abstract

“…To gain insightful understanding of NRR mechanism, it is necessary to design TMNs with simplex structure and stable surface vacancies for the linkage of theoretical models and real‐world catalysts. 2D material has onefold and fully exposed crystal surface, which is widely used as platform for both theoretical calculations and practical applications in electrocatalysis . In the meantime, many works have shown that 2D materials have surface distortion, which can endow 2D materials and their vacancies with excellent structural stability .…”

Section: Exafs Curve‐fitting Results (Error Bounds (Accuracies) Were mentioning

confidence: 99%

Nitrogen Vacancies on 2D Layered W₂N₃: A Stable and Efficient Active Site for Nitrogen Reduction Reaction

et al. 2019

Self Cite

View full text Add to dashboard Cite

also aggravate the greenhouse effect. [8] Considering the huge energy consumption of this process and the great potential of NH 3 in future energy systems, protonassisted electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions is becoming increasingly important in realizing low-cost artificial nitrogen fixation. [10][11][12] More importantly, the NRR system can be easily integrated with renewable solar and wind energy into an environmentally benign process for NH 3 production. [2,7] Even though various materials have shown NRR activity in aqueous system, their performance are still hindered by the sluggish reaction kinetics and competitive hydrogen evolution reaction (HER) resulting in poor activity and unsatisfactory selectivity. [13][14][15] The active site for electrochemical NRR needs twofold properties: for one thing, it can accept the lone-pair electrons for effective N 2 adsorption and for the other thing it can donate electrons to antibonding orbitals of dinitrogen molecules for the NN triple-bond activation. [9,13,[16][17][18][19][20] From this perspective, vacancy-engineering materials are ideal for practical applications. [9,16,20] By virtue of the electron redistribution and special chemical properties, the vacancies can provide unique active sites for nitrogen adsorption and activation. [9,[21][22][23][24] Up to now, the most common vacancy that has been studied for NRR is oxygen vacancy. For example, oxygen vacancies on transition metal oxides are active for NRR by enhancing the dinitrogen molecule adsorption. [9,25] However, oxygen vacancy can also improve the HER performance of the host matrix, which may result in poor NRR selectivity. [26][27][28] Alternatively, nitrogen vacancies on transition metal nitride (TMN) are considered as an ideal active site for NRR because of its unique vacancy properties for dinitrogen molecule adsorption and poor HER activity. [29,30] However, the nitrogen vacancy on TMN would be deactivated during NRR process thus results in poor stability. [29] In addition, researchers claim that some TMNs are inactive toward NRR in aqueous system, which is in contrary to theoretical calculations. [31] To gain insightful understanding of NRR mechanism, it is necessary to design TMNs with simplex structure and stable surface vacancies for the linkage of theoretical models and real-world catalysts. 2D material has onefold and fully exposed crystal surface, which is widely used as platform for both theoretical calculations and Electrochemical nitrogen reduction reaction (NRR) under ambient conditions provides an avenue to produce carbon-free hydrogen carriers. However, the selectivity and activity of NRR are still hindered by the sluggish reaction kinetics. Nitrogen Vacancies on transition metal nitrides are considered as one of the most ideal active sites for NRR by virtue of their unique vacancy properties such as appropriate adsorption energy to dinitrogen molecule. However, their catalytic performance is usually limited by the unstable feature. Herein, a new ...

show abstract

“…2D nanomaterials have aroused great interest in both fundamental research and technological applications because of their exceptional physical and chemical properties, distinguishing them from their bulk counterparts, 0D and 1D nanoarchitectures . Over the last decade, an increasing number of 2D materials, including graphene, transition metal dichacolgenides, transition metal oxides, MXenes, etc., have been extensively employed as promising candidates for photocatalysis, electrocatalysis, energy storage and conversion, especially for the next‐generation rechargeable lithium‐ion batteries (LIBs) .…”

Section: Introductionmentioning

confidence: 99%

Scalable 2D Mesoporous Silicon Nanosheets for High‐Performance Lithium‐Ion Battery Anode

Song

Chen

et al. 2018

Small

121

View full text Add to dashboard Cite

Constructing unique mesoporous 2D Si nanostructures to shorten the lithium-ion diffusion pathway, facilitate interfacial charge transfer, and enlarge the electrode-electrolyte interface offers exciting opportunities in future high-performance lithium-ion batteries. However, simultaneous realization of 2D and mesoporous structures for Si material is quite difficult due to its non-van der Waals structure. Here, the coexistence of both mesoporous and 2D ultrathin nanosheets in the Si anodes and considerably high surface area (381.6 m g ) are successfully achieved by a scalable and cost-efficient method. After being encapsulated with the homogeneous carbon layer, the Si/C nanocomposite anodes achieve outstanding reversible capacity, high cycle stability, and excellent rate capability. In particular, the reversible capacity reaches 1072.2 mA h g at 4 A g even after 500 cycles. The obvious enhancements can be attributed to the synergistic effect between the unique 2D mesoporous nanostructure and carbon capsulation. Furthermore, full-cell evaluations indicate that the unique Si/C nanostructures have a great potential in the next-generation lithium-ion battery. These findings not only greatly improve the electrochemical performances of Si anode, but also shine some light on designing the unique nanomaterials for various energy devices.

show abstract

Rapid mass production of two-dimensional metal oxides and hydroxides via the molten salts method

Cited by 266 publications

References 50 publications

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

Nitrogen Vacancies on 2D Layered W₂N₃: A Stable and Efficient Active Site for Nitrogen Reduction Reaction

Scalable 2D Mesoporous Silicon Nanosheets for High‐Performance Lithium‐Ion Battery Anode

Contact Info

Product

Resources

About

Rapid mass production of two-dimensional metal oxides and hydroxides via the molten salts method

Cited by 266 publications

References 50 publications

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

Nitrogen Vacancies on 2D Layered W2N3: A Stable and Efficient Active Site for Nitrogen Reduction Reaction

Scalable 2D Mesoporous Silicon Nanosheets for High‐Performance Lithium‐Ion Battery Anode

Contact Info

Product

Resources

About

Nitrogen Vacancies on 2D Layered W₂N₃: A Stable and Efficient Active Site for Nitrogen Reduction Reaction