Nowadays, supercapacitors have been received widespread interests because of large specific capacitance, excellent cycle life, high power density and energy density, and wide operating temperature range. Electrode materials as an...

Progress of layered double hydroxides-based materials for supercapacitors

Supercapacitors have attracted extensive attention due to their advantages of high energy density, low cost and long cycle life. However, the key to affect the performance of supercapacitors lies in the electrode materials. The layered bimetallic hydroxides (LDHs), transition metal sulfides (TMSs), transition metal phosphides (TMPs) and transition metal oxides (TMOs) dominated by Ni and Mn elements have good electrochemical performance when they are used as electrode materials. The preparation methods of NiMn-based electrode materials, including hydrothermal method, electrodeposition method, sol-gel method, metal-organic frameworks (MOFs) derivation method, coprecipitation method, electrospinning method and so on, are reviewed in this paper. The carbon material modification of NiMn-based electrode materials is introduced from aspects such as graphene and its derivatives, carbon nanotubes, activated carbon, and biomass derived carbon. At the same time, the structure control strategies of NiMn-based composites are introduced, and the design strategies of two-dimensional and three-dimensional materials are systematically discussed, such as layer structure, heterostructure, Nano-flower structure, core-shell structure, etc. In particular, the research progress of NiMn-based electrode materials for asymmetric supercapacitors is introduced in detail, and their electrochemical properties in different applications are discussed. Finally, the current challenges and future development directions of NiMn-based electrode materials are discussed. 

Rational design of NiMn-based electrode materials for high-performance supercapacitors

• Porous MXene@nitrogen-doped carbon composite (MC) film was obtained. • Nitrogen doping improves the electrochemical performance of MC. • The porous network increases the ion transport rate and the sensitivity to strain. • The assembled symmetric and zinc-ion hybrid supercapacitors display excellent performance. • The MC film based sensor shows high sensitivity and long durability. A simple strategy is proposed to fabricate MXene@nitrogen-doped carbon (MC) composite film by vacuum filtration followed by annealing. PDA nanospheres serve as spacers, carbon precursor, and nitrogen sources, and meanwhile endow MC with porous networks. Nitrogen doping improves the electrochemical performance of MC, while the porous network increases the ion transport rate and the sensitivity to strain. When assembled into a symmetrical supercapacitor, the device delivers a high energy density of 23.2 μWh·cm -2 at a power density of 317.7 μW·cm -2 . The assembled all-solid-state zinc-ion hybrid supercapacitor delivers a much higher energy density of 61.24 μWh·cm -2 at a power density of 352.76 μW·cm -2 . The MC-based wearable sensor exhibits a sensitivity of 0.21 kPa -1 at a pressure range of 0-2 kPa for piezoresistive sensing with a superior durability over 2000 cycles. This multifunctional MC composite film has promising potentials for the fabrication of energy storage devices and wearable electronics. 

MXene@nitrogen-doped carbon films for supercapacitor and piezoresistive sensing applications

Titanium nitride (TiN), a prominent transition metal nitride (TMN), has garnered significant attention for its exceptional characteristics and versatile applications in modern technologies. This comprehensive review highlights TiN's unique properties,...

Titanium Nitride (TiN) as a Promising Alternative to Plasmonic Metals: A Comprehensive Review of Synthesis and Applications

Boosting ultrafast and durable sodium storage of hard carbon electrode with graphite nanoribbons

Two-dimensional ordered superstructures have been attracting considerable attention due to their interesting properties and potential applications. However, designing ideal functional superstructures with excellent electrochemical properties is still a major challenge, and an in-depth understanding of the structure-activity relationship of electrodes remains to be achieved. To elucidate this critical issue, herein, we rationally designed and synthesized for the first time superstructured TiO2/dual-doped mesoporous carbon anodes using confined space and surface coassembly strategies. Our method primarily relied on the larger interlayer space few-layered MXene and its negatively charged surface, allowing hexamethylenetetramine intercalation and surface electrostatic adsorption. The superstructured TiO2/dual-doped mesoporous carbon was successfully assembled by the thermal decomposition of a confined carbon precursor. Subsequently, the comparison of Na+-storage properties of various anodes was carried out based on the results of structural characterization techniques and electrochemical analysis methods. The results showed that the optimized anode (N/O-C@TiO2-20) can deliver a reversible capacity of 165 mA h g-1 after 1000 cycles at a current density of 1 A g-1, indicating excellent electrochemical properties. The enhancement can be attributed to the synergistic effect of carbon domains, defective nanocrystals, and a covalently coupled interface between TiO2 and mesoporous carbon. Our work not only offered a new strategy for the assembly and regulation of superstructures to promote the electrochemical performance but also enlightened the rational design of advanced anodes for sodium-ion battery application.

Superstructured Nanocrystals/Dual-Doped Mesoporous Carbon Anodes for High-Performance Sodium-Ion Batteries.

An effective strategy to enhance the sulfur resistance of Ce-based catalyst for low temperature SCR reaction

The search for new electrode materials for sodium-ion batteries (SIBs), especially for enhancing the specific capacity and cycling stability of anodes, is of great significance for the development of new energy conversion and storage materials. Here, a new type of titanium nitride composite anode (TiN@C) coated with 2D carbon nanosheets was prepared for the first time using a rationally designed topochemical conversion approach of interface-confinement. Subsequently, the electrochemical performance and Na+ storage mechanism of TiN@C as an anode for SIBs was investigated. The quantum-dot-sized TiN anodes exhibited shorter ionic transport pathways, while the 2D ultrathin carbon nanosheets reinforced the structural stability of the composite and provided a high electron transformation rate. As a result, the TiN/C composite anode can deliver a high reversible capacity of 170 mA h g-1 and 149 mA h g-1 after 5000 cycles at a current density of 0.5 A g-1 and 1 A g-1, indicating excellent electrochemical properties. This work provides new opportunities to explore the convenient and controllable preparation of metal nitride anodes for other energy conversion and storage applications.

Titanium nitride as a promising sodium-ion battery anode: interface-confined preparation and electrochemical investigation.

In this work, two ordered mesoporous catalysts with different confined structures were successfully constructure for the catalytic combustion of propane. Notably, the framework-confined Pt/Ti0.1AlOy-EISA catalysts were prepared by a one-step...

Design ordered mesoporous confinement Pt/Ti0.1AlOy catalysts for the propane catalytic combustion

g-C3N4 promoted NiFe-LDH self-assemble high performance supercapacitor composites

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