Defect-rich and ultrathin N doped carbon nanosheets as advanced trifunctional metal-free electrocatalysts for the ORR, OER and HER

NiMoS4 nanocrystals anchored on N-doped carbon nanosheets as anode for high performance lithium ion batteries

High nitrogen-doped carbon nanosheets for electrochemical sensing of malachite green

Fe2O3/spinel NiFe2O4 heterojunctions in-situ wrapped by one-dimensional porous carbon nanofibers for boosting oxygen evolution/reduction reactions

Herein, a highly stable, porous, multifunctional and metal-free catalyst was developed, which exhibited significant catalytic performance in the oxidation of amines and the transfer hydrogenation of nitriles under mild conditions.

In this study, a novel cathode material comprising VO2/V2O3/V6O13@nitrogen-doped carbon nanosheets (denoted as VO2/V2O3/V6O13@N-C) with abundant oxygen vacancies was synthesised for aqueous zinc-ion batteries (AZIBs). The synthesis was achieved via a self-sacrificial route utilising an organic-inorganic hybrid layered vanadate precursor, [(CH3)2NH2]V3O7. The presence of oxygen vacancies and multiple heterostructures within the cathode facilitates the diffusion of Zn2+ ions and provides additional active sites for electrochemical reactions. Furthermore, the nanosheet morphology and the nitrogen-doped carbon coating synergistically enhance the electronic conductivity of the cathode. Notably, during the charging and discharging processes, an opposing lattice expansion phenomenon (i.e., positive versus negative expansion) occurs between the VO2/V2O3 and V6O13 phases, leading to an "expansion counteraction" effect that effectively mitigates volumetric changes in the VO2/V2O3/V6O13@N-C cathode. Consequently, the VO2/V2O3/V6O13@N-C cathode exhibits outstanding rate performance and cycling stability. Specifically, the discharge capacity reaches 290.1 mA h g-1, with a remarkable capacity retention rate of 95.6% after 250 cycles at a current density of 0.2 A g-1. Furthermore, at a high current density of 5 A g-1, the cathode achieves a maximum discharge capacity of 198.2 mA h g-1 and retains 86.5% of maximum capacity after 2000 cycles. This study not only proves that calcination of organic-inorganic hybrid layered vanadate is a promising approach for synthesizing high-performance vanadium oxide cathodes, but also presents the "expansion counteraction" strategy to tackle the issue of volume changes for vanadium oxide cathodes.

Constructing high-efficient, low-cost and robust oxygen electrocatalysts toward rechargeable Zn–air batteries remains a big challenge. Herein, metallic Ni3Fe alloy nanoparticles encapsulated in 3D porous N-doped graphene aerogel was prepared through a facile hydrothermal assembly and calcination process. Inspired by the unique configuration and strong electronic interactions between Ni3Fe and N-doped graphene, Ni3Fe-GA1 exhibited outstanding activity and stability for OER, ORR, and Zn–air batteries. More information can be found in the Full Paper by L. Xu, L. Mai, et al. on page 4044.

Integrating PtCo nanoparticles on N, S doped pore carbon nanosheets as high-performance bifunctional catalysts for oxygen reduction and hydrogen evolution reactions

Designing high-performance trifunctional electrocatalysts for ORR/OER/HER with outstanding activity and stability for each reaction is quite significant yet challenging for renewable energy technologies. Herein, a highly efficient and durable trifunctional electrocatalyst RuCoOx is prepared by a unique one-pot glucose-blowing approach. Remarkably, RuCoOx catalyst exhibits a small potential difference (ΔE) of 0.65 V and low HER overpotential of 37 mV (10 mA cm-2), as well as a negligible decay of overpotential after 200 000/10 000/10 000 CV cycles for ORR/OER/HER, all of which show overwhelming superiorities among the advanced trifunctional electrocatalysts. When used in liquid rechargeable Zn-air batteries and water splitting electrolyzer, RuCoOx exhibits high efficiency and outstanding durability even at quite large current density. Such excellent performance can be attributed to the rational combination of targeted ORR/OER/HER active sites into one electrocatalyst based on the double-phase coupling strategy, which induces sufficient electronic structure modulation and synergistic effect for enhanced trifunctional properties.

Salt–template assisted fabrication of Co3O4 nanodots anchored into 2D N–doped carbon nanosheets as an advanced anode for lithium–ion batteries

Defect-rich carbon nanosheets promoting power density of lithium-ion capacitors in redox electrolyte system

Electron accumulation enables Bi efficient CO2 reduction for formate production to boost clean Zn-CO2 batteries

Superhydrophobic Co/Fe sulfide nanoparticles and single-atoms doped carbon nanosheets composite air cathode for high-performance zinc-air batteries

A self-sacrificed template synthesis of porous N doped carbon nanosheets and their electrochemical properties

N, P codoped carbon nanosheets derived from rice husk for supercapacitors with high energy density

Isolated Pt atoms on N-doped carbon nanosheets exhibit excellent bifunctional catalytic performance towards the hydrogen evolution/oxidation reaction (HER/HOR).