Recent Advances in Developing High-Performance Anode for Potassium-Ion Batteries based on Nitrogen-Doped Carbon Materials.

Antimony nanoparticles encapsulated in interconnected nitrogen-doped carbon nanospheres for high performances PIBs

SnO2 nanosheets grow on sunflower shell carbon sphere used as anode material for high performance lithium-ion and potassium-ion batteries

Fe3C encapsulated in N-doped carbon as potassium ion battery anode with high capacity and long-term cycling performance

Potassium-ion batteries (PIBs) have broad application prospects in the field of electric energy storage systems because of its abundant K reserves, and similar "rocking chair" operating principle as lithium-ion batteries (LIBs). Aiming to the large volume expansion and sluggish dynamic behavior of anode materials for storing large sized K-ion, bismuth telluride (Bi2 Te3 ) nanoplates hierarchically encapsulated by reduced graphene oxide (rGO), and nitrogen-doped carbon (NC) are constructed as anodes for PIBs. The resultant Bi2 Te3 @rGO@NC architecture features robust chemical bond of Bi─O─C, tightly physicochemical confinement effect, typical conductor property, and enhanced K-ion adsorption ability, thereby producing superior electrochemical kinetics and outstanding morphological and structural stability. It is visually elucidated via high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that conversion-alloying dual-mechanism plays a significant role in K-ion storage, allowing 12 K-ion transport per formular unit employing Bi as redox site. Thus, the high first reversible specific capacity of 322.70mAhg-1 at 50mAg-1 , great rate capability and cyclic stability can be achieved for Bi2 Te3 @rGO@NC. This work lays the foundation for an in-depth understanding of conversion-alloying mechanism in potassium-ion storage.

Novel NASICON-type Mn0.5Ti2(PO4)3@F-doped carbon composite with high electrochemical performance as anode materials for potassium-ion batteries

Effects of sulfide on microbial fuel cells with platinum and nitrogen-doped carbon powder cathodes

Novel highly utilized PdNi bimetallic-loaded N-doped carbon catalysts prepared from MOF for Suzuki coupling reaction and hydro reduction of nitroaromatics

In-situ synthesis of antimony nanoparticles encapsulated in nitrogen-doped porous carbon framework as high performance anode material for potassium-ion batteries

Developing efficient and affordable electrocatalysts for oxygen reduction reaction (ORR) is very important for next-generation energy conversion and storage devices. Herein, N-doped carbon materials with high N-doping level (5.02 at%) and hierarchically porous structure (H-NHPC) were fabricated by pyrolysis of inexpensive beancurd soaked with urea and NaCl, which was employed as an extra nitrogen resource and a green template to control the morphology and porosity, respectively. The as-prepared H-NHPC exhibited better ORR catalytic activity than the benchmark Pt/C electrocatalysts and most of other biomass-driven nitrogen-doped carbon materials in alkaline medium. The excellent catalytic activity of H-NHPC was attributed to its high content of catalytic active species such as pyridinic-N and graphitic-N, large surface area (988.2 m2 g−1) and abundant porosity ranging from micro- to meso- and macro-scale for efficient mass transfer. Furthermore, the Zn-air battery (ZAB) assembled with H-NHPC as the air electrode displayed higher power-density, larger specific-capacity and better rate-capability than the Pt/C-based ZAB, showing great application perspective in metal-air batteries.

Ultra-small few-layered MoSe2 nanosheets encapsulated in nitrogen-doped porous carbon nanofibers to create large heterointerfaces for enhanced potassium-ion storage

Bismuth (Bi) is a promising anode material for potassium-ion batteries due to its high energy density. However, the large volume change limits its applications. Herein, N-doped carbon coated Bi nanorods with a hollow structure are fabricated and they exhibit excellent long-term cycling performance (88% capacity retention over 1000 cycles) and high-rate ability (297 mA h g-1 at 20C, 94% capacity of that at 1C). Furthermore, the mechanism was expounded by in situ XRD, indicating a multi-phase reaction for the initial discharge process and three two-phase reactions for the subsequent charge/discharge processes.

Supercritical CO2 foaming strategy to fabricate nitrogen/oxygen co-doped bi-continuous nanoporous carbon scaffold for high-performance potassium-ion storage

Self-templated anchor of FeS2 nanoparticles on porous carbon matrix as highly reversible K-storage anode

This article reports a strategy to use nitrogen-doped carbon materials as electrodes for supercapacitors. Depending on the carbon precursor, the porous structure is changed with specific surface area reached up to 2270 m2 g−1. The capacitance of carbon materials used as electrodes is related strictly to pore size. The microstructure and nitrogen functionalities enable a high capacitance (327 F g−1) and cycle durability. The nanoporous carbon electrode exhibits long-term cycle life and high cycle stability with a retention of 86% of its initial after 10,000 cycles in neutral electrolyte. Highly porous carbons are thus considered a promising material for supercapacitors.

N-doped three-dimensional porous carbon materials derived from bagasse biomass as an anode material for K-ion batteries