FeP/C Composites as an Anode Material for K-Ion Batteries

Abstract

Owing to their natural abundance, the low potential, and the low cost of potassium, potassium-ion batteries are regarded as one of the alternatives to lithium-ion batteries. In this work, we successfully fabricated a FeP/C composite, a novel electrode material for PIBs, through a simple and productive high-energy ball-milling method. The electrode delivers a reversible capacity of 288.9 mA•h•g −1 (2nd) at a discharge rate of 50 mA g −1 , which can meet the future energy storage requirements. Density functional theory calculations suggest a lower diffusion barrier energy of K + than Na + , which allows faster K + diffusion in FeP.

A Room‐Temperature Molten Hydrate Electrolyte for Rechargeable Zinc–Air Batteries

“…Although Zn deposition/dissolution reaction is as important as ORR/OER performance in determining the overall properties of a battery, only few attempts to ameliorate the anode reversibility were demonstrated. The strategy includes (i) the use of neutral/acidic aqueous electrolytes to avoid the carbonization of electrolytes and reduce dendrite, (ii) surface modification of Zn electrode with the aims to prevent passivation or homogenize current distribution, and (iii) a combination of them . Recently, a pioneering work by Xu and Wang groups reported a nearly 100% Coulombic efficiency of Zn deposition/dissolution employing a superconcentrated, so‐called “water‐in‐salt” electrolytes, in which the unique solvation structure of Zn 2+ contributed to the remarkable Zn reversibility .…”

“…Recently, a pioneering work by Xu and Wang groups reported a nearly 100% Coulombic efficiency of Zn deposition/dissolution employing a superconcentrated, so‐called “water‐in‐salt” electrolytes, in which the unique solvation structure of Zn 2+ contributed to the remarkable Zn reversibility . However, typical Zn salts required for these studies are trifluoromethanesulfonate (TfO) or bis(trifluoromethanesulfonyl)amide (TFSA) . These organic fluorinated salts are costly, which makes their practical application challenging and inevitably lessens the economic benefits anticipated for Zn‐based batteries .…”

Fabrication and Evaluation of Multi‐Walled Carbon Nanotubes Supported Novel Catalyst for Select Conversion of Cellulose to 5‐Hydroxymethylfurfural

“…In addition to pyridine-IR results that showed evidence for Brønsted and Lewis sites in the as-prepared catalysts, NH 3 -TPD and CO 2 -TPD methods were employed to calculate the acid and base sites strength of pristine CNTs, and the obtained CNTsÀ SO 3 H, CNTsÀ SO 3 HÀ NH 2 and CNTsÀ SO 3 HÀ NH 2 À Cr III catalysts, respectively. As the catalysts supporter of CNTs was proven to possess excellent thermo stability, [32] carbon dioxide and ammonia temperature-programmed desorption tests were performed at a linear heating rate of 10°C min À 1 up to the temperature of 800°C. Corresponding desorption peaks of NH 3 -TPD and CO 2 -TPD were shown in Figure 8, and the peaks were integrated to calculate acid and base strength of CNTs supported catalysts.…”

Complimentary effects of annealing temperature on optimal tuning of functionalized carbon–V2O5 hybrid nanobelts for targeted dual applications in electrochromic and supercapacitor devices

“…9,10 However, practical applications of V 2 O 5 -based electrode materials for supercapacitor and electrochromic devices are hampered by the low electrical and ionic conductivity, slow lithium ion diffusion, and poor structural stability of V 2 O 5 . [11][12][13] To improve the Li-ion intercalation kinetics in V 2 O 5 layers, the most common approach is forming hybrids using various carbon nanostructures or electronically conductive polymers. [14][15][16] A combination of carbon allotropes and their derivatives with different nanostructures of V 2 O 5 can signicantly improve the surface area as well as the conductivity of the composite.…”