Owing to promising applications in aircraft, military field and submarine etc., lithium-sulfur (Li-S) batteries with high energy density (2500 Wh·kg-1) are emerging as the next-generation energy storage system at low...
A capacitive immunosensor on a glassy carbon electrode (GCE) was fabricated successfully by using an insulating poly (o-phenylenediamine) (OPD) film. Two methods, covalently coupling and copolymerization, were developed to immobilize the antitransferrin onto the GCE for sensitively probing transferrin. The capacitance change of the electrode caused by the interaction between antigen -antibody was monitored by the potentiostatic step. The immunosensors demonstrated a highly specific response to transferrin in a sample solution. The stable insulating property 2283
The anode-cathode interplay is an important but rarely considered factor that initiates the degradation of aqueous zinc ion batteries (AZIBs). Herein, to address the limited cyclability issue of V-based AZIBs, Al 2 (SO 4 ) 3 is proposed as decent electrolyte additive to manipulate OH À -mediated cross-communication between Zn anode and NaV 3 O 8 • 1.5H 2 O (NVO) cathode. The hydrolysis of Al 3 + creates a pH � 0.9 strong acidic environment, which unexpectedly prolongs the anode lifespan from 200 to 1000 h. Such impressive improvement is assigned to the alleviation of interfacial OH À accumulation by Al 3 + adsorption and solid electrolyte interphase formation. Accordingly, the strongly acidified electrolyte, associated with the sedated crossover of anodic OH À toward NVO, remarkably mitigate its undesired dissolution and phase transition. The interrupted OH À -mediated communication between the two electrodes endows Zn j j NVO batteries with superb cycling stability, at both low and high scan rates.
Having the benefit of low cost, excellent stability and tolerance to extreme conditions, nanozymes are a potential alternative of horseradish peroxidase (HRP) or the other enzymes for bioanalytical chemistry, especially...
Metal phosphorus trichalcogenides
have been regarded as promising
high-capacity anode materials for sodium-ion batteries (SIBs) owing
to their high reversible capacity. Nevertheless, their practical application
is plagued by poor diffusion kinetics and dramatic volume fluctuations
during the charge–discharge process, resulting in no satisfactory
rate and life span so far. Herein, we propose a space-confinement
strategy to remarkably promote the cycling stability and rate capacity
by embedding FePS3 particles in the interlayer of expanded
graphite (EG), which are derived from in situ transformation
of graphite intercalation compounds. The layered EG not only greatly
alleviates the volume fluctuations of FePS3 by the space
confinement effect so as to maintain the stability of the electrode
microstructure, but it also ensures rapid Na+ and electron
transfer during cycling. When acting as an anode for SIBs, the hybrid
electrode delivers a highly reversible capacity of 312.5 mAh g–1 at an ultrahigh rate of 50 A g–1 while retaining an ultralong life span of 1300 cycles with a retention
of 82.4% at 10 A g–1. Moreover, the excellent performance
of the assembled full battery indicates the practical application
potential of FPS/EG.
Sodium-ion batteries (SIBs) have become an important
supplementation
to lithium-ion batteries. Unfortunately, the low capacity and inferior
low-temperature performance of traditional hard carbon led to limited
energy density and a range of applications of SIBs. Herein, we present
high-performance SIBs via embedding FePS3 in graphitized
porous N-doped carbon (FPS/GPNC) using coordination polymerization
reaction. Such unique graphitized pores are in situ-constructed by
the self-aggregation of Fe nanoparticles with high surface energy
at high temperatures, which affords a three-dimensional open channel
and a graphitized conductive network for fast transportation of Na+ and electrons. Moreover, an ingenious buffer barrier composed
of graphitized pores is constructed for FePS3 to withstand
volume fluctuation during cycling. Consequently, a superior capacity
of 354.2 mAh g–1 is delivered even when the rate
increases to 50 A g–1. The impressing cycling lifespan
up to 4700 cycles is achieved at 30 A g–1 with excellent
retention of 84.4%. Interestingly, the low-temperature performance
(−20 °C) of FePS3 is explored for the first
time, and excellent stability (502.6 mAh g–1 maintained
after 100 cycles at 0.1 A g–1) is obtained, indicating
huge potential of practical application. This work provides insights
into designing high-rate, high-capacity, and low-temperature SIBs.
Fast charging is considered to be a mainstream development of the rechargeable batteries with the exploitation of electric vehicles markets and portable electronics. Nevertheless, the limited range and long fully...
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