Yolk@shell structured SiOx/C@C has been constructed through a polydopamine sacrificial layer mediated strategy, and the SiOx/C@C displays high specific capacity and durable cyclability in lithium storage.
A green and effective strategy to prepare a novel lotus root-like three-dimensional (3D) bismuth/biomass derived activated carbon (Bi@BAC) composite was developed for simultaneous electrochemical sensing of Pb 2+ and Cd 2+ . The BAC supports herein were prepared from naturally-abundant Platanus seeds chemically activation by KOH, with dense and uniform bismuth micro/nanosized particles successfully anchored on the carbon substrate through microwave-assisted hydrothermal treatment and subsequent carbothermal reduction process. Simultaneous electrochemical detection of Pb 2+ and Cd 2+ using square wave anodic stripping voltammetry (SWASV) was performed with the novel composite modified carbon paste electrode (CPE). Under optimized experimental conditions, the Bi@BAC/CPE demonstrated good linear response for both two target metal ions in the concentration range of 0.5 to 50 μg L −1 , with limits of detection (LOD, S/N = 3) of 0.13 and 0.08 μg L −1 for Pb 2+ and Cd 2+ , respectively. Moreover, the modified electrode displayed high resistance to interference, long-term stability and good reproducibility. The Bi@BAC/CPE also demonstrated satisfactory recovery level for the detection of target metal ions in real water samples.
The interaction between lithium polysulfides and doped heteroatoms could prevent the loss of soluble polysulfides in the cathode and mitigate the shuttle effect in lithium-sulfur batteries. Herein, a facile synthesis of mesoporous graphene platelets (NSGs) with in situ nitrogen and sulfur doping by the pyrolysis of a self-assembled L-cysteine precursor on sodium chloride crystal surface for structuredirecting is presented. The mesoporous lamellar structure of the NSG possesses a uniform distribution of pyrrolic N, pyridinic N, and thiosulphate structured heteroatoms originating from in situ doping, which promotes the confinement of intermediate polysulfides. Combining the strong interactions with soluble polysulfide, flexible mesoporous architecture, and high conductivity of graphene, the prepared NSG material exhibited a high initial capacity of 1433 mA h g À1 at a 2C rate as well as a reversible capacity of 684 mA h g À1 after 200 cycles. This demonstrates that the in situ nitrogen and sulfur doped thin lamellar structure of graphene would be a promising cathode material for high performance lithium-sulfur batteries.
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