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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >K-doped FeOOH/Fe3O4 nanoparticles grown on a stainless steel substrate with superior and increasing specific capacity
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K-doped FeOOH/Fe3O4 nanoparticles grown on a stainless steel substrate with superior and increasing specific capacity

机译：K掺杂的FeOOH / Fe3O4纳米颗粒在不锈钢基板上生长，具有优异的和增加的特定容量

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摘要

K-doped FeOOH/Fe3O4 nanoparticles with a size of 100 nm were grown on stainless steel (SS) hydrothermally. The effect of the synthetic conditions on compositions, morphologies and electrochemical performances was discussed, and the possible synthetic mechanism was proposed. The obtained K-doped FeOOH/Fe3O4/SS demonstrated a superior specific capacity of 396 mA h g(-1) (0.554 mA h cm(-2)) at 1 A g(-1) in 2 M KOH, which is the largest value reported so far. And it was also much larger than those of K-doped and -undoped FeOOH/SS samples. Furthermore the sample manifested an increasing capacity during the cycling test, which was probably associated with the doping of K+ as well as the coexistence of Fe(ii) and Fe(iii) in the structure. Based on density functional theory (DFT), the effect of the K-doping on the electron conductivity of the sample was theoretically investigated. In addition, a Co-Mo-O/Ni3S2/Ni foam (NF)//K-doped FeOOH/Fe3O4/SS asymmetric supercapacitor was fabricated, which can deliver a high energy density of 74.38 W h kg(-1) at a power density of 3.64 W kg(-1).
机译：尺寸为100nm的K掺杂的FeOOH / Fe3O4纳米颗粒在不锈钢（SS）上生长。讨论了合成条件对组合物，形态和电化学性能的影响，提出了可能的合成机制。所获得的K掺杂的FeOh / Fe 3 O 4 / S表示，在2M KOH中，在2M KOH中的1A-G（-1）的优异比例为396 mA Hg（-1）（0.554mA Hcm（-2）），这是最大的迄今为止报告的价值。它也比K掺杂的和oondopedFOOH / SS样品大得多。此外，样品在循环试验期间表现出增加的容量，其可能与k +的掺杂以及结构中Fe（ii）和Fe（III）的共存相关。基于密度函数理论（DFT），理论上研究了K掺杂对样品电子电导率的影响。此外，制备了CO-MO-O / NI3S2 / NI泡沫（NF）// K掺杂的FEOH / FE3O4 / SS不对称超级电容器，可以在a下提供74.38WH kg（-1）的高能量密度功率密度为3.64 W kg（-1）。

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