Chemical preintercalation synthesis approach for the formation of new layered tungsten oxides

Chemical preintercalation synthesis approach for the formation of new layered tungsten oxides
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用于形成新型层状氧化钨的化学预插层合成方法

DOI:
10.1007/s10853-022-07190-z
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发表时间:
2022
影响因子:
4.5
通讯作者:
Pomerantseva, Ekaterina
Pomerantseva, Ekaterina
中科院分区:
材料科学3区
文献类型:
--
作者:
Clites, Mallory;Blickley, Adam;Cullen, David A.;Pomerantseva, Ekaterina

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氧化钨,WO 3·nH 2 O,是一种独特的层状氧化物材料,在电致变色和储能应用中提供增强的性能。在这里,我们报告了一个新的,以前从未合成,含钠层状氧化钨相,Na0.20WO3·0.81H2O,使用化学预插层方法的形成。通过显微镜、光谱和衍射方法研究了这种新相的结构和组成。Na0.20WO3·0.81H2O电极在H2SO 4水溶液电池中的电化学循环显示初始放电容量为37.43 mAh g-1、480.8 mAh g-1和253.2 mAh g-1(电位窗口为− 0.2-0.8 V vs. Ag/AgCl),非水锂离子电池(相对于Li/Li+的电位窗口为0.1-4.0 V)和非水Na离子电池(相对于Na/Na+的电位窗口为0.1-4.0 V)。此外,当将Na0.20WO3·0.81H2O样品置于1000 psi或更高的压力下时,观察到从浅黄色到深棕色/黑色的可逆的压力诱导颜色变化。我们的研究结果证明了化学预插层合成方法的可行性,以产生具有有趣功能特性的新氧化物相。图形摘要
Tungsten oxide, WO3·nH2O, is a unique layered oxide material that offers enhanced performance in electrochromic and energy storage applications. Herein, we report the formation of a new, never previously synthesized, Na-containing layered tungsten oxide phase, Na0.20WO3·0.81H2O, using a chemical preintercalation approach. The structure and composition of this novel phase were investigated via microscopy, spectroscopy, and diffraction methods. Electrochemical cycling of Na0.20WO3·0.81H2O electrodes revealed initial discharge capacities of 37.43 mAh g−1, 480.8 mAh g−1, and 253.2 mAh g−1in aqueous H2SO4cells (potential window of − 0.2–0.8 V vs. Ag/AgCl), non-aqueous Li-ion cells (potential window of 0.1–4.0 V vs. Li/Li+), and non-aqueous Na-ion cells (potential window of 0.1–4.0 V vs. Na/Na+), respectively. Additionally, a reversible, pressure-induced color change from pale yellow to dark brown/black was observed for the Na0.20WO3·0.81H2O sample when it was placed under pressures of 1000 psi or higher. Our results demonstrate the viability of chemical preintercalation synthesis approach to produce new oxide phases with interesting functional properties.Graphical abstract
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