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Template-mediated growth of tungsten oxide with different morphologies for electrochemical application
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127309
Zhen Tong , Min Wen , Changqiang Yu , Yanhong Yin , Xianbin Liu , Yesheng Li , Chunfa Liao , Qiulin Zhang , Ziping Wu , Dionysios D. Dionysiou

Abstract The morphology of tungsten oxide (WO3) was effectively mediated by carbon nanotubes (CNTs) as templates. The grown direction of WO3 on the CNT bundle surfaces could be controlled, which mainly depended on the distribution state of tungsten acid (H2WO4) precursor in the reaction system. After thermal treatment of H2WO4/CNTs under nitrogen gas flow, WO3 with different morphologies (plates, short rods, and long rods) and sizes (10–1000 nm) supported by CNT bundles were finally obtained. The results indicated CNT bundles as templates can play an important role in regulating the morphologies of WO3. Moreover, the study shows that CNT bundles exhibit excellent prospects in the tailor-synthesis of micro/nanostructured materials with different dimensions. According to the peak current density for the 1000th electrochemical cycle in 0.5 mol L−1 H2SO4 and 0.5 mol L−1 CH3OH electrolyte solution, short rod-like WO3/CNTs exhibited higher peak current density (43.2 mA cm−2) than long rod-like WO3/CNTs (23.68 mA cm−2), plate-like WO3/CNTs (15.63 mA cm−2), CNTs (2.25 mA cm−2), and commercial WO3 (3.19 mA cm−2). The results demonstrated the potential application of short rod-like WO3/CNTs materials for hydrogen oxidation reaction of methanol fuel cells and in other related fields.

中文翻译:

用于电化学应用的不同形貌氧化钨的模板介导生长

摘要 以碳纳米管(CNTs)为模板,氧化钨(WO3)的形貌得到了有效的调控。WO3在CNT束表面的生长方向是可控的,这主要取决于反应体系中钨酸(H2WO4)前驱体的分布状态。在氮气流下对 H2WO4/CNTs 进行热处理后,最终获得了由 CNT 束支撑的具有不同形态(板、短棒和长棒)和尺寸(10-1000 nm)的 WO3。结果表明,CNT 束作为模板可以在调节 WO3 的形态方面发挥重要作用。此外,该研究表明,CNT 束在不同尺寸的微/纳米结构材料的定制合成中表现出良好的前景。根据 0 时第 1000 次电化学循环的峰值电流密度。5 mol L-1 H2SO4 和 0.5 mol L-1 CH3OH 电解质溶液,短棒状 WO3/CNTs 表现出比长棒状 WO3/CNTs(23.68 mA cm-2)更高的峰值电流密度(43.2 mA cm-2) 、板状 WO3/CNTs (15.63 mA cm-2)、CNTs (2.25 mA cm-2) 和商用 WO3 (3.19 mA cm-2)。结果证明了短棒状 WO3/CNTs 材料在甲醇燃料电池的氢氧化反应和其他相关领域的潜在应用。
更新日期:2020-04-01
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