Abstract Transition-metal chalcogenides (TMCs) have attracted much attention as their good electrical conductivity and high lithium storage capacity. In this work, a simple and scalable approach was employed to synthesize CoSe nanoparticles confined in bifunctional N-doped carbon framework/carbon layer (CoSe/NC/C). Specifically, pyrolysis of cobalt phthalocyanine (CoPc)/Selenium mixtures was accompanied by Ethanol Steam Reforming (ESR) simultaneously, which could bring in double carbon network and restrict the growth of CoSe grains effectively to achieve more stable structure and fast ion/electron transfer within CoSe electrode. As a result, CoSe/NC/C composite delivers a superior discharge capacity of 531 mA h g-1 after 400 cycles at 1 A g-1 at room temperature and a remarkable cycling stability (458 mA h g-1 after 100 cycles at 1 A g-1) at elevated temperature (55 ℃). This excellent electrochemical performance may be attributed to the following factors. (a) The bifunctional carbon architecture can not only endow the composites with superior conductivity and enhanced structure stability, but also facilitate the uniform distribution of nano-sized CoSe. (b) The effective catalytic activity is inspired by the synergistic effect between CoSe nanoparticles and bifunctional carbon, which is supposed to contribute significant capacity and manifest distinct pseudocapacitive behavior, especially at high current density.

中文翻译：

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钴酞菁衍生的双功能碳装饰的CoSe具有增强的锂存储能力

摘要 过渡金属硫属化物（TMCs）因其良好的导电性和高的锂存储容量而备受关注。在这项工作中，采用一种简单且可扩展的方法来合成限制在双功能 N 掺杂碳框架/碳层 (CoSe/NC/C) 中的 CoSe 纳米颗粒。具体而言，钴酞菁（CoPc）/硒混合物的热解同时伴随着乙醇蒸汽重整（ESR），这可以带来双碳网络并有效限制CoSe晶粒的生长，以实现更稳定的结构和更快的离子/电子转移。 CoSe 电极。因此，CoSe/NC/C 复合材料在室温下以 1 A g-1 进行 400 次循环后可提供 531 mAh g-1 的优异放电容量和显着的循环稳定性（在 1 A g-1 下进行 100 次循环后为 458 mAh g-1） 1）在高温（55℃）下。这种优异的电化学性能可归因于以下因素。(a) 双功能碳结构不仅可以赋予复合材料优异的导电性和增强的结构稳定性，还可以促进纳米级 CoSe 的均匀分布。(b) 有效催化活性受到 CoSe 纳米颗粒和双功能碳之间的协同效应的启发，这应该有助于显着的容量并表现出明显的赝电容行为，尤其是在高电流密度下。这种优异的电化学性能可归因于以下因素。(a) 双功能碳结构不仅可以赋予复合材料优异的导电性和增强的结构稳定性，还可以促进纳米级 CoSe 的均匀分布。(b) 有效催化活性受到 CoSe 纳米颗粒和双功能碳之间的协同效应的启发，这应该有助于显着的容量并表现出明显的赝电容行为，尤其是在高电流密度下。这种优异的电化学性能可归因于以下因素。(a) 双功能碳结构不仅可以赋予复合材料优异的导电性和增强的结构稳定性，还可以促进纳米级 CoSe 的均匀分布。(b) 有效催化活性受到 CoSe 纳米颗粒和双功能碳之间的协同效应的启发，这应该有助于显着的容量并表现出明显的赝电容行为，尤其是在高电流密度下。