Abstract

A novel hybrid, highly dispersed spinel Co-Mo sulfide nanoparticles on reduced graphene oxide (Co₃S₄/CoMo₂S₄@rGO), is reported as anode for lithium and sodium ion storage. The hybrid is synthesized by one-step hydrothermal method but exhibits excellent lithium and sodium storage performances. The as-synthesized Co₃S₄/CoMo₂S₄@rGO presents reversible capacity of 595.4 mA·h·g⁻¹ and 408.8 mA·h·g⁻¹ after 100 cycles at a current density of 0.2 A·g⁻¹ for lithium and sodium ion storages, respectively. Such superior performances are attributed to the unique composition and structure of Co₃S₄/CoMo₂S₄@rGO. The rGO provides a good electronically conductive network and ensures the formation of spinel Co₃S₄/CoMo₂S₄ nanoparticles, the Co₃S₄/CoMo₂S₄ nanoparticles provide large reaction surface for lithium and sodium intercalation/deintercalation, and the spinel structure allows fast lithium and sodium ion diffusion in three dimensions.

中文翻译：

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还原型氧化石墨烯上高度分散的Co-Mo硫化物纳米粒子，用于存储锂和钠离子

抽象的

据报道，在还原的氧化石墨烯（Co ₃ S ₄ / CoMo ₂ S ₄ @rGO）上的新型杂化，高度分散的尖晶石Co-Mo硫化物纳米粒子可作为锂和钠离子存储的阳极。该杂化物通过一步水热法合成，但具有出色的锂和钠储存性能。合成后的Co ₃ S ₄ / CoMo ₂ S ₄ @rGO在电流密度为0.2 A·g ^{-1的情况下}经过100次循环后呈现出595.4 mA·h·g ^-1和408.8 mA·h·g ^-1的可逆容量。分别用于锂和钠离子存储。如此优异的性能归因于Co ₃ S ₄ / CoMo ₂ S ₄ @rGO的独特组成和结构。rGO提供了良好的导电网络，并确保了尖晶石Co ₃ S ₄ / CoMo ₂ S ₄纳米颗粒的形成，Co ₃ S ₄ / CoMo ₂ S ₄纳米颗粒为锂和钠的嵌入/脱嵌提供了较大的反应表面，并且尖晶石结构允许锂和钠离子在三个维度上快速扩散。