Mo2C 晶体的原位生长刺激 N 掺杂碳纳米束上 MoO2 颗粒的钠离子存储特性,Industrial & Engineering Chemistry Research

当前位置： X-MOL 学术 › Ind. Eng. Chem. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mo2C 晶体的原位生长刺激 N 掺杂碳纳米束上 MoO2 颗粒的钠离子存储特性
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-02-20 , DOI: 10.1021/acs.iecr.2c03712
Shile Chu _{1,

2} , Tao Lu _{1,

2} , Fanyan Zeng _{1,

2} , Baoquan Liu ₂ , Yaohui Qu ₁ , Yang Pan ₁

Affiliation

钠离子电池 (SIB) 被认为是即将到来的大规模储能系统的候选者。然而，过渡金属氧化物仍然存在活性位点利用率不足的问题，主要表现在长循环中的实用容量较低。在这里，通过自聚合和两步法设计了在表面带有 MoO 2 颗粒的_N掺杂碳纳米束 (N-CNB) 中原位生长的Mo 2 _C晶体的_复合材料 ( MoO ₂ @Mo 2 C/C)煅烧。通过一系列表征和测试，发现 N-CNBs 赋予复合材料更高的导电性和增强的结构稳定性，有效缓解了 MoO 的体积膨胀和结构坍塌_2个粒子。_{Mo 2} C晶体与MoO ₂颗粒/N-CNBs (Mo ₂ C/C)的高度集成进一步增强了复合材料的电荷转移能力和结构稳定性。_{重要的是，MoO 2}颗粒和Mo ₂ C晶体的存储位置在钠离子存储过程中逐渐被激活，显着提高了长循环中的有效容量。^{在 5.0 A g –1}下循环 8000 次后，作为 SIB 负极的MoO ₂ @Mo ₂ C/C的可逆容量从 126.2 逐渐增加到 419.1 mAh g ^–1，容量保持率高达332.4%。该研究充分展示了金属碳化物在储能方面的潜在优势，可为金属离子电池的发展提供良好的参考。

"点击查看英文标题和摘要"

In Situ Growth of Mo2C Crystals Stimulating Sodium-Ion Storage Properties of MoO2 Particles on N-Doped Carbon Nanobundles

Sodium-ion batteries (SIBs) are considered as the candidate for the upcoming large-scale energy storage systems. However, transition-metal oxides still have the problem of insufficient utilization of active sites, mainly signified by the low practical capacity in long cycles. Here, the composite (MoO₂@Mo₂C/C) of Mo₂C crystals in situ grown in N-doped carbon nanobundles (N-CNBs) with MoO₂ particles on their surface is designed by self-polymerization and two-step calcination. Through a series of characterizations and tests, it is found that the N-CNBs endow the composite with improved conductivity and reinforced structural stability and effectively alleviates the volume expansion and structural collapse of MoO₂ particles. The high integration of Mo₂C crystals with MoO₂ particles/N-CNBs (Mo₂C/C) further enhances the charge-transfer ability and structural stability for the composite. Importantly, the storage sites of MoO₂ particles and Mo₂C crystals are gradually activated during sodium-ion storage, significantly improving the effective capacity in the long cycles. After 8000 cycles at 5.0 A g^–1, the reversible capacity of MoO₂@Mo₂C/C as a SIB anode gradually increases from 126.2 to 419.1 mAh g^–1, with a capacity retention of up to 332.4%. This study fully demonstrates the potential advantages of metal carbides in energy storage and can provide a good reference for the development of metal ion batteries.

更新日期：2023-02-20

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南