Liu Yingwei, Sun Siwei, Han Jie, Gao Cong, Fan Lei, Guo Rong
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P. R. China.
Langmuir. 2021 Feb 16;37(6):2195-2204. doi: 10.1021/acs.langmuir.0c03523. Epub 2021 Feb 3.
Multi-yolk-shell MnO@mesoporous carbon (MnO@m-carbon) nanopomegranates, featuring MnO nanoparticles within cavities of m-carbon with internal space between the MnO nanoparticle and a cavity carbon shell, were subtly constructed. Moreover, the buffer space was well controlled by means of regulating the size of the cavity in m-carbon or the content of MnO. The results of electrochemical measurements demonstrated that MnO(10)@m-carbon(22) nanopomegranates (MnO nanoparticle, 15 nm; cavity size, 22 nm) had the best cycling and rate performance for lithium ion storage. The pomegranate-like MnO@m-carbon nanostructures have shown several advantages for their excellent performance: the nanocavity in m-carbon can restrict the growth and agglomeration of MnO nanoparticles; the well-interconnected mesoporous carbon matrix provides a "highway" for electrons and lithium ion transport; the voids between the MnO nanoparticle and cavity shell can alleviate the volume expansion.
巧妙构建了多蛋黄壳MnO@介孔碳（MnO@m-碳）纳米石榴籽结构，其特征是在介孔碳的腔内含有MnO纳米颗粒，且MnO纳米颗粒与腔碳壳之间存在内部空间。此外，通过调节介孔碳中腔的尺寸或MnO的含量，可以很好地控制缓冲空间。电化学测量结果表明，MnO(10)@m-碳(22)纳米石榴籽（MnO纳米颗粒，15纳米；腔尺寸，22纳米）在锂离子存储方面具有最佳的循环和倍率性能。石榴籽状的MnO@m-碳纳米结构因其优异的性能展现出几个优势：介孔碳中的纳米腔可以限制MnO纳米颗粒的生长和团聚；相互连通良好的介孔碳基质为电子和锂离子传输提供了一条“高速公路”；MnO纳米颗粒与腔壳之间的空隙可以缓解体积膨胀。
