Mei Jun, Liao Ting, Ayoko Godwin A, Sun Ziqi
School of Chemistry, Physics and Mechanical Engineering , Queensland University of Technology , Brisbane , Queensland 4001 , Australia.
ACS Appl Mater Interfaces. 2019 Aug 7;11(31):28205-28212. doi: 10.1021/acsami.9b09882. Epub 2019 Jul 24.
Two-dimensional (2D) bismuth oxide (BiO) heterostructured nanosheets (BOHNs) were first fabricated by a solution-based molecular self-assembly approach. The synthesized BOHNs nanosheets feature mixed α- and β-phases and rich surface/edge-active sites. When utilized as anode materials for rechargeable batteries, dual-phase BOHNs deliver an initial discharge capacity as high as 647.6 mAh g and an increased capacity of over 200 mAh g remained after 260 cycles for lithium-ion batteries (LIBs), and a stable cycling capacity at ∼50 mAh g after 500 cycles for sodium-ion batteries (SIBs). A novel flexible 2D/1D/2D structure is further developed by implanting 2D BOHNs into conductive 1D carbon nanotubes and 2D graphene to form composite (BOHNCG) paper as free-standing anodes for both LIBs and SIBs. The capacity of 2D/1D/2D BOHNCG as a LIB anode reaches 823.5 mAh g, corresponding to an enhancement of ∼27%, and remains at >110 mAh g after 80 cycles as a SIB anode with greatly improved cycling stability. This work verifies the promising potential of 2D BOHNs for practical energy-related devices and enriches the current research on emerging 2D nanomaterials.
二维（2D）氧化铋（BiO）异质结构纳米片（BOHNs）首次通过基于溶液的分子自组装方法制备而成。合成的BOHNs纳米片具有混合的α相和β相以及丰富的表面/边缘活性位点。当用作可充电电池的负极材料时，双相BOHNs在锂离子电池（LIBs）中初始放电容量高达647.6 mAh g，在260次循环后仍有超过200 mAh g的容量增加；在钠离子电池（SIBs）中，经过500次循环后，循环容量稳定在约50 mAh g。通过将二维BOHNs植入导电的一维碳纳米管和二维石墨烯中，进一步开发了一种新型的柔性二维/一维/二维结构，以形成复合（BOHNCG）纸，作为LIBs和SIBs的独立负极。二维/一维/二维BOHNCG作为LIB负极的容量达到823.5 mAh g，提高了约27%，作为SIB负极在80次循环后保持在>110 mAh g，循环稳定性大大提高。这项工作验证了二维BOHNs在实际能源相关器件中的潜在应用前景，并丰富了当前对新兴二维纳米材料的研究。
