摘要
In this study,for thefirst time,Cu_(2)Nb_(34)O_(78)nanowires were fabricated via an electrospinning technique and exhibited outstanding electrochemical performance as an anode material.The nanowires presented a charge capacity of 279.8 mA h g^(−1)with remarkable long-life stability for 300 cycles(0.037%capacity loss per cycle).Significantly,ex situ X-ray diffraction,ex situ high-resolution transmission electron microscopy,and ex situ X-ray photoelectron spectroscopy were performed to unveil the reaction process and change in the microstructure during charge/discharge cycles in detail.The observed evidence demonstrates that the remarkable Li-storage capability is due to the enhanced contact-specific area and reduced transport path of Cu_(2)Nb_(34)O_(78)nanowires.In addition,the host mechanism is unraveled,in which the contribution of the reversible capacity is discussed based on the Nb^(5+)/Nb^(4+),Nb^(4+)/Nb^(3+)and Cu_(2)+/Cu^(+)redox couples.
基金
supported by NSAF Joint Fund(U1830106)
Science and Technology Innovation 2025 Major Program of Ningbo(2018B10061)
K.C.Wong Magna Fund in Ningbo University.
