图1. Nb2O5/MoS2/C CNFs电极的合成过程示意图以及纯 CNFs 和经过多次折叠的 Nb2O5 CNFs 的照片。
图2. (a) XRD profiles and (b) Raman spectra of the synthesized samples.
图3. SEM images of (a) Nb
2
O
5
CNFs, (b) Pure MoS
2
, (c) Nb
2
O
5
/MoS
2
CNFs, and (d) Nb
2
O
5
/MoS
2
/C CNFs.
图4、 (a)-(c) TEM images of Nb
2
O
5
/MoS
2
/C CNFs; (d) TEM image of Nb
2
O
5
/MoS
2
/C CNFs with elemental mapping of O, C, Mo, Nb, and S.
图5. (a) Rate performance of Nb
2
O
5
CNFs, Nb
2
O
5
/MoS
2
CNFs, Nb
2
O
5
/MoS
2
/C CNFs, and Pure MoS
2
at different current densities. (b) Galvanostatic charging–discharging (GCD) curves of Nb
2
O
5
/MoS
2
/C CNFs for the initial four cycles (first, second, third, and fifth) at the current density of 0.1 A g
–1
. (c) Electrochemical impedance spectroscopy (EIS) results of Nb
2
O
5
/MoS
2
CNFs and Nb
2
O
5
/MoS
2
/C CNFs after 100 cycles at the current density of 0.1 A g
–1
. (d) Cycling performance of as-synthesized samples at a current density of 0.1 A g
–1
and the optical photos of the half-cell made up of Nb
2
O
5
/MoS
2
/C CNFs with LED light. (e) Galvanostatic charging–discharging (GCD) curves of Nb
2
O
5
/MoS
2
/C CNFs of first, 50th, and 100th cycle. (f) Comprehensive performance of as-prepared samples radar chart. (g) The discharge/charge curves and corresponding Na diffusion coefficients of Nb
+
2
O
5
/MoS
2
/C CNFs electrode during the first cycle GITT measurement after three cycles of small current activation. (h) The corresponding Na diffusion coefficients of Nb
+
2
O
5
/MoS
2
/C CNFs and Nb
2
O
5
/MoS
2
CNFs electrodes.
图
6. (a) CV curves at second cycle for Nb
2
O
5
CNFs, Nb
2
O
5
/MoS
2
CNFs, Nb
2
O
5
/MoS
2
/C CNFs, and Pure MoS
2
at a scan rate of 0.5 mV s
–1
. (b) CV curves for the first five cycles of the Nb
2
O
5
/MoS
2
/C CNFs electrode at a scan rate of 0.5 mV s
–1
. (c) CV curves of Nb
2
O
5
/MoS
2
/C CNFs electrode recorded at scan rates ranging from 1 to 10 mV s
–1
. (d) Logarithmic plot of scan rate versus peak current, derived from CV curves. (e) Capacitive contribution curves at the scan rate of 1 mV s
–1
. (f) Variation in the capacitive contribution of Nb
2
O
5
/MoS
2
/C CNFs at varying sweep rates.
图7. (a) The crystal structure of Nb
2
O
5
/MoS
