方案一、
Schematic of the synthesis process of the Sn
2
P
2
O
7
/rGO composite.
图1、 Structure and chemical composition of Sn
2
P
2
O
7
and Sn
2
P
2
O
7
/rGO. (a) XRD patterns, (b) FTIR spectra, (c) Raman spectrum, (d) TGA curve, (e) survey spectra and high-resolution XPS spectra of (f) C 1s, (g) Sn 3d, (h) P 2p, and (i) O 1s.
图2.
Morphological characteristics and component distribution of Sn
2
P
2
O
7
/rGO. (a and b) SEM images, (c) TEM and (d) HRTEM images, and (e) EDS elemental mapping images.
图3、 SIB 的电化学性能。
图4、
Ex situ
TEM images (a–d), HRTEM images (e–h), SAED patterns (i–l) and EDS elemental mapping (m–p) of the Sn
2
P
2
O
7
/rGO electrode after 250, 500, 750, and 1000 cycles at a current density of 1 A g
−1
, respectively.
图5、 Sodium-ions storage kinetics analysis of the Sn
2
P
2
O
7
/rGO anode. (a) CV curves at various scan rates, (b) log(
i
)
versus
log(
v
) plots at specific peak currents, (c) capacitive contribution in the CV curve tested at 1 mV s
−1
, (d) capacitive contribution in the CV curves obtained at different scan rates. (e) EIS spectra (Nyquist plots) with the equivalent circuit model, (f) GITT curve and diffusivity
versus
state of discharge and charge during the selected second cycle, (g) the plot of
Z
′ and
ω
1/2
at low frequencies based on the Nyquist plots for Sn
2
P
2
O
7
/rGO and Sn
2
P
2
O
7
.
图6、 Sn2P2O7/rGO//AC SIC 的电化学性能。
