TY - JOUR
AU - He, Hui
AB - In this work, Bi2O3 and Bi2S3 nanomaterials are modified with polyvinylpyrrolidone (PVP). The products are defined as Bi2O3@PVP and Bi2S3@PVP, respectively. SEM demonstrates that the addition of PVP helps to reduce the size of Bi2O3 and Bi2S3 nanomaterials. XRD exhibits that the structure of Bi2O3 changed from α-Bi2O3 to β-Bi2O3@PVP due to the addition of PVP, while the Bi2S3 configuration remained unchanged. XPS demonstrates that excess PVP leads to a partial reduction of trivalent Bi3+ to metallic Bi0. Their supercapacitive performances are tested and it is found that appropriate PVP can improve the capacitive performance and cyclic stability of both Bi2O3 and Bi2S3. The specific capacitance of Bi2O3@1 g PVP is 1.4 times that of the pristine Bi2O3, and the specific capacitance of Bi2S3@1 g PVP is 1.8 times that of the pristine Bi2S3. Compared with 82.0% Bi2O3 and 79.6% Bi2S3, the cyclic retention is 94.7% and 95.2% for Bi2O3@1 g PVP and Bi2S3@1 g PVP after 10,000 cycles. The reason for enhancement is that PVP can support Bi2O3 and Bi2S3 materials, not only to support their structural stability but also to reduce their size and facilitate electron transfer and ion diffusion.
TI - Polyvinylpyrrolidone-modified Bi2O3 and Bi2S3 nanocomposites for improved supercapacitive performance
JF - Journal of Materials Science Materials in Electronics
DO - 10.1007/s10854-023-10114-5
DA - 2023-03-01
UR - https://www.deepdyve.com/lp/springer-journals/polyvinylpyrrolidone-modified-bi2o3-and-bi2s3-nanocomposites-for-8HDtoG0C6c
VL - 34
IS - 7
DP - DeepDyve
ER -