TY - JOUR
T1 - Carbon sheet-decorated graphite felt electrode with high catalytic activity for vanadium redox flow batteries
AU - Gao, Yu
AU - Wang, Hongrui
AU - Ma, Qiang
AU - Wu, Anjun
AU - Zhang, Wei
AU - Zhang, Chuanxiang
AU - Chen, Zehua
AU - Zeng, Xian Xiang
AU - Wu, Xiongwei
AU - Wu, Yuping
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/7
Y1 - 2019/7
N2 - A carbon sheet-decorated graphite felt electrode was synthesized by in situ polymerization and subsequent high-temperature calcination under an inert atmosphere. The resultant material brings an improved wettability, numerous defect sites, and abundant O, N and P elements as additional catalytic sites to elevate the reaction kinetics and efficiency of vanadium redox flow batteries (VRFBs). The unique CS modifier enriches electrolyte diffusion pathways, which even show a unique capillary flow. The GF@CS displays a high catalytic activity towards the VO 2+ /VO 2 + , V 3+ /VO 2+ and V 2+ /V 3+ oxidation-reduction couples and a reduced cathodic and anodic peak potential difference of 355 mV (vs. 564 mV for GF). The improvement to the electrode results in a GF@CS-based battery presenting an increased capacity of 20.8 Ah L −1 compared to 13.0 Ah L −1 of the GF-based battery and an increase in power density from 225 mA cm −2 to 300 mA cm −2 . Furthermore, the battery exhibited a 74.79% energy efficiency (EE) at 150 mA cm −2 , with no attenuation even at 300 cycles. GF@CS greatly elevates the reaction kinetics and efficiency of VRFBs.
AB - A carbon sheet-decorated graphite felt electrode was synthesized by in situ polymerization and subsequent high-temperature calcination under an inert atmosphere. The resultant material brings an improved wettability, numerous defect sites, and abundant O, N and P elements as additional catalytic sites to elevate the reaction kinetics and efficiency of vanadium redox flow batteries (VRFBs). The unique CS modifier enriches electrolyte diffusion pathways, which even show a unique capillary flow. The GF@CS displays a high catalytic activity towards the VO 2+ /VO 2 + , V 3+ /VO 2+ and V 2+ /V 3+ oxidation-reduction couples and a reduced cathodic and anodic peak potential difference of 355 mV (vs. 564 mV for GF). The improvement to the electrode results in a GF@CS-based battery presenting an increased capacity of 20.8 Ah L −1 compared to 13.0 Ah L −1 of the GF-based battery and an increase in power density from 225 mA cm −2 to 300 mA cm −2 . Furthermore, the battery exhibited a 74.79% energy efficiency (EE) at 150 mA cm −2 , with no attenuation even at 300 cycles. GF@CS greatly elevates the reaction kinetics and efficiency of VRFBs.
UR - http://www.scopus.com/inward/record.url?scp=85063611686&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2019.03.035
DO - 10.1016/j.carbon.2019.03.035
M3 - 文章
AN - SCOPUS:85063611686
SN - 0008-6223
VL - 148
SP - 9
EP - 15
JO - Carbon
JF - Carbon
ER -
