Aligned Electrospun Carbon Nanofibers as Electrodes for Vanadium Redox Flow Batteries

Zhang, Zhihui1; Bai, Bofeng1; Zeng, Lin3; Wei, Lei2; Zhao, Tianshou2

2019-08

10.1002/ente.201900488

Energy Technology   影响因子和分区

2194-4288

2194-4296

Electrospun carbon nanofibers (CNFs) are regarded as potential electrode materials for vanadium redox flow batteries (VRFBs) due to the advantages of a large surface area and good electrochemical activity. However, woven CNFs with randomly distributed fibers are limited by poor permeability of the electrolyte, thus leading to a large mass-transport polarization during battery operation. To address this issue, aligned carbon nanofiber (ACNF) webs are fabricated and applied in the battery with fibers parallel to the flow channel. Cyclic voltammogram results show that the as-prepared aligned electrode exhibits better electrochemical activity for both the VO2+/VO2+ and V2+/V3+ redox reactions than that of commercial carbon paper (CP) and random electrodes, attributing to its higher surface area and favorable surface activity. The battery with the ACNF electrode achieves higher voltage efficiency (87%, 60 mA cm(-2)) than that of CP and random electrodes. Moreover, the ordered structure of the aligned electrode further enhances mass transport effectively, thus lowering the concentration loss. The polarization curve measurements also show that the limiting current density of the aligned electrode is 25% higher than that of the random electrode. All these results demonstrate that the aligned electrode is promising in VRFBs.

aligned electrospun nanofibers mass transport polyacrylonitriles vanadium redox flow batteries

SCI ; EI

英语

其他

Research Grant Council of the Hong Kong Special Administrative Region, China[T23-601/17-R]

Energy & Fuels

Energy & Fuels

WOS:000480023900001

WILEY-V C H VERLAG GMBH

20193207276273

Carbon nanofibers ; Channel flow ; Electrolytes ; Flow batteries ; Mass transfer ; Polarization ; Polyacrylonitriles ; Redox reactions ; Vanadium

Vanadium and Alloys:543.6 ; Fluid Flow, General:631.1 ; Mass Transfer:641.3 ; Electric Batteries and Fuel Cells:702 ; Secondary Batteries:702.1.2 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Polymers:815.1.1 ; Solid State Physics:933

Web of Science

1.Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, HKUST Energy Inst, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

Zhang, Zhihui,Bai, Bofeng,Zeng, Lin,et al. Aligned Electrospun Carbon Nanofibers as Electrodes for Vanadium Redox Flow Batteries[J]. Energy Technology,2019,7(10).

Zhang, Zhihui,Bai, Bofeng,Zeng, Lin,Wei, Lei,&Zhao, Tianshou.(2019).Aligned Electrospun Carbon Nanofibers as Electrodes for Vanadium Redox Flow Batteries.Energy Technology,7(10).

Zhang, Zhihui,et al."Aligned Electrospun Carbon Nanofibers as Electrodes for Vanadium Redox Flow Batteries".Energy Technology 7.10(2019).