文献类型：期刊文献

英文题名：Heteroatom co-doped biomass carbon modified electrodes for all-vanadium redox flow batteries with ultra-low decay rate of energy efficiency

作者：Zhou, Anhui[1];Shao, Xiang[1];Li, Danni[1];Du, Yan[1];Zhang, Yuting[1];Cao, Limei[1];Yang, Ji[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：591

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20234915146202);WOS:【SCI-EXPANDED(收录号:WOS:001128393700001)】；

语种：英文

外文关键词：Vanadium; Graphite felt; Chitosan biomass carbon; Phosphorus-doping; Durability

摘要：The intermittent nature of renewable energy calls for advanced energy storage systems, of which all-vanadium redox flow batteries (VRFBs) are recognized as the most promising long-duration energy storage devices. The most common electrode for VRFBs is graphite felt (GF), however with poor hydrophilicity and weak electrochemical activity, making it difficult to be a perfect electrode. In this work, we report a nitrogen-phosphorus codoped biomass carbon modified GF (NP-GF), in which the introduction of cross-linking agents enhances the linkage between the carbon material and the GF. With excellent electrolyte wettability and electrochemical catalytic activity, the NP-GF electrode exhibits enhanced electrochemical activity and reversibility for VO2+/VO2+ and V2+/V3+ in electrochemical tests. The coulombic efficiency (CE), voltage efficiency (VE), and energy efficiency (EE) are all boosted at current densities of 80-280 mA cm-2 in VRFB single cell tests assembled with NPGF. The power density of the VRFB reaches a peak of 757.0 mW cm-2. Furthermore, the VRFB has an extremely low EE decay rate per cycle (0.0018 %), demonstrating superior electrochemical performance stability.