Fei Xing, Qiang Fu, Feng Xing, Jian Zhao, Haoyang Long, Tao Liu, Xianfeng Li
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引用次数: 0
摘要
钒液流电池(VFB)被认为是最有希望实现大规模储能的候选电池之一。然而,由于严重的电化学极化,钒液流电池的功率密度相对较低。在此,我们报告了由掺杂 N 的碳调控石墨毡电极(Bi SAs/NC@GF)支持的 Bi 单原子,由于活性位点的极大改善和 Bi-N4 配置的优化,该电极具有很高的电催化活性和稳定性。电化学原位表征和理论计算阐明了[V(H2O)6]3+/[V(H2O)6]2+的脱溶过程和特定内球反应机制。结果,与 NC@GF 相比,用 Bi SAs/NC@GF 组装的 VFB 单电池在 240 mA cm-2 电流条件下的能效高达 81.1%(70.5%)。此外,首次组装了配备 Bi SAs/NC@GF 的 5 kW VFB 堆,并稳定运行了 400 多个循环。这项工作证实,单原子催化剂对于可扩展的高功率密度、低成本 VFB 是有效的。
Bismuth Single Atoms Regulated Graphite Felt Electrode Boosting High Power Density Vanadium Flow Batteries
Vanadium flow batteries (VFBs) are considered one of the most promising candidates for large-scale energy storage. However, VFBs suffer from relatively low power density due to severe electrochemical polarization. Herein, we report Bi single atoms supported by an N-doped carbon-regulated graphite felt electrode (Bi SAs/NC@GF) with high electrocatalytic activity and stability, owing to the greatly improved active sites and optimized Bi–N4 configuration. Electrochemical in situ characterization and theoretical calculations elucidate the desolvation process and specific inner sphere reaction mechanism of [V(H2O)6]3+/[V(H2O)6]2+. As a result, a VFB single cell assembled with Bi SAs/NC@GF achieves a much higher energy efficiency of 81.1% at 240 mA cm–2 than NC@GF (70.5%). Moreover, a 5 kW VFB stack equipped with Bi SAs/NC@GF is assembled for the first time and ran stably for over 400 cycles. This work confirms that a single-atom catalyst is efficient for scalable VFBs with high power density and low cost.
期刊介绍:
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