对碳结构和功能特征的光电化学研究,用于流电池的氧化还原反应
Ha H Phan1, Jon G Bell1, Greg A Mutch2
1Wolfson Northern Carbon Reduction Laboratories, School of Engineering, Newcastle University Newcastle upon Tyne NE1 7RU UK anh.phan@ncl.ac.uk mark.thomas@ncl.ac.uk.
概括
可持续的核桃碳增强了氧化还原流电池的性能. 表面功能组和碳结构显著影响氧化还原反应,提高电池效率.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 氧化还原流电池 (VRFB) 对于大规模的电力存储至关重要.
- VRFB 的性能在很大程度上取决于电极材料,特别是基于碳的复合材料.
- 需要可持续且具有成本效益的电极材料来提高VRFB的可行性.
研究的目的:
- 调查核桃衍生碳的结构特征对氧化还原反应的影响.
- 探索热解,气化和化学处理如何改变碳特性以提高电化学性能.
- 为了将碳结构,多孔性和表面功能群与VRFB效率相关联.
主要方法:
- 通过热解,气化和化学处理 (HNO3,K2CO3,NH3) 来改变碳材料.
- 碳结构 (拉曼,XRD),多孔性 (气体吸附) 和功能组 (XPS,定位,TPD,FTIR) 的表征.
- 使用循环电压测量和电阻谱学的电化学评估.
主要成果:
- 碳结构的修改显著影响了氧化还原对 (VO2+/VO2+和V2+/V3+).
- 高达800°C的最佳碳化温度增强了观察到的氧化还原对.
- 表面功能组,特别是氧和部位,催化V3+氧化,尽管动力学是有限的.
结论:
- 来自核桃的碳素对VRFB电极具有有前途的特性.
- 调整碳结构和表面化学是优化氧化还原反应的关键.
- 开发的碳电极证明了适合电池应用的库伦比,电压和能量效率.
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