对于高性能聚硫化物回氧流电池的层次纳米电催化反应器
1State Key Laboratory for Physical Chemistry of Solid Surfaces, Innovation Laboratory for Sciences and Technologies of Energy Material of Fujian Province (IKKEM), Collaborative Innovation Center of Chemistry for Energy Materials (iChem), Engineering Research Center of Electrochemical Technologies of Ministry of Education, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China.
ACS nano
|October 3, 2023
概括
这项研究引入了纳米封闭的有序分层多孔和编碳 (OHP-Co/NC),以增强水性多硫化物氧化还原流电池 (RFB). OHP-Co/NC催化剂显著改善了质量转移和氧还原动力学,提高了电池的性能和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性聚硫化物是低成本,高容量的氧化还原流电池 (RFB) 的关键.
- 聚硫化物氧化还原对的缓慢动力学限制了RFB中的功率密度和材料利用率.
- 开发高效的电催化剂对于推进基于聚硫化物的RFB至关重要.
研究的目的:
- 开发一种新的电催化剂,以提高水性多硫化物氧化还原流电池的性能.
- 调查纳米封闭,层次性的多孔结构在改善聚硫化物氧化还原活性和质量转移中的作用.
- 阐明催化剂减轻多硫化物降解途径的机制.
主要方法:
- 顺序排列的层次性多孔和编碳 (OHP-Co/NC) 电催化剂的合成.
- 用有限元法 (FEM) 模拟来分析质量转移特性.
- 电化学表征包括循环电压测量和静电电荷-放电循环.
- 在操作中和在现场,拉曼光谱法用于研究聚硫化物在催化剂表面的行为.
主要成果:
- 该OHP-Co/NC催化剂显著增强了质量转移和氧化还原电解质利用率 (50.1%与23.3%对比).
- 在OHP-Co/NC-850催化剂中,呈现出最小的氧化还原电位差异 (ΔE = 99 mV),表明了快速的动力学.
- 谱学研究证实了S42的强烈吸附,并抑制了多硫化物的不成比例/水解.
- 使用OHP-Co/NC-850的聚硫化物/铁化物RFB实现了高功率密度 (110mW cm−2) 和出色的循环稳定性 (>在300个循环中保持99.7%).
结论:
- 排序层次的多孔Co和N-合碳 (OHP-Co/NC) 作为水性多硫化物有效的电催化反应器.
- 催化剂的独特结构增强了质量转移和聚硫化物氧化还原动力学,克服了传统材料的局限性.
- OHP-Co/NC催化剂显著提高了聚硫化物/铁化物氧化回氧流电池的功率密度和长期稳定性.
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