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【水系锌电】 南京理工大学AEM:准零间隙流式水系锌-二氧化碳电池-Weiliang Li

  • 2026-03-22 07:21:02
【水系锌电】 南京理工大学AEM:准零间隙流式水系锌-二氧化碳电池-Weiliang Li

【论文链接】

https://doi.org/10.1002/aenm.70835

【作者单位】

南京理工大学

【论文摘要】

水系锌-二氧化碳电池(AZCBs)能够同时发电并将CO₂转化为有价值的产品,但其发展受到传质差、反应活性低等问题的限制。本文开发了具有流动CO₂气体和电解液、气体扩散阴极,特别是准零极间距特征的AZCBs。通过在准零间隙AZCB中采用碳包覆氧化铋(Bi₂O₃/C)作为阴极,实现了创纪录的峰值功率密度67.0 mW cm⁻²(电流密度为117.5 mA cm⁻²),并展现出超过600次循环的优异循环性能。具体而言,近零极间距通过在CO₂电还原反应界面建立增强的浓度梯度,显著促进了氢氧根离子传输和CO₂扩散。理论模拟进一步表明,由于通过*OCHO中间体在铋位点上的有利*O吸附,甲酸产物的优先生成源于其相比CO路径更低的能垒。这项工作所开发的AZCBs在模拟火星大气中能够高效稳定运行,对未来人类火星探索具有广阔前景,为同时实现能源供应和CO₂资源化利用提供了潜在解决方案。

【实验方法】

铋基金属有机框架的合成将100 mg乙酸铋[Bi(CH₃COO)₃]和119 mg 2,3,6,7,10,11-六羟基苯并菲(2,3,6,7,10,11-HHTP)加入到含有200 mL去离子水的烧瓶中,搅拌5分钟,超声分散10分钟。然后在85 ℃油浴中加热24小时,冷却至室温后用去离子水离心洗涤数次,并在60 ℃真空干燥箱中干燥24小时。向混合物中加入30 mL乙酸乙酯,持续搅拌10分钟,随后静置,待固体沉降后更换新的乙酸乙酯。重复该操作三次后,收集沉淀并在60 ℃真空干燥箱中干燥24小时。

碳包覆氧化铋的合成将Bi-HHTP置于管式炉中,控制升温速率为3.5 ℃/min,在空气中350 ℃煅烧90分钟。冷却至室温后,收集黄色产物。Bi₂O₃/C@250和Bi₂O₃/C@400的制备方法与Bi₂O₃/C@350相同,煅烧温度分别为250 ℃和400 ℃。

【图文摘取】

【主要结论】

本文研究设计并构建了一种采用玻璃砂芯隔膜置于锌负极与Bi₂O₃/C@350气体扩散电极(GDE)正极之间的准零极间距水系锌-二氧化碳电池(AZCB)。

(1)该近零间隙AZCB展现出远优于H型和流动型电池的性能,具有高达67.0 mW cm⁻²的峰值功率密度、0.57 V的放电电位和117.5 mA cm⁻²的电流密度,同时具备超过600次循环的优异稳定性。所制备的准零间隙AZCB的优异电池性能源于氢氧根离子和CO₂传质的显著促进,以及Bi₂O₃/C@350催化剂高效且选择性的CO₂电催化转化能力。

(2)重要的是,最小化的电极间距可改善氢氧根离子传输,从而提升反应界面的电池性能和CO₂消耗速率,进而形成有利于CO₂,D(溶解态CO₂)和CO₂,G(气态CO₂)扩散及其转化的大浓度梯度。

(3)这反过来又极大地进一步提升了电池性能,构成了电池性能与传质之间的双向促进机制,这种零间隙AZCB在类火星大气环境下同样表现出优异性能,为火星探索提供了一种极具前景的能源与原料解决方案。

本工作为AZCBs提出了一种创新的电池构型,突破了传统H型结构的性能极限,极大地推动了水系CO₂电池从实验室研究向实际应用的转化,不仅适用于地球,也为火星应用提供了可能。

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  1. CONNECT:[ UseTime:0.000603s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001661s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000827s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000700s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001545s ]
  6. SELECT * FROM `set` [ RunTime:0.000611s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001634s ]
  8. SELECT * FROM `article` WHERE `id` = 511664 LIMIT 1 [ RunTime:0.001133s ]
  9. UPDATE `article` SET `lasttime` = 1774143911 WHERE `id` = 511664 [ RunTime:0.001452s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000700s ]
  11. SELECT * FROM `article` WHERE `id` < 511664 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001237s ]
  12. SELECT * FROM `article` WHERE `id` > 511664 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002450s ]
  13. SELECT * FROM `article` WHERE `id` < 511664 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002208s ]
  14. SELECT * FROM `article` WHERE `id` < 511664 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002777s ]
  15. SELECT * FROM `article` WHERE `id` < 511664 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005610s ]
0.114228s