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首页> 外文期刊>Clean >Solution pH Manipulates Sulfur and ElectricityRecovery From Aqueous Sulfide in an Air-CathodeFuel Cell
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Solution pH Manipulates Sulfur and ElectricityRecovery From Aqueous Sulfide in an Air-CathodeFuel Cell

机译：溶液的pH值可操纵空气阴极燃料电池中的硫化物水溶液中的硫和电回收

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摘要

The air-cathode fuel cell has great potential for simultaneous elemental sulfur (S0) and electricity recovery from aqueous sulfide. This work demonstrates the electrochemical oxidation of sulfide in the air-cathode fuel cell can be manipulated by controlling solution pH. Below pH 7 the sulfide oxidation produces S0 as the main product, while in alkaline solution another product thiosulfate is formed together with S0. Elevating solution pH improves the fraction of sulfide converted to thiosulfate by moving the equilibrium shift from H2S(aq) to polysulfide. In addition, electron transfer from aqueous sulfide to the carbon electrode is facilitated at high pH values. However, the passivation of electrode surface by S0 deposition is aggravated at increased pH values, thus slowing down the electrochemical oxidation rate of sulfide. The operation of the air-cathode fuel cell at pH 7 obtained the highest sulfur recovery efficiency of 71.3%, meanwhile the coulombic efficiency achieving as high as 55%.
机译：空气阴极燃料电池具有巨大的潜力，可以同时从硫化氢中回收元素硫（S0）和电。这项工作表明，可以通过控制溶液的pH值来控制空气阴极燃料电池中硫化物的电化学氧化。在pH低于7时，硫化物氧化生成S0作为主要产物，而在碱性溶液中，另一种产物硫代硫酸盐与SO一起形成。通过将平衡位移从H2S（aq）移至多硫化物，提高溶液的pH值可提高硫化物转化为硫代硫酸盐的比例。另外，在高pH值下促进了电子从硫化氢到碳电极的转移。然而，在增加的pH值下，通过S 0沉积使电极表面的钝化加剧，因此减慢了硫化物的电化学氧化速率。空气阴极燃料电池在pH值为7的情况下运行时，硫的回收率最高，达到71.3％，而库仑效率高达55％。

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  • 来源
    《Clean》 |2016年第9期|1140-1145|共6页
  • 作者

    Lin-Feng Zhai; Bo Wang; Min Sun;

  • 作者单位

    Department of Chemical Engineering, Hefei University of Technology, Hefei 230009, P. R. China;

    Department of Chemical Engineering, Hefei University of Technology, Hefei, P. R. China;

    Department of Chemical Engineering, Hefei University of Technology, Hefei, P. R. China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Electrochemistry; Renewables; Waste streams;

    机译：电化学;可再生能源;废物流;

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