Scholarlink

<p>High-value-added sulfur products as well as hydrogen (H<sub>2</sub>) can be obtained by electrolytic oxidation of hydrogen sulfide (H<sub>2</sub>S), which is a promising energy conversion technology that contributes to the resource utilization of the pollutants. In conventional sulfide oxidation reaction (SOR), the recovery of the anodic product typically requires additional acidification treatment, resulting in the unsustainable use of electrolyte. Here, a novel H<sub>2</sub>S direct electrolysis system with ionic liquid (IL)-based electrolyte, consisting of acetate-based ILs and NaOH aqueous solution, was investigated. Compared to single NaOH aqueous solution, [Hmim]Ac-based electrolyte showed high H₂S absorption capacity and best electrochemical performance for SOR. Significantly, the anodic sulfur product was proved to be α-sulfur, which could be self-precipitated from the electrolyte without extra acid. The [Hmim]Ac-based electrolyte has the highest equilibrium solubility of sulfur (30.8&#xa0;g L<sup>−1</sup>), which was 2–3 times that of the conventional electrolyte of NaOH aqueous solution. It is mainly attributed to the synergistic coupling of ILs and NaOH for H<sub>2</sub>S absorption and the modulating effect of ILs. Under constant potential electrolysis at 1.2&#xa0;V vs RHE in [Hmim]Ac-based electrolyte, the maximum current density reached 194.4&#xa0;mA&#xa0;cm<sup>−2</sup>, the maximum hydrogen production rate reached 3945&#xa0;μmol&#xa0;h<sup>−1</sup>, the Faraday efficiency reached 97.9%, and the sulfur recovery of 82.6%. The IL-based electrolyte can be reused for at least three cycles of absorption-electrolysis, holding promise for efficient and continuous electrolysis of H<sub>2</sub>S.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Sustainable and efficient H2S electrolysis enhanced by acetate-based ionic liquid

  • 期刊论文

  • 发表日期：

    2025年8月18日

查看全文
  • Weizhen Kong,
  • Jiaming Mao,
  • Qianqian Peng,
  • Shucan Qin,
  • Longmei Shi,
  • Anshuang Wu,
  • Shengyun Xu,
  • Jianming Shi,
  • Yanrong Liu,
  • Yunqian Ma

摘要

High-value-added sulfur products as well as hydrogen (H2) can be obtained by electrolytic oxidation of hydrogen sulfide (H2S), which is a promising energy conversion technology that contributes to the resource utilization of the pollutants. In conventional sulfide oxidation reaction (SOR), the recovery of the anodic product typically requires additional acidification treatment, resulting in the unsustainable use of electrolyte. Here, a novel H2S direct electrolysis system with ionic liquid (IL)-based electrolyte, consisting of acetate-based ILs and NaOH aqueous solution, was investigated. Compared to single NaOH aqueous solution, [Hmim]Ac-based electrolyte showed high H₂S absorption capacity and best electrochemical performance for SOR. Significantly, the anodic sulfur product was proved to be α-sulfur, which could be self-precipitated from the electrolyte without extra acid. The [Hmim]Ac-based electrolyte has the highest equilibrium solubility of sulfur (30.8 g L−1), which was 2–3 times that of the conventional electrolyte of NaOH aqueous solution. It is mainly attributed to the synergistic coupling of ILs and NaOH for H2S absorption and the modulating effect of ILs. Under constant potential electrolysis at 1.2 V vs RHE in [Hmim]Ac-based electrolyte, the maximum current density reached 194.4 mA cm−2, the maximum hydrogen production rate reached 3945 μmol h−1, the Faraday efficiency reached 97.9%, and the sulfur recovery of 82.6%. The IL-based electrolyte can be reused for at least three cycles of absorption-electrolysis, holding promise for efficient and continuous electrolysis of H2S.

Graphical abstract