Scalable Ir-Doped NiFe2O4/TiO2 Heterojunction Anode for Decentralized Saline Wastewater Treatment and H2 Production

IF 26.6 1区 材料科学 Q1 Engineering Nano-Micro Letters Pub Date : 2024-10-28 DOI:10.1007/s40820-024-01542-x
Sukhwa Hong, Jiseon Kim, Jaebeom Park, Sunmi Im, Michael R. Hoffmann, Kangwoo Cho
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Abstract

Highlights

  • Ir-doped NiFe2O4 (NFI) spinel with TiO2 heterojunction overlayer brought about outstanding chlorine evolution reaction in circumneutral pH.

  • Electroanalyses including operando X-ray absorption spectroscopy uncovered the active role of TiO2 for Cl chemisorption.

  • NFI/TiO2 anode boosted both NH4+-to-N2 conversion and H2 generation in wastewater, and the practical applicability was confirmed with scaled-up anodes and real wastewater.

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可扩展的掺铱 NiFe2O4/TiO2 异质结阳极,用于分散式含盐废水处理和 H2 生产。
用于分散式废水处理/回用的废水电解槽(WECs)与 H2 生产相结合,可减少与水、废物和能源载体运输相关的碳足迹。本研究报告了掺铒镍铁氧体(NFI,约 5 at% Ir)尖晶石层和 TiO2 覆盖层(NFI/TiO2),作为一种可扩展的异质结阳极,用于在单室电池中直接电解周围 pH 值为中性的废水。在稀释(0.1 M)的氯化钠溶液中,NFI/TiO2 的活性和氯进化反应选择性均优于基准的 IrO2。在接近中性 pH 值的条件下,其稳健的运行也得到了证实。包括操作性 X 射线吸收光谱在内的电分析揭示了 TiO2 的关键作用,它既是 Cl- 化学吸附的主要场所,又是作为欧姆接触的 NFI 的保护层。对含有 NH4+ 的合成废水进行静电电解表明,NFI/二氧化钛不仅实现了 NH4+ 到 N2 的准均一转化,还提高了 H2 的生成效率,同时将溶解氧和活性氯的还原等竞争反应降至最低。使用 NFI/TiO2 的扩大型 WEC 已在电解厕所废水中得到验证。
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来源期刊
Nano-Micro Letters
Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
32.60
自引率
4.90%
发文量
981
审稿时长
1.1 months
期刊介绍: Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.
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