NiFe pyrophosphate enables long-term alkaline seawater oxidation at an ampere-level current density

IF 10 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Today Physics Pub Date : 2024-11-13 DOI:10.1016/j.mtphys.2024.101592

Yujie Yuan , Zixiao Li , Xun He , Hefeng Wang , Hong Tang , Xiaolan Tang , Qiuying Dai , Dongdong Zheng , Shengjun Sun , Yongsong Luo , Mohamed S. Hamdy , Fatma A. Ibrahim , Tingshuai Li , Bo Tang , Xuping Sun

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Abstract

Seawater electrolysis has potential for scalable hydrogen (H₂) production, yet anode corrosion by chloride ions (Cl⁻) remains a critical challenge. Herein, we present an amorphous NiFe pyrophosphate (P₂O₇⁴⁻) on Ni foam (NiFe-PPi/NF) for long-term alkaline seawater oxidation (ASO). Ex situ and in situ characterizations demonstrate that the in situ released P₂O₇⁴⁻ can act as an anion protective layer, effectively repelling Cl⁻ and safeguarding high-valence active metal sites during ASO. Through surface-anticorrosion design, NiFe-PPi/NF demonstrates stable operation at 1000 mA cm⁻² for over 1000 h with no loss in activity and requires a low overpotential of just 370 mV to achieve this industrial current density in alkaline seawater. This study offers a valuable strategy for developing corrosion-resistant anodes for ASO.

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焦磷酸镍铁合金可在安培级电流密度下实现长期碱性海水氧化

海水电解具有规模化制氢（H₂）的潜力，但氯离子（Cl-）对阳极的腐蚀仍然是一个严峻的挑战。在此，我们提出了一种泡沫镍（NiFe-PPi/NF）上的无定形焦磷酸镍铁（P2O74-），用于长期碱性海水氧化（ASO）。原位和原位表征结果表明，原位释放的 P2O74- 可作为阴离子保护层，在 ASO 过程中有效地排斥 Cl-，保护高价位活性金属位点。通过表面抗腐蚀设计，NiFe-PPi/NF 能在 1000 mA cm-2 的条件下稳定工作 1000 小时以上，且活性没有降低，只需 370 mV 的低过电位即可在碱性海水中达到这一工业电流密度。这项研究为开发 ASO 的抗腐蚀阳极提供了宝贵的策略。

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来源期刊

Materials Today Physics Materials Science-General Materials Science

CiteScore

14.00

自引率

7.80%

发文量

284

审稿时长

15 days

期刊介绍： Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.