Peritectic and incongruent equilibrium during surface electro-oxidation of C-276 Hastelloy for rapid fabrication of urea-assisted water-splitting anode

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-02-25 DOI:10.1016/j.scriptamat.2025.116623

Li Lin , Jia Yu , Panpan Lv, Andong Song, Lijia Chen

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Abstract

An anodic hetero-structure combining both electrocatalysis and electricity-conduction was obtained by simple surface electro-oxidation of C-276 Hastelloy to facilitate urea oxidation reaction (UOR) for water-splitting. The inactive and insulative Ni(OH)₂, as the direct evidence of poisoning effect, was completely inhibited by the peritectic precipitation of NiFe₂O₄, which is identified as the pre-catalyst for UOR under the indirect or regeneration mechanism. The core-shell structure composed of the inner Ni(OH)₂/NiCO₃ and the outer NiFe₂O₄ suffered the subsequent incongruent decomposition of surface layer to form the more stable and active Ni-based oxyhydroxides as the real-time electrocatalyst. Cr and Mo elements were found to be converted easily into CrOOH and MoO₃ or MoC with stable relative ratios during surface electro-oxidation. The outstanding UOR performance of as-prepared hetero-structure is related to the predominance of NiOOH and the elimination of poisoning effect, as a result of the simultaneous equilibrium among all UOR-enhancing species.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.