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A Proof of Principle for the Phase-Dependent Electrocatalytic Activity of NiTi Shape Memory Alloys for the Oxygen Evolution Reaction
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DOI：10.1002/celc.202500467.png)
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Abstract
En 中文
Nickel–titanium (NiTi) shape memory alloys are intermetallic compounds that can exhibit a reversible martensitic phase transformation. While extensively studied for biomedical and actuator applications, their potential as electrocatalysts for the oxygen evolution reaction (OER) remains virtually unexplored. Here, we systematically investigate how phase structure influences OER activity in NiTi alloys by comparing martensite Ni50Ti50 (B19’ monoclinic) and austenite Ni51.2Ti48.8 (B2 cubic). Despite differing by only 1.2 at.% Ni, the investigated specimens exhibit markedly different electrocatalytic behavior. In 1 M KOH containing 15 ppb Fe, the martensitic phase requires 40 mV lower overpotential (450 vs. 490 mV at 10 mA cm−2) and maintains stable operation at 1.56 V vs. RHE for 12 h. This improved activity correlates with phase-dependent properties: enhanced electrical conductivity, finer surface texture, and markedly increased hydrophilicity (contact angle 21° vs. 71°). The martensitic phase also shows a 10% larger electrochemically active surface area. Under elevated Fe levels (150 ppb), the martensite phase undergoes stronger surface restructuring and achieves a 370 mV lower overpotential, indicating superior Fe incorporation. These findings demonstrate that OER performance in NiTi alloys is systematically tunable via microstructural states, establishing phase engineering as a promising strategy for designing next-generation water-splitting electrocatalysts.
Keywords:
alkaline water electrolysis
martensitic transformation
microstructure
NiTi shape memory alloys
oxygen evolution reaction
phase engineering
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