Investigation of the Hydrogen Storage Performance of the LaNi₅ Alloy

Öz

The hydrogen storage performance of LaNi₅ was systematically investigated under different pressure conditions. Hydrogen absorption experiments using LaNi₅ were conducted at hydrogen pressures of 10, 20, and 30 bar. Structural and morphological characterizations were carried out using Raman spectroscopy, XRD, SEM, and BET surface area analyses. Raman results indicated that the main LaNi₅ phase was preserved after hydrogen absorption, while the formation of La₂O₃ on the surface increased. The crystallite size of pristine LaNi₅ and hydrogen-absorbed LaNi₅ was found to increase from 8.9 nm to 10.10 nm after hydrogenation. SEM and BET analyses revealed that LaNi₅ exhibits a heterogeneous grain morphology with a specific surface area of 2.77 m²/g. The hydrogen storage capacity was measured as 0.8 wt% at 10 bar, 1.2 wt% at 20 bar, and 1.4 wt% at 30 bar. The obtained results demonstrate that increasing pressure accelerates hydrogen diffusion into the metal lattice and promotes hydride phase formation. The study confirms the safe and reversible hydrogen storage potential of LaNi₅ under near-room-temperature conditions and provides important insights for performance optimization in pressure-controlled systems.

Anahtar Kelimeler

• LaNi5;
• Hydrogen Storage;
• Pressure.

Etik Beyan

The article which information is given above and submited to ADYU J SCI does not require ethics committee permission or any special permission.

LaNi₅ Alaşımının Hidrojen Depolama Performansının İncelenmesi

Öz

Çalışmada, LaNi₅’in hidrojen depolama performansı farklı basınç koşulları altında sistematik olarak incelenmiştir. LaNi₅ yapısı kullanılarak gerçekleştirilen hidrojen absorbsiyon çalışmaları 10, 20 ve 30 bar hidrojen basıncı altında gerçekleştirilmiştir. Yapısal ve morfolojik karakterizasyon Raman spektroskopisi, XRD, SEM ve BET yüzey alanı analizleri ile gerçekleştirilmiştir. Raman sonuçları hidrojen absorpsiyonu sonrası LaNi₅ ana fazının korunduğunu, ancak yüzeyde La₂O₃ oluşumunun arttığını göstermiştir. LaNi5’e ve hidrojen absorbe edilen LaNi5 ait kristal boyutunun hidrojenleme sonrası 8.9 nm’den 10.10 nm’ye yükseldiği belirlenmiştir. SEM ve BET analizleri ile LaNi₅’in heterojen tane morfolojisine sahip olduğu ve özgül yüzey alanı 2.77 m²/g belirlenmiştir. Hidrojen depolama kapasitesi 10 bar’da %0.8 wt, 20 bar’da %1.2 wt ve 30 bar’da %1.4 wt olarak ölçülmüştür. Elde edilen sonuçlar, artan basıncın hidrojenin metal kafesine difüzyonunu hızlandırdığını ve hidrit faz oluşumunu desteklediğini göstermektedir. Çalışma, LaNi₅’in oda sıcaklığına yakın koşullarda güvenli ve tersinir hidrojen depolama potansiyelini doğrulamakta olup, basınç kontrollü sistemlerde performans optimizasyonu açısından önemli bulgular sunmaktadır.

Anahtar Kelimeler

• LaNi5;
• Hidrojen Depolama;
• Basınç.

Etik Beyan

Yukarıda bilgileri verilen ve ADYU J SCI'ye gönderilen makale, etik kurul onayına veya herhangi bir özel izne ihtiyaç duymamaktadır.

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