Enhanced hydrogen storage performance of La–Ti alloy metal hydrides via hot pressing and hydrothermal carbonization: A structure–property–uptake correlation study

YILMAZ A. C., ERDEM YILMAZ Ö., ÇOŞGUN A.

Journal of Alloys and Compounds, cilt.1048, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1048
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.jallcom.2025.185192
  • Dergi Adı: Journal of Alloys and Compounds
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Public Affairs Index
  • Anahtar Kelimeler: Hot pressing, Hydrogen storage, Hydrothermal carbonization, La–Ti alloy metal hydride
  • Akdeniz Üniversitesi Adresli: Evet

Özet

This study explores an innovative approach to improving hydrogen storage in lanthanum-titanium (La–Ti) alloy hydrides by combining nanopowder (NP) synthesis, hot pressing, and hydrothermal carbonization (HTC). Initially, “La–Ti” NP synthesized via co-precipitation demonstrated moderate hydrogen uptake (∼0.65 wt%) due to their nanoscale structure and moderate surface area (∼22 m²/g). Subsequent hot pressing transformed the NP into dense discs (DS), enhancing mechanical properties (compressive strength ∼410 MPa; Vickers hardness ∼220 HV) and slightly increasing hydrogen storage to 0.81 wt%. To further boost hydrogen capacity, discs were surface-functionalized by HTC (DS-HTC), forming a uniform porous hydrochar coating approximately 1.25 µm thick, significantly increasing surface area (∼98 m²/g). This modification greatly improved hydrogen uptake to 1.78 wt% while enhancing mechanical integrity (compressive strength ∼445 MPa; hardness ∼235 HV). Overall, this integrated synthesis–processing approach provides a promising pathway to develop structurally robust, high-performance metal hydrides for practical solid-state hydrogen storage applications.