Suitability Evaluation of LaNi5 as Hydrogen-Storage-Alloy Actuator by In-Situ Displacement Measurement during Hydrogen Pressure Change

Abstract

The swelling ability of LaNi5 for application to hydrogen-storage-alloy (HSA) actuator is discussed through the measurement of the swelling ratio in hydrogen. The HSA actuator is driven by hydrogen pressure change causing the swelling of HSA. LaNi5 is one of the candidate materials for HSA actuators as well as palladium. Some prototypes of HSA actuators using LaNi5 have been fabricated; however, the kinetic swelling ability of LaNi5 itself has been not investigated. In this paper, the authors investigated the static and kinetic swelling ability of LaNi5 powder under hydrogen atmosphere. The results showed that the swelling ratio increased by 0.12 at the phase transition pressure. Response time decreased with an increase in the charged pressure during absorption, while it remained constant during discharge. Reaction kinetics revealed that these swelling behaviors were explained by hydrogen absorption and lattice expansion. The swelling ability of LaNi5 was also compared with that of palladium. The results show that LaNi5 swells 1.8 times more than palladium under 0.5 MPa. LaNi5 is suitable for an actuator driven repeatedly under more than the phase transition pressure. Palladium can be used for one-way-operation actuator even under 0.1 MPa since its response time during the evacuation was much longer than during the pressurization.

Materials Research Directions Toward a Green Hydrogen Economy: A Review

“… 111 LaNi 5 -based alloys have been used in practical applications because of their stable reversible hydrogen absorption and desorption reactions under moderate conditions (i.e., room temperature and hydrogen gas pressure less than 10 bar). 112 Recently, a new promising class of H 2 storage alloys, TiZrNbFeNi high-entropy alloys (HEAs), has been discovered. 113 The presence of lattice strain in the HEA distorted crystal structure can be beneficial to store hydrogen.…”

“…Magnesium-based alloys such as Mg 2 Ni have the most promising hydrogen storage properties; intermetallic compounds such as TiFe and LaNi 5 have good hydrogen storage reversibility . LaNi 5 -based alloys have been used in practical applications because of their stable reversible hydrogen absorption and desorption reactions under moderate conditions (i.e., room temperature and hydrogen gas pressure less than 10 bar) . Recently, a new promising class of H 2 storage alloys, TiZrNbFeNi high-entropy alloys (HEAs), has been discovered .…”

Impact of Polymers on Magnesium-Based Hydrogen Storage Systems

“…In physical-based hydrogen storage systems, hydrogen can be stored in three categories: compressed gas, cold/cryo compressed and liquid hydrogen [7,51,52]. In material-based hydrogen storage systems, the hydrogen stored in various categories such as adsorbent (e.g., metal-organic framework) [53][54][55], liquid organic [56][57][58] (e.g., BN-methyl cyclopentane), interstitial hydride (e.g., LaNi 5 H 6 ) [59,60], elemental hydride (e.g., MgH 2 ) [61][62][63][64], complex hydride (e.g., NaAlH 4 ) [65][66][67] and chemical hydrogen (NH 3 BH 3 ) [7,51,[68][69][70] (Hydrogen Storage, Hydrogen and Fuel Cell Technologies Office, US-DOE-https://www.energy.gov/eere/ fuelcells/hydrogen-storage, accessed on 2 April 2022). Pressurized hydrogen gas is commonly used in various applications in the present scenario.…”

A Cd(ii)-organic framework as a highly sensitive and rapid fluorometric sensor for ascorbic acid in aqueous medium

“…So far, plenty of techniques for detection of AA have been well-known including spectrophotometry, electrochemistry, chromatography, enzymology, capillary electrophoresis etc. [12][13][14][15] However, easier, sensitive and effective methods for determining AA in food samples are still highly attractive. The fluorescence method has its characteristic advantages like easy operation, high sensitivity and fast response.…”