Enhanced hydrogen storage by a variable temperature process. (5th February 2019)

• Record Type: Journal Article
• Authors: Cansizoglu, Mehmet F.; Badradeen, Emad; Wang, Gwo-Ching; Karabacak, Tansel
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 7(2019)
• Page Start: 3771
• Page End: 3778
• Publication Date: 2019-02-05
• Subjects: Hydrogen storage -- Magnesium -- QCM -- Glancing angle deposition -- GLAD -- Variable temperature process; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.12.087
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: We present a simple method of variable temperature process that can potentially enhance the hydrogen storage properties of a large variety of solid state materials. In this approach, hydrogen gas is first introduced at about room temperature, which is followed by a gradual increase to a preset maximum temperature value, Tmax . Using this approach, we investigated hydrogen absorption properties of vertically aligned arrays of magnesium nanotrees and nanoblades fabricated by glancing angle deposition (GLAD) technique, and conventional Mg thin film. Weight percentage (wt%) storage values were measured by quartz crystal microbalance (QCM). After exposing Mg samples to H2 at 30 bar and 30 °C, dynamic absorption measurements were conducted as the temperature was increased from 30 °C to maximum values of Tmax = 100, 200, and 300 ° C all within 150 min. QCM measurements revealed that variable temperature method results in significant improvements in hydrogen storage values over the ones obtained by conventional constant temperature process. At a low effective temperature Teff = 165 °C (Tmax = 300 °C), we achieved storage values of 6.19, 4.76, and 2.79 wt% for Mg nanotrees, nanoblades, and thin film, respectively. Graphical abstract: Highlights: A new variable temperature process was developed to enhance hydrogen storage. Mg nanoblades and nanotrees were fabricated by glancing angle deposition (GLAD). Hydrogen absorption and desorption properties were investigated using QCM. Hydrogen storage rates were enhanced when variable temperature process was used.