Hydrogen adsorption with micro-structure deformation in nanoporous carbon under ultra-high pressure

• Published in: International journal of hydrogen energy Vol. 47; no. 81; pp. 34555 - 34569
• Main Authors: Li, Heng, Komatsu, Keiji, Tsuda, Yoshinori, Saitoh, Hidetoshi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 22.09.2022
• Subjects: Cold isostatic pressing; Hydrogen encapsulation/storage; Nanoporous carbon; Pore size; Ultra-high pressure; Hydrogen encapsulation/storage; Cold isostatic pressing; Pore size; Ultra-high pressure; Nanoporous carbon
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.08.030

Hydrogen adsorption with micro-structure deformation under ultra-high pressure in nanoporous carbon (NPC) has been studied. This study proposed a new ultra-high pressurization (UHP) method. It produces a gas atmosphere of over 100 MPa utilizing the cold isostatic pressing (CIP) device. NPC materials were pressurized under a hydrogen atmosphere at 100–400 MPa. NPC fabricated from rice husk via KOH activation possesses a high surface area achieving 3500 cm2/g and a micropore volume of over 2.0 cm3/g. The maximum hydrogen uptake reached 3.2 wt% (77 K, 0.1 MPa). Then, NPC materials were treated with 100–400 MPa pressurization in the hydrogen atmosphere. NPC showed a preferred deformation behavior of 1.1–1.2 nm after pressurization, which is the optimum size for hydrogen adsorption. Additionally, the maximum micropore volume increased to 2.51 cm3/g. However, the hydrogen uptake shows a slight decrease to 3.0 wt%. The isosteric heat of adsorption maintained at 8.0–10.3 kJ/mol. [Display omitted] •New ultra-high pressurization (UHP) method was proposed utilizing a cold isostatic pressing device.•Pore size distribution of nanoporous carbon (NPC) after pressurization was investigated.•Pore size distribution of NPC deformed after pressurization by (UHP).