Synthesis of KOH-activated porous carbon materials and study of hydrogen adsorption

► We examine the hydrogen storage capacity of KOH activated carbon species. ► Hydrogen storage capacity is affected by micropore size. ► Around 0.9–1.3 nm micropore is suitable for hydrogen storage at ambient temperatures. ► The highest hydrogen adsorption for an activated carbon is 1.1 mass% at 303...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-12, Vol.580, p.S301-S304
Main Authors: Minoda, Ai, Oshima, Shinji, Iki, Hideshi, Akiba, Etsuo
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Carbon
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Fibers
Hydrogen storage
Materials science
Physics
Porous carbon materials
Porous materials
Porous materials
granular materials
Precursors
Raw materials
Rice
Solid surfaces and solid-solid interfaces
Solubility, segregation, and mixing
phase separation
Specific materials
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:► We examine the hydrogen storage capacity of KOH activated carbon species. ► Hydrogen storage capacity is affected by micropore size. ► Around 0.9–1.3 nm micropore is suitable for hydrogen storage at ambient temperatures. ► The highest hydrogen adsorption for an activated carbon is 1.1 mass% at 303 K/30 MPa. The authors have studied the hydrogen storage capacity of activated carbon species synthesized under various conditions of KOH activation treatment. Rice husk and PAN (Poly-acrylonitrile) fiber precursor were used as the raw materials. The activated PAN fiber carbons have larger micropore volumes than the rice husk carbons. The synthesized materials show hydrogen storage capacities that are proportional to their micropore volumes. At the same time, hydrogen storage capacity is also affected by micropore size; smaller micropores are preferable for hydrogen storage. The micropore sizes around 0.9–1.3nm is more suitable for hydrogen storage at ambient temperatures. The highest hydrogen adsorption capacity for a KOH-activated PAN fiber precursor is 1.1mass% at 303K/30MPa, while that for a KOH-activated rice husk carbon is 1.0mass% at 303K/27MPa.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.02.085