Synthesis of Hydrous Ruthenium Oxide Nanoparticles in Sub- and Supercritical Water and Their Capacitive Properties

Title
Synthesis of Hydrous Ruthenium Oxide Nanoparticles in Sub- and Supercritical Water and Their Capacitive Properties
Authors
안토니우스아궁이홍식백성민정경윤민병권김재훈
Keywords
Ruthenium oxide; Supercritical water; Supercapacitor
Issue Date
2014-10
Publisher
Chemical engineering communications
Citation
VOL 201, NO 10, 1259-1269
Abstract
Hydrous ruthenium oxide (RuO2ㆍ nH2O) nanoparticles with various particle sizes and water contents were synthesized in sub- and supercritical water in a very short reaction time of 15 min. The particle size, surface area, morphology, crystalline structure, and electrochemical properties were analyzed and compared with those of commercial RuO2 particles. Ultrafine spherical RuO2ㆍ0.6H2O nanoparticles with an average size of 4.2 nm were produced in subcritical water (250℃, 300 bar), while larger and more highly crystalline rod-shaped RuO2ㆍ(0.3–0.5)H2O particles were produced in supercritical water (400 ℃, 300 bar). The use of NaOH under the supercritical water conditions resulted in a decrease in particle size. The hydrous RuO2 nanoparticles synthesized in subcritical water exhibited a much higher specific capacitance (255 F g- 1) at a scan rate of 10mVs 1 than those synthesized in supercritical water (77 F g- 1) and commercial RuO2 (8 F g- 1).
URI
http://pubs.kist.re.kr/handle/201004/47706
ISSN
00986445
Appears in Collections:
KIST Publication > Article
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