Premium
Electrochemical Water Oxidation Catalysed by CoO‐Co 2 O 3 ‐Co(OH) 2 Multiphase‐Nanoparticles Prepared by Femtosecond Laser Ablation in Water
Author(s) -
Nishi Teppei.,
Hayasaka Yuichiro.,
Suzuki Tomiko. M.,
Sato Shunsuke.,
Isomura Noritake.,
Takahashi Naoko.,
Kosaka Satoru.,
Nakamura Takahiro.,
Sato Shunichi.,
Morikawa Takeshi.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800943
Subject(s) - xanes , oxygen evolution , materials science , nanoparticle , electrochemistry , catalysis , laser ablation , water splitting , laser ablation synthesis in solution , absorption (acoustics) , chemical engineering , electrochemical energy conversion , femtosecond , analytical chemistry (journal) , electrode , laser , nanotechnology , photocatalysis , chemistry , spectroscopy , laser power scaling , optics , organic chemistry , physics , quantum mechanics , x ray laser , composite material , engineering
Nanoparticle formation via laser ablation in liquid is known to produce functional materials. However, there have been few applications of this technique to the synthesis of electrochemical catalysts for energy conversion. Herein, we report the detailed effects of femtosecond laser ablation in water on the structure and activity of a catalyst intended to promote the electrochemical oxygen evolution reaction (OER) in association with water oxidation. The femtosecond laser ablation of submicron‐sized Co–CoO particles induced a drastic size reduction (from approximately 500 to 5 nm) to give highly dispersed CoO nanoparticles. X‐ray absorption near edge structure (XANES) and X‐ray diffraction (XRD) data demonstrated that these particles also contained Co 3 O 4 and CoO(OH) but not metallic Co. These 5 nm‐CoO nanoparticles showed higher mass‐based‐activity and lower over‐potential values than those of submicron‐sized Co–CoO during the OER in a nearly neutral solution. XANES data suggest that Co containing Co 2 O 3 and Co(OH) 2 formed during the OER functioned as the actual OER catalyst.