Hoa Thi Bui Ahn, Do Young Shrestha, Nabeen K. Sung, Myung M. Lee, Joong Kee Han, Sung-Hwan 2024-01-20T04:01:40Z 2024-01-20T04:01:40Z 2021-09-03 2016-07 2050-7488 https://pubs.kist.re.kr/handle/201004/123934 The present study reports a facile synthetic route for thin film formation of a self-standing 1-D structured array of cobalt hexacyanoferrate crystals using an aqueous solution based ion exchange transformation approach. For this, the cobalt hydroxycarbonate 1-D structured array film was used as a sacrificial precursor template for the ion exchange reaction in aqueous K-3[Fe(CN)(6)] solution. By controlling the reaction, 1-D structured array film, or particulate structured film of the cobalt hexacyanoferrate crystals could be obtained, which thus offered possibilities on morphology-dependent property engineering. The films before and after the ion exchange reaction were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometry, energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). Further, electrochemical study of the films was performed using voltammetry, and electrochemical impedance spectroscopy. The study reveals the morphology-dependent electrocatalytic property of the cobalt hexacyanoferrate crystal film on water-oxidation. The 1-D structured array film of the cobalt hexacyanoferrate crystals has demonstrated superior electrocatalytic performance on water-oxidation from alkaline and neutral electrolytes, which is competitive to the catalytic performance demonstrated by many outstanding water-oxidation catalysts. English ROYAL SOC CHEMISTRY OXYGEN EVOLUTION CATION-EXCHANGE ELECTRODES GRAPHENE CATALYST FILM Self-assembly of cobalt hexacyanoferrate crystals in 1-D array using ion exchange transformation route for enhanced electrocatalytic oxidation of alkaline and neutral water Article 10.1039/c6ta03436e 1 JOURNAL OF MATERIALS CHEMISTRY A, v.4, no.25, pp.9781 - 9788 JOURNAL OF MATERIALS CHEMISTRY A 4 25 9781 9788 scie scopus 000378716900010 2-s2.0-84976364034 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article OXYGEN EVOLUTION CATION-EXCHANGE ELECTRODES GRAPHENE CATALYST FILM Self-assembly cobalt hexacyanoferrate crystals 1-D array ion exchange transformation route electrocatalytic oxidation