Boosting Electrochemical Water Oxidation with Metal Hydroxide Carbonate Templated Prussian Blue Analogues. Issue 5 (28th December 2017)

• Record Type: Journal Article
• Authors: Indra, Arindam; Paik, Ungyu; Song, Taeseup
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 5(2018)
• Page Start: 1241
• Page End: 1245
• Publication Date: 2017-12-28
• Subjects: electrocatalysts -- layered hydroxides -- Prussian blue analogues -- templated synthesis -- water oxidation; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201710809
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The development of efficient and stable catalyst systems with low‐cost, abundant, and non‐toxic materials is the primary demand for electrochemical water oxidation. A unique method is reported for the syntheses of metal hydroxide carbonate templated Prussian blue analogues (PBAs) on carbon cloth and their outstanding water oxidation activities in alkaline medium. The best water oxidation activity is obtained with cobalt hydroxide carbonate templated t‐Co II ‐Co III with an overpotential as low as 240 mV to reach a current density of 10 mA cm −2 . It produces constant current over 50 h in chronoamperometric measurements. Moreover, the catalysts outperform the activities of the PBAs prepared without any template and even the noble metal catalyst RuO2 . Spectroscopic and microscopic studies show that the PBAs are transformed into layered hydroxide–oxyhydroxide structures during electrochemical process and provide the active sites for the water oxidation. Abstract : Best couple : The electrochemical water oxidation activity of Prussian blue analogues is dramatically improved when metal hydroxide carbonate was used as the template. The best water oxidation activity is obtained with cobalt hydroxide carbonate, with an overpotential as low as 240 mV to reach a current density of 10 mA cm −2 . It produces constant current over 50 h.