The oxygen evolution reaction is one of the most important electrochemical phenomena, especially for both its implications in energy conversion devices (electrochemical and photoelectrochemical water splitting) and for its importance in life science. Quite recently, new investigative methods based on the use of microelectrodes (the scanning electrochemical microscope and the cavity-microelectrode1,2) have opened new paths for understanding fundamental mechanisms in electrocatalysis in general, and for oxygen evolution reaction in particular. At the same time, new methods for the rapid screening and for the visualization of the experimental data have been developed and applied to different materials. The rapid screening methods are based on the use of SECM, in the sg-tc mode, by adopting the innovative “shielded tip” approach3, or by applying a pulsed potential profile at the substrate. With these methods, mixtures of SnO2-IrO2 were studied. The selection of the right material for practical applications also implies a knowledge of the candidates’ behaviour under different conditions (applied potential, pH). In this case, the collection of experimental could be in vain without an effective method of displaying them. For this reason, a new kind of 3D diagram, the dynamic potential/pH plot4 (DPPDs) is proposed for different materials. 1. Rodriguez Lopez, J.; Minguzzi, A.; Bard, A.J. J. Phys. Chem. C. 2010, 114, 18645 2. Locatelli, C.; Minguzzi, A.; Cava, P.; Vertova, A.; Rondinini, S. Anal. Chem. 2011, 83, 2819 3. Minguzzi, A.; Apulche-Aviles, M. A.; Rodriguez Lopez, J.; Rondinini, S.; Bard, A.J. Anal. Chem. 2008, 80, 4055. 4 Minguzzi, A.; Fan F.-R. F., Vertova A., Rondinini S., Bard A.J., in preparation
Electrocatalysts for oxygen evolution reaction : Innovative investigation methods for screening and mechanisms / A. Minguzzi, D. Battistel, J. Rodriguez Lopez, F.R.F. Fan, A. Vertova, S. Daniele, S. Rondinini, A.J. Bard. ((Intervento presentato al 62. convegno Annual Meeting of the International Society of Electrochemistry tenutosi a Niigata nel 2011.
Electrocatalysts for oxygen evolution reaction : Innovative investigation methods for screening and mechanisms
A. MinguzziPrimo
;A. Vertova;S. RondininiPenultimo
;
2011
Abstract
The oxygen evolution reaction is one of the most important electrochemical phenomena, especially for both its implications in energy conversion devices (electrochemical and photoelectrochemical water splitting) and for its importance in life science. Quite recently, new investigative methods based on the use of microelectrodes (the scanning electrochemical microscope and the cavity-microelectrode1,2) have opened new paths for understanding fundamental mechanisms in electrocatalysis in general, and for oxygen evolution reaction in particular. At the same time, new methods for the rapid screening and for the visualization of the experimental data have been developed and applied to different materials. The rapid screening methods are based on the use of SECM, in the sg-tc mode, by adopting the innovative “shielded tip” approach3, or by applying a pulsed potential profile at the substrate. With these methods, mixtures of SnO2-IrO2 were studied. The selection of the right material for practical applications also implies a knowledge of the candidates’ behaviour under different conditions (applied potential, pH). In this case, the collection of experimental could be in vain without an effective method of displaying them. For this reason, a new kind of 3D diagram, the dynamic potential/pH plot4 (DPPDs) is proposed for different materials. 1. Rodriguez Lopez, J.; Minguzzi, A.; Bard, A.J. J. Phys. Chem. C. 2010, 114, 18645 2. Locatelli, C.; Minguzzi, A.; Cava, P.; Vertova, A.; Rondinini, S. Anal. Chem. 2011, 83, 2819 3. Minguzzi, A.; Apulche-Aviles, M. A.; Rodriguez Lopez, J.; Rondinini, S.; Bard, A.J. Anal. Chem. 2008, 80, 4055. 4 Minguzzi, A.; Fan F.-R. F., Vertova A., Rondinini S., Bard A.J., in preparationPubblicazioni consigliate
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