Zn-doped LaCoO3 thin film electrode for water oxidation

Surassawatee Jamikorn^a, Weera Suanthaisong^a, Atchana Wongchaisuwat^a, Attera Worayingyong^b, Marisa Arunchaiya^b, Voranuch Somsongkul^c

^aDepartment of Chemistry, Kasetsart University, Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900 Thailand, Thailand

^bDepartment of Materials Science, Kasetsart University, Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900 Thailand, Thailand

^cDepartment of Industrial Chemistry, King Mongkut’s University of Technology North Bangkok, Department of Industrial Chemistry, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800 Thailand, Thailand

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Weera Suanthaisong, 382
Publication date: 5th February 2015

Perovskites (ABO₃ structure) are promising candidates for both photoanodes and photocathodes, since their electronic properties can be tailored by substituting the A or B site cations without strong perturbation of the crystal structure [1]. In this work, LaCoO₃and Zn-doped LaCoO₃perovskites were prepared by citrate method [2] and were characterized by X-ray diffraction and scanning electron microscopy. The current-potential curves obtained from a three-electrode cell with LaCoO₃or LaCo_0.9Zn_0.1O₃film electrodes as working electrodes, platinum as counter electrode and Ag/AgCl as reference electrode in 1 M Na₂SO₄aqueous solution at pH 2 showed a potential shift of 0.11 volt from 1.48 volt of LaCoO₃to 1.37 volt of LaCo_0.9Zn_0.1O₃. The potential of LaCo_0.9Zn_0.1O₃film electrode shifted to less positive side compared to LaCoO₃film electrode is indicative of a more favorable for the oxygen evolution reaction. The water splitting experiment was performed for two hours by using LaCo_0.9Zn_0.1O₃thin film (1 cm²active area) as n-type semiconductor electrode and platinized platinum on FTO glass (1 cm²active area) as counter electrode in 1 M Na₂SO₄electrolyte at a constant potential of 2 volts. The measured hydrogen and oxygen volumes were 0.4 ml and 0.2 ml, respectively whereas the yields from two platinized platinum electrodes (1 cm²active area) were 0.2 ml and 0.1 ml, respectively. Furthermore the LaCo_0.9Zn_0.1O₃film electrode showed good and stable performance through the two hours of water splitting experiment. Under similar experimental conditions, no oxygen evolution reaction was observed from the LaCoO₃film electrode.

[1] Meda, L.; Abbondanza, L. Materials for Photo-Electrochemical Water Splitting. Rev. Adv. Sci. Eng. 2013, 2, 200 – 207. [2] Fei, M.; Wei, C.; Lihong, H.; Xiaopeng, Y.; Yongyong, W.Steam Reforming of Ethanol over Zn-Doped LaCoO3 Perovskite Nanocatalysts. Chin. J. Catal. 2011, 32, 970–977.

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