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Article

Non-Precious Electrodes for Practical Alkaline Water Electrolysis

1
Laboratoire d’Electrochimie Physique et Analytique, École Polytechnique Fédérale de Lausanne, EPFL, Valais Wallis, Rue de l’Industrie 17 Case Postale 440, CH-1951 Sion, Switzerland
2
Universidad Nacional del Litoral, CONICET, Programa de Electroquímica Aplicada e Ingeniería Electroquímica (PRELINE), Facultad de Ingeniería Química, Santiago del Estero 2829, S3000AOM Santa Fe, Argentina
*
Author to whom correspondence should be addressed.
Materials 2019, 12(8), 1336; https://doi.org/10.3390/ma12081336
Received: 4 April 2019 / Revised: 16 April 2019 / Accepted: 19 April 2019 / Published: 24 April 2019
Water electrolysis is a promising approach to hydrogen production from renewable energy sources. Alkaline water electrolyzers allow using non-noble and low-cost materials. An analysis of common assumptions and experimental conditions (low concentrations, low temperature, low current densities, and short-term experiments) found in the literature is reported. The steps to estimate the reaction overpotentials for hydrogen and oxygen reactions are reported and discussed. The results of some of the most investigated electrocatalysts, namely from the iron group elements (iron, nickel, and cobalt) and chromium are reported. Past findings and recent progress in the development of efficient anode and cathode materials appropriate for large-scale water electrolysis are presented. The experimental work is done involving the direct-current electrolysis of highly concentrated potassium hydroxide solutions at temperatures between 30 and 100 °C, which are closer to industrial applications than what is usually found in literature. Stable cell components and a good performance was achieved using Raney nickel as a cathode and stainless steel 316L as an anode by means of a monopolar cell at 75 °C, which ran for one month at 300 mA cm−2. Finally, the proposed catalysts showed a total kinetic overpotential of about 550 mV at 75 °C and 1 A cm−2. View Full-Text
Keywords: Alkaline water electrolysis; Raney-Ni; stainless steel 316; equilibrium potential; water splitting; iR correction Alkaline water electrolysis; Raney-Ni; stainless steel 316; equilibrium potential; water splitting; iR correction
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MDPI and ACS Style

Colli, A.N.; Girault, H.H.; Battistel, A. Non-Precious Electrodes for Practical Alkaline Water Electrolysis. Materials 2019, 12, 1336. https://doi.org/10.3390/ma12081336

AMA Style

Colli AN, Girault HH, Battistel A. Non-Precious Electrodes for Practical Alkaline Water Electrolysis. Materials. 2019; 12(8):1336. https://doi.org/10.3390/ma12081336

Chicago/Turabian Style

Colli, Alejandro N., Hubert H. Girault, and Alberto Battistel. 2019. "Non-Precious Electrodes for Practical Alkaline Water Electrolysis" Materials 12, no. 8: 1336. https://doi.org/10.3390/ma12081336

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