Solar saline water splitting is a promising approach to sustainable hydrogen production, harnessing abundant solar energy and the availability of brine resources, especially in the Atacama Desert. Bischofite salt (MgCl2<middle dot>6H2O) has garnered significant attention due to its wide range of industrial applications. Efficient hydrogen production in arid or hyper arid locations using bischofite solutions is a novel and revolutionary idea. This work studied the electrochemical performance of Mn2O3 electrodes using a superposition model based on mixed potential theory and evaluated the superficial performance of this electrode in contact with a 0.5 M bischofite salt solution focusing on the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) that occur during saline water splitting. The application of the non-linear superposition model provides valuable electrochemical kinetic parameters that complement the understanding of Mn2O3, this being one of the novelties of this work. C1 [Galleguillos-Madrid, Felipe M.; Salazar-Avalos, Sebastian; Fuentealba, Edward; Leiva-Guajardo, Susana; Portillo, Carlos] Univ Antofagasta, Ctr Desarrollo Energet Antofagasta, Antofagasta 1240000, Chile. [Caceres, Luis] Univ Antofagasta, Dept Ingn Quim & Proc Minerales, Ave Univ Antofagasta 02800, Antofagasta 1271155, Chile. [Sepulveda, Felipe] Univ Antofagasta, Dept Ingn Minas, Antofagasta 1240000, Chile. [Brito, Ivan] Univ Antofagasta, Fac Ciencias Bas, Dept Quim, Antofagasta 1240000, Chile. [Cobos-Murcia, Jose Angel] Univ Autonoma Estado Hidalgo, Inst Ciencias Bas Ingn, Carr Pachuca Tulancingo Km 4-5, Hidalgo 42184, Mexico. [Rojas-Moreno, Omar F.] Univ Antonio Narino, Fac Mech Elect & Biomed Engn, Tunja 150002, Colombia. [Jimenez-Arevalo, Victor] Univ Santiago de Chile, Fac Quim & Biol, Dept Quim Mat, Ave Libertador B OHiggins 3363, Santiago 9170022, Chile. [Schott, Eduardo] Pontificia Univ Catolica Chile, Fac Quim & Farm, Ctr Invest Nanotecnol & Mat Avanzados CIEN UC, Ctr Energia UC,Dept Quim Inorgan, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile. [Soliz, Alvaro] Univ Atacama, Dept Ingn Met, Ave Copayapu 485, Copiapo 1530000, Chile. C3 Universidad de Antofagasta; Universidad de Antofagasta; Universidad de Antofagasta; Universidad de Antofagasta; Universidad Autonoma del Estado de Hidalgo; Universidad Antonio Narino; Universidad de Santiago de Chile; Pontificia Universidad Catolica de Chile; Universidad de Atacama