Potential Use of Waste in Electrocatalysis Using Foundry Sand as Electrocatalyst for the Hydrogen Evolution Reaction
Chubraider Xavier,
Galo Ramírez,
Maurício Isaacs,
Caue Ribeiro,
Eduardo B. Azevedo,
Rodrigo delRio Quero
Affiliations
Chubraider Xavier
Chemistry Institute of São Carlos (IQSC), University of São Paulo (USP) , Avenida Trabalhador São-Carlense, São Paulo, 13560-970, Brazil
Galo Ramírez
Facultad de Química y Farmacia, Millenium Institute on Green Ammonia as Energy Vector (MIGA), Pontificia Universidad Católica de Chile (PUC), Macul, Santiago, Chile
Maurício Isaacs
Facultad de Química y Farmacia, Millenium Institute on Green Ammonia as Energy Vector (MIGA), Pontificia Universidad Católica de Chile (PUC), Macul, Santiago, Chile
Caue Ribeiro
Embrapa Instrumentation—Brazilian Agricultural Research Corporation, São Paulo, 13560-970, Brazil
Eduardo B. Azevedo
Chemistry Institute of São Carlos (IQSC), University of São Paulo (USP) , Avenida Trabalhador São-Carlense, São Paulo, 13560-970, Brazil
Facultad de Química y Farmacia, Millenium Institute on Green Ammonia as Energy Vector (MIGA), Pontificia Universidad Católica de Chile (PUC), Macul, Santiago, Chile
Approximately 13 million tons of foundry sand (FS), a waste from the metallurgic industry, are produced worldwide annually. Although several applications for this waste have been reported, there is a lack of research regarding its application in energy production, such as the hydrogen evolution reaction (HER). Due to several metal oxides commonly present in this waste, like iron oxides, FS may have great potential for HER. Simple carbon-paste electrodes comprised of graphite and FS were prepared and tested for HER. FS, after thermal treatment, showed an onset potential near +0.39 V vs Reversible Hydrogen Electrode and a current density of approximately 16 mA cm ^‒2 at ‒0.9 V. HER geometric rate, turnover number (TON), and faradaic efficiency were 1.77 μ mol h ^‒1 cm ^‒2 , 3126, and 43.4%, respectively. Those are reasonable values compared to the ones reported in the literature, showing the potential of this waste for the manufacturing of low-cost electrodes.
