abstract
Efficient energy storage from intermittent renewables can rely on the conversion of temporary energy excess by alkaline electrolysis, yielding oxygen and green hydrogen, which can be stored and used on demand. Electrodes made of laser-induced graphene (LIG) materials offer many advantages over the traditional graphene processing routes, due to inherent simplicity and low cost-benefit. Despite poorly studied, LIG electrodes are promising for water splitting when properly doped/modified with metals. However, proper design and processing optimization should be considered. The present study is devoted to the laser processing effects on the LIG electrode performance towards water splitting in alkaline media. Promising guidelines were obtained for hydrogen production, showing high electrochemical activity, while the microstructural degradation can be minimised by selecting suitable laser processing conditions, such as 3.6 W of laser power, 100 mm/s of laser scan rate, 36 mJ/mm of energy density and 2 laser scans.& COPY; 2022 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
keywords
HYDROGEN EVOLUTION; CATALYSTS; ELECTROCATALYSTS
subject category
Chemistry; Electrochemistry; Energy & Fuels
authors
Lopes, DV; Santos, NF; Moura, JP; Fernandes, AJS; Costa, FM; Kovalevsky, A
our authors
Andrei Kavaleuski
Principal Researcher
Daniela Vanessa Rosendo Lopes
Junior Researcher
Nuno Miguel Franco dos Santos
PhD StudentProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
The authors acknowledge the support within the projects CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & amp; UIDP/50011/2020, and LA/P/0006/2020) and i3N (LA/P/0037/2020 & amp; UIDB/50025/2020 & amp; UIDP/50025/2020) , financed by national funds through the Portuguese Foundation for Science and Technology, Portugal/MCTES. N. F. Santos thanks i3N for the BPD Grant BPD/UI96/5177/2020. The authors also gratefully acknowledge Professor Luiz Pereira and Jose Germino for the thermal evaporation procedures.