Energies | Highly Cited Papers in the “Hydrogen Energy” Section in 2025

1. “Green Hydrogen for Energy Transition: A Critical Perspective”
by Ruggero Angelico, Ferruccio Giametta Biagio Bianchi and Pasquale Catalano
Energies 2025, 18(2), 404; https://doi.org/10.3390/en18020404
Available online: https://www.mdpi.com/1996-1073/18/2/404

2. “Underground Hydrogen Storage: Transforming Subsurface Science into Sustainable Energy Solutions”
by Kwamena Opoku Duartey, William Ampomah, Hamid Rahnema and Mohamed Mehana
Energies 2025, 18(3), 748; https://doi.org/10.3390/en18030748
Available online: https://www.mdpi.com/1996-1073/18/3/748

3. “Mechanisms and Modelling of Effects on the Degradation Processes of a Proton Exchange Membrane (PEM) Fuel Cell: A Comprehensive Review”
by Krystof Foniok, Lubomira Drozdova, Lukas Prokop, Filip Krupa, Pavel Kedron and Vojtech Blazek
Energies 2025, 18(8), 2117; https://doi.org/10.3390/en18082117
Available online: https://www.mdpi.com/1996-1073/18/8/2117

4. “Review of Environmental Life Cycle Assessment for Fuel Cell Electric Vehicles in Road Transport”
by Dorota Burchart and Iga Przytuła
Energies 2025, 18(5), 1229; https://doi.org/10.3390/en18051229
Available online: https://www.mdpi.com/1996-1073/18/5/1229

5. “Challenges and Opportunities of the Dynamic Operation of PEM Water Electrolyzers”
by Balázs Endrődi, Cintia Alexandra Trapp, István Szén, Imre Bakos, Miklós Lukovics and Csaba Janáky
Energies 2025, 18(9), 2154; https://doi.org/10.3390/en18092154
Available online: https://www.mdpi.com/1996-1073/18/9/2154

6. “Assessment of Hydrogen Storage and Pipelines for Hydrogen Farm”
by Esmaeil Alssalehin, Paul Holborn and Pericles Pilidis
Energies 2025, 18(5), 1167; https://doi.org/10.3390/en18051167
Available online: https://www.mdpi.com/1996-1073/18/5/1167

7. “Research Trends in Underground Hydrogen Storage: A Bibliometric Approach”
by Barbara Uliasz-Misiak, Agnieszka Nowak and Dariusz Janczak
Energies 2025, 18(7), 1845; https://doi.org/10.3390/en18071845
Available online: https://www.mdpi.com/1996-1073/18/7/1845

8. “Artificial Neural Networks as a Tool for High-Accuracy Prediction of In-Cylinder Pressure and Equivalent Flame Radius in Hydrogen-Fueled Internal Combustion Engines”
by Federico Ricci, Massimiliano Avana and Francesco Mariani
Energies 2025, 18(2), 299; https://doi.org/10.3390/en18020299
Available online: https://www.mdpi.com/1996-1073/18/2/299

9. “Non-Renewable and Renewable Exergy Costs of Water Electrolysis in Hydrogen Production”
by Alessandro Lima, Jorge Torrubia, Alicia Valero and Antonio Valero
Energies 2025, 18(6), 1398; https://doi.org/10.3390/en18061398
Available online: https://www.mdpi.com/1996-1073/18/6/1398

10. “Performance Improvement of Proton Exchange Membrane Fuel Cells with a TiO₂ Sputtered Gas Diffusion Layer Under Low-Humidity Conditions”
by Byung Gyu Kang, Ye Rim Kwon, Ki Won Hong, Sun Ki Kwon, Hyeon Min Lee, Dong Kun Song, Ji Woong Jeon, Do Young Jung, Dohyun Go and Gu Young Cho
Energies 2025, 18(6), 1525; https://doi.org/10.3390/en18061525
Available online: https://www.mdpi.com/1996-1073/18/6/1525