Energies | Top 10 Downloaded Articles in 2021

1. “Fuel Cell Electric Vehicles—A Brief Review of Current Topologies and Energy Management Strategies”
Ioan-Sorin Sorlei et al.
Energies 2021, 14(1), 252; 10.3390/en14010252
Available online: http://www.mdpi.com/1996-1073/14/1/252

2. “Critical Review of Flywheel Energy Storage System”
Abdul Ghani Olabi et al.
Energies 2021, 14(8), 2159; 10.3390/en14082159
Available online: http://www.mdpi.com/1996-1073/14/8/2159

3. “Methane Cracking for Hydrogen Production: A Review of Catalytic and Molten Media Pyrolysis”
Malek Msheik et al.
Energies 2021, 14(11), 3107; 10.3390/en14113107
Available online: https://www.mdpi.com/1996-1073/14/11/3107

4. “Impact of COVID19 on Operational Activities of Manufacturing Organizations—A Case Study and Industry 4.0-Based Survive-Stabilise-Sustainability (3S) Framework”
Mutahhar A. Dar et al.
Energies 2021, 14(7), 1900; 10.3390/en14071900
Available online: https://www.mdpi.com/1996-1073/14/7/1900

5. “Energy Sector Risk and Cost of Capital Assessment—Companies and Investors Perspective”
Justyna Franc-Dąbrowska et al.
Energies 2021, 14(6), 1613; 10.3390/en14061613
Available online: https://www.mdpi.com/1996-1073/14/6/1613

6. “Refrigeration of COVID-19 Vaccines: Ideal Storage Characteristics, Energy Efficiency and Environmental Impacts of Various Vaccine Options”
Alexandre F. Santos et al.
Energies 2021, 14(7), 1849; 10.3390/en14071849
Available online: https://www.mdpi.com/1996-1073/14/7/1849

7. “Cryptocurrency Mining from an Economic and Environmental Perspective. Analysis of the Most and Least Sustainable Countries”
Sergio Luis Náñez Alonso et al.
Energies 2021, 14(14), 4254; 10.3390/en14144254
Available online: https://www.mdpi.com/1996-1073/14/14/4254

8. “End of Electric Vehicle Batteries: Reuse vs. Recycle”
Yash Kotak et al.
Energies 2021, 14(8), 2217; 10.3390/en14082217
Available online: https://www.mdpi.com/1996-1073/14/8/2217

9. “Tourism in the Era of Covid-19 and Its Impact on the Environment”
Rafał Nagaj et al.
Energies 2021, 14(7), 2000; 10.3390/en14072000
Available online: https://www.mdpi.com/1996-1073/14/7/2000

10. “A Theoretical Framework for Industry 4.0 and Its Implementation with Selected Practical Schedules”
Bożena Gajdzik et al.
Energies 2021, 14(4), 940; 10.3390/en14040940
Available online: https://www.mdpi.com/1996-1073/14/4/940