1. “Application of Ionic Liquids for Batteries and Supercapacitors”
by Ray, A. and Saruhan, B.
Materials 2021, 14(11), 2942; https://doi.org/10.3390/ma14112942
Full text available online: https://www.mdpi.com/1996-1944/14/11/2942

2. “Research Progress of Proton Exchange Membrane Failure and Mitigation Strategies”
by Xing, Y.; Li, H. and Avgouropoulos, G.
Materials 2021, 14(10), 2591; https://doi.org/10.3390/ma14102591
Full text available online: https://www.mdpi.com/1996-1944/14/10/2591

3. “Ionic Liquid Electrolytes for Electrochemical Energy Storage Devices”
by Kim, E.; Han, J.; Ryu, S.; Choi, Y. and Yoo, J.
Materials 2021, 14(14), 4000; https://doi.org/10.3390/ma14144000
Full text available online: https://www.mdpi.com/1996-1944/14/14/4000

4. “Undoped Sr₂MMoO₆ Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells”
by Skutina, L.; Filonova, E.; Medvedev, D. and Maignan, A.
Materials 2021, 14(7), 1715; https://doi.org/10.3390/ma14071715
Full text available online: https://www.mdpi.com/1996-1944/14/7/1715

5. “Utilization of Red Mud as a Source for Metal Ions—A Review”
by Samal, S.
Materials 2021, 14(9), 2211; https://doi.org/10.3390/ma14092211
Full text available online: https://www.mdpi.com/1996-1944/14/9/2211

6. “Investigation of Lithium Ion Diffusion of Graphite Anode by the Galvanostatic Intermittent Titration Technique”
by Park, J. H.; Yoon, H.; Cho, Y. and Yoo, C.-Y.
Materials 2021, 14(16), 4683; https://doi.org/10.3390/ma14164683
Full text available online: https://www.mdpi.com/1996-1944/14/16/4683

7. “Enhanced Structural Stability and Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials by Ga Doping”
by Liu, Z.; Li, J.; Zhu, M.; Wang, L.; Kang, Y.; Dang, Z.; Yan, J. and He, X.
Materials 2021, 14(8), 1816; https://doi.org/10.3390/ma14081816
Full text available online: https://www.mdpi.com/1996-1944/14/8/1816

8. “Nanocomposites Prepared from Carbon Nanotubes and the Transition Metal Dichalcogenides WS₂ and MoS₂ via Surfactant-Assisted Dispersions as Electrocatalysts for Oxygen Reactions”
by Ferreira, P.; Abreu, B.; Freire, C.; Fernandes, D. M. and Marques, E. F.
Materials 2021, 14(4), 896; https://doi.org/10.3390/ma14040896
Full text available online: https://www.mdpi.com/1996-1944/14/4/896

9. “Recent Progress in Cathode Materials for Sodium-Metal Halide Batteries”
by Zhan, X.; Li, M. M.; Weller, J. M.; Sprenkle, V. L. and Li, G.
Materials 2021, 14(12), 3260; https://doi.org/10.3390/ma14123260
Full text available online: https://www.mdpi.com/1996-1944/14/12/3260

10. “Flexible Supercapacitors Based on Graphene/Boron Nitride Nanosheets Electrodes and PVA/PEI Gel Electrolytes”
by Wang, C.; Hu, K.; Liu, Y.; Zhang, M.-R.; Wang, Z. and Li, Z.
Materials 2021, 14(8), 1955; https://doi.org/10.3390/ma14081955
Full text available online: https://www.mdpi.com/1996-1944/14/8/1955