1 A review on zinc oxide composites for energy storage applications: solar cells, batteries, and supercapacitors https://jourcc.com/index.php/jourcc/article/view/jcc336 10.52547/jcc.3.3.6 20.1001.1.26765837.2021.3.8.6.3 1 Zinc oxide (ZnO) is used for various purposes because of its special physico-chemical properties, including large band gap, high binding energy of exciton, nontoxicity, high chemical and thermal stability, large piezoelectric constants, and wurtzite crystal structure with various and widespread applications in electronics, optoelectronics, biochemical sensing, biomedical, and energy-saving systems. This review mainly aimed to present the recent improvement in ZnO-based composite materials with utilization in energy storage systems with a specific focus on lithium-ion batteries, dye-sensitized solar cells, and supercapacitors. The first part of this paper looks at the structure and properties of ZnO and then describes some of the most common synthesizing methods of ZnO composites, including electrochemical, chemical, solvo/hydrothermal, and physical deposition methods. Finally, the recent advancement of ZnO-based composite materials applied in energy storage systems was discussed. 182 193 Vu Khac Hoang Bui Gachon University Korea info@jourcc.com M. Krishna Kumar Kalasalingam Academy of Research and Education India info@jourcc.com Mahdi Alinaghibeigi Hamedan University of Technology Iran info@jourcc.com Sreejesh Moolayadukkam Centre for Nano and Soft Matter Sciences India info@jourcc.com Sara Eskandarinejad Yazd University Iran s.eskandari.nezhad@gmail.com Shirin Mahmoudi Materials and Energy Research Center Iran info@jourcc.com Sadegh Mirzamohammadi Technical and Vocational University (TVU) Iran info@jourcc.com Mojdeh Rezaei-khamseh HESAM University France info@jourcc.com ZnO Battery Dye-sensitized solar cells Supercapacitor Energy storage applications Article6.pdf [1] Y. Wang, X. Xiao, H. Xue, H. Pang, Zinc Oxide Based Composite Materials for Advanced Supercapaci-tors, ChemistrySelect 3(2) (2018) 550-565. ## [2] A.S. Farooqi, M. Yusuf, N.A.M. Zabidi, R. Saidur, K. Sa-naullah, A.S. Farooqi, A. Khan, B.J.I.J.o.H.E. 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