Excellent Supercapacitive Response of Microwave-synthesized Two-Dimensional Transitional Metal Oxide Using Metal Chloride Precursor*

 

In the past decade, many 2D materials beyond graphene, such as 2D Transition Metal Dichalcogenides (TMDs), Transition Metal Carbides as well as Nitrides, and group V elements like phosphorene, arsenene etc., have been investigated. However, the layered metal oxides 2D materials have gained intermittent attention for their unique electronic, photocatalytic, sensing, and magnetic properties. Their ultrathin structure gives rise to novel characteristics and potential applications compared to their bulk counterparts. Hematene, a 2D ultrathin layer of iron oxide (Fe₂O₃), was synthesized upon microwave irradiation. Their chemical identification is done with the help of Raman and X-ray photo spectroscopy. Hematene is an n-type semiconductor and negative photoconductivity has been observed, with green excitation showing the highest sensitivity. Electrochemical measurements performed at an open circuit voltage of 0.58V on the as-prepared sample, as an electrode active component, showed excellent supercapacitive characteristics with capacitive retention of ~80% even after 10000 cycles at a current density of 5mA/cm².

References:

1. 1. Chahal, Sumit, Susan M. Kauzlarich, and Prashant Kumar. "Microwave synthesis of hematene and other two-dimensional oxides." ACS Materials Letters 3.5 (2021): 631-640.
   
   2. Rahaman, Sabiar, et al. "Scalable novel lanthanide-ligand complex for robust flexible micro-supercapacitors." Journal of Power Sources 564 (2023): 232801.