Synthesis of high-performance supercapacitor electrode materials by hydrothermal route based on ZnSe/MnSe composite.

The energy crises have emerged in the contemporary period due to the rapid expansion of industry. The expansion of high-capacity storage systems that can operate independently and use renewable energy is essential. The pseudocapacitors are known for their excellent anode properties, which contribute to high specific capacitance (C s). Transition metal selenide (TMS) has arisen as a highly promising choice for anode materials in supercapacitor (SC s) devices, owing to its noteworthy conductivity and storage capacity. In the current investigation, the simple hydrothermal approach was utilized to achieve the successful synthesis of the binary ZnSe@MnSe (ZS@MS) composite for electrode material. However, crystallinity of ZS@MS composite indicates its potential for utilization as an electrode in supercapacitor (SC s) applications. Moreover, ZS@MS electrode revealed remarkable specific capacitance (C s) of 1439.98 F g−1 in electrochemical performance. In addition, ZS@MS electrode exhibits a high energy density (E d) of 56.17 Wh kg−1 and power density (P d) 265 W kg−1 at 1 A g−1. Moreover, ZS@MS electrode demonstrates stable behavior and exceptional cyclic stability over 5000th cycles. Fabricated ZS@MS electrode material possesses more electrochemical properties than pure materials, making it highly promising for supercapacitors (SC s) and other energy storage-related applications. • Hydrothermal technique was used to synthesized ZnSe, MnSe and ZnSe/MnSe composite which shows specific capacitance (C s) of 536 F g−1, 733 F g−1 and 1439.89 F g−1, respectively at 1 A g−1. • MnSe/ZnSe exhibit energy density (56.17 Wh kg−1) and power density (265 W kg−1) at 1 A g−1. • MnSe/ZnSe composite exhibit high stability after 5000th cycles indicate the stable behavior of nanocomposite materials. • ZnSe/MnSe exhibit low Rct value of 0.35 Ω as compared to ZnSe of 0.51 Ω and MnSe of 0.46 Ω. [ABSTRACT FROM AUTHOR]