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Metal selenides of were synthesized for various weight percentage of Mn (0.05, 0.1, and 0.15 wt %). MnSe 2 -CoSe 2 emerged as the novel-energy storing material for the supercapacitor application and guaranteed the improved electrochemical performance in asymmetric configuration. As prepared metal selenide composite was explored for standard characterization studies. XRD reveals the highly crystalline in nature of the as prepared samples. Se bonding with Mn-Co is confirmed from the sharp peak obtained at 470 cm−1. The chemical elemental composition was evaluated by the XPS, hence the characterization outcome confirm the successful growth of the material. The specific capacitance of Mn3 (0.15 wt %) is 373 Fg-1 in 1 M KOH; Mn1 (0.05 wt %-184 Fg-1) and Mn2 (0.1 wt %-295 Fg-1). The electrode shows excellent capacity retention of 95.86% at 5 Ag-1 even after 5000 cycles. Furthermore, asymmetric configuration of Mn3 (0.15 wt %)//AC device delivered significant value of power density even at high energy density. Thus, the as-prepared asymmetric device easily illumines the green light emitting diode which indicates the Mn3 (0.15 wt %) is an acceptable product. [ABSTRACT FROM AUTHOR]

• Improved specific capacitance of 365 Fg−1 at 1 Ag−1 was achieved. • Outstanding 99% cyclabilty even after 5000 cycles was achieved. • Product explored enhanced stability. Electrode material potential evolution is a proficient and vast challenge to deliver improved electrochemical performance in supercapacitors. This work reports a combination of ternary selenide (CoNiSe 2) electrode performance. Different surfactant effect seems to boost up prepared electrode performance. Hexagonal structured CoNiSe 2 revealed sharp XRD peak at 33.4° (1 0 1) plane and explored crystalline phase purity. FTIR uphold functional O–H group and a metal complex. The sharp band at 476 cm−1 ascribed to Se bonding with the obtained product. PEG-1000 influence on ternary selenide elucidates charge transfer kinetics between energy levels among CTAB and HMTA. The electrode shows outstanding energy storage capacities with 99% of cyclability long-lasting even after 5000 cycles. The ternary selenide using PEG 1000 assisted surfactant experiences enhanced stability with an improved capacitance of 365 Fg−1 at 1 Ag−1. Among surfactants, PEG 1000 assisted CoNiSe 2 showed excellent performance and proves the product is well suitable for the storage applications. [ABSTRACT FROM AUTHOR]

• Unique layered structural property enhanced electrochemical performance. • Increased specific capacitance of 1100 Fg−1 at 0.5 A/g at 0.5 V. • Better rate capability and stability achieved within studied range. • Product explored enhanced stability and retains 98.1% after 2000 cycles. Material storage property enrichment with good electrochemical performance is a foremost challenge. Cobalt hydroxide and reduced graphene oxide (rGO) composite synthesized via chemical precipitation method showed improved specific capacitance and cycle stability. The unique rGO layered structure in composite enhanced overall electrochemical performance. Raman spectra revealed disordered rGO structure and A 1g mode of Co(OH) 2 in composite. rGO/Co(OH) 2 electrode showed increased specific capacitance of 1100 Fg−1 at 0.5 Ag−1 with better rate capability and good stability (98.1%) after 2000 cycles. These results proved that rGO/Co(OH) 2 is a perfect electrode for electrochemical energy storage applications. [ABSTRACT FROM AUTHOR]