Unveiling the potential of nanosheet-based NiTe@MnTe hollow nanospheres in hybrid supercapacitor technology

• Published in: Sustainable energy & fuels 2023-09, Vol.7 (19), p.4922-4934
• Main Authors: Farashah, Dorsa Dehghanpour, Beigloo, Fatemeh, Zardkhoshoui, Akbar Mohammadi, Hosseiny Davarani, Saied Saeed
• Format: Article
• ISSN: 2398-4902
• DOI: 10.1039/d3se00919j

In the pursuit of developing superior hybrid supercapacitors, it's vital to secure positive electrode materials that maintain morphological integrity. In this regard, we have successfully synthesized hierarchical NiTe 2 @MnTe hollow spheres, adorned with nanosheets, also referred to as NMT-HS. Our method uses a nickel metal-organic framework (NiMOF) for the synthesis of the NMT-HS and these structures are then employed as positive electrode materials for hybrid supercapacitors. The inclusion of tellurium in the formation of the NMT-HS sample noticeably elevates its conductivity. The unique hollow structure of NiTe 2 @MnTe, combined with nanosheets, circumvents the typical aggregation and pulverization issues found in nanomaterials while ensuring sustained structural durability through cycling processes. Consequently, the NMT-HS electrode unveils highly desirable electrochemical attributes, including a capacity of 1325.50 C g −1 at 1 A g −1 , and a reliable lifespan surpassing 7000 cycles, with only a minor capacity loss of 8.15% at 7.5 A g −1 . We have crafted a hybrid device, dubbed (+)NMT-HS//(−)activated carbon (AC), which employs the NMT-HS positive electrode in tandem with the AC negative electrode. This device demonstrated a remarkable energy density of 62.3 W h kg −1 , a power density of 890 W kg −1 , and displayed substantial longevity (85.75% after 7000 cycles). This evidence underscores the significant potential and wide-ranging application of our uniquely designed electrode material in energy storage systems. Nanosheets constructed NiTe 2 @MnTe hollow nanospheres are synthesized for hybrid supercapacitor.