Electrostatically self-assembled dual-functional MXene/CoNiMn-LDH composites for biocompatible electrochemical energy storage and non-enzymatic glucose sensor applications

• Published in: Applied materials today Vol. 39; p. 102263
• Main Authors: Kasirajan, Kasinathan, Rajkumar, Palanisamy, Kwon, Hong Gu, Yim, Jin-Heong, Kim, Jinho, Choi, Hong Kyoon
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-08-2024
• Subjects: Asymmetric supercapacitor; Chronoamperometry; CoNiMn-LDH; Glucose; MXene; Asymmetric supercapacitor; Glucose; CoNiMn-LDH; Chronoamperometry; MXene
• ISSN: 2352-9407; 2352-9415
• DOI: 10.1016/j.apmt.2024.102263

•Hierarchical MXene/NiMn-LDH NCs were synthesized via an electrostatically self-assembled approach.•MXene/NiMn-LDH is coated with Ni foam as a positive electrode.•The ASC devices proved high energy and power densities, as well as exceptional cycling retention.•The MXene/NiMn-LDH/GCE electrode has a good linear range and a low detection limit of 0.24 µM.•The composite is biocompatible, with 80% cell viability.•MXene/CoNiMn-LDH NCs are promising candidates for next-generation textile-based wearable devices.
Many researchers have been interested in integrating bifunctional electrode materials with supercapacitors and non-enzymatic glucose sensors, which has sparked considerable interest in recent years. Hierarchical MXene/NiCoMn-LDH NCs were successfully constructed using a hydrothermal approach via electrostatic coupling between negatively charged MXene nanosheets and positively charged CoNiMn-LDH network. Consequently, the addition of MXene may prevent the aggregation of the CoNiMn-LDH nanosheets, significantly enhancing the electrical conductivity and providing more active sites. The additives MXene and CoNiMn-LDH have significantly improved energy storage and glucose sensing. The MXene/CoNiMn-LDH electrode has a specific capacitance of 906 F g−1 at 1 A g−1 and outstanding capacity retention of 90.8% after 10,000 cycles. Additionally, the MXene/CoNiMn-LDH/AC ASC device provides a maximum energy and power density of 69.5 Wh kg−1 and 1500 W kg−1, respectively. In addition to this, the constructed MXene/CoNiMn/GCE electrode based non-enzymatic glucose sensor demonstrated a linear range (10 – 900 µM; R2 = 0.998) with a significant detection limit of 0.24 μM. Furthermore, the biocompatibility of the MXene/CoNiMn-LDH composites indicated approximately 80% of cell viability at 100 μM concentrations. Thus, this study demonstrates that MXene/CoNiMn-LDH is a promising electrode material for energy and electrochemical glucose sensing applications.
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