Lotus seedpods biochar decorated molybdenum disulfide for portable, flexible, outdoor and inexpensive sensing of hyperin

• Published in: Chemosphere (Oxford) 2022-08, Vol.301, p.134595-134595, Article 134595
• Main Authors: Rao, Liangmei, Zhu, Yifu, Duan, Zhongshu, Xue, Ting, Duan, Xuemin, Wen, Yangping, Kumar, Annamalai Senthil, Zhang, Weiming, Xu, Jingkun, Hojjati-Najafabadi, Akbar
• Format: Article
• Language: English
• Subjects: Biochar; Electrochemical sensor; Hyperin; Portable potentiostat; Smartphone
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.134595

Biomass waste, a good candidate for advanced carbon materials for sustainable electrodes, is receiving more and more attention for high value-added materials because of its promising contribution to economic growth and sustainable development. We proposed a green co-hydrothermal approach to prepare lotus seedpods biochar (BC) decorated molybdenum disulfide (MoS2) from waste lotus seedpods and precursors of MoS2, and a portable, flexible, outdoor and inexpensive sensing platform for hyperin on the integrated flexible three-electrode using U-disk potentiostat with smartphone was successfully developed. Structure and properties of MoS2-BC were characterized, it was proved that BC improves microstructure and morphology, electronic conductivity, electrode stability and electrocatalytic properties of MoS2. Attributing to these impressive features, the detection signal of hyperin was significantly amplified by the MoS2-BC modified glass carbon electrode (GCE) in detection range of 0.01–21 μΜ with detection limit (LOD) of 5 nM. It was worth mentioning that the MoS2-BC modified screen-printed electrode (SPE) performs hyperin detection in range of 100 nM - 3 μM with LOD 50 nM (S/N = 3). The practicability of the proposed method confirmed that the portable, on-site, low-cost, and outdoor detection of hyperin was feasible and practical in comparison with traditional both electrochemical sensing and HPLC methods. A portable U-disk potentiostat with smartphone for outdoor sensing of hyperin using lotus seedpods biochar decorated molybdenum disulfide on screen-printed electrode. [Display omitted] •Lotus seedpods biochar decorated molybdenum disulfide was prepared by co-hydrothermal method.•A portable U-disk potentiostat with smartphone for outdoor sensing of hyperin was developed.•The BC improved microstructure, conductivity, stability, and electrocatalytic capacity of MoS2.•The proposed method was feasible for portable, on-site, inexpensive, and outdoor detection.