Browsing by Author "Le Gia Trung"

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Cu-doped SnS/Sn2S3 electrocatalyst for high-performance methanol-mediated overall water splitting
(Elsevier B.V., 2025) Rajneesh Kumar Mishra; Gyu-jin Choi; Le Gia Trung; Jongwon Ryu; Hwajun Joon Jeon; S. Dasaratha Kumar; Jay Singh; Jin-seog Gwag
Herein, we discussed the bifunctional nature of Cu-doped SnS/Sn2S3 electrocatalyst for methanol-mediated overall water-splitting application. The XRD suggests the crystal structure of Cu-SnS/Sn2S3 and its successful synthesis. TEM images show the lattice spacing of the Sn2S3 and SnS of SnS/Sn2S3 and Cu-SnS/Sn2S3 heterostructures. Further, the HRTEM and FFT patterns clarify the lattice planes and spacings of SnS and Sn2S3 of SnS/Sn2S3 and Cu-SnS/Sn2S3 heterostructures. The Cu-doped SnS/Sn2S3 catalyst discloses a lower overpotential of 95.1 mV at −10 mA cm−2 current density for methanol-mediated hydrogen evolution reaction (M-HER) and 194 mV at 10 mA cm−2 for methanol oxidation reaction (MOR), respectively, which is significantly lower than undoped SnS/Sn2S3 catalyst. Additionally, Cu-doped SnS/Sn2S3 catalyst captures notable stability for 20 h for M-HER and MOR at −10 mA cm−2 at 10 mA cm−2, respectively. In addition, Cu-SnS/Sn2S3∥Cu-SnS/Sn2S3 shows a low potential of 1.531 V as matched with 1.645 V of SnS/Sn2S3∥SnS/Sn2S3 during methanol-mediated overall water splitting (M-OWS). Besides, SnS/Sn2S3∥SnS/Sn2S3 cell reveals outstanding stability for 30 h at 10 mA cm−2 and staircase resilience for 18 h at diverse current densities. Curiously, Cu doping is pivotal in enhancing the M-HER, MOR, and M-OWS catalytic activities of Cu-SnS/Sn2S3 catalyst. © 2025 Elsevier B.V.
Recent advances in ZnO nanostructure as a gas-sensing element for an acetone sensor: a short review
(John Wiley and Sons Ltd, 2023) Rajneesh Kumar Mishra; Vipin Kumar; Le Gia Trung; Gyu Jin Choi; Jeong Won Ryu; Rajesh Bhardwaj; Pushpendra Kumar; Jay Singh; Seung Hee Lee; Jin Seog Gwag
Air pollution is a severe concern globally as it disturbs the health conditions of living beings and the environment because of the discharge of acetone molecules. Metal oxide semiconductor (MOS) nanomaterials are crucial for developing efficient sensors because of their outstanding chemical and physical properties, empowering the inclusive developments in gas sensor productivity. This review presents the ZnO nanostructure state of the art and notable growth, and their structural, morphological, electronic, optical, and acetone-sensing properties. The key parameters, such as response, gas detection limit, sensitivity, reproducibility, response and recovery time, selectivity, and stability of the acetone sensor, have been discussed. Furthermore, gas-sensing mechanism models based on MOS for acetone sensing are reported and discussed. Finally, future possibilities and challenges for MOS (ZnO)-based gas sensors for acetone detection have also been explored. © 2022 John Wiley & Sons Ltd.