Anti-Poisoning Electrode for Real-Time In-Situ Monitoring of Hydrogen Sulfide Release
Salama, Khaled N.
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Sensors Lab, Advanced Membranes & Porous Materials Center (AMPMC), Computer Electrical Mathematical Science and Engineering (CEMSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Embargo End Date2022-09-06
Permanent link to this recordhttp://hdl.handle.net/10754/665046
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AbstractElectrode poisoning and interferences from complex biological environments are major challenges in the development of in-situ H2S sensors. To circumvent these issues, herein a robust electrode based on reduced graphene oxide-molybdenum disulfide nanohybrid (RGO-MoS2) and polymerized o-phenylenediamine (POPD) is developed. The POPD/RGO-MoS2-modified electrode catalyzed H2S oxidation at a minimized overpotential (+ 0.15 V vs. Ag/AgCl). A new strategy based on inherent material properties was implemented to alleviate the electrode-poisoning problem. The nano-tailored interface blocks 2.5-fold surplus levels of interferences because of its exclusive size-exclusion property and electrostatic interactions. Moreover, this method with a response time of fewer than 5 s displayed a detection limit of 10 nM, which covers the endogenous H2S levels. Practicality tests in various biological media yielded valuable recoveries of 96.4–97.8%. The amounts of H2S released from the bacterial cells were quantified in real-time over a continuous time span of 5 h.
CitationJeromiyas, N., Mani, V., Chang, P.-C., Huang, C.-H., Salama, K. N., & Huang, S.-T. (2020). Anti-Poisoning Electrode for Real-Time In-Situ Monitoring of Hydrogen Sulfide Release. Sensors and Actuators B: Chemical, 128844. doi:10.1016/j.snb.2020.128844
SponsorsThis work was supported by the Ministry of Science and Technology (MOST; 107-2113-M-027-007 – and 108-2221-E-027-063–) Taiwan (ROC) and King Abdullah University of Science and Technology (KAUST), Saudi Arabia.