Publications by authors named "Yuhwan Hyeon"
The conventional pH sensor based on the graphene ion-sensitive field-effect transistor (Gr-ISFET), which operates with an electrostatic gating at the solution-graphene interface, cannot have a pH sensitivity above the Nernst limit (∼59 mV/pH). However, for accurate detection of the pH levels of an aqueous solution, an ultrasensitive pH sensor that can exceed the theoretical limit is required. In this study, a novel Gr-ISFET-based pH sensor is fabricated using proton-permeable defect-engineered graphene.
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- MoS-carbon composite catalysts enhance hydrogen evolution reaction (HER) activity by using carbon materials as supports, which boost the surface area and electron transport rate.
- The study investigates how the structural properties of carbon supports, specifically surface defect density and electrical resistance, affect the HER performance of MoS in composite catalysts.
- Results show that while intrinsic catalytic activity improves with the conductance of carbon supports, the apparent current density in HER depends on both the MoS edge site density and the conductance of the carbon supports.