Publications by authors named "Hyeon-Ah Ju"
Electrocatalytic reactions are known to take place at the catalyst/electrolyte interface. Whereas recent studies of size-dependent activity in nanoparticles and thickness-dependent activity of thin films imply that the sub-surface layers of a catalyst can contribute to the catalytic activity as well, most of these studies consider actual modification of the surfaces. In this study, the role of catalytically active sub-surface layers was investigated by employing atomic-scale thickness control of the La Sr MnO (LSMO) films and heterostructures, without altering the catalyst/electrolyte interface.
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- Introducing point defects can enhance thermoelectric properties, but high temperatures often lead to the formation of vacancies, which negatively affect performance.
- A study using PbTe showed that doping with Ag can suppress these vacancies, resulting in a high thermoelectric figure of merit (zT ≈ 2.1 at 723 K).
- The combination of defect and carrier engineering improves performance by maintaining a high power factor and reducing thermal conductivity.