Ja Hun Kwak

Abstract To commercialize the technology of photoelectrochemical hydrogen production, it is essential to surpass the US. Department of Energy target of 0.36 mmol h−1 cm−2 for 1-sun hydrogen production rate. In this study, we utilize crystalline silicon, which can exhibit the highest photocurrent density (43.37 mA cm−2), as the photoelectrode material. However, achieving bias-free water splitting (>1.6 V) remains challenging due to the intrinsic low photovoltage of crystalline silicon (0.6 V).

Clarification of the mechanism of NO reduction with ammonia (SCR) on zeolite catalysts Konstantin Khivantsev, Ja Hun Kwak, Nicholas R Jaegers, Iskra Z Koleva, Georgi N. Vayssilov, Miroslaw A Derewinski, Yong Wang, Hristiyan A Aleksandrov and Janos Szanyi Abstract Cu/Zeolites efficiently catalyze selective reduction of environmentally harmful nitric oxide with ammonia. Despite over a decade of research, the exact NO reduction steps remain unknown.

Metal organic polyhedra (MOPs) have potential as supramolecular building blocks, but utilizing MOPs for postsynthetic polymerization has not been explored. Although MOPs with flexible organic moieties were recently reported to target enhanced processability, permanent porosity has not been demonstrated. Here, a novel synthetic strategy involving cross-linking of MOPs via covalent bond is demonstrated by exploiting condensation between the MOP and flexible organic linkers.