Energy Materials International Webinar Series #6
Contents
Host
Prof. Sining Yun
School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi, China.
Speaker
Prof. Ho Won Jang
Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea.
Topic: Single Atom Catalysts for Highly Enhanced Photoelectrochemical Water Splitting
Ho Won Jang is a full professor in Department of Materials Science and Engineering at Seoul National University. He earned his Ph.D in Department of Materials Science and Engineering at Pohang University of Science and Technology in 2004. He worked as a research associate at University of Madison-Wisconsin from 2006 to 2009. Before he joined Seoul National University in 2012, he had worked at Korea Institute of Science and Technology as a senior research scientist. He is a member of Young Korean Academy of Science and Technology. His research interests include materials synthesis and device fabrication for solar fuel generation, chemical sensing, neuromorphic computing, and optoelectronics. He has published more than 520 papers in international refereed journals.
Abstract: Stabilizing atomically dispersed single atoms (SAs) on Si photoanodes for photoelectrochemical oxygen evolution reaction is still challenging due to the scarcity of anchoring sites. Here, we elaborately demonstrate the decoration of Ir SAs on Si photoanodes and assess the role of SAs on the separation and transfer of photogenerated charge carriers. NiO/Ni thin film, an active and highly stable catalyst, is capable of embedding the Ir SAs in its lattices by locally modifying the electronic structure. The isolated Ir SAs enable the effective photogenerated charge transport by suppressing the charge recombination and lower the thermodynamic energy barrier in the potential-determining step. The Ir SAs/NiO/Ni/ZrO2/n-Si photoanode exhibits a benchmarking photoelectrochemical performance with a high photocurrent density of 27.7 mA cm-2 at 1.23 V RHE and 130 h stability. This study proposes the rational design of SAs on Si photoelectrodes and reveals the potential of the Ir SAs to boost photogenerated charge carrier kinetics. We will show another material system that employs SAs on Si photoanodes for highly enhanced photoelectrochemical oxygen evolution reaction.
Topic: Single Atom Catalysts for Highly Enhanced Photoelectrochemical Water Splitting
Ho Won Jang is a full professor in Department of Materials Science and Engineering at Seoul National University. He earned his Ph.D in Department of Materials Science and Engineering at Pohang University of Science and Technology in 2004. He worked as a research associate at University of Madison-Wisconsin from 2006 to 2009. Before he joined Seoul National University in 2012, he had worked at Korea Institute of Science and Technology as a senior research scientist. He is a member of Young Korean Academy of Science and Technology. His research interests include materials synthesis and device fabrication for solar fuel generation, chemical sensing, neuromorphic computing, and optoelectronics. He has published more than 520 papers in international refereed journals.
Abstract: Stabilizing atomically dispersed single atoms (SAs) on Si photoanodes for photoelectrochemical oxygen evolution reaction is still challenging due to the scarcity of anchoring sites. Here, we elaborately demonstrate the decoration of Ir SAs on Si photoanodes and assess the role of SAs on the separation and transfer of photogenerated charge carriers. NiO/Ni thin film, an active and highly stable catalyst, is capable of embedding the Ir SAs in its lattices by locally modifying the electronic structure. The isolated Ir SAs enable the effective photogenerated charge transport by suppressing the charge recombination and lower the thermodynamic energy barrier in the potential-determining step. The Ir SAs/NiO/Ni/ZrO2/n-Si photoanode exhibits a benchmarking photoelectrochemical performance with a high photocurrent density of 27.7 mA cm-2 at 1.23 V RHE and 130 h stability. This study proposes the rational design of SAs on Si photoelectrodes and reveals the potential of the Ir SAs to boost photogenerated charge carrier kinetics. We will show another material system that employs SAs on Si photoanodes for highly enhanced photoelectrochemical oxygen evolution reaction.
Presentation
Prof. Ho Won Jang
Topic: Single Atom Catalysts for Highly Enhanced Photoelectrochemical Water Splitting
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Topic: Free Discussion
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