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Material science lesson from the biological photosystem
김영혜,Lee Jun Ho,Ha Heonjin,Im Sang Won,Nam Ki Tae 나노기술연구협의회 2016 Nano Convergence Vol.3 No.19
Inspired by photosynthesis, artificial systems for a sustainable energy supply are being designed. Each sequential energy conversion process from light to biomass in natural photosynthesis is a valuable model for an energy collection, transport and conversion system. Notwithstanding the numerous lessons of nature that provide inspiration for new developments, the features of natural photosynthesis need to be reengineered to meet man’s demands. This review describes recent strategies toward adapting key lessons from natural photosynthesis to artificial systems. We focus on the underlying material science in photosynthesis that combines photosystems as pivotal functional materials and a range of materials into an integrated system. Finally, a perspective on the future development of photosynthesis mimetic energy systems is proposed.
Balamurugan Mani,Saravanan Natarajan,Ha Heonjin,이윤호,Nam Ki Tae 나노기술연구협의회 2018 Nano Convergence Vol.5 No.18
Manganese plays multiple role in many biological redox reactions in which it exists in different oxidation states from Mn(II) to Mn(IV). Among them the high-valent manganese-oxo intermediate plays important role in the activity of certain enzymes and lessons from the natural system provide inspiration for new developments of artificial systems for a sustainable energy supply and various organic conversions. This review describes recent advances and key lessons learned from the nature on high-valent Mn-oxo intermediates. Also we focus on the elemental science developed from the natural system, how the novel strategies are realised in nano particles and molecular sites at heterogeneous and homogeneous reaction conditions respectively. Finally, perspectives on the utilisation of the high-valent manganese-oxo species towards other organic reactions are proposed.
Water Oxidation Mechanism for 3d Transition Metal Oxide Catalysts under Neutral Condition
Seo, Hongmin,Cho, Kang Hee,Ha, Heonjin,Park, Sunghak,Hong, Jung Sug,Jin, Kyoungsuk,Nam, Ki Tae The Korean Ceramic Society 2017 한국세라믹학회지 Vol.54 No.1
Electrochemical water splitting to produce hydrogen energy is regarded as a promising energy conversion process for its environmentally friendly nature. To improve cell efficiency, the development of efficient water oxidation catalysts is essentially demanded. For several decades, 3d transition metal oxides have been intensively investigated for their high activity, good durability and low-cost. This review covers i) recent progress on 3d transition metal oxide electrocatalysts and ii) the reaction mechanism of oxygen evolving catalysis, specifically focused on the proposed pathways for the O-O bond formation step.
Hierarchical carbon-silicon nanowire heterostructures for the hydrogen evolution reaction
Moon, Joonhee,Sim, Uk,Kim, Dong Jin,Ahn, Hyo-Yong,An, Junghyun,Ha, Heonjin,Choi, Kyoung Soon,Jeon, Cheolho,Lee, Jouhahn,Nam, Ki Tae,Hong, Byung Hee The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.29
<P>Silicon nanowires (SiNWs) opened up exciting possibilities in a variety of research fields due to their unique anisotropic morphologies, facile tuning capabilities, and accessible fabrication methods. The SiNW-based photoelectrochemical (PEC) conversion has recently been known to provide an efficiency superior to that of various photo-responsive semiconductor heterostructures. However, a challenge still remains in designing optimum structures to minimize photo-oxidation and photo-corrosion of the Si surface in a liquid electrolyte. Here, we report a simple method to synthesize hierarchically branched carbon nanowires (CNWs) on SiNWs utilizing copper vapor as the catalyst in a chemical vapor deposition (CVD) process, which exhibits outstanding photocatalytic activities for hydrogen generation along with excellent chemical stability against oxidation and corrosion. Thus, we believe that the CNW-SiNW photoelectrodes would provide a new route to developing high-performing cost-effective catalysts essential for advanced energy conversion and storage technologies.</P>