A5003911140- Ammonia Synthesis and Nitrogen Reduction
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Hydrogen Storage and Materials
- Caching and Content Delivery
- Advanced Sensor and Energy Harvesting Materials
- Catalytic Processes in Materials Science
- Conducting polymers and applications
- Fuel Cells and Related Materials
- Tactile and Sensory Interactions
- Muscle activation and electromyography studies
- Advanced battery technologies research
- Advanced Battery Technologies Research
- Nanomaterials for catalytic reactions
Kumoh National Institute of Technology
2024-2025
Korea Institute of Science and Technology
2017-2023
Yonsei University
2020-2023
Korea University of Science and Technology
2023
Korea University
2017
The electrochemical synthesis of NH3 by the nitrogen reduction reaction (NRR) at low temperature (<65 °C) and atmospheric pressure using nanosized γ-Fe2O3 electrocatalysts were demonstrated. activity selectivity catalyst was investigated both in a 0.1 M KOH electrolyte when incorporated into an anion-exchange membrane electrode assembly (MEA). In half-reaction experiment conducted electrolyte, presented faradaic efficiency 1.9% weight-normalized 12.5 nmol h–1 mg–1 0.0 VRHE. However, toward...
Electrochemical nitrogen reduction reaction (NRR) is a promising method for energy-efficient and low-emission NH3 production. Herein, we report electrochemical production using copper sulfide-based electrocatalyst. A solid-state synthesis employed to prepare the Cu9S5 catalyst artificial N2 fixation in neutral aqueous electrolyte. Despite an excellent NRR activity of 10.8 ± 0.4 μg/hcm2 at −0.5 VRHE, however, itself reductively degraded during NRR. To achieve continuous production,...
The electrochemical nitrogen reduction reaction (NRR) has been regarded as a promising alternative to the conventional Haber–Bosh process for NH3 synthesis. Inspired by Fe–Mo–S cofactor in enzyme nitrogenase, metal sulfide catalysts, mostly Fe- or Mo-based sulfides, have recently received great interest. Here, we propose Cu2–xS (0 ≤ x < 1) an efficient NRR electrocatalyst. Electrochemical tests at room temperature and atmospheric pressure reveal that Cu1.81S achieves high yield of 2.19 μmol...
Sound is a powerful communication tool that outperforms visual signals in emergencies. However, research on sound energy harvesting has been limited because of its relative weakness as an ambient source. The development sensitive and efficient technologies crucial for human safety applications. Triboelectric nanogenerators (TENGs) are energy‐harvesting devices generate electrical through mechanical movement. previous studies have used conventional vertical contact separation mode structures,...
We studied the electrochemical synthesis of NH3 on Fe–CuS/C catalysts in an alkaline aqueous solution under ambient conditions. The metal chalcogenide catalyst is active nitrogen reduction reaction (NRR) for approximately 45 min with production yield 16 μg h–1 cm–2 at −0.4 VRHE, while it decomposes to CuO. rapid degradation hinders precise investigation activity longer time measurements. Herein, rate enhanced increased overpotentials when effect mitigated measurement, which was difficult...
Stability of membranes in electrolysers is challenged by dimensional changes, when dry are assembled and wetted the electrolyser starts. Assembling wet challenging because water evaporates during handling. To minimize FAA3 pre-swollen aqueous ethylene glycol (EG, boiling point 197°C). Membranes partially dissolve 100 vol% EG, swell excessively 70 vol%. Swelling 50 shows smallest changes handling (shrink) re-immersion KOH solution (swelling, mimicking start electrolyser). These show about 30%...
As an alternative to the conventional Haber–Bosch process for NH3 synthesis that operates under harsh conditions, electrochemical has recently been pursued. Here, using a joint experiment–density functional calculation approach, we determine activity trend of four transition metals (TMs) (Fe, Ru, Rh, and Pd) N2 reduction NH3: Fe > Ru Pd where protonation step *N2 form *N2H (* indicates surface sites) is potential determining (PDS). The electrocatalysts determined by ability adsorbate (*N2)...
Developing efficient electrochemical processes for ammonia (NH3) production is a significant challenge that needs to be met realize carbon-neutral chemical industry. Recently, electrocatalytic nitrogen-reduction has been actively investigated under ambient conditions. However, the evaluation of electrodes NH3 using ex-situ detection methods only provide time- and space-averaged catalytic information. When investigating transient activity with spatiotemporal information, real-time near...
The rapid growth of Internet Things (IoT) in recent years has increased demand for various sensors to collect a wide range data. Among sensors, the force that can recognize physical phenomena 3D space notably increased. Recent research focused on developing energy harvesting methods address their maintenance problems. Triboelectric nanogenerator (TENG) based are promising solution converting external motion into electrical signals. However, conventional TENG-based use signal peak negatively...
Single-atom catalysts are heterogeneous with atomistically dispersed atoms acting as a catalytically active center, and have recently attracted much attention owing to the minimal use of noble metals. However, scalable inexpensive support that can stably anchor isolated remains challenge due high surface energy. Here, copper-halide polymer nanowires sub-nanometer pores proposed versatile for single-atom catalysts. The synthesis is straightforward completed in few minutes. Well-defined large...
Developing efficient electrochemical processes for ammonia (NH3) production is a significant challenge that needs to be met realize the carbon-neutral chemical industry. Recent studies actively investigated electrocatalytic nitrogen reduction under ambient conditions. However, evaluation of electrodes NH3 using ex-situ detection methods only provide time- and space-averaged catalytic information. To investigate transient activity with spatiotemporal information, real-time near electrode at...