Research Area
Electrochemical N2 reduction reaction for green ammonia synthesis
전기화학적 N2 환원 반응을 통한 친환경 암모니아 합성
The transition towards carbon neutrality has escalated the pursuit of sustainable and clean hydrogen sources, casting a spotlight on innovative methods for ammonia production. Electrochemical ammonia synthesis via the electrochemical nitrogen reduction reaction (eNRR) presents a promising alternative to the traditional Haber-Bosch process, operating at significantly lower temperatures and pressures, and is well-suited for integration with renewable electricity sources. However, the physical and chemical stability of nitrogen's triple bond (N≡N) and its low solubility in solvents, particularly in water, present substantial challenges in electrochemical systems. Actually, eNRR is also dominated by hydrogen evolution reaction, adding complexity to ammonia synthesis. Currently, various electrocatalysts and approaches are being developed to improve the ammonia synthesis yield, selectivity (faradaic efficiency) and durability of the NRR, yet significant hurdles remain, particularly in the initial electrochemical catalytic electrode reaction surface where material transfer is challenging.
Our lab is dedicated to exploring sustainable methods of synthesizing green ammonia using electrochemical surface reactions with air (N2) and water. We aim to address the inherent challenges through focused research and collaborative efforts, investigating the role of catalysts, reaction conditions, and system design integration to advance this technology for industrial use. Our goal is to pave the way for scalable and environmentally friendly ammonia production, providing insights into ongoing research and future directions in this crucial field.
Electrochemical Ammonia Electrolysis to Hydrogen Production (eAEH)
전기화학적 암모니아 전해를 통한 수소 생산
Our proposed technology, Electrochemical Ammonia Electrolysis to Hydrogen Production (eAEH), represents a significant advancement in green energy conversion. This process is ideally coupled with renewable energy sources, operating at temperatures below 100°C and at atmospheric pressure in a single reactor without the need for additional separation or purification units. It simplifies production by eliminating complex processes, enabling the generation of high-purity hydrogen (~99.9%)—a cleaner and more energy-efficient solution compared to thermal catalytic decomposition methods, with no carbon emissions.
Thermodynamic Potential: Ammonia Oxidation Reaction
The ammonia oxidation reaction benefits from a low theoretical standard reversible voltage (E0rev = 0.06 V) and a thermoneutral voltage (Eothe = 0.08 V), making it highly efficient. In comparison to traditional water electrolysis, which requires over 3.24 kWh/m3, eAEH demands less than 0.175 kWh/m3 to produce hydrogen. This significant reduction in energy requirement showcases the thermodynamic advantages of eAEH over conventional hydrogen production methods.
Common Challenges in eAEH Research
A major hurdle in eAEH is the typically low reactivity of ammonia oxidation at the anode, which necessitates high overpotentials relative to the theoretical potential, demanding effective suppression of the Oxygen Evolution Reaction (OER). Additionally, the process often faces issues with catalyst poisoning by intermediates such as NHX, NxHy, NOx, and efficiency losses due to N-N recombination. These challenges call for thorough research into complete oxidation mechanisms and multi-electron/multi-pathway processes to enhance the efficiency and scalability of this promising technology.
High-pressure PEM water electrolysis cell to stack
고압 PEM 수전해 셀에서 스택 개발
Our laboratory is set to deepen its exploration in the field of water electrolysis, aiming to enhance the efficiency and sustainability of hydrogen production.
Development of Advanced Electrolysis Technologies
We are dedicated to advancing the design and functionality of PEM water electrolysis systems. Our future projects will involve optimizing these systems to operate at higher pressures, thereby increasing hydrogen output. By exploring innovative materials and cutting-edge technologies, we aim to reduce costs and improve the longevity and robustness of our electrolysis cells.
Scalability of Electrolysis Systems
A key objective is to transition from laboratory-scale models to larger, industrial-scale systems. This scale-up involves not only the physical expansion of the electrolysis stacks but also the integration of these systems with existing energy infrastructures. We aim to address challenges such as scaling production, enhancing operational stability, and maintaining efficiency at larger scales.
Integration with Renewable Energy Sources
To maximize the potential of water electrolysis, integration with renewable energy sources is crucial. We plan to develop systems that are directly linked to solar and wind energy outputs, optimizing the use of fluctuating energy sources to produce hydrogen in a more sustainable and cost-effective manner.
Catalyst and MEA Innovation for Improved Electrolysis
Our research will also focus on the development of novel electrocatalysts, electrodes, and Membrane Electrode Assemblies (MEAs) that can perform efficiently at the high pressures and temperatures required for advanced electrolysis. These new catalysts will aim to reduce the reliance on expensive noble metals and enhance the overall electrochemical performance.