Journals

Laser Photochemistry Laboratory

#242. Accelerating the hydrogen evolution kinetics with a pulsed laser–synthesized platinum nanocluster–decorated nitrogen-doped carbon electrocatalyst for natural seawater electrolysis
Author
Velusamy Maheskumar† , Ahreum Min† , Raja Arumugam Senthil, Cheol Joo Moon , Myong Yong Choi*
Journal
submitted(2023)
Acknowledgements
2019R1A6C1010042, 2021R1A6C103A427, 2022R1A2C2010686, 2022R1A4A3033528, 2021R1C1C2010726


Efficient and durable electrocatalysts for the hydrogen evolution reaction (HER) in natural seawater environments are essential for sustainable hydrogen production. We synthesized zeolitic imidazolate framework-8 (ZIF-8) through pulsed laser ablation in liquid, followed by pyrolysis, producing N-doped porous carbon (NC). NC matrix served as a self-template, enabling Pt nanocluster decoration (NC-Pt) via pulsed laser irradiation in liquid. NC-Pt exhibits a large surface area, porous structure, high conductivity, N-rich carbon, abundant active sites, low Pt content, and a strong NC-Pt interaction. These properties enhance efficient mass transport during the HER. Remarkably, the optimized NC-Pt-4 catalyst achieved low HER overpotentials of 52, 57, and 53 mV to attain 10 mA cm−2 in alkaline, natural seawater, and simulated seawater, surpassing commercial Pt/C catalysts. In a two-electrode system with NC-Pt-4(−)ǀǀIrO2(+) as cathode and anode, it demonstrated excellent direct seawater electrolysis performance, with a low cell voltage of 1.63 mV to attain 10 mA cm−2 and remarkable stability. This study presents a rapid and efficient method for fabricating cost-effective and highly effective electrocatalysts for hydrogen production in alkaline and natural seawater environments.