Laser Photochemistry Laboratory

#241. Real-time monitoring cocktail effect of high-entropy alloys on carbon nanotube for hydrazine electrolysis via in situ Raman spectroscopy
Chae Eun Park†, Gyoung Hwa Jeong†, Velusamy Maheskumar, Sieon Jung, Jayaraman Theerthagiri, Myong Yong Choi*

Herein, we successfully design carbon nanotubes (CNT) embedded with high-entropy 

alloy (HEA) nanoparticles via pulsed laser irradiation coupled with hydrazine oxidation 

(HzOR)-enhanced water electrolysis. The electrochemical results revealed that the 

HEA/CNT-10 exhibited remarkable hydrogen and oxygen evolution reactions (HER 

and OER) performance with small overpotentials of 30.7 and 330 mV at 10 mA cm−2, 

correspondingly, with low Tafel slope and exceptional stability in an alkaline medium. 

By replacing OER with HzOR, HEA/CNT-10 required lower potential of 0.1 V to desire 

10 mA cm−2 compared with OER (1.56 V vs. RHE). The hydrazine splitting 

electrolyzer required a small cell voltage of 0.242 V to attain 10 mA cm−2 with 

outstanding stability. An optimal HEA/CNT-10 with cocktail effects strongly influences 

the efficiency of parallel HER||HzOR, highlighting the energy-saving sustainable 

hydrogen production. The real-time monitoring of H3O+ during HER via in situ 

electrochemical Raman spectroscopy revealed an acidic environment.