Exploring the catalytic insights of nanoengineered binder-free cobalt sulfide in industrial-condition alkaline water electrolyzers for sustainable green hydrogen production
- Journal
- International Journal of Hydrogen Energy
- Status
- Volume 156
- Page
- 150357
- Year
- 2025
- Link
- https://doi.org/10.1016/j.ijhydene.2025.150357 214회 연결
Abstract
The development of ultra-stable bifunctional electrocatalysts for high-current operation is vital for advancing alkaline water electrolyzers toward sustainable green hydrogen production. In this viewpoint, binder-free cobalt sulfide (BF–CoS) anchored on Ni-foam via a two-step hydrothermal assisted sulfurization process is used for alkaine water electrolyzer. BF–CoS exhibited low overpotentials (η100 = 336 mV for OER, η-50 = −237 mV for HER) and retained its chemical/structural integrity even after continuous operation of 50 h. A lab-scale beaker type electrolyzer using BF–CoS catalyst showed a low cell voltage of 1.765 V at 50 mA cm−2 and maintained 1.80 V at 500 mA cm−2 under industrial conditions (80 °C). A solar-powered lab-scale electrolyzer was demonstrated to prove its potential system for green hydrogen production. These findings highlight BF–CoS as a promising binder-free electrocatalyst for next-generation, scalable, and sustainable hydrogen technologies.