123rd General Meeting of the KCS

Type Symposium
Area Beyond Batteries: Understanding New Types of Energy Storage Technology
Room No. Room 303
Time FRI 09:00-09:20
Code ELEC2-1
Subject Development of Non-Precious Metal Electrocatalysts Based on Mo-Compounds for Electrochemical Hydrogen Production
Authors Duck Hyun Youn
Department of Chemical Engineering, Kangwon National University, Korea
Abstract Development of efficient electrocatalysts for hydrogen evolution reaction (HER) with earth-abundant, non-precious materials is crucial for practical large-scale hydrogen production from electrochemical water splitting powered by renewable energy sources. Molybdenum compounds (Mo-compounds) are attracting great attention recently as a promising replacement for Platinum. Here we synthesized molybdenum carbide, nitride, and sulfide nanocrystals on CNT-graphene hybrid support via modified urea-glass route and their electrochemical activities for hydrogen evolution reaction were systematically investigated. By changing the amount of urea or replacing urea with thiourea, it was possible to control the final phases of the products from nitride, carbide to sulfide. Among the prepared catalysts, Mo2C/CNT-graphene (Mo2C/CNT-GR) showed the highest activity for hydrogen evolution reaction (HER) with small overpotential of 62 mV and Tafel slope of 58 mV/dec as well as an excellent stability in acid media. The performance represents one of the best among recently reported Mo-based electrocatalysts. Vastly improved electron transfer characteristics by incorporating CNT-graphene hybrid and low hydrogen binding energy compared to the others are mainly responsible for the excellent activity.
E-mail youndh@kangwon.ac.kr