|
Type |
Oral Presentation |
Area |
Oral Presentation for 2018 DOW Chemical Korea Award |
Room No. |
Room 202A |
Time |
THU 11:43-: |
Code |
KCS.O-12 |
Subject |
An efficient and pH-universal ruthenium-based catalyst for the hydrogen
evolution reaction |
Authors |
Javeed Mahmood, Feng Li, Sun-Min Jung, Mahmut Sait Okyay1, Ishfaq Ahmad, Seok-Jin Kim, Noejung Park1,*, Hu Young Jeong2,*, Jong-Beom Baek* School of Energy and Chemical Engineering, Centre for Dimension-Controllable Organic Frameworks, Korea 1School of Natural Science, Ulsan National Institute of Science and Technology, Korea 2UNIST Central Research Facilities, Ulsan National Institute of Science and Technology, Korea |
Abstract |
The hydrogen evolution reaction (HER) is a crucial step in electrochemical water splitting
and demands an efficient, durable and cheap catalyst if it is to succeed in real applications.
For an energy-efficient HER, a catalyst must be able to trigger proton reduction with
minimal overpotential and have fast kinetics. The most efficient catalysts in acidic media
are platinum-based, as the strength of the Pt–H bond is associated with the fastest reaction
rate for the HER. The use of platinum, however, raises issues linked to cost and stability in
non-acidic media. Recently, non-precious-metal-based catalysts have been reported, but
these are susceptible to acid corrosion and are typically much inferior to Pt-based
catalysts, exhibiting higher overpotentials and lower stability. As a cheaper alternative to
platinum, ruthenium possesses a similar bond strength with hydrogen (∼65 kcal mol–1), but
has never been studied as a viable alternative for a HER catalyst. Here, we report a
Ru-based catalyst for the HER that can operate both in acidic and alkaline media. Our
catalyst is made of Ru nanoparticles dispersed within a nitrogenated holey two-dimensional
carbon structure (Ru@C2N). The Ru@C2N electrocatalyst exhibits high turnover frequencies
at 25 mV (0.67 H2 s−1 in 0.5 M H2SO4 solution; 0.75 H2 s−1 in 1.0 M KOH solution) and
small overpotentials at 10 mA cm–2 (13.5 mV in 0.5 M H2SO4 solution; 17.0 mV in 1.0 M
KOH solution) as well as superior stability in both acidic and alkaline media. These
performances are comparable to, or even better than, the Pt/C catalyst for the HER. |
E-mail |
javeed@unist.ac.kr |
|