Journal
NANO ENERGY
Volume 58, Issue -, Pages 1-10Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.12.085
Keywords
Ruthenium; Metal-organic frameworks; Electrocatalysis; Hydrogen evolution reaction; Water splitting
Categories
Funding
- National Natural Science Foundation of China [51825201]
- National Key Research and Development Program of China [2017YFA0206701]
- National Program for Support of Top-notch Young Professionals
- Changjiang Scholar Program
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The development of highly exposed active sites and highly active inexpensive electrocatalysts is important and challengeable for electrocatalytic hydrogen evolution reaction (HER). Herein, we report a bimetallic metal-organic frameworks based strategy to fabricate Ru-based electrocatalysts with high exposure of the Ru active sites (Ru-HPC, ruthenium-decorated hierarchically porous carbon) for high efficient hydrogen evolution. Remarkably, Ru-HPC achieves a current density of 25 mA cm(geo)(-2) at an overpotential of 22.7 mV, and shows an ultrahigh turnover frequency of 1.79 H-2 s(-1) at 25 mV, which is almost twice higher than that of commercial Pt/C. The electrochemical HER performance of Ru-HPC surpasses most of the electrocatalysts reported so far in alkaline solutions. Besides, a two-electrode water splitting device is constructed with Ru-HPC and porous RuO2 (obtained by oxidizing Ru-HPC) as electrode materials, which achieves a current density of 10 mA cm(-2) at only 1.53 V. This work provides a facile strategy to fabricate high-performance metal-carbon hybrid electrocatalysts with abundant exposed active sites from bimetallic MOFs, which can hopefully be applied to many other metals-carbon hybrids for various electrochemical applications in the foreseeable future.
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