Highly exposed ruthenium-based electrocatalysts from bimetallic metal-organic frameworks for overall water splitting

By Tianjie Qiu, Zibin Liang, Wenhan Guo, Song Gao, Chong Qu, H. Tabassum, Hao Zhang, B. Zhu, R. Zou, Yang Shao-Horn. Nano Energy, 2019

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Abstract 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 cmgeo−2 at an overpotential of 22.7 mV, and shows an ultrahigh turnover frequency of 1.79 H2 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.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/ee2a944991d75b17ebb7854e2c16e71387d17391