Ruthenium containing molecular electrocatalyst on glassy carbon for electrochemical water splitting

Lin Li; Biswanath Das; Ahibur Rahaman; Andrey Shatskiy; Fei Ye; Peihong Cheng; Chunze Yuan; Zhiqi Yang; Oscar Verho; Markus D. Kärkäs; Joydeep Dutta; Tsu-Chien Weng; Björn Åkermark

doi:10.1039/D2DT00824F

Ruthenium containing molecular electrocatalyst on glassy carbon for electrochemical water splitting†

Lin Li,

‡*^abc Biswanath Das,

‡*^b Ahibur Rahaman,^b Andrey Shatskiy,

^d Fei Ye,^e Peihong Cheng,^a Chunze Yuan,^ac Zhiqi Yang,^a Oscar Verho,*^b Markus D. Kärkäs,

^d Joydeep Dutta,

^e Tsu-Chien Weng^ac and Björn Åkermark

*^b

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* Corresponding authors

^a School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
E-mail: lilin1@shanghaitech.edu.cn

^b Department of Organic Chemistry, Arrhenius Laboratory Stockholm University, Svante Arrhenius v-g 16C, 10691 Stockholm, Sweden
E-mail: bjorn.akermark@su.se, oscar.verho@ilk.uu.se, Das.Biswanath85@gmail.com

^c Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China

^d Department of Chemistry, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden

^e Department of Applied Physics, Functional Materials, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden

Abstract

Electrochemical water splitting constitutes one of the most promising strategies for converting water into hydrogen-based fuels, and this technology is predicted to play a key role in the transition towards a carbon-neutral energy economy. To enable the design of cost-effective electrolysis cells based on this technology, new and more efficient anodes with augmented water splitting activity and stability will be required. Herein, we report an active molecular Ru-based catalyst for electrochemically-driven water oxidation (overpotential of ∼395 mV at pH 7 phosphate buffer) and two simple methods for preparing anodes by attaching this catalyst onto glassy carbon through multi-walled carbon nanotubes to improve stability as well as reactivity. The anodes modified with the molecular catalyst were characterized by a broad toolbox of microscopy and spectroscopy techniques, and interestingly no RuO₂ formation was detected during electrocatalysis over 4 h. These results demonstrate that the herein presented strategy can be used to prepare anodes that rival the performance of state-of-the-art metal oxide anodes.

Dalton Transactions

Ruthenium containing molecular electrocatalyst on glassy carbon for electrochemical water splitting†

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Ruthenium containing molecular electrocatalyst on glassy carbon for electrochemical water splitting

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