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Interface-Enhanced SiO/Ru Heterocatalysts for Efficient Electrochemical Water Splitting
Ting Zhu1, Junnan Han1, Teng Sun1
1School of Electronic Science and Engineering, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Nanjing University, Nanjing 210000, China.
Abstract:
Developing a bifunctional electrocatalyst with remarkable performance viable for overall water splitting is increasingly essential for industrial-scale renewable energy conversion. However, the current electrocatalyst still requires a large cell voltage to drive water splitting due to the unsuitable adsorption/desorption capacity of reaction intermediates, which seriously hinders the practical application of water splitting. Herein, a unique SiO/Ru nanosheet (NS) material was proposed as a high-performance electrocatalyst for overall water splitting. The SiO/Ru NSs show superior performance in the hydrogen evolution reaction with a low overpotential of 23 mV (@ 10 mA cm-2) and excellent stability for nearly 200 h (@ 10 mA cm-2) in 1 M KOH. By means of the introduction of SiO, it is beneficial for balancing the local charge density of the surrounding Ru sites. The suitable electronic coupling between the d-band electrons of Ru and the adsorbed species effectively balances the adsorption and desorption of reaction intermediates on the surface. As a result, the catalyst also exhibits overall water splitting activity with a cell voltage of only 1.496 V to reach the current density of 10 mA cm-2. The present work opens up a new strategy for designing high-performance electrocatalysts for water splitting.
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