Developing a cost-effective, scalable, and efficient electrocatalyst for the hydrogen evolution reaction (HER) is the heart of producing pure hydrogen in practical applications. In this work, a unique approach to allow ruthenium (Ru) nanoparticles on carboxyl-functionalized porous sphere carbon (CF-Ru@PSC) for an aqueous Zn-CO2 system is reported. The CF-Ru@PSC catalyst was produced by inducing additional junction sites between metallic Ru and the carbon substrate for enhanced HER properties under a CO2 saturated condition. The strongly bonded Ru-C caused electron transfer from the bottom side of the metallic Ru to the PSC substrate, leading to efficient hydrogen adsorption energy of the surface. The DFT calculations and XAFS investigation suggested that the reconstructed electronic configuration from the Ru-C linkage acted as an efficient active site for HER. The CF-Ru@PSC electrocatalyst presented a high turnover frequency of 2.70H2 s-1 at an overpotential of 0.20 V in the CO2-saturated condition and high Faraday efficiency (98.2%) over 1000 min in the aqueous Zn-CO2 system.
Bibliographical noteFunding Information:
This research was supported by the Creative Research Initiative (CRI, 2014R1A2069102), BK21 Plus (10Z20130011057), Science Research Center (SRC, 2016R1A5A1009405) and Young Researcher (2019R1C1C1006650) Programs through the National Research Foundation (NRF) of Korea, funded by the Ministry of Science, ICT, and Future Planning. This work was also supported by the Global PhD Fellowship Program through NRF Grant funded by the Korean Government (NRF-2018H1A2A1060644), and the Mid-Career Researcher Program (NRF-2018R1A2A1A05077532) through the National Research Foundation Korea, funded by the Ministry of Science, ICT, and Future Planning. This work was also supported by “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDA21000000; the K. C.Wong Education Foundation, Grant No. GJTD-2018-10, and Youth Innovation Promotion Association (grant no. 2014237), Chinese Academy of Sciences. This work was also supported by the 2020 Research Fund of KOREA East-West Power Co., LTD (EWP) (2.190769.01).
© The Royal Society of Chemistry.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)