Journal
ACS CATALYSIS
Volume 11, Issue 20, Pages 12423-12432Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c03653
Keywords
active chlorine generation; Niobium doping atomic diffusion; TiO2 passivation layer; RuO2 corrosion
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Funding
- National R&D Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Republic of Korea [2021M3H4A1A03057403]
- Carbon to X Project through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Republic of Korea [2020M3H7A1098229]
- National Research Foundation of Korea (NRF) - Creative Materials Discovery Program, South Korea [2017M3D1A1039377]
- Korean Government (MSIT) [NRF-2020R1C1C1010963]
- Nano Material Technology Development Program, South Korea [2016M3A7B4909369]
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET)
- Korea Smart Farm R&D Foundation (KosFarm) through Smart Farm Innovation Technology Development Program - Ministry of Agriculture, Food and Rural Affairs (MAFRA)
- Ministry of Science and ICT (MSIT), Rural Development Administration (RDA) [421036-03-1-GD030]
- National Research Foundation of Korea [2017M3D1A1039377, 2020M3H7A1098229, 2021M3H4A1A03057403] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study demonstrates a cost-effective and stable method for fabricating RuO2 electrocatalysts, providing insights into the design principles of DSAs.
RuO2 is one of the most important electrocatalyst materials as a key component of dimensionally stable anode (DSA) for chlorine evolution reaction, because of the high catalytic activity, while anodic corrosion remains a fundamental challenge that must be addressed. Here, we demonstrate that low-temperature annealing of RuO2 nanoparticles (similar to 1.7 nm) supported on Nb-doped TiO2 leads to the formation of durable active sites with superior activity and product selectivity toward active chlorine generation (10 mA cm(-2) at 22 mV overpotential with a Faradaic efficiency of 97.3% in 0.6 M NaCl, which is much better than that of commercial DSA). The Nb doping not only enhances the electronic conductivity of TiO2 support, but also enables thermal diffusion of Ti atoms into the RuO2 lattice at only 200 degrees C, forming ultrafine solid-solution nanoparticles with ultrathin TiO2 surface as a protective layer. This work provides a cost-effective fabrication strategy of stable RuO2 electrocatalysts for anodic reactions, as well as additional insights into the design principle of DSA.
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