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Rational Design of Dimensionally Stable Anodes for Active Chlorine Generation
ACS Catalysis ( IF 11.3 ) Pub Date : 2021-09-23 , DOI: 10.1021/acscatal.1c03653
Hyun Woo Lim 1 , Deok Ki Cho 1 , Jae Hyun Park 1 , Su Geun Ji 1 , You Jin Ahn 1 , Jin Young Kim 1, 2, 3 , Chan Woo Lee 4
Affiliation  

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 (∼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 °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.

中文翻译:

活性氯发生尺寸稳定阳极的合理设计

RuO 2是最重要的电催化剂材料之一,作为用于析氯反应的尺寸稳定阳极(DSA)的关键组分,因为其具有高催化活性,而阳极腐蚀仍然是必须解决的基本挑战。在这里,我们证明了负载在 Nb 掺杂的 TiO 2上的 RuO 2纳米颗粒(~1.7 nm)的低温退火导致形成耐用的活性位点,该活性位点对活性氯的产生具有优异的活性和产品选择性(10 mA cm –2 at 22 mV 过电位,在 0.6 M NaCl 中法拉第效率为 97.3%,远优于商业 DSA)。Nb 掺杂不仅提高了 TiO 2的电子电导率支持,而且还可以使 Ti 原子在仅 200 °C 的温度下热扩散到 RuO 2晶格中,形成具有超薄 TiO 2表面作为保护层的超细固溶体纳米粒子。这项工作提供了一种用于阳极反应的稳定 RuO 2电催化剂的低成本制造策略,以及对 DSA 设计原理的额外见解。
更新日期:2021-10-15
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