超低负载量 Ru 作为固体氧化物电池氧电极双功能催化剂,ACS Catalysis

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超低负载量 Ru 作为固体氧化物电池氧电极双功能催化剂
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-08-08 , DOI: 10.1021/acscatal.3c02544
Haoyu Li ₁ , Hyong June Kim ₂ , ThomasJae Garcia ₁ , Geonwoo Park ₂ , Yong Ding ₃ , Meilin Liu ₃ , Jihwan An ₄ , Min Hwan Lee ₁

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析氧反应（OER）是固体氧化物电解槽电池（SOEC）中电池过电势的重要贡献者。尽管Ru和Ir等贵金属已被用作OER催化剂，但其在SOEC中的广泛应用因其高成本和有限的可用性而受到阻碍。_{在这项研究中，我们提出了一种高效的方法，通过在 (La 0.6} Sr _0.4 ) _0.95 Co _0.2 Fe _0.8 O _3-δ上沉积薄至 ∼7.5 Å 的超薄金属 Ru 层来增强空气电极的性能和耐用性（ LSCF）使用等离子体增强原子层沉积（PEALD）。我们的研究表明，钙钛矿 SrRuO ₃的出现是由 PEALD 基 Ru 和表面偏析的 Sr 物质之间的反应产生的，在抑制 Sr 偏析和维持有利的氧解吸动力学方面发挥着至关重要的作用，从而最终提高了 OER 耐久性。此外，LSCF 上的 PEALD Ru 涂层还降低了对氧还原反应 (ORR) 的阻力，突出了可逆燃料电池的双功能电催化活性。当测试电池的 LSCF 电极装饰有 ∼7.5 Å 的 Ru 涂层时，电解模式下 1.3 V 下的电流密度为 656 mA cm ^–2 ，燃料电池模式下的峰值功率密度为 803 mW cm ^–2 。在 700 °C 下证明，与原始电池相比，分别提高了 49.1% 和 31.9%。

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Ultralow Loading of Ru as a Bifunctional Catalyst for the Oxygen Electrode of Solid Oxide Cells

The oxygen evolution reaction (OER) is a significant contributor to the cell overpotential in solid oxide electrolyzer cells (SOECs). Although noble metals such as Ru and Ir have been utilized as OER catalysts, their widespread application in SOECs is hindered by their high cost and limited availability. In this study, we present a highly effective approach to enhance air electrode performance and durability by depositing an ultrathin layer of metallic Ru, as thin as ∼7.5 Å, onto (La_0.6Sr_0.4)_0.95Co_0.2Fe_0.8O_3-δ (LSCF) using plasma-enhanced atomic layer deposition (PEALD). Our study suggests that the emergence of a perovskite, SrRuO₃, resulting from the reaction between PEALD-based Ru and surface-segregated Sr species, plays a crucial role in suppressing Sr segregation and maintaining favorable oxygen desorption kinetics, which ultimately improves the OER durability. Further, the PEALD Ru coating on LSCF also reduces the resistance to the oxygen reduction reaction (ORR), highlighting the bifunctional electrocatalytic activities for reversible fuel cells. When the LSCF electrode of a test cell is decorated with ∼7.5 Å of the Ru overcoat, a current density of 656 mA cm^–2 at 1.3 V in electrolysis mode and a peak power density of 803 mW cm^–2 in fuel cell mode are demonstrated at 700 °C, corresponding to an enhancement of 49.1 and 31.9%, respectively, compared to the pristine cell.

更新日期：2023-08-08

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