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Tailoring the Surface of Perovskite through In Situ Growth of Ru/RuO2 Nanoparticles as Robust Symmetrical Electrodes for Reversible Solid Oxide Cells
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2020-09-13 , DOI: 10.1002/admi.202000828
Junkai Wang 1 , Jun Zhou 1 , Jiaming Yang 1 , Dragos Neagu 2 , Lei Fu 1 , Zhongjie Lian 1 , Tae‐Ho Shin 3 , Kai Wu 1
Affiliation  

Although numerous perovskite oxides can enhance the electrochemical activity via exsolved metallic nanoparticles on the surface, most of them can only be applied as catalysts in a reducing atmosphere. These nanoparticles cause serious performance degradation in oxidizing conditions due to the formation of low‐conductive metal oxides. This poses a big challenge to the design of highly active catalysts of electrochemical devices, especially for symmetrical solid oxide cells. Herein, based on the strategy of exsolved metallic nanoparticles in A‐site deficient perovskite, a unique and simple method is demonstrated for the synthesis of Ru/RuO2 nanoparticles on the surface of perovskite oxide via in situ growth. The electrode material (La0.75Sr0.25)0.9Cr0.5Mn0.45Ru0.05O3−δ (LSCMR) is designed through careful choice of composition and the core idea is to make use of the exsolved nanoparticles concept applied for the first time at both hydrogen electrode and oxygen electrode for symmetrical solid oxide cells. Inspired by exsolved Ru and RuO2, the surface‐decorated LSCMR exhibits significantly enhanced electrochemical activity for both H2 and O2, respectively, accompanied by high redox long‐term stability. Moreover, simple, low‐cost, and environmental‐friendly synthesis of Ru/RuO2 nanoparticles on the substrate of typical perovskites is realized with this in situ growth approach.

中文翻译:

通过Ru / RuO2纳米粒子的原位生长作为可逆固体氧化物电池的鲁棒对称电极来调整钙钛矿的表面

尽管许多钙钛矿氧化物可以通过表面上溶解的金属纳米颗粒增强电化学活性,但大多数只能在还原性气氛中用作催化剂。由于形成低导电金属氧化物,这些纳米颗粒在氧化条件下导致严重的性能下降。这对电化学装置的高活性催化剂的设计提出了很大的挑战,特别是对于对称固体氧化物电池。本文中,基于在A位缺陷型钙钛矿中溶解金属纳米颗粒的策略,展示了一种独特而简单的方法,可通过原位生长在钙钛矿氧化物表面合成Ru / RuO 2纳米颗粒。电极材料(La 0.75 Sr 0.250.9Cr 0.5 Mn 0.45 Ru 0.05 O 3− δ(LSCMR)是通过仔细选择成分而设计的,其核心思想是利用首次应用于对称固体氧化物电池的氢电极和氧电极的溶解纳米颗粒概念。受溶解的Ru和RuO 2的启发,表面修饰的LSCMR分别对H 2和O 2表现出显着增强的电化学活性,并具有较高的氧化还原长期稳定性。此外,Ru / RuO 2的简单,低成本和环保合成 这种原位生长方法可实现典型钙钛矿基质上的纳米颗粒。
更新日期:2020-09-13
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