Transforming bulk alloys into nanoporous lanthanum-based perovskite oxides with high specific surface areas and enhanced electrocatalytic activities
Transforming bulk alloys into nanoporous lanthanum-based perovskite oxides with high specific surface areas and enhanced electrocatalytic activities
复制标题
将块状合金转化为具有高比表面积和增强电催化活性的纳米多孔镧基钙钛矿氧化物
DOI：
10.1039/c8ta07182a
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发表时间：
2018-11-07
影响因子：
11.9
通讯作者：
Zhang, Zhonghua
中科院分区：
文献类型：
--
作者：
Si, Conghui;Zhang, Chi;Zhang, Zhonghua
通过常规合成途径获得的钙钛矿氧化物的有限表面积通常限制了其催化性能。制造具有大量介孔的纳米多孔钙钛矿氧化物是实现钙钛矿用于能量转换和存储应用的潜力的关键挑战之一。在这里，我们报告了一种新的，简便的合成路线，利用去合金化过程将大块合金转化为纳米多孔镧（La）基钙钛矿氧化物。合成的La基钙钛矿显示出8.10-20.13 m2 g-1范围内的超高比表面积和独特的韧带状多孔框架。我们系统的ORR和OER测试显示了它们在碱性溶液中的高电催化活性和耐久性，这与密度泛函理论（DFT）计算一致。本文报道的合成路线开辟了一条新的途径，可以创造新一代功能性钙钛矿氧化物，适用于其他催化和电化学应用。
The limited surface area of a perovskite oxide obtained through a conventional synthesis route has often limited its catalytic performance. Creating nanoporous perovskite oxides with abundant amounts of mesopores is one of the key challenges to realize perovskite potential for energy conversion and storage applications. Here, we report a novel, facile synthesis route that exploits the de-alloying process to transform bulk alloys into nanoporous lanthanum (La)-based perovskite oxides. The synthesized La-based perovskites display ultrahigh specific surface areas in the range of 8.10–20.13 m2 g−1 and a unique ligament-like porous framework. Our systematic ORR and OER tests revealed their high electrocatalytic activity and durability in an alkaline solution, which are consistent with the density functional theory (DFT) calculations. The synthesis route reported here opens up a new avenue to create a new generation of functional perovskite oxides that are applicable to other catalytic and electrochemical applications.