Auto-programmed synthesis of metallic aerogels: Core-shell Cu@Fe@Ni aerogels for efficient oxygen evolution reaction
Auto-programmed synthesis of metallic aerogels: Core-shell Cu@Fe@Ni aerogels for efficient oxygen evolution reaction
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DOI：
10.1016/j.nanoen.2020.105644
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发表时间：
2021-03-01
期刊：
影响因子：
17.6
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Jiang, Bo;Wan, Zhe;Yamauchi, Yusuke
多孔金属气凝胶具有高导电性、低密度、高表面积等特点，是一种新型的催化材料。然而，探索具有核-壳结构的过渡金属基气凝胶仍然是一个根本性的挑战。在这里，我们报告了一种一步自动编程合成方法来生成核壳Cu@Fe@Ni金属气凝胶。电活化（EA）核壳Cu@Fe@Ni使Fe内壳迁移到Ni外壳，并在气凝胶表面形成高活性的催化氢氧化物。所得EA-Cu@Fe@Ni催化剂在10 mA cm（-2）下OER过电位为240 mV，远小于双金属CuNi （320 mV）、CuFe （390 mV）和RuO2 （271 mV）。现场拉曼测量证实，在电化学活化过程中，催化剂的外层由掺杂Fe的NiOOH组成，从而获得了较高的OER性能。这项工作描述了一步合成三金属核-壳气凝胶的第一个例子，并通过表面重建实现了设计高活性金属/金属氧化物电催化剂的另一种策略。
Porous metallic aerogels are a new class of cutting-edge materials useful in catalysis because they combine high conductivity with low density and high surface area. However, the exploration of transition metal-based aerogels with core-shell architectures remains a fundamental challenge. Here, we report a one-step auto-programmed synthesis method to generate a core-shell Cu@Fe@Ni metallic aerogel. Electroactivating (EA) the core-shell Cu@Fe@Ni causes the Fe inner shell to migrate into the Ni outer shell and forms a highly-active catalytic hydroxide on the surface of the aerogel. The resulting EA-Cu@Fe@Ni catalysts exhibited a low OER overpotential of 240 mV at 10 mA cm(-2), which is much smaller than bimetallic CuNi (320 mV), CuFe (390 mV), and RuO2 (271 mV). In-situ Raman measurements confirm that the catalyst's outer layer is composed of NiOOH doped with Fe during the electrochemical activation process, resulting in the high OER performance. This work describes the first example of a trimetallic core-shell aerogel synthesized in one step and enables another strategy for designing highly active metals/metal oxide electrocatalysts via surface reconstruction.