Co3O4-x-Carbon@Fe2-yCoyO3 Heterostructural Hollow Polyhedrons for the Oxygen Evolution Reaction.
Co3O4-x-Carbon@Fe2-yCoyO3 Heterostructural Hollow Polyhedrons for the Oxygen Evolution Reaction.
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DOI：
10.1021/acsami.7b09213
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发表时间：
2017-08
影响因子：
9.5
通讯作者：
Wangwang Xu;W. Xie;Ying Wang
中科院分区：
文献类型：
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作者：
Wangwang Xu;W. Xie;Ying Wang
中空异质结构纳米材料在新一代电催化剂中的应用引起了人们极大的兴趣。然而，这种材料的设计和制造仍然是一个重大的挑战。在这项工作中，我们提出了Co 3 O 4-x-carbon@ Fe 2-yCoyO 3异质结构中空多面体，其已经通过简单的热处理，然后通过溶液相生长制备，用于作为有效的析氧反应（OER）电催化剂。从单个ZIF-67空心多面体出发，成功制备了一种由Co 3 O 4-x纳米晶嵌入碳基体并嵌入Fe 2-yCoyO 3纳米线的新型复杂结构复合材料。具有氧空位的Co 3 O 4-x纳米微晶为Fe 2-yCoyO 3纳米线的生长提供了异质形核和生长平台。所得的异质结构结合了Fe 2-yCoyO 3纳米线的优点与Co 3 O 4-x纳米微晶的大表面积和表面缺陷，从而提高了电催化活性和电导率。结果，这种新型异质结构OER电催化剂表现出比Co 3 O 4-x-碳中空多面体（起始1.55 V，在1.7 V下为35 mA/cm 2）和纯Co 3 O 4中空多面体（起始1.62 V，在1.7 V下为5 mA/cm 2）低得多的起始电位（1.52 V）和高得多的电流密度（在1.7 V下为70 mA/cm 2）。此外，在这项工作中的金属有机框架（MOF）衍生的纳米材料的设计和合成提供了新的机会，开发新的和有效的电催化剂在电化学装置。
Hollow heterostructured nanomaterials have received tremendous interest in new-generation electrocatalyst applications. However, the design and fabrication of such materials remain a significant challenge. In this work, we present Co3O4-x-carbon@Fe2-yCoyO3 heterostructural hollow polyhedrons that have been fabricated by facile thermal treatment followed by solution-phase growth for application as efficient oxygen evolution reaction (OER) electrocatalysts. Starting from a single ZIF-67 hollow polyhedron, a novel complex structured composite material constructed from Co3O4-x nanocrystallite-embedded carbon matrix embedded with Fe2-yCoyO3 nanowires was successfully prepared. The Co3O4-x nanocrystallite with oxygen vacancies provides both heterogeneous nucleation sites and growth platform for Fe2-yCoyO3 nanowires. The resultant heterostructure combines the advantages of Fe2-yCoyO3 nanowires with the large surface area and surface defects of Co3O4-x nanocrystallite, resulting in improved electrocatalytic activity and electrical conductivity. As a result, such novel heterostructured OER electrocatalysts exhibit much lower onset potential (1.52 V) and higher current density (70 mA/cm2 at 1.7 V) than Co3O4-x-carbon hollow polyhedrons (onset 1.55 V, 35 mA/cm2 at 1.7 V) and pure Co3O4 hollow polyhedrons (onset 1.62 V, 5 mA/cm2 at 1.7 V). Furthermore, the design and synthesis of metal-organic framework (MOF)-derived nanomaterials in this work offer new opportunities for developing novel and efficient electrocatalysts in electrochemical devices.