Architecting a Mesoporous N-Doped Graphitic Carbon Framework Encapsulating CoTe2 as an Efficient Oxygen Evolution Electrocatalyst
Architecting a Mesoporous N-Doped Graphitic Carbon Framework Encapsulating CoTe2 as an Efficient Oxygen Evolution Electrocatalyst
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构建封装 CoTe2 的介孔 N 掺杂石墨碳框架作为高效析氧电催化剂
DOI：
10.1021/acsami.7b09897
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发表时间：
2017
影响因子：
9.5
通讯作者：
Zhang Jun
中科院分区：
文献类型：
--
作者：
Liu Ming;Lu Xiaoqing;Guo Chen;Wang Zhaojie;Li Yanpeng;Lin Yan;Zhang Jun
为了提高用于水电解的钴基催化剂的效率，已经做出了巨大的努力来调整材料的组成、形态、尺寸和结构。我们在这里报告了一个简单的制备正交CoTe 2纳米晶体嵌入在N掺杂的石墨碳基质，形成一个三维结构的尺寸为1500 nm和丰富的介孔的144 nm的析氧反应（OER）。该混合电催化剂在10 mA cm-2下提供300 mV的小过电位，这远低于原始CoTe 2粉末。在循环2000次或连续驱动OER 20 h后，仅观察到轻微的损失。介孔三维结构和N掺杂石墨碳与CoTe 2之间的强相互作用是提高电催化性能的原因。
To improve the efficiency of cobalt-based catalysts for water electrolysis, tremendous efforts have been dedicated to tuning the composition, morphology, size, and structure of the materials. We report here a facile preparation of orthorhombic CoTe2nanocrystals embedded in an N-doped graphitic carbon matrix to form a 3D architecture with a size of ∼500 nm and abundant mesopores of ∼4 nm for the oxygen evolution reaction (OER). The hybrid electrocatalyst delivers a small overpotential of 300 mV at 10 mA cm–2, which is much lower than that for pristine CoTe2powder. After cycling for 2000 cycles or driving continual OER for 20 h, only a slight loss is observed. The mesoporous 3D architecture and the strong interaction between N-doped graphitic carbon and CoTe2are responsible for the enhancement of the electrocatalytic performance.