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Construction of interfacial engineering on CoP nanowire arrays with CoFe-LDH nanosheets for enhanced oxygen evolution reaction
FlatChem ( IF 6.2 ) Pub Date : 2021-01-28 , DOI: 10.1016/j.flatc.2021.100225
Hao Feng , Xun Sun , Xin Guan , Dengchao Zheng , Wenli Tian , Chengyi Li , Chuiyu Li , Minglei Yan , Yadong Yao

Transition metal phosphides have recently emerged as promising alternatives for oxygen evolution reaction (OER). Herein, the OER performance of CoP nanowires was significantly enhanced by coupling with the cobalt-iron layered double hydroxide (CoFe-LDH) nanosheets. The three-dimensional (3D) CoP@CoFe-LDH nanoarays heterostructure was fabricated by the sequential steps of hydrothermal process, phosphorization and electrodeposition. The as-prepared CoP@CoFe-LDH possesses well core–shell structure with a synergistic heterointerface between CoP and CoFe-LDH, in which the CoP core improves the conductivity and the CoFe-LDH shell affords abundant active sites. Furthermore, the 3D hierarchical architecture facilitates the electrolyte ions access and O2 gas liberation. Consequently, the optimized CoP@CoFe-LDH exhibits excellent OER performance with low overpotential (240 mV @ 40 mA cm−2), small Tafel slope (69.2 mV dec-1), superior intrinsic activity and high stability in 1 M KOH. This study demonstrates an efficient route to design the advanced OER catalysts by constructing the 3D core–shell heterostructure.



中文翻译:

使用CoFe-LDH纳米片在CoP纳米线阵列上构建界面工程以增强氧释放反应

过渡金属磷化物最近已成为 氧气释放反应(OER)的有希望的替代品。在此,通过与钴-铁层状双氢氧化物(CoFe-LDH)纳米片耦合,CoP纳米线的OER性能得到了显着提高。通过水热工艺,磷化和电沉积的顺序步骤制造了三维(3D)CoP @ CoFe-LDH纳米线异质结构。所制备的CoP @ CoFe-LDH具有良好的核-壳结构,并在CoP和CoFe-LDH之间具有协同的异质界面,其中CoP核提高了电导率,而CoFe-LDH壳提供了丰富的活性位点。此外,3D分层体系结构有助于电解质离子的进入和O 2气体解放。因此,优化的CoP @ CoFe-LDH表现出优异的OER性能,具有低过电势(240 mV @ 40 mA cm -2),小的Tafel斜率(69.2 mV dec -1),优异的固有活性和在1 M KOH中的高稳定性。这项研究表明,通过构建3D核-壳异质结构,可以设计高级OER催化剂的有效途径。

更新日期:2021-02-01
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