普鲁士蓝
材料科学
薄膜
析氧
电催化剂
过电位
介孔材料
分解水
化学工程
外延
纳米技术
电极
电化学
催化作用
化学
有机化学
光催化
工程类
物理化学
图层(电子)
作者
Lei Song,Qiaohong Li,Kang Yao,Zhengbiao Gu,Jian Zhang
标识
DOI:10.1016/j.apcatb.2018.12.036
摘要
The development of cost-effective, high-efficiency, and non-noble metal based electrocatalysts for oxygen evolution reaction (OER) is considered to be the most pivotal portion for electrochemical water splitting to generate renewable energy. Herein, well-aligned mesoporous CoFe2O4 thin film is first developed from surface epitaxial growth of oriented CoFe-based prussian blue analogue thin film (CoFe-PBA thin film) for efficient electrocatalytic OER. CoFe-PBA thin film with preferred [100] orientation is first prepared on the substrate surface by employing liquid phase epitaxial method without any structure-directing surfactants. After thermal pyrolysis, such CoFe-PBA thin film was transformed into well-aligned mesoporous CoFe2O4 thin film. Interestingly, the self-support CoFe2O4 thin film electrode with the mass loading of 1.6 mg cm−2 delivers an oxygen evolution current density of 10 mA cm−2 at an overpotential of 266 mV and exhibits durable stability in 1 M KOH aqueous solution. The remarkable and stable catalytic performance of the CoFe2O4 thin film can be mainly owing to the mesoporous structure of CoFe2O4, efficient charge/electron transfer, the numerous exposed active sites, and the well-structured configuration of the electrode. Hence, this work provides an effective paradigm for preparing binder-free, self-support, and low-cost spinel oxide electrocatalyst for efficient OER derived from surface epitaxial growth of oriented PBA thin film.
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