Mesoporous Nanostructured CoFe–Se–P Composite Derived from a Prussian Blue Analogue as a Superior Electrocatalyst for Efficient Overall Water Splitting

• DOI: 10.1021/acsaem.8b00663
• Publication Date: 2018-07-05T19:31:34Z
• Authors: Linghao He; Bingbing Cui; Bin Hu; Jiameng Liu; Kuan Tian; Minghua Wang; Yingpan Song; Shaoming Fang; Zhihong Zhang; Qiaojuan Jia
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Electrocatalytic water splitting requires the development of attractive and earth-abundant catalysts. In this work, a novel four-part electrocatalyst of mesoporous cobalt/iron phosphorus–selenide nanocomposite (CoFe–Se–P) was derived from hollow CoFe Prussian blue analogues (CoFe-PBA) and combined by phosphatization and selenylation. This novel electrocatalyst displays an efficient and durable bifunctional catalysis performance for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In view of strong electron interaction among Co, Fe, Se, and P, this four-part electrocatalyst exhibits a lower onset potential of −35.9 mV and an overpotential of −172.5 mV at a current density of 10 mA cm–2 in acidic solution for HER. In alkaline solution, the onset potential and the overpotential are maintained at approximately −33 and −183.1 mV, respectively. Moreover, the proposed CoFe–Se–P catalyst possesses superior OER performance with a lower onset potential of 1.07 V and overpotential of 1.44 V at ...