Nano-Micro Letters

A Superaerophobic Bimetallic Selenides Heterostructure for Efficient Industrial-Level Oxygen Evolution at Ultra-High Current Densities

Jiaxin Yuan1, Xiaodi Cheng1, Hanqing Wang1, Chaojun Lei1, Sameer Pardiwala1, Bin Yang1, Zhongjian Li1, Qinghua Zhang4, Lecheng Lei1, Shaobin Wang5, *, Yang Hou1, 2, 3, *

Abstract | Support Info
icon-htmlFull Text Html
icon-pdf-smPDF w/ Links
icon-citExport Citation
Figures
+Show more

Nano-Micro Lett. (2020) 12: 104

First Online: 02 May 2020 (Communication)

DOI:10.1007/s40820-020-00442-0

*Corresponding author. E-mail: yhou@zju.edu.cn (Yang Hou); shaobin.wang@adelaide.edu.au (Shaobin Wang)

 

Abstract

 


Toc

Cost-effective and stable electrocatalysts with ultra-high current densities for electrochemical oxygen evolution reaction (OER) are critical to the energy crisis and environmental pollution. Herein, we report a superaerophobic three dimensional (3D) heterostructured nanowrinkles of bimetallic selenides consisting of crystalline NiSe2 and NiFe2Se4 grown on NiFe alloy (NiSe2/NiFe2Se4@NiFe) prepared by a thermal selenization procedure. In this unique 3D heterostructure, numerous nanowrinkles of NiSe2/NiFe2Se4 hybrid with a thickness of ~100 nm is grown on NiFe alloy in a uniform manner. Profiting by the large active surface area and high electronic conductivity, the superaerophobic NiSe2/NiFe2Se4@NiFe heterostructure exhibits excellent electrocatalytic activity and durability towards OER in alkaline media, outputting the low potentials of 1.53 and 1.54 V to achieve ultra-high current densities of 500 and 1,000 mA cm-2, respectively, which is among the most active Ni/Fe based selenides, and even superior to the benchmark Ir/C catalyst. The in-situ derived FeOOH and NiOOH species from NiSe2/NiFe2Se4@NiFe are deemed to be efficient active sites for OER.


 

Keywords

Superaerophobicity, Bimetallic selenide, Heterostructure electrocatalyst, Strong interfacial coupling, Oxygen evolution reaction

 View: Full Text HTML | PDF w/ Links