Carbon fiber paper supported interlayer space enlarged Ni2Fe-LDHs improved OER electrocatalytic activity

• Published in: Electrochimica acta Vol. 258; pp. 554 - 560
• Main Authors: Zhong, Haihong, Cheng, Xiaokang, Xu, Hantao, Li, Lin, Li, Dianqing, Tang, Pinggui, Alonso-Vante, Nicolas, Feng, Yongjun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.12.2017
• Subjects: Composite materials; Intercalation; Interlayer distance; Layered double hydroxides (LDH); Oxygen evolution reaction; Layered double hydroxides (LDH); Composite materials; Oxygen evolution reaction; Interlayer distance; Intercalation
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2017.11.098

Herein, a series of three-dimensional Ni2Fe-SDS-LDH/CFP non-precious metal electrocatalysts in a simple hydrothermal route using sodium dodecyl sulfonate (SDS) as an interlayer spacer agent, and carbon fiber paper (CFP) as a conductive substrate was tailored. The electrocatalytic performance towards oxygen evolution reaction (OER) in alkaline medium was investigated. The results demonstrate that the OER activity improvement is mainly related to the increased interlayer distance from 0.76 nm to 2.49 nm depending on the intercalated amount of SDS in Ni2Fe-LDH, and resulting in the enhanced superior surface characteristics (e.g., larger specific surface area, bigger pore size and pore volume). Among all the samples, the Ni2Fe-SDS-LDH/CFP (molar ratio SDS/Fe = 1.5) showed the best OER performance (η@10 mA cm−2 = 289 mV, Tafel slope = 39 mV dec−1) comparable with the commercial IrO2 catalyst, which corresponded to the largest interlayer space of 2.49 nm. A series of three-dimensional Ni2Fe-SDS-LDH/CFP non-precious metal electrocatalysts in a simple hydrothermal route using sodium dodecyl sulfonate (SDS) as an interlayer spacer agent, and carbon fiber paper (CFP) as a conductive substrate was tailored. The electrocatalytic performance towards oxygen evolution reaction (OER) in alkaline medium was investigated. The results demonstrate that the OER activity improvement is mainly related to the increased interlayer distance from 0.76 nm to 2.49 nm, depending on the intercalation amount of SDS in the Ni2Fe-LDH. Among all samples, the Ni2Fe-SDS-LDH/CFP (molar ratio SDS/Fe = 1.5) showed the best OER performance (η@10 mA cm−2 = 289 mV, Tafel slope = 39 mV dec−1) comparable with the commercial IrO2 catalyst, which corresponded to the largest interlayer space of 2.49 nm. [Display omitted] •SDS intercalated Ni2Fe-LDHs with different interlayer distances were prepared.•OER activity of Ni2Fe-SDS-LDH/CFP were related with the interlayer distance.•Electrocatalytic performance is higher than commercial IrO2 in alkaline medium.