Layered NiFe-LDH grown on porous carbon nested in nickel foam or nickel net toward oxygen evolution reaction at large current density

Abstract

Nickel‒iron layered double hydroxide (NiFe-LDH) demonstrates outstanding catalytic performance for the oxygen evolution reaction (OER) in alkaline media. Herein a general strategy is proposed for fabricating a series of electrodes consisting of NiFe-LDH grown on porous carbon nested in nickel foam (NF) or nickel net (NN). The electrodes exhibit significant OER activity and stability. The porous carbon nested in NF or NN provides a large specific surface area, enabling substantial loading of NiFe-LDH and thereby increasing the number of active sites, which enhances the overall OER catalytic performance. As a result, the NiFe-LDH/C-NF-M-0.1-1200 electrode only requires overpotentials of ~230 and ~280 mV to drive a current density of 100 and 800 mA·cm⁻² in 1.0 mol·L⁻¹ KOH, respectively. Moreover, it operates stably at 500 mA·cm⁻² for 14 h. This strategy provides a new approach for the rational design of efficient electrocatalysts for electrochemical applications.

Graphical abstract

Keywords

NiFe-LDH / oxygen evolution reaction / water splitting / porous carbon

References

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