Iron/nickel Alloy Nanoparticles Embedded in N-doped Porous Carbon for Robust Oxygen Evolution Reaction
Received date: 2018-08-30
Online published: 2018-11-28
Supported by
Project supported by the National Key Research and Development Program of China (No. 2016YFB0101202) and the National Natural Science Foundation of China (Nos. 91534205, 21436003).
Hydrogen, a clean, efficient and sustainable energy, can be produced via electrochemical water splitting, during which two key processes, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), occur simultaneously at the two electrodes of an electrolytic cell. Nevertheless compared to the two-electron process of HER, OER, a four-electron process, is of the inherently kinetic hysteresis step, which can dramatically diminish the overall energy conversion efficiency. The highly active noble-metal-based catalyst RuO2 is considered to be one of the most efficient state-of-the-art OER catalysts. However the high cost and element scarcity significantly hinder their practical applications. Thus it is particularly urgent to develop highly-active but low-cost non-noble-metal alternatives. Iron/nickel alloy based catalysts have been widely studied owing to their promising performances. In this work, we prepared iron/nickel alloy nanoparticles embedded in N-doped hierarchically porous carbon (Fe0.64Ni0.36@NC), by simultaneously adsorbing metal precursors and dopamine on surface of SiO2 macroporous hard templates, and then annealing the system and etching the templates. In electrochemical measurements, Fe0.64Ni0.36@NC shows a superior OER activity in alkaline solution, which only needs an overpotential as low as 286 mV to deliver a current density of 10 mA·cm-2, being significantly lower than the value of 380 mV for RuO2. Besides, the catalyst displays no obvious activity decrease after 2000 cycles of continuous CV scanning, corresponding to an excellent durability. The observed nice performances of the alloy catalyst in alkaline solution can be ascribed to two critical structural features:(1) the macroporous structures made by stacking of SiO2 microspheres own relatively thin layer of carbon framework, thus the embedded iron/nickel alloy particles can well activate the surrounding carbon layer to expose copious active sites; (2) the graphitized N-doped carbon layers well protect the alloy nanoparticles from corrosion, thus improving the durability of the catalysts. This work gave a nice design for the highly efficient non-noble-metal OER catalysts.
Wang Yilin , Wang Minjie , Li Jing , Wei Zidong . Iron/nickel Alloy Nanoparticles Embedded in N-doped Porous Carbon for Robust Oxygen Evolution Reaction[J]. Acta Chimica Sinica, 2019 , 77(1) : 84 -89 . DOI: 10.6023/A18080357
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