Abstract
The electronic structure of active sites is critically important for electrochemical reactions. Here, the authors report a facile approach to independently regulate the electronic structure of Fe in Ni0.75Fe0.25Se2 by P doping. The resulting electrode exhibits superior catalytic performance for the oxygen evolution reaction (OER) showing a low overpotential (238 mV at 100 mA cm−2, 185 mV at 10 mA cm−2) and an impressive durability in an alkaline medium. Additionally, the mass activity of 328.19 A g−1 and turnover frequency (TOF) of 0.18 s−1 at an overpotential of 500 mV are obtained for P─Ni0.75Fe0.25Se2 which is much higher than that of Ni0.75Fe0.25Se2 and RuO2. This work presents a new strategy for the rational design of efficient electrocatalysts for OER.
Highlights
The nickel–iron (Ni–Fe)-based bimetal elec-Electrochemical water splitting using intermittent renewable energy is a highly attractive approach for producing hydrogen without CO2 emission.[1,2,3] The anodic oxygen evolution reaction (OER) is kinetically sluggish due to the four protoncoupled electron transfer kinetics and the oxygen─oxygen bond formation.[4,5,6,7] Currently, noble metal-based catalysts such as iridium and ruthenium oxides (IrO2 or RuO2) are recognized as the most active OER catalysts as precious metals, their cost and low earth abundance makes the technology competitively unviable against fossil fuels.[8]
We have developed a facile approach to independently regulate the electronic structure of Fe in Ni0.75Fe0.25Se2 nanosheets by P doping
A schematic of Ni0.75Fe0.25Se2 and its P doped analogue P─Ni0.75Fe0.25Se2 is outlined in Figure 1a with the synthetic route described in Scheme S1, Supporting Information
Summary
The nickel–iron (Ni–Fe)-based bimetal elec-Electrochemical water splitting using intermittent renewable energy is a highly attractive approach for producing hydrogen without CO2 emission.[1,2,3] The anodic oxygen evolution reaction (OER) is kinetically sluggish due to the four protoncoupled electron transfer kinetics and the oxygen─oxygen bond formation.[4,5,6,7] Currently, noble metal-based catalysts such as iridium and ruthenium oxides (IrO2 or RuO2) are recognized as the most active OER catalysts as precious metals, their cost and low earth abundance makes the technology competitively unviable against fossil fuels.[8].
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