Abstract
The development of active, acid-stable and low-cost electrocatalysts for oxygen evolution reaction is urgent and challenging. Herein we report an Iridium-free and low ruthenium-content oxide material (Cr0.6Ru0.4O2) derived from metal-organic framework with remarkable oxygen evolution reaction performance in acidic condition. It shows a record low overpotential of 178 mV at 10 mA cm−2 and maintains the excellent performance throughout the 10 h chronopotentiometry test at a constant current of 10 mA cm−2 in 0.5 M H2SO4 solution. Density functional theory calculations further revealed the intrinsic mechanism for the exceptional oxygen evolution reaction performance, highlighting the influence of chromium promoter on the enhancement in both activity and stability.
Highlights
The development of active, acid-stable and low-cost electrocatalysts for oxygen evolution reaction is urgent and challenging
The resulting Cr0.6Ru0.4O2 electrocatalyst exhibits an overpotential of 178 mV at 10 mA cm−2, a small Tafel slope (58 mV dec−1), and stable chronopotentiometric performance under 10 mA cm−2 in 0.5 M H2SO4 solution for 10 h, which outperforms the most active Oxygen evolution reaction (OER) electrocatalysts reported to date, such as BaYIrO623, IrOx/ SrIrO325, and Y2Ru2O7-δ27
The results show that the enhanced activity of OER performance of CrO2-RuO2 solid solution is not just enhanced by the electrochemically active surface area (ECSA), and the intrinsic activity arising from the color of MIL-101 (Cr) ions plays an more important role
Summary
The development of active, acid-stable and low-cost electrocatalysts for oxygen evolution reaction is urgent and challenging. Cr0.6Ru0.4O2 electrocatalyst annealed above 500 °C exhibited stable OER performance, with slight overpotential decrease (
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