Fabrication of Trimetallic Fe–Co–Ni Electrocatalysts for Highly Efficient Oxygen Evolution Reaction

Abstract

The development of inexpensive and well-activated water-splitting catalysts is required to reduce the use of conventional fossil fuels. In this study, a trimetallic Fe−Co−Ni catalyst was fabricated using a simple ion electrodeposition method. The metal deposition was performed using cyclic voltammetry, which was more efficient than constant-voltage deposition and significantly increased the stability of the catalyst. The synthesized material presented the morphology of a nanoflower in which the nanosheets were agglomerated. The Fe−Co−Ni catalyst exhibited excellent oxygen evolution reaction (OER) properties because the charge-transfer rate was improved owing to the synergistic effect of the metals. The OER was performed in a 1 M KOH solution using a three-electrode system, and the overpotential was 302 mV at 100 mA/cm 2 . In addition, the Fe−Co−Ni catalyst exhibited excellent stability in alkaline solution for more than 48 h at 200 mA/cm 2 . The results show that the method for preparing Fe−Co−Ni significantly improves its catalytic activity, and the resulting material could be used as an economical and efficient catalyst in future.

Synergistic effect of ultrasound and reinforced electrical environment by bioinspired periosteum for enhanced osteogenesis via immunomodulation of macrophage polarization through Piezo1

“…On account of their high tensile strength, MWCNTs can also serve as bone substitutes when filled with calcium and shaped or arranged to mimic bone structure [ 32 ]. Moreover, cellular adhesion and proliferation can be enhanced with MWCNT composites, and therefore, MWCNTs have been integrated into Col to generate the biomimetic periosteum in this study [ 33 ]. On the other hand, living bone generates electrical signals by the application of mechanical stress due to the presence of piezoelectric collagen [ 34 ].…”