Iron-cobalt alloy is a potential and economical magnetostrictive material, however, our microscopic understanding of the co-electrodeposition process of Fe-Co alloys is still unsatisfactory. In this work, a flat Fe-Co film with 10 μm was successfully prepared by electrodeposition with a non-toxic sulfate solution. The effects of (NH 4 ) 2 SO 4 , an important additive, were studied and DFT calculation was used to analyze the mechanism of (NH 4 ) 2 SO 4 . EIS shows that (NH 4 ) 2 SO 4 can promote the Fe-Co co-deposition process and obviously inhibits the hydrogen evolution reaction. In addition, (NH 4 ) 2 SO 4 can significantly reduce the internal stress of the Fe-Co film by 110,000 MPa, so that the cracks caused by the internal stress are obviously removed. The results of quantum chemistry calculation further show that NH 4 + is more inclined to adsorb on Fe-Co surface than H 2 O and H + , which reduces the hydrogen evolution on the electrode surface. The results are beneficial to improve the Fe-Co co-deposition process, reduce the internal stress and to prepare a high-performance Fe-Co magnetic film. The films will be assembled on the electronic devices with sensors.
Graphical Peak Power ! Novel hybrid materials composed of N-doped carbon nanotubes (CNTs) with several embedded Fe−Co alloy nanoparticles (CNTs@(Fe,Co)PP) that can serve as highly efficient bifunctional oxygen electrocatalysts are derived from bimetallic Fe/Co-coordinated polyporphyrin-CNTs self-assemblies via pyrolysis. The optimal electrocatalyst is used at air electrode in zinc-air battery (ZAB) delivering a higher peak power density and showing a better long-term cycling stability than a ZAB containing the noble metal electrocatalysts Pt/C+RuO 2 . The design and fabrication of efficient, less costly, and stable bifunctional oxygen electrode electrocatalysts is crucial for large-scale production of rechargeable zinc-air batteries. Herein, electrocatalytically active, hybrid materials composed of Fe−Co alloy nanoparticles-embedded N-doped carbon nanotubes (CNTs) are synthesized from Fe/Co-polyporphyrin-CNTs via pyrolysis. The materials serve as highly effective bifunctional oxygen electrode catalysts for zinc-air batteries. In particular, the one synthesized at 700 °C, named CNTs@(Fe,Co)PP-700, shows a very good activity for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in an alkaline solution. This material catalyzes ORR with a limiting current density of 5.11 mA cm −2 and a half-wave potential of 0.86 V vs RHE. It also catalyzes OER with 10 mA cm −2 at a small overpotential of 360 mV. Besides, it operates well as an air cathode in a home-made rechargeable zinc-air battery, with a small voltage gap of 0.71 V at 2 mA cm −2 , while remaining stable in hundreds of charge-discharge cycles for >83 h. Its performance in a zinc-air battery is better than that of a benchmark air-electrode containing noble metals, Pt/C+RuO 2 .
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