No abstract

Nowadays, stainless steel (SS) based electrode has gained extensive interest for oxygen evolution reaction (OER) owing to its low-cost and high efficiency. However, the problem of hazardous Cr dissolving out from the SS during the surface treatment needs to be solved urgently. Herein, we report a kind of self-supported NiÀ Fe oxyhydroxide pagoda-shaped nano-cone array prepared through an environmentally friendly method, which can be developed as an electrocatalyst for OER with low overpotential, small Tafel slope, and good stability under alkaline condition. This route ensures good catalytic performance of the prepared electrode and eliminates the leach of Cr ion at the same time.

The development of low-cost, efficient, and stable water oxidation electrocatalyst is of great importance for hydrogen production. Herein, we report an approach to convert commercial stainless steel plate (SSP) into trimetallic Ni-Fe-Mn oxides/ hydroxides nanosheets (NiFeMnO x H y -SSP) as an oxygen evolution reaction (OER) electrode. The NiFeMnO x H y -SSP exhibits excellent OER performance with an overpotential of 232 mV at 10 mA cm geo À 2 , a Tafel slope of 37.6 mV dec À 1 , and long-term stability (100 h) in 1.0 M KOH aqueous solution. The electrochemical results reveal that the Mn plays a significant role in reducing overpotential and improving stability at 500 mA cm geo À 2 for OER. This work provides a facile way to fabricate OER electrodes by surface modification of SSP towards industrial water splitting.