02060nas a2200193   4500008004100000022001400041245013600055210006900191260000800260490000700268520132600275653002501601653002401626653003301650100001801683700002101701700001901722856012501741       2025                        eng d  a1434-194800aAn in-depth study of the Fe-Se system at the nanoscale reveals remarkable results on the electrocatalytic oxygen evolution reaction0 aindepth study of the FeSe system at the nanoscale reveals remark  cMAR0 v283 a<p>
	A catalyst for an electrocatalytic oxygen evolution reaction (OER) is a key component of the large-scale storage of renewable energy through the conversion of water into oxygen and hydrogen. Iron-based selenide materials are currently being considered as potential options for electrocatalytic oxygen evolution reaction (OER) because of their, widespread availability, low cost, and outstanding performance. In this study, we employed a thermal decomposition method to synthesize all stable phases of the Fe-Se system, including Fe7Se8, Fe3Se4, FeSe2, and FeSe. Additionally, we slurry-coated these phases onto a three-dimensional (3D) nickel foam substrate. The prepared 3D electrodes of Fe7Se8, Fe3Se4, FeSe2, and FeSe exhibit remarkably low overpotentials of 270, 276, 299, and 289 mV at a current density of 50 mA/cm2 for OER. In addition, the catalytic activity for OER is also tested on glassy carbon electrodes to compare its performance with the Ni-foam 3D substrate. The Fe7Se8 phase in the Fe-Se system exhibits the highest catalytic activity towards OER on both substrates due to variations in the Fe2+/Fe3+ ratio and the presence of Fe vacancies (cation vacancies) within the crystal lattice. Moreover, a faradaic efficiency of 98 % was exhibited by Fe7Se8 for the oxygen evolution reaction (OER).</p>
10aIron selenide system10aOER electrocatalyst10aThermal decomposition method1 aSingh, Dinesh1 aGhalawat, Monika1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/depth-study-fe-se-system-nanoscale-reveals-remarkable-results-electrocatalytic-oxygen