A simple preparation of Co_0.75Fe_0.25hydrous oxide nanoparticles as active electrocatalysts for water oxidation reaction

Heterostructure iron selenide/cobalt phosphide films grown on nickel foam for oxygen evolution

“…This indicates decreased electron density at the Co 3+ sites induced by the electron interaction. This is consistent with the substitution of Fe at the Co site in Fe 1-z Co z O x H y observed by Wang et al 48 Electrodeposited Fe and Se layers shi the potential of the Co 3+ /Co 4+ peak as well. FeSe/ NF does not show the oxidation peak in the potential region.…”

“…3c shows the results of the short-term 10 mA cm −2 galvanostatic test, and the potential for all electrodes is stable during the 500 s. The lowest overpotential (235 mV) is observed for FeSe/Co 2 P/NF, which indicates that FeSe/Co 2 P/NF has the best OER activity. The turnover-frequency (TOF) values at 1.53 V are estimated based on eqn (6) by assuming that Co is regarded as the active site for the OER 48–50 TOF = I /(4 Fn )where F is the Faraday constant, and are summarized in Table 2. The TOF of FeSe/Co 2 P/NF reaches a maximum value of 0.024 s −1 , which is three times that of Co 2 P/NF (0.008 s −1 ).…”

“…29,64 The reported E a values for cobalt sulfides are in the range of 27.9–36.3 kJ mol −1 , 65 and for cobalt oxides and hydroxides E a values are within 49.0–64.4 kJ mol −1 . 48,66 The E a for cobalt phosphide is lower, indicating more facile kinetics towards the OER.…”

“…Summary of the electrochemical parameters of these electrodesThis journal is © The Royal Society of Chemistry 2023 at 1.53 V are estimated based on eqn (6) by assuming that Co is regarded as the active site for the OER[48][49][50] …”

Bifunctional Co0.75Fe0.25@C nanocomposite towards zero waste approach: Organic pollutants removal and OER electrocatalysis

“…30 Chao et al reported that Co0.75Fe0.25 hydrous oxide based catalyst showed an overpotential of 284 mV in 1 M KOH at 10 mA cm −2 . 31 To overcome the above-mentioned secondary waste management and energy challenges, we have designed an approach toward zero-waste scheme to utilize the secondary waste generated from organic dye remediation for oxygen evolution electrocatalyst. Herein we report the synthesis of cobalt-iron alloy impregnated partially graphitized layered carbon derived via carbonization method from cobalt-iron ions pre-treated bagasse.…”