Effect of Fe doping on Co-S/carbon cloth as bifunctional electrocatalyst for enhanced water splitting

Co Ion‐, NiS2‐ and CNT‐Co‐Doped Nanoflower/Hollow Spherical NiO Nanocomposites for Efficient Electrocatalytic Oxidation of Methanol

“…In Figure 4c, the binding energy peaks of 780.5 eV and 794.5 eV are Co 2 + peaks, and the 778.4 eV and 796.2 eV peaks are belong to Co 3 + , [52] which indicates that a part of Co 2 + in the raw material is oxidized to Co 3 + , which may also be due to the electron transfer form Co ion to S element. [53] In Figure 4d, the peaks of 161.5 eV and 162.6 eV can be identified as S À 1 , which is is a little lower compared with the 161.8 eV and 162.9 eV peaks in the literature. [54,55] This is because S has a strong electron affinity.…”

Selenium-transition metal supported on a mixture of reduced graphene oxide and silica template for water splitting

“…The overpotential value at 10 mA cm −2 for different iron composite electrocatalyst e.g. FeSe 2 supported on CoSe using hydrothermal and selenization process is 183 mV, 29 Fe–Co–S/CC-37.5 and Fe–Co–S/CC-150 using hydrothermal process is 320 mV, 89 Fe–Mo supported on Te is 300 mV, 103 Fe(Se 0.5 S 0.5 ) 2 using hydrothermal process is 247 mV, 104 FeSe 2 using hydrothermal process is 330 mV, 105 FeP and FeCoNiP prepared by chemical reduction and phosphorization process are 325 and 200 mV, respectively, 106 Fe 0.5 Co 0.5 Se 2 supported on carbon fiber cloth prepared by solvo thermal and selenization process is 290 mV, 107 NiFeSe x supported on carbon fiber cloth prepared by electrodeposition followed by solvo thermal process is 310 mV. 108 Additional LSV and Tafel slope comparison of recently published non-noble metal-based for OER catalysts are shown in Table 1.…”

“… 88 To the best of our knowledge, CoSeO 3 /rGO-ST and FeSe 2 /rGO-ST catalyzing HER have been rarely reported in the literature. However, they both have a reasonable and comparable overpotential at 10 mA cm −2 , for example, Xueying Li et al 89 prepared different HER electrocatalysts composed of Fe–Co–S nanoflakes grew on the carbon cloth by hydrothermal method and annealing treatment, they found that at the current densities of 10 mA cm −2 , the overpotential of Co–S/CC, Fe–Co–S/CC-37.5, Fe–Co–S/CC-75, and Fe–Co–S/CC-150 is 330, 320, 260, and 320 mV respectively. Moreover, the Co–BTC (1,3,5-benzene tricarboxylic acid) electrocatalyst prepared by pulsed laser ablation in dimethyl formamide 90 showed an overpotential of 437 mV toward HER at a current density of 10 mA cm −2 in 1.0 M KOH.…”

Iron‐group Metal Compound Electrocatalysts for Efficient Hydrogen Production: Recent Advances and Future Prospects

“…Li et al have synthesized a series of FeÀ CoÀ S/CC self-support nanohybrids through a facile onepot method. [25] The hierarchical FeÀ CoÀ S/CC as a binder-free electrode with more active sites and enhanced electronic conductivity exhibits low overpotentials of 258 mV for the oxygen evolution reaction (OER) in an alkaline solution at a current density of 10 mA cm À 2 . Meanwhile, the Tafel slope is 61.20 mV dec À 1 and 82.60 mV dec À 1 , along with long-term stability for over 48 h. The metal doping reduced the electron-hole recombination rate and the steady-state pop-ulation of charge carriers accordingly increased.…”