Volcano relationships and a new activity descriptor of 2D transition metal–Fe layered double hydroxides for efficient oxygen evolution reaction

Abstract

Iron (Fe) sites played a critical role in boosting the catalytic activity of transition metal layered double hydroxides (LDHs) electrocatalysts for oxygen evolution reaction (OER), but the contribution of Fe...

Boosting Oxygen Evolution Performance of Nickel–Iron Layered Double Hydroxides by Controlling Oxygen Vacancies and Structural Disorder via n-Butyllithium Treatment

“…Overall, the n -BuLi treatment successfully introduced O vacancy defects and imparted an amorphous structure to the NiFe-LDH catalysts. As shown in the FT-IR spectrum (Figure S3c), no obvious difference appeared in the C–H peak near 2900 cm –1 between NiFe-LDH and treated NiFe-LDH, indicating that few n -butyl groups remained in the treated NiFe-LDH. , …”

“…As shown in the FT-IR spectrum (Figure S3c), no obvious difference appeared in the C−H peak near 2900 cm −1 between NiFe-LDH and treated NiFe-LDH, indicating that few n-butyl groups remained in the treated NiFe-LDH. 28,32 The overpotential, Tafel slope, and durability were tested to evaluate the OER properties; the results are shown in Figure 3. The electrocatalysts were tested by using a three-electrode system in the 1 M KOH solution.…”

Iron-doped cobalt phosphide nanowires prepared via one-step solvothermal phosphidization of metal–organic frameworks for the oxygen evolution reactions

“…The high OER activity is correlated to the early formation of the low-frequency peaks or the lower potential required for the peaks in the low and intermediate regions. 60 The maximum phase angles of Co MOF/NF, Co 2 P/NF and CoFeP/NF with respect to the applied potential are shown in Fig. 8d.…”

Electronic Asymmetry Engineering of Fe–N–C Electrocatalyst via Adjacent Carbon Vacancy for Boosting Oxygen Reduction Reaction

“…The results in Figure S13 (Supporting Information) showed that the I D / I G values of Fe–N–C‐ x gradually increased with the content of etching reagent, indicating the increased etching effect and more defects in Fe–N–C‐ x . In our previous study, [ 41 ] we have demonstrated that only a proper defect concentration can lead to the optimal adsorption of intermediates and thus the best catalytic performance, so that the Fe–N–C‐2 sample with appropriate defect concentration could exhibit the best ORR performance. For the purpose of examining the surface chemical states of the produced catalysts, X‐ray photoelectron spectroscopy (XPS) was employed (Figure S14, Supporting Information) and the obtained element contents were listed in Table S2 (Supporting Information).…”