Construction of hierarchical NiFe-LDH/FeCoS2/CFC composites as efficient bifunctional electrocatalysts for hydrogen and oxygen evolution reaction

Nickel Iron Phosphide/Phosphate as an Oxygen Bifunctional Electrocatalyst for High-Power-Density Rechargeable Zn–Air Batteries

“…The microstructural attributes of the designed NiFeP/Pi catalysts were analyzed by XRD, which showed the existence of NiFe-LDH along with the diffraction peaks corresponding to NiPO 4 (ICSD ID-74049) and NiFeP (ICSD ID-98-063-293) in all the variants (Figure S2, SI). Furthermore, the XRD pattern of the as-synthesized NiFe-LDH are in agreement with that of reported NiFe layered double hydroxide (ICSD ID 00-049-0188). , …”

“…Furthermore, the XRD pattern of the as-synthesized NiFe-LDH are in agreement with that of reported NiFe layered double hydroxide (ICSD ID 00-049-0188). 51,52 Herein, layer double hydroxides with controllable layered structure having more efficient exposure of catalytic active sites help in promoting mass transportation through facilitating the electrolyte diffusion. 53,54 The strong electrostatic interactions between layers and interlayer anions lead to an ordered arrangement of interlayer species, which increases the structural stability.…”

Interface modifications for RuO2-decorated MoS2nanosheets as excellent electrocatalysts for alkaline hydrogen evolution reactions

“…3(a)) spectrum of MoS 2 is assigned to two strong peaks at 162.3 and 163.5 eV, consistent with S 2p 3/2 and S 2p 1/2 , respectively. 38 Differently, the peaks of Mo 3d and S 2p of the RuO 2 /MoS 2 catalyst both shift positively with a new peak at 235.2 eV assigned to Mo 6+ and a new signal at 168.4 eV attributed to SO 4 , 2–40 which suggests that electrons transfer from MoS 2 to RuO 2 nanoparticles, resulting from the intense electronic coupling effect generated from interface modifications. Furthermore, in the Ru 3d spectrum of the RuO 2 /MoS 2 catalyst (Fig.…”

“…Recently, the method of combining hydrolytic promoters with MoS 2 to construct heterojunctions via interface engineering has proved to be a promising strategy to improve the overall performance of the catalyst toward alkaline HER owing to optimized local electronic structures at the heterojunction interface, 14 more exposed active sites, 15 and contribution of additional hydrolysis promoters to improved kinetics of slow hydrolysis. 16–18 However, the poor conductivity of many water dissociation reaction promoters limits the maximum potential of this strategy. 19,20 Ruthenium oxide (RuO 2 ), as one of the candidates, possesses excellent conductivity 21 and certain HER activities according to the previous reports.…”

Chromium-Modified Ultrathin CoFe LDH as High-Efficiency Electrode for Hydrogen Evolution Reaction

“…As shown in Figure 4 a, the prepared electrode revealed excellent performance towards HER (201 mV overpotential at 10 mA cm −2 , 265 mV overpotential at 50 mA cm −2 ) as compared with CoFe LDH electrode ( Figure 4 a,b). Although there is still room for improvement compared with Pt/C (39 mV overpotential at the current density 10 mA cm −2 ), our catalysts showed a better advantage when compared with related non-precious metals, such as NiFe-LDH/FeCoS 2 /CFC (380 mV at 10 mA cm −2 ), Ni 1−x Fe x − LDH (242 mV at 10 mA cm −2 ), CoFe LDH − F (255 mV at 10 mA cm −2 ) and CoMoV LDH/NF (270 mV at 10 mA cm −2 ), as listed in Table S2 (see comparison details) [ 23 , 24 , 25 , 26 ].…”