Variable-valence ion and heterointerface accelerated electron transfer kinetics of electrochemical water splitting

Abstract

Accelerating electron transfer kinetics is an efficient strategy to tackle sluggish oxygen evolution reaction (OER). Herein, Ni3Fe1-xVx/Ni3Fe1-xVxN heterojunctions were elaborately constructed to demonstrate that the coupling of variable-valence metal doping...

Heterointerface enhanced NiFe LDH/V–Co4N electrocatalysts for the oxygen evolution reaction

“…3d), the main peak at 397.1 eV corresponds to the N–M (M = Co and V) bond from the metal nitride, and another peak at 399.5 eV refers to the N–H bond from the remaining ammonia species. 14–16,42 Furthermore, the binding energy of the N–M bond in NiFe LDH/V–Co 4 N shows a positive shift compared to that in V–Co 4 N. This result indicates that N may be involved in interfacial interactions. These observations further clarify that a strong electron interaction occurs between V–Co 4 N and NiFe LDH, especially between Co and Fe species, which is consistent with that in previous literature.…”

“…[8][9][10][11][12] Recently, many researchers have employed a heteroatom-doping strategy to tune the electronic structure of Co 4 N for enhanced activity, especially doping with vanadium (V) that possesses multiple valence states. 13,14 When V is doped into Co 4 N species, the d-band center of Co 4 N can be tailored, which changes the adsorption energy between the intermediates and the active sites. [15][16][17][18] In addition, the construction of heterointerfaces is another efficient way to optimize the performance of electrocatalysts.…”

Porosification and Fe3+ Intercalation of Spent LiCoO2 as an Efficient Oxygen Evolution Electrocatalyst

“…Figure b compares the EIS of SLCO and Fe x h-SLCO. It can be seen that Fe 0.5 h-SLCO has the smallest charge transfer resistance ( R ct ), which indicates that Fe 0.5 h-SLCO has the fastest OER kinetic rate . The resistance during OER is greatly reduced due to the increased conductivity that accelerates the transfer of electrons from the catalyst to the carbon paper electrode surface.…”

Construction of Ru/FeCoP heterointerface to drive dual active site mechanism for efficient overall water splitting

“…3d and e, Table S2 and S3 † show that the as-prepared Ru@FeCoP, for both the OER or HER, exhibited the lowest Tafel slope and h 10 among the recently reported noble metal-based electrocatalysts. 3,5,8,15,26,27,30,33,45,[51][52][53][54][55][56][57][58][59][60][61][62] Similarly, the charge transfer speed was also evaluated and analyzed by the EIS diagram. Motivated by the doping of Fe atoms together with the generation of the Ru/FeCoP heterointerface, Ru@FeCoP possessed the smallest R ct value for the HER (0.587 U) and OER (0.88 U) among the assynthesized samples (Fig.…”

“…Therefore, it is necessary to develop HER and OER electrocatalysts with high activity. [3][4][5] The interface engineering strategy with the coupling effect and electronic effect is considered one of the most important methods for enriching the catalytic function and improving the intrinsic activity of materials. [6][7][8] Especially, the coupling of several active phases can greatly enrich the number and type of active centers and optimize the reaction paths for electrocatalysis.…”