Synergistic enhancement of the oxygen evolution reaction by MoS_x and sulphate on amorphous polymetallic oxide nanosheets

Abstract

To alleviate the energy crisis and achieve the transformation of renewable energy sources, developing low-cost, highly efficient and stable oxygen evolution reaction (OER) electrocatalysts for water splitting has aroused great...

Effect of Surface‐Adsorbed and Intercalated (Oxy)anions on the Oxygen Evolution Reaction

“…Their report includes DFT simulations assuming a common OER reaction pathway (H 2 O→*OH→*O→*OOH→O 2 ), indicating that the sulfate stabilizes the *OOH intermediate with respect to the *OH one (see Figure 2 for the stabilizing interaction on NiFeOOH) [16] . The possibility of this stabilization was later confirmed by other reports [16, 17, 19, 39] . This is of particular importance, as a universal scaling relation between these two intermediates had been identified with an energy difference larger than ideal [20] .…”

“…[16] The possibility of this stabilization was later confirmed by other reports. [16,17,19,39] This is of particular importance, as a universal scaling relation between these two intermediates had been identified with an energy difference larger than ideal. [20] In this regard, for many catalytic systems, a stabilization of the *OOH intermediate leads to improved OER kinetics, [43] and is highly desired but extremely challenging, as changing the electronic properties of a flat catalyst will lead to a similar stabilization or destabilization of the *OH and *OOH intermediates.…”

“…[11][12][13] In 2020, an additional function of the anions besides being sacrificial reagent was reported, which is the surfaceadsorption of the thermodynamically stable, fully oxidized oxyanions. [14,15] In subsequent reports, it was shown that these adsorbed species can stabilize the OER reaction intermediates (see Section 3 for a detailed discussion), [14][15][16][17][18][19] and that they can enhance the activity of the most promising OER catalysts, such as nickel-iron oxyhydroxides. [16] Furthermore, this phenomenon adds a new, unexplored dimension into the OER catalyst parameter space that could finally break the persisting *OH/*OOH scaling relations.…”

Assembling and Regulating of Transition Metal‐Based Heterophase Vanadates as Efficient Oxygen Evolution Catalysts

“…j) Comparison of the OER overpotential and Tafel slope with reported results. [23,29,34,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] overpotential at a current density of 10 mA cm −2 (Figure 4j; Table S3, Supporting Information). [23,29,34,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] Based on the above studies, we suggest that the engineered NiFe-VO x -0.5 catalyst with heterophase shows promising potential to serve as an efficient OER electrocatalyst for water splitting.…”

“…g) The calculated TOF values, h) mass activity of as-synthesized catalysts and RuO 2 .i) Chronopotentiometric curves of NiFe-VO x -0.5 and RuO 2 at constant current densities of 10 mA cm −2 . j) Comparison of the OER overpotential and Tafel slope with reported results [23,29,34,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57].…”