Rapid surface reconstruction strategies for oxygen evolution reactions: chemical grafting of MXene quantum dots on Ni–Co layered double hydroxides

Abstract

The surface reconstruction of transition metal-based catalysts with its specific catalytic mechanism is currently one of the hotspots and difficulties in the electrocatalytic oxygen evolution reaction (OER). Herein, a chemical...

Introducing carbon dots to NiFe LDH via a mild coprecipitation–aging method to construct a heterojunction for effective oxygen evolution

“…Although the overpotential of NiFe LDH@CDs-200 may not be as good as the other Ni-based LDH catalysts, its Tafel slope was quite small (Table S2 †). 33,[41][42][43][44][45][46][47][48][49][50] A lower Tafel slope means that the overpotential does not increase rapidly with the current density, which indicated that NiFe LDH@CDs-200 was comparable to other catalysts at high current density. It is supposed that the CDs work like a 'electron transportation bridge' to suppress the recombination of photogenerated electron-hole pairs, reflected in the lower overpotential and Tafel slope.…”

Recent developments of MXene-based catalysts for hydrogen production by water splitting

“…In addition, another study speculated that in an alkaline environment, MXene-based materials may also have unconventional bifunctional mechanism (BM) in addition to the above-mentioned AEM and LOM, involving the production of *OO and *H, but this has not been confirmed and needs to be further studied. 55…”

“…In addition, another study speculated that in an alkaline environment, MXene-based materials may also have unconventional bifunctional mechanism (BM) in addition to the above-mentioned AEM and LOM, involving the production of *OO and *H, but this has not been confirmed and needs to be further studied. 55 At present, many types of catalytic mechanisms have been proposed for the acidic OER, as shown in Table 1, where * represents the active sites on the catalyst surface, where the reaction mechanisms of different catalysts may be different. Among them, the most commonly recognized OER catalytic mechanisms are the electrochemical oxidation pathway and oxidation pathway.…”

A NiCo2S4 octahedral configuration doped by Mn, Zn and Cu for the oxygen evolution reaction

“…Many effective strategies have been carried out to enhance catalytic performance, such as dopant insertion, 5,6 defect 7,8 and heterojunction construction, 9–11 and surface interface regulation. 12,13…”