Layered MAX phase electrocatalyst activity is driven by only a few hot spots

Abstract

The microscopic analysis of the MAX phase microparticles shows that the electrochemical activity of the microparticles is driven by a few particles with an outstanding catalytic activity towards hydrogen evolution.

Composite MAX phase/MXene/Ni electrodes with a porous 3D structure for hydrogen evolution and energy storage application

“…7A and B) consisting predominantly of Mo 2 TiAlC 2 , Mo 2 Ti 2 AlC 3 MAX phases, Mo 3 Al 8 , Al 4 C 3 and TiC phases is notably higher than that of the electrode based on the Ti 3 AlC 2 MAX phase. 37 This is consistent with the literature data 12,71 where the Mo 2 TiAlC 2 MAX phase was highlighted as the most active HER catalyst among other MAX phases. According to, 58 the Mo electrode stability decreases under neutral and basic conditions due to the formation of soluble surface species, but the dissolution rate is very low at −0.6 V vs. Ag/AgCl.…”

The unexpected photoelectrochemical activity of MAX phases: the role of oxide impurities

“…Recent studies have taken one step back, looking into the fundamental electrochemical properties of MAX phases and the possible application of these compounds as (photo)electrocatalysts for energy conversion. 22,31,32 In previous studies, 33,34 MAX showed better catalytic performances when exposed to different light sources. Ta 2 AlC, Cr 2 AlC, Ti 2 AlC and Ti 3 AlC 2 demonstrated improved photoelectrocatalytic H 2 production when illuminated by a 660 nm light source.…”

“…Recent studies have taken one step back, looking into the fundamental electrochemical properties of MAX phases and the possible application of these compounds as (photo)electrocatalysts for energy conversion. 22,31,32…”

High performance multi-purpose nanostructured thin films by inkjet printing: Au micro-electrodes and SERS substrates

“…58 These are junctions in between Au nanoparticles in which local elds may accumulate, and the molecules are less favoured to diffuse toward the bulk solution. 59,60 Consequently, the MBA molecules, lying on hot-spots, may guarantee a stable SERS signal. It is also reported that self-assembled monolayers (SAMs) of MBA on Au(111) facets foresee a tilted MBA orientation with respect to the Au surface.…”