Atomic bridging modulation of Ir–N, S co-doped MXene for accelerating hydrogen evolution

Abstract

Two-dimensional Ti3C2Tx MXenes have attracted significant interests as low-cost supports to anchor single atoms owing to their unique properties. Nevertheless, there is still lack systematic investigation on the coordinative interaction...

Recent advances in noble metal MXene-based catalysts for electrocatalysis

“…For example, Tan and colleagues anchored Ir atoms on heteroatom N, S co-doped Ti 3 C 2 T x . 127 The theoretical calculation results showed that the N and S co-doped Ti 3 C 2 T x support can capture electrons from the Ir single atom and redistribute the charge in the interface region of the Ti 3 C 2 T x support, and thus IrSA–2NS–Ti 3 C 2 T x exhibited significant HER catalytic activity in both acidic and alkaline solutions.…”

SACs on Non‐Carbon Substrates: Can They Outperform for Water Splitting?

“…[191] Metal carbides can also be easily modified by anion atoms due to their changeable surface chemical groups. [192][193][194] Tan et al reported the single Pt atoms supported by 3D porous N, P co-doped Ti 3 C 2 T x MXene (PNPM) nanosheets prepared by a gelation-and-pyrolysis method (Figure 11d-f). [192] Due to Pt atoms being coordinated with N(O) and P atoms, the valence state of Pt was higher than that of Pt nanoparticles loaded on PNPM (Figure 11g-i), which arose from the strong electronic interactions between Pt atoms and PNPM nanosheets.…”

“…The fitting FT-EXAFS spectrum of Pt L 3 -edge presented a Pt-N(O) coordination number of 3 and a Pt-P coordination number of 1.1 for Pt 1 /PNPM (Figure 11j), thus leading to Pt atom being of +1.82, thereby resulting in a comparable HER performance to Pt/C (20 wt%, Pt) in acidic and alkaline media at a low loading amount of 2.32 wt% Pt. Similarly, N and S dopants can also coordinate single metal atoms to tune electronic states leading to optimization of hydrogen adsorption, e.g., Ir 1 /N and S codoped Ti 3 C 2 T x , [193] Ru 1 /N and S co-doped Ti 3 C 2 T x , [194] Ru 1 /N doped Ti 3 C 2 T x . [195] These non-metallic atoms doped metal carbides-based SACs exhibit enhanced electrocatalytic activities, owing to their differences in electronegativity compared to C and O atoms.…”

Single atom supported on MXenes for the alkaline hydrogen evolution reaction: species, coordination environment, and action mechanism

“…11,12 Ti-based MXenes, especially Ti 3 C 2 , are the most commonly used MXenes, but their application in the field of HER is limited by excessive overpotential. 13,14 Fortunately, many studies have shown that Mo-based MXenes have great potential for application in the HER field. [15][16][17][18] Such as, the research of Zhi et al showed that Mo-based MXenes effectively avoided the toxic effect of the F-terminal group on the HER due to the weak Mo-F bond, so they had lower overpotential than Ti-based MXenes and showed better HER performance.…”