Salt-templated synthesis of defect-rich MoN nanosheets for boosted hydrogen evolution reaction

Abstract

The ultra-stable highly efficient HER over a wide pH range on defect-rich MoN nanosheets synthesized using a modified salt-template process.

Salt‐Assisted Synthesis of 2D Materials

“…[ 9 ] Up to now, diverse 2D materials have been reported in addition to graphene: materials with layered structures such as transition metal dichalcogenides (TMDs, such as MoS 2 , WS 2 , MoSe 2 , and WSe 2 ), [ 10–13 ] transition metal oxides (TMOs, like δ‐MnO 2 , MoO 3 , and LaNb 2 O 7 ), [ 14–16 ] layered double hydroxides (LDHs, e.g., Mg 6 Al 2 (OH) 16 CO 3 ∙4H 2 O), [ 17 ] hexagonal‐boron nitride ( h ‐BN), [ 2,18 ] transition metal halides (such as MoCl 2 and CrCl 3 ), [ 19 ] black phosphorus, [ 20 ] graphitic carbon nitride ( g ‐C 3 N 4 ), [ 5 ] MXene (such as Ti 2 C and Ti 3 CN), [ 21–25 ] and clays (for instance, [(Mg 3 )(Si 2 O 5 ) 2 (OH) 2 ] and [(Al 2 )(Si 3 Al)O 10 (OH) 2 ]K). [ 19 ] Notably, many nonlayered structure species can also form 2D morphology with specific synthetic methods, largely expanding the 2D family (such as hexagonal‐MoO 3 ( h ‐MoO 3 ), hexagonal‐WO 3 ( h ‐WO 3 ), [ 15 ] transition metal nitrides (TMNs), [ 26,27 ] and transition metal phosphides (TMPs)). [28] To exploit the applications of 2D materials, the development of a synthetic method should be prioritized.…”

A low‐cost and efficient pathway for preparation of 2D MoN nanosheets via Na2CO3‐assisted nitridation of MoS2 with NH3

“…Furthermore, Figure F shows the high‐resolution HRTEM, FFT images and the corresponding arrangement of Mo and N atoms. The HRTEM and FFT images exhibited the high crystallinity of the prepared MoN nanosheets, and the interplanar spacing of (200) the facets was 2.48 Å, which is in the reported range of 2.44 to 2.50 Å . The arrangement of Mo and N atoms shows that the family of crystal planes of the lateral directions of the prepared MoN sheets should be (100).…”

“…3,8,15,18 Xiao et al reported a promising template-assisted method to synthesize 2D h-MoO3@NaCl. 19 Then, 2D MoN was successfully synthesized by ammoniating the 2D h-MoO 3 @NaCl, 3,8,9,12 which exhibited very high volumetric capacitance and excellent rate performance 3 , and efficiently photo-/electro-catalyzed | 7179 SUN et al the hydrogen evolution reaction. 8,9,12 Joshi et al 18 synthesized 2D MoN nanosheets by ammoniating 2D nanosheets of MoO 3 prepared via a hot-filament chemical vapor deposition (HFCVD) process.…”

“…19 Then, 2D MoN was successfully synthesized by ammoniating the 2D h-MoO 3 @NaCl, 3,8,9,12 which exhibited very high volumetric capacitance and excellent rate performance 3 , and efficiently photo-/electro-catalyzed | 7179 SUN et al the hydrogen evolution reaction. 8,9,12 Joshi et al 18 synthesized 2D MoN nanosheets by ammoniating 2D nanosheets of MoO 3 prepared via a hot-filament chemical vapor deposition (HFCVD) process. Urbankowski et al 15 reported the synthesis of 2D Mo 2 N via ammoniation and nitridation of 2D Mo 2 C at elevated temperatures, in which carbon in carbide MXenes were topochemically substituted by N, resulting in a nitride MXene with a similar structure.…”

Recent Achievements in Noble Metal Catalysts with Unique Nanostructures for Liquid Fuel Cells

“…Owing to their high surface area/volume ratio with sufficient exposed active sites and rapid charge transport, 2 D nanosheets (NSs) show better catalytic performance than other structures . In addition, if the thickness of ultrathin NSs is less than 5 nm, the catalytic performance will show further improvement because of the under‐coordinated surface sites.…”