Surface modification of g-C3N4 by hydrazine: Simple way for noble-metal free hydrogen evolution catalysts

Abstract

The graphitic carbon nitride (g-C 3 N 4 ) usually is thought to be an inert material and it's difficult to have the surface terminated NH 2 groups functionalized. By modifying the g-C 3 N 4 surface with hydrazine, the diazanyl group was successfully introduced onto the g-C 3 N 4 surface, which allows the introduction with many other function groups. Here we illustrated that by reaction of surface hydrazine group modified g-C 3 N 4 with CS 2 under basic condition, a water electrolysis active group C(=S)SNi can be implanted on the g-C 3 N 4 surface, and leads to a noble metal free hydrogen evolution catalyst. This catalyst has 40% hydrogen evolution efficiency compare to the 3 wt% Pt photo precipitated g-C 3 N 4 , with only less than 0.2 wt% nickel.

Effects of Protonation, Hydroxylamination, and Hydrazination of g-C3N4 on the Performance of Matrimid®/g-C3N4 Membranes

“…In relation to the ATR-FTIR spectra of MMMs doped with oxygen plasma and hydrazine treated g-C 3 N 4 , also depicted in Figure 3, it is worth noting that no bands associated with the N–OH or –NHNH 2 groups of g-C 3 N 4 (which would result from those treatments) were observed. This may be due to low dopant doses, and would be in agreement with the findings of Chen et al [35], who reported no remarkable differences between pristine g-C 3 N 4 and g-C 3 N 4 -NHNH 2 . On the other hand, the band at 1606 cm −1 , present in the pristine matrix, was found to disappear upon doping in both cases.…”

“…In the later approach, diazanyl group modified g-C 3 N 4 -NHNH 2 (Figure 1c) was obtained according to the procedure described by Chen et al [35]: 1 g of as-synthesized g-C 3 N 4 was mixed with 20 mL water and 4 mL hydrazine hydrate, followed by stirring at 80 °C for 40 min.…”

Facile in situ reductive synthesis of both nitrogen deficient and protonated g-C3N4 nanosheets for the synergistic enhancement of visible-light H2 evolution

“…As seen in Fig. 3C, the ve peaks at 2.2, 5.1, 8.7, 11.5 and 13.5 ppm in the 1 H NMR spectra were assigned to the protons in aliphatic groups, residual water, NH x groups, the hydrogen bonds in acid groups (such as carboxylic acid and phosphoric acid) and g-C 3 N 4 framework, [33][34][35] respectively. Thus, the intensication of the 8.7 or 11.5 ppm peak can be regarded as evidence for the protonation of g-C 3 N 4 nanosheets.…”

Highly Dispersed and Small‐Sized Nickel(II) Hydroxide Co‐Catalyst Prepared by Photodeposition for Hydrogen Production

“…[4,7] Most importantly,i th as ab and gap of % 2.7 eV suitable for photocatalytic hydrogen production. [8][9][10] However,t he pristine g-C 3 N 4 was affectedb yt he rapid recombination rate of photo-generated carriers (e À and h + ), which greatly impeded the photocatalytic performance. In order to furtheri mprove the photocatalytic activity of g-C 3 N 4 ,s ome research progress have been done, for example (i)microstructure modification; [11] (ii)forming ah eterojunction with other semiconductors; [12] (iii) copolymerization with organic monomers; [13] (iv) co-catalyst modification.…”