Graphdiyne@NiO_x(OH)_y heterostructure for efficient overall water splitting

Abstract

Graphdiyne (GDY), a rising star of two-dimensional (2D) carbon material consisting of unique sp-/sp2-cohybridized carbon atoms, has been demonstrated to be an ideal platform for developing efficient catalysts with high...

Rational Construction of Z‐Scheme Charge Transfer Based on 2D Graphdiyne (g‐CnH2n−2) Coupling with Amorphous Co3O4 Quantum Dots for Efficient Photocatalytic Hydrogen Generation

“…Moreover, the bands located at 1940.49 and 2197.67 belong to the vibrations of the diacetylene bond. [27] These results forcefully confirm that the strategy is feasible to replace copper foil with copper-based halogen compounds for the preparation of GDY (Figure 3).…”

“…[26] A neoteric heterostructure of GDY@NiO x (OH) y was reported by Li et al The unique structure provided the largest electrochemical catalytically active surface and the highest electrical conductivity, making the catalyst display preeminent electrocatalyst water splitting performance. [27] Lu and co-workers firstly introduced GDY into the field of photocatalytic hydrogen evolution, a CdS/ GDY heterojunction was constructed by simple in situ growth, the existence of GDY not only restrained the agglomeration of CdS NPs but also facilitated the separation and transfer for photoinduced charge carriers. [28] Nevertheless, the photocatalysts based on the GDY for photocatalytic hydrogen generation are still confined.…”

Crystal–amorphous NiO/MoO2 with a high-density interface for hydrogen evolution

“…According to the earlier report, NiO can facilitate the dissociation of water in an alkaline electrolyte to generate active hydrogen, while amorphous areas are the active centers for hydrogen adsorption and desorption, thus synergistically boosting the HER process. 10,11,27 It is worth mentioning that the lattice plane of MoO 3 cannot be well observed due to the multi-defect structure. Note that the low valence-state Mo species are deemed to be active for the HER, and can serve as catalytic sites for hydrogen adsorption.…”

“…Transition metal oxides are generally regarded as HER inactive materials due to unsuitable hydrogen adsorption energy and inert electron transport. [7][8][9] Particularly for nickel oxide (NiO), which is an ideal catalyst for water adsorption and dissociation in an alkaline medium, the calculated ΔG H* value is −0.27 eV or −0.55 eV, 10,11 which is too negative to easily desorb active hydrogen, while according to the Sabatier principle, better catalytic performance is based on moderate bonding to the active species. 12,13 Therefore, combining NiO with materials with better hydrogen desorption capability to generate efficient catalytic sites for fast hydrogen adsorption/ desorption is necessary.…”

Graphdiyne Electrochemistry: Progress and Perspectives

“…This was explained by the fact that the GDY effectively controlled the coordination environment and valence state of metal atoms in QDs, leading to in situ nucleation, anchoring or growth of uniform and controllable QDs on the GDY materials. [ 181 ] This IrO x ‐QD/GDY material with highly dispersed IrO x QDs thus improved its charge transfer and maximized the number of its active sites. Meanwhile, the GDY material was combined with NiO x (OH) y to form a heterostructure for the OWS in that the strong interaction between GDY and NiO x (OH) y greatly enhanced charge transfer.…”