Hierarchical tandem nanocage double Z-scheme design
Use ultrathin GDY nanosheets as bridges between light-harvesting semiconductors in cascaded nanocage structures.
Claimed effects: GDY serves as an electron bridge between semiconductors and supports high hydrogen-evolution activity.
Controlling variables: liquid-liquid interface GDY nanosheets · calcination-derived nanocages · multi-level cascade structure
Representative materials: CuCo2O4/GDY/Cu2O
Caveat: The review reports this as one example under other semiconductors rather than as a full nanocage design taxonomy.
7 · 3.5. Other types of semiconductors based on graphdiyne · Fig. 7A
CuI-GD hybrid anchoring on titanium perovskite nanorods
Embed CuI into layered graphdiyne and anchor the hybrid on NiTiO3 to build a ternary S-scheme system.
Claimed effects: The thin GD layer acts as an electron acceptor, while CuI-GD improves system redox ability and hydrogen evolution.
Controlling variables: CuI embedding into layered GD · physical anchoring on NiTiO3 · distribution of CuI-GD on nanorods
Representative materials: NiTiO3/CuI-GD
Caveat: Review reports performance but does not independently resolve the primary charge-transfer mechanism.
4 · 3.1. Titanium based photocatalyst based on graphdiyne
Deprotection-free in-situ GDY growth on C3N4
Grow graphdiyne on C3N4 by a non-deprotection approach to create a complete GDY@C3N4 heterojunction.
Claimed effects: GDY loading enhances light-radiation capture and improves hydrogen evolution relative to pure C3N4.
Controlling variables: surface growth on C3N4 · GDY loading · heterojunction completeness
Representative materials: GDY@C3N4
Caveat: The review gives only a concise performance comparison; detailed mechanism should be checked in the original paper.
7 · 3.5. Other types of semiconductors based on graphdiyne · Fig. 7B
S-scheme gamma-graphyne/CuMoO4 composite assembly
Mechanically prepare a gamma-GY carbon material and couple it with CuMoO4 to form a binary S-scheme composite.
Claimed effects: Large-pore gamma-GY provides loading positions and receives photogenerated electrons from CuMoO4 under illumination.
Controlling variables: pore shape of gamma-GY · CuMoO4 particle loading · interfacial electron-transfer pathway
Representative materials: gamma-GY/CuMoO4
Caveat: Mechanism is inferred from in-situ XPS peak shifts as summarised by the review.
5 · 3.2. Metal oxide photocatalyst based on graphdiyne · Fig. 4
Band-gap tuning by hydrogen substitution
Replace or substitute GDY with hydrogenated positions to widen the band gap and improve CB/VB alignment with TiO2.
Claimed effects: Wider band gap and more favourable interfacial carrier separation; caveat that limited conjugation can reduce mobility.
Controlling variables: degree and position of H substitution · retention of pi-conjugated structure · band-edge alignment with partner semiconductor
Representative materials: H-GDY · H-GDY/TiO2
Caveat: The review states that increased gap and limited conjugation affect carrier mobility, so band tuning is not cost-free.
2 · 2.1. Adjustable band structure · Fig. 2
LDH morphology control in double S-scheme heterojunctions
Construct GDY-CuI binary units and combine them with NiCoLDH morphologies to form double S-scheme heterojunctions.
Claimed effects: Nanorod LDH morphology is described as more stable and provides more active sites than nanoflowers, enhancing electron transport and redox ability.
Controlling variables: LDH morphology · anchor-point density · GDY-CuI contact interface
Representative materials: NiCoLDH/CuI/GDY · NiCoLDH-R · NiCoLDH-F
Caveat: The review reports morphology comparison at a high level without reproducing a full synthesis-structure matrix.
5 · 3.3. Hydrotalcite based photocatalysts based on graphdiyne · Fig. 5
CuI-GDY immobilisation on MOFs with work-function-driven fields
Fix CuI-GDY on Ni-MOF to reduce GDY aggregation and exploit Fermi-level differences that establish a built-in electric field.
Claimed effects: GDY acts as an electron-rich polymer layer with capture and conduction capability; built-in fields improve separation of photogenerated electrons and holes.
Controlling variables: CuI-GDY loading · MOF porosity · work-function differences · GDY aggregation
Representative materials: CuI-GDY/Ni-MOF · CGN-20
Caveat: Work-function values are review-reported from the cited DFT/experimental study and should not be treated as newly calculated here.
6 · 3.4. Metal organic skeleton photocatalysts based on graphdiyne · Fig. 6
GDY wrapping on PBA-derived hollow nanocages
Prepare GDY and introduce it onto hollow NiCo2O4 nanocages derived from Prussian blue analogue templates.
Claimed effects: p-n heterojunction construction separates carriers; hollow structures enhance light utilisation and potential intracavity reactions.
Controlling variables: PBA-derived hollow structure · GDY wrapping · crystalline/amorphous interface
Representative materials: GDY/NiCo2O4 nanocages
Caveat: The review's PBA discussion is selective and not a general PBA photocatalyst survey.
6 · 3.4. Metal organic skeleton photocatalysts based on graphdiyne
Strong chemical-bond coupling at S-scheme interfaces
Use in-situ high-temperature calcination to form Co-C bonds between organic GDY and inorganic CoTiO3.
Claimed effects: Co-C bonding is interpreted as a high-speed electron-transfer bridge that reduces recombination and improves hydrogen evolution.
Controlling variables: calcination conditions · formation of Co-C interfacial bonds · GDY/CoTiO3 composition
Representative materials: 20%-GCTO · CoTiO3/GDY
Caveat: Secondary review interpretation relies on XPS shifts and photoluminescence evidence reported in the primary study.
4 · 3.1. Titanium based photocatalyst based on graphdiyne · Fig. 3
0D/2D quantum-dot-on-GDY heterojunction construction
Couple Co3O4 or oxide quantum dots with two-dimensional porous GDY to form p-n or Z-scheme heterojunctions.
Claimed effects: Porous GDY anchors quantum dots, limits aggregation, exposes active sites and promotes charge separation.
Controlling variables: quantum-dot dispersion · GDY porous surface · electrostatic self-assembly
Representative materials: Co3O4/GDY · Co3O4 quantum dots/GDY
Caveat: The review groups different oxide/GDY architectures under a broad metal-oxide strategy, so primary papers remain necessary for detailed comparison.
4 · 3.2. Metal oxide photocatalyst based on graphdiyne