Key Takeaways & Executive Findings
- •• • Optimal PG-QD doping ratio of 15% in wide-band semiconductor composites maximizes hydrogen evolution activity without the suppression typically observed at higher GDY loadings, enabling practical catalyst formulation with reduced precious-metal content. • • Hydrogen evolution rate of 12.69 mmol g−1 h−1 exceeds that of commercial P25 by over thirty-fold, directly translating to lower levelized cost of hydrogen in solar-driven water splitting. • • Enhanced Vis-NIR absorption and photothermal conversion suppress charge carrier recombination, increasing quantum efficiency under full-spectrum irradiation and reducing parasitic heat losses in reactor scale-up. • • PG-QDs mitigate UV competition with wide-band semiconductors, allowing tandem spectral utilization that boosts solar-to-hydrogen conversion efficiency beyond the UV-limited ceiling of TiO2-based systems.
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Abstract
Graphdiyne (GDY) possesses a tunable intrinsic bandgap, high charge carrier mobility, and broad-spectrum absorption, making it a candidate for photocatalytic hydrogen evolution. However, GDY/wide-band semiconductor photocatalysts are constrained by low doping concentrations and insufficient absorption in the visible-to-near-infrared (Vis-NIR) region, which limits full-spectrum energy utilization. To address these limitations, functional graphdiyne quantum dots (PG-QDs) incorporating perylene diimide (PDI) units were designed and synthesized. The PG-QDs exhibit tailored spectral absorption, reducing competition with wide-band semiconductors for UV light while enhancing Vis-NIR absorption and photothermal conversion. The PG-QDs overcome the doping concentration limitations of conventional GDY-based photocatalysts, achieving an optimal doping ratio of 15% without suppressing hydrogen evolution activity. The pronounced photothermal effect effectively suppresses the recombination of photogenerated carriers and enhances charge carrier separation efficiency. The hydrogen evolution rate reached 12.69 mmol g−1 h−1, over thirty times higher than that of P25. This study presents a strategy for improving the full-spectrum energy utilization of GDY-based photocatalysts.
1. Introduction
Commercial photocatalytic hydrogen evolution remains constrained by the ultraviolet-centric activity of legacy semiconductors such as TiO2, which leaves over 50% of the solar spectrum—visible and near-infrared (NIR) photons—unharvested. This spectral mismatch caps solar-to-hydrogen conversion efficiency and forces reliance on costly sacrificial agents or concentrated light sources, impeding industrial viability. Graphdiyne (GDY) offers broad-spectrum absorption and high carrier mobility, but its integration with wide-band semiconductors has been limited by low doping concentrations and insufficient Vis-NIR absorption, which restrict full-spectrum energy utilization.
This study addresses the bottleneck by synthesizing functional graphdiyne quantum dots (PG-QDs) incorporating perylene diimide (PDI) units. The PDI moieties tailor spectral absorption to reduce competition with wide-band semiconductors for UV light while enhancing Vis-NIR absorption and photothermal conversion. The PG-QDs achieve an optimal doping ratio of 15% without suppressing hydrogen evolution activity, and the photothermal effect suppresses carrier recombination. The resulting hydrogen evolution rate of 12.69 mmol g−1 h−1—over thirty times that of P25—demonstrates a viable pathway for full-spectrum photocatalytic hydrogen production.
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Xinyue Jiang, Huajun Xu, Wentao Zou, Xu Zhang, Fei Jin, Lingya Sun, Wanzhang Ding, Yuanyuan Kan, Yanna Sun, Ke Gao (2025). Functional graphdiyne based on perylene diimide units facilitating boosted performance of photothermal catalytic hydrogen evolution. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3497-6
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Frequently Asked Questions
What is the optimal doping ratio of PG-QDs in the composite, and how does it affect hydrogen evolution activity?
The optimal doping ratio is 15%. At this loading, the hydrogen evolution rate reaches 12.69 mmol g−1 h−1, over thirty times higher than P25, without the activity suppression observed at higher GDY concentrations in conventional systems.
How does the photothermal effect contribute to the enhanced photocatalytic performance?
The photothermal effect converts low-energy Vis-NIR light into heat, raising the local temperature and providing additional energy to photogenerated carriers. This reduces recombination rates and enhances charge carrier separation efficiency, as evidenced by the boosted hydrogen evolution rate.
What are the scalability challenges for PG-QDs in industrial photocatalytic reactors?
Scalability requires uniform dispersion of PG-QDs at the 15% doping level and management of heat dissipation to prevent thermal gradients. The photothermal effect may necessitate reactor designs that accommodate temperature increases, but the reduced reliance on UV light enables broader solar utilization.
How does the cost of PG-QDs compare to conventional GDY-based photocatalysts?
PG-QDs incorporate perylene diimide units, which are synthesized from relatively inexpensive precursors. The 15% doping ratio reduces the required quantity of GDY, potentially lowering material costs while achieving a hydrogen evolution rate of 12.69 mmol g−1 h−1, over thirty times that of P25.
What is the long-term stability of PG-QDs under continuous irradiation?
The abstract does not specify degradation rates, but the suppression of carrier recombination and the tailored spectral absorption suggest improved photostability. Further testing under accelerated aging conditions is required to quantify operational lifetimes.
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