Key Takeaways & Executive Findings
- •• • Achieved hydrogen evolution rate of 84.3 mmol g-1 h-1 and benzaldehyde evolution rate of 75.1 mmol g-1 h-1, representing a significant advancement over conventional heterojunction systems; this performance is critical for industrial-scale solar fuel production where high throughput is essential for economic viability. • • Demonstrated 94.8% selectivity for benzyl alcohol oxidation to benzaldehyde, minimizing overoxidation to CO2; this high selectivity is industrially crucial for producing high-value fine chemicals while maintaining high atom economy and reducing downstream separation costs. • • Engineered an atomically coherent interface with ultralow lattice mismatch of 2.5%, which suppresses structural defects and enhances charge transfer; this structural precision is vital for long-term operational stability and consistent performance in photocatalytic reactors. • • Validated the proton spillover pathway via kinetic isotope effect and in situ infrared spectroscopy, confirming that electrons and protons converge at cobalt sites; this mechanistic insight enables rational design of next-generation photocatalysts with optimized reaction kinetics.
Abstract
Photocatalytic hydrogen evolution fundamentally requires synchronized proton-coupled electron transfer. However, traditional multiphase architectures predominantly optimize spatial charge separation while systematically neglecting localized proton delivery, creating a severe kinetic bottleneck. Here, we engineer a highly coherent ZnCdS/ZnCo2S4 (ZnCdS/ZnCoS) heterojunction with an ultralow lattice mismatch of 2.5% to construct an efficient bioinspired catalytic cascade. This precise atomic registry establishes a three-fold synergistic effect: rapid hole extraction on ZnCdS drives highly selective (94.8%) benzyl alcohol (BA) oxidation, circumventing overoxidation; a robust internal electric field accelerates photogenerated electrons toward metallic ZnCoS domains; and a distinct thermodynamic gradient establishes a highly conductive solid-state conduit, propelling surface protons to migrate strictly along the coherent interface. Rigorous multidimensional validations, including kinetic isotope effect measurements and in situ infrared spectroscopy, demonstrate directed proton spillover culminating at cobalt coordination sites. Consequently, this spatiotemporal colocalization addresses the kinetic mismatch, achieving unprecedented hydrogen and benzaldehyde (BAD) evolution rates of 84.3 and 75.1 mmol g-1 h-1, respectively. This work establishes coherent interface engineering as a universal paradigm for synchronizing electron routing and proton spillover in advanced energy catalysis.
1. Introduction
Photocatalytic hydrogen production via solar energy is a promising route to address global energy demands, yet commercial viability is hampered by sluggish surface kinetics and severe charge recombination. Conventional heterojunction designs—Type-I, Type-II, Z-scheme, and S-scheme—have focused on spatial charge separation but often suffer from substantial lattice mismatches, which introduce interfacial defects that trap charge carriers and impede proton transport. This creates a fundamental kinetic bottleneck: the hydrogen evolution reaction requires simultaneous delivery of electrons and protons to the catalytic site, and any mismatch in their arrival times or locations increases the thermodynamic barrier and reduces overall efficiency.
Our work directly tackles this bottleneck by engineering an atomically coherent ZnCdS/ZnCoS heterointerface with an ultralow lattice mismatch of 2.5%. This precise atomic registry not only minimizes interfacial defects but also generates a robust internal electric field that drives efficient electron extraction to metallic ZnCoS domains, while a thermodynamic gradient guides proton migration along the coherent boundary. The result is a synchronized proton-coupled electron transfer pathway that achieves record-high hydrogen and benzaldehyde evolution rates, demonstrating that coherent interface engineering is a universal strategy to overcome the kinetic limitations of traditional photocatalysts.
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Research Group (2026). Coherent Heterointerface Engineering for Synchronized Proton-Coupled Electron Transfer in Photocatalytic Hydrogen Evolution. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-026-4396-0
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Frequently Asked Questions
What is the long-term stability of the ZnCdS/ZnCoS heterojunction under continuous photocatalytic operation?
The paper does not explicitly report long-term stability data beyond the initial performance metrics. However, the ultralow lattice mismatch (2.5%) suggests reduced interfacial defects, which typically enhances structural stability. For industrial application, extended cycling tests (e.g., >100 hours) are necessary to confirm resistance to photocorrosion and mechanical degradation.
How does the 2.5% lattice mismatch compare to conventional heterojunctions, and what is the impact on charge transfer efficiency?
Conventional heterojunctions often exhibit lattice mismatches exceeding 5%, leading to interfacial strain and defect states that act as recombination centers. The 2.5% mismatch in our system is exceptionally low, enabling a nearly defect-free interface. This facilitates efficient electron transfer, as evidenced by the high hydrogen evolution rate of 84.3 mmol g-1 h-1, which is significantly higher than typical values (often <10 mmol g-1 h-1) for similar systems.
What is the cost-effectiveness of the ZnCdS/ZnCoS photocatalyst compared to noble-metal-based systems?
ZnCdS and ZnCoS are composed of earth-abundant elements (Zn, Cd, S, Co), which are significantly cheaper than noble metals like Pt or Au commonly used as co-catalysts. The synthesis likely involves simple solvothermal or hydrothermal methods, which are scalable. While exact cost data are not provided, the use of non-precious metals and high reaction rates (84.3 mmol g-1 h-1) suggest a favorable cost-performance ratio for industrial scale-up.
Can the coherent interface engineering strategy be applied to other semiconductor systems for different photocatalytic reactions?
Yes, the principle of minimizing lattice mismatch to create coherent interfaces is generalizable. By selecting semiconductor pairs with similar crystal structures and lattice parameters, one can achieve atomic registry and enhanced charge/proton transfer. This strategy could be extended to other reactions such as CO2 reduction, nitrogen fixation, or organic synthesis, provided the band alignment and surface chemistry are appropriately tuned.
What are the specific roles of cobalt sites in the proton spillover and hydrogen evolution mechanism?
Cobalt coordination sites on ZnCoS act as the catalytic hubs where protons and electrons converge. In situ infrared spectroscopy and kinetic isotope effect measurements confirmed that protons migrate along the coherent interface and are reduced at cobalt sites. The metallic nature of ZnCoS facilitates electron accumulation, while the cobalt centers provide active sites for hydrogen atom adsorption and recombination, leading to efficient H2 evolution.
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