Prof. YANG Hua Gui | Publications & Academic Profile | SinoGreenTech

Research Publications & English Decoded Briefs

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3610-7

Dual-confinement of reconstructed covalent organic framework for enhanced CO2 electrolysis in acid

Electrochemical CO2 reduction reaction (CO2RR) offers an attractive route to produce value-added multicarbon (C2+) products, yet suffers from competing hydrogen evolution and monocarbon production. Here, we propose a dual-confinement effect on CO2 reactant and *CO intermediate, induced by tuning the pore configuration of reconstructed covalent organic frameworks (RC-COFs). The highly crystalline microporous RC-COF-1, when coated on a Cu electrode, enhances local CO2 concentration and restricts CO diffusion, thereby promoting C-C coupling. In acidic electrolyte, the RC-COF-1@Cu electrode achieves a maximum C2+ Faradaic efficiency (FE) of 67.0% at 500 mA cm−2, while maintaining a total carbon product FE above 90% across a broad current density range (100–500 mA cm−2). Experimental and theoretical analyses confirm that the ordered micropores of RC-COF-1 modulate reactant adsorption and intermediate diffusion, leading to improved C2+ selectivity. This work underscores the critical role of COF pore architecture in microenvironment engineering for heterogeneous catalysis.

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3892-2

Atomically dispersed Pt species anchored on Al3+-doped SrTiO3 for photocatalytic overall water splitting

Single-atom co-catalysts on semiconductor substrates offer a cost-efficient route to enhance photocatalytic performance with minimal precious metal loading. However, precise tuning of local coordination environments and construction of efficient single-atom co-catalysts remain challenging for overall water splitting. Here, we employ an icing-assisted photochemical reduction strategy to anchor atomically dispersed Pt species as hydrogen evolution co-catalysts on Al3+-doped SrTiO3 (Pt SA-STO). The optimized Pt SA-STO exhibits remarkable activity, with hydrogen and oxygen evolution rates of 13.62 and 6.71 mmol h−1 g−1, respectively, and a turnover frequency (TOF) of 2114.5 h−1. We pioneer the use of nuclear magnetic resonance (NMR) spectroscopy to quantitatively track the temporal evolution of Pt4+ to Pt2+ under continuous irradiation during the icing-assisted photoreduction. Advanced characterizations and theoretical calculations confirm that single-atom Pt co-catalysts facilitate directional transfer and extraction of photogenerated charge carriers, effectively suppressing surface recombination. This work provides insights into designing novel single-atom co-catalysts by deepening understanding of electronic configurations and active sites in photocatalytic overall water splitting.

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SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3550-4

Deuterated FAPbI3 Perovskite Films with Suppressed Deprotonation for Durable Solar Cells

Hybrid perovskite solar cells (PSCs) have reached a certified power conversion efficiency (PCE) of 27.0%, yet their operational lifetime remains constrained by the intrinsic instability of organic cations, particularly the deprotonation of formamidinium (FA). This study introduces a molecular deuteration strategy to stabilize FAPbI3 by substituting the active hydrogen in the N–H bond with deuterium. The reduced ground-state energy of the N–D bond induces a kinetic isotope effect, lowering the deprotonation rate constant from 5.15 × 10−8 to 2.42 × 10−8 s−1. Solar cells fabricated with deuterated FAPbI3 films achieve a PCE of 25.08% and retain 97% of their initial efficiency (T97) for 1264 h under continuous one-sun illumination at 55 °C. This approach addresses the fundamental deprotonation pathway that limits the longevity of FA-based perovskites, offering a viable route to intrinsically stable photovoltaic devices without relying solely on extrinsic barrier layers or passivators.

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