Prof. ZHENG Xuerong | Publications & Academic Profile | SinoGreenTech

Research Publications & English Decoded Briefs

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3637-6

Hafnium Oxide-Based Ferroelectric Reconfigurable Optoelectronic Logic Gate Arrays for Optical Communication Encryption

Traditional optical fiber communication encryption methods lack sufficient dynamic adaptability and hardware flexibility, while reconfigurable logic gates can overcome this limitation, thereby significantly improving the flexibility of encryption systems. This study reports a reconfigurable optoelectronic logic gate (OELG) system based on hafnium-zirconium oxide (HZO) ferroelectric thin films. Through ultra-low temperature atomic layer deposition technique, the fabricated HZO thin films demonstrate an exceptional pyroelectric coefficient of 1835.91 μC m−2 K−1 and robust multi-level polarization stability, enabling efficient broadband photon-to-current conversion. By leveraging the pyroelectric effect and tunable polarization states, the OELG device achieves dynamic optical signal modulation and logic processing. The OELG device supports five fundamental logic operations (AND, OR, NAND, NOR, NOT) via electrical bias and polarization control, without requiring hardware modifications. The OELG device demonstrates stable performance over 10^9 cycles with no degradation, meeting practical application requirements. Furthermore, a convolutional neural network (CNN)-integrated image encryption-decryption framework was validated, achieving 95.01% recognition accuracy on decrypted data, while unauthorized decryption attempts resulted in significant feature loss. This study addresses security challenges in optical communication networks by proposing an innovative solution that integrates pyroelectric materials with reconfigurable logic gate technology, offering a new pathway to enhance physical-layer security.

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SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3429-x

Photopatternable Gel Electrolytes for Stretchable Solid-State Organic Electrochemical Transistors

Organic electrochemical transistors (OECTs) offer high transconductance and biocompatibility for wearable biosensing, yet their deployment in conformal, long-term electrophysiological monitoring is constrained by the mechanical mismatch and leakage of liquid electrolytes. This work introduces a double-network stretchable gel electrolyte that simultaneously achieves a Young’s modulus of 114 kPa and an elongation at break of 640%, matching soft biological tissues while enabling photopatterning for high-density device arrays. Integrating this electrolyte with a stretchable PEDOT:PSS channel yields solid-state OECTs with a volumetric capacitance–mobility product ([μC*]) of 317.71 ± 11.61 F cm⁻¹ V⁻¹ s⁻¹ and an average transconductance of 7.89 mS across uniform arrays. Under 50% tensile strain, the devices maintain stable electrical performance and acquire electrocardiogram signals with a signal-to-noise ratio of approximately 30 dB. The fabrication route is low-cost and compatible with solution processing, addressing the trade-off between ionic conductivity and mechanical robustness that has hindered previous gel electrolytes. These results demonstrate a viable pathway for stretchable, solid-state OECTs in ambulatory cardiac monitoring and high-resolution biointerfaces, where mechanical compliance and signal fidelity are paramount.

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SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3349-2

Cu–O geometric coordination induced facet evolution of derived Cu catalysts for efficient CO2 electroreduction

Oxide-derived copper (OD-Cu) catalysts are pivotal for the selective electroreduction of CO2 to multi-carbon (C2+) products, yet the reconstruction pathways that dictate active facet formation remain inadequately resolved. This study introduces a 'framework-dissolution' strategy to modulate the Cu–O geometric coordination in precursor oxides by incorporating inert elements, thereby directing the reconstruction process. In situ X-ray diffraction and Raman spectroscopy reveal that distinct Cu–O coordination environments—specifically tetrahedral versus octahedral—govern the evolution of OD-Cu facets. Tetrahedral coordination yields a dominant Cu(200) facet, whereas octahedral coordination favors Cu(111). The OD-Cu t catalyst, enriched in (200) facets, achieves a Faradaic efficiency for C2+ products (FEC2+) of 75.1% at a partial current density of −187.8 mA cm−2, significantly outperforming its (111)-dominated counterpart. Density functional theory calculations attribute this enhancement to the lower energy barrier for C–C coupling on the (200) surface. These findings establish a direct correlation between precursor coordination geometry and catalytic performance, offering a rational design principle for high-efficiency CO2 reduction catalysts.

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