Prof. Weiwei Xiong | Publications & Academic Profile | SinoGreenTech

Research Publications & English Decoded Briefs

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-026-4432-9

Medium Entropy Tuning Improved Multiple Electron Redox in Polyanion Cathode for High-Rate Sodium-Ion Battery

Sodium vanadium phosphate (Na3V2(PO4)3, NVP) with NASICON structure is a promising cathode for sodium-ion batteries but suffers from low electronic conductivity and a high energy barrier for the V4+/V5+ redox couple, limiting practical energy density. A medium-entropy tuning strategy yields the multi-element substituted Na3.2V1.5Cr0.1Fe0.1Mn0.1Ni0.1Ti0.1(PO4)3 (ME-NVP). Entropy modulation tailors the microscopic electronic structure, enabling reversible V4+/V5+ redox at 4.0 V. Analyses reveal a synergistic diffusion mechanism that accelerates Na+ transport and enhances multiple-electron redox kinetics. Ex-situ X-ray diffraction confirms highly reversible structural evolution during cycling. The ME-NVP cathode delivers 116.8 mAh g-1 at 0.1C and retains 83.9% of initial capacity after 1000 cycles at 20C, with excellent performance from -12 to 50 °C. This work demonstrates that configurational entropy regulation unlocks high-energy polyanion cathodes for advanced sodium-ion batteries.

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-026-4114-5

Experimental Realization of Mixed-Dimensional 1D-Graphyne-Nanowires/2D-AgTe-Monolayer Heterostructures

The precise and controllable synthesis of one-dimensional (1D) and two-dimensional (2D) heterostructures, coupled with the manipulation of their atomic and electronic configurations, is of paramount significance. However, due to the synthetic challenges associated with graphyne (GY) materials, their integration into 1D/2D heterostructures remains considerably difficult. Herein, we demonstrate a post-synthetic intercalation strategy for tellurium onto Ag(111), enabling the controllable fabrication of 1D-GY-nanowire/2D-AgTe-monolayers heterostructures. Scanning-probe microscopies are employed to characterize morphological evolution during the intercalation process. Scanning tunneling spectroscopy results confirm that AgTe monolayer intercalation induces interfacial decoupling of the graphyne nanowires. Density functional theory calculations demonstrate that work function-driven Fermi level modulation via interfacial charge engineering assigns the 1D-GY-nanowire/2D-AgTe-monolayers heterostructures as type-I heterostructures. Our work not only significantly advances the fundamental understanding of interfacial interactions in 1D/2D heterostructures but also presents a scalable strategy for designing heterostructures with tailored electronic functionalities, thereby opening new avenues for applications in advanced nanoelectronics and optoelectronic devices.

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3810-y

Elucidating the distinct roles of metal ion doping and alloying in MOF reconstruction toward enhanced oxygen evolution reaction

Amorphous metal-organic frameworks (aMOFs), with abundant defects and unsaturated coordination sites, are ideal precursors for investigating electrocatalytic reconstruction mechanisms. However, systematic understanding of how different modulation strategies affect reconstruction pathways and final active species remains lacking. Here, an amorphous MOF constructed from 3,4,9,10-pyrene-tetracarboxylic acid (PTA) serves as a controllable precursor to compare doping and alloying effects on structural reconstruction and oxygen evolution reaction (OER) performance. Doping promotes preferential reconstruction into Fe-rich (oxy)hydroxides with more exposed active sites, whereas alloying yields Fe-Co mixed (oxy)hydroxides with limited site exposure. The doped system FeCo0.05-PTA exhibits outstanding OER activity in alkaline conditions, with overpotentials of 208 and 248 mV at 50 and 100 mA cm−2, respectively, and a low Tafel slope of 36.2 mV dec−1. In situ Fourier transform infrared spectroscopy (FTIR) captures the OOH* intermediate, confirming the adsorbate evolution mechanism. Density functional theory (DFT) calculations show the doped system has the lowest free-energy barrier (ΔG = 0.59 eV) at the rate-determining step. This study underscores the decisive role of precursor design, elucidates distinct effects of doping and alloying on reconstruction pathways and final properties of amorphous MOF-derived (oxy)hydroxides, and provides insights for designing related electrocatalysts.

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