Yiwen Tang

A trace, high-efficiency multifunctional hydroxyacetamide electrolyte additive is designed to mitigate Zn anode issues in aqueous zinc-ion batteries, delivering outstanding cycling stability and ultrahigh coulombic efficiency.

Lithium metal anodes are regarded as the "holy grail" of anode materials, yet uncontrolled lithium dendrite growth and unstable solid electrolyte interphase (SEI) remain the two major bottlenecks hindering their practical application. To address these critical challenges, we design and fabricate a cobalt-doped SnS2/SnO2 heterostructure grown on flexible carbon cloth via a facile hydrothermal method. Combining experimental characterizations and density functional theory (DFT) calculations, we reveal a novel synergistic electronic regulation mechanism: the SnS2/SnO2 heterointerface generates a spontaneous built-in electric field (BEF) through intrinsic charge redistribution, while Co-induced spin-polarized electronic redistribution around S sites creates more favorable Li-affinitive regions, which contributes to more homogeneous Li adsorption and deposition. This dual electronic regulation not only guides ordered lithium nucleation and uniform deposition but also modulates the formation of a stable SEI layer enriched with inorganic components. Electrochemical tests demonstrate exceptional performance: symmetric cells exhibit stable long-term cycling at low voltage, and full cells show excellent capacity retention and significantly enhanced Li+ diffusion kinetics. This work unravels the critical role of electron spin polarization in Li+ flux homogenization and demonstrates an effective synergistic electronic engineering strategy for high-performance dendrite-free lithium metal anodes.

Chemical bath deposition (CBD) has proved to be a reliable method for fabricating SnO₂ electron transport layers for perovskite solar modules, yet the critical nanoparticle−nanoparticle and nanoparticle−substrate interactions governing uniform film formation remain insufficiently understood. Here, we demonstrate a synergistic electrostatic interaction regulation strategy that simultaneously modulates colloidal stability among nanoparticles and enhances their binding affinity to the fluorine-doped tin oxide substrate during CBD. This method enables controlled assembly of SnO₂ nanoparticles and promotes continuous film formation over large areas. The resulting perovskite solar cells (active area 0.0727 cm²) achieve a power conversion efficiency of 26.47% (26.03% certified) with a remarkable fill factor of 85.6%, representing one of the highest performances reported to date for perovskite solar cells employing CBD-derived SnO₂. More importantly, this strategy markedly mitigates efficiency loss when increasing the size of the devices, yielding an efficiency of 24.70% for a 1 cm² device and over 21% for a solar module with an active area of 65.24 cm².

The development of electrode materials that simultaneously possess high energy density and excellent cycling stability remains a critical challenge hindering the widespread application of supercapacitors. Consequently, traditional binary layered double hydroxides (LDHs) suffer from nanosheet stacking and limited active sites. To address this issue, this paper proposes an innovative strategy to construct ternary LDHs using metal–organic frameworks (MOFs) as precursor templates. Three-dimensional nanoflower-like ZnCo–Ni LDHs (ZCN-LDHs) were fabricated on a ZnCo-MOF template via in situ nickel ion introduction and an optimized solvothermal process. This unique 3D hierarchical architecture effectively inhibits the stacking of nanosheets and provides abundant ion transport pathways. Benefiting from the proposed synergistic interplay among Zn, Co, and Ni ions within the unique 3D architecture, the ZCN-LDHs-180_2h electrode delivers a high specific capacity of 2288 F g⁻¹ at 1 A g⁻¹. This enhanced performance is hypothesized to originate from the combined effects of improved electronic structure and increased redox activity, as suggested by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) analyses. Furthermore, an asymmetric supercapacitor (ASC) assembled with ZCN-LDHs-180_2h and commercial activated carbon (AC) achieves an energy density of 39.1 Wh kg⁻¹ at a power density of 750 W kg⁻¹.

A trace of thioacetamide (TAA) added to ZnSO ₄ solution regulates the inner Helmholtz structure for dendrite-free zinc deposition. In a ZnSO ₄ electrolyte with 10 mM TAA, the reversibility of zinc is nearly 13 times higher than in pure ZnSO ₄ .

The incorporation of Co²⁺ and the construction of heterostructures effectively enhance ion diffusion and reaction kinetics, thereby contributing to the high-performance storage of lithium and sodium ions.

The abundant defects on the perovskite surface greatly impact the efficiency improvement and long-term stability of carbon-based perovskite solar cells. Molecules with electron-donating or electron-withdrawing functional groups have been cited for passivating various defects. However, few studies have investigated the potential adverse effects arising from the synergistic interactions among functional groups. Herein, we investigate the correlation between functional group configurations and passivation strength as well as the potential adverse impacts of strong electrostatic structures by methodically designing three distinct interface molecules functionalized with different ending groups, which both belong to biguanide derivatives, including 1-(3,4-dichlorophenyl) biguanide hydrochloride (DBGCl), metformin hydrochloride (MFCl), and biguanide hydrochloride (BGCl). The results indicate that DBGCl establishes comparatively mild active sites, not only passivates defects but also aids in forming a surface with a uniform potential. Conversely, MFCl exerts a more pronounced adverse effect on the perovskite surface, which is attributable to the electronic state perturbations induced by its functional groups. Due to the lack of hydrophobic groups, devices treated with BGCl demonstrate insufficient moisture resistance. Devices passivated with DBGCl demonstrate superior average efficiency, showcasing a 12% enhancement relative to the pristine. Furthermore, DBGCl-treated devices exhibit enhanced stability in three different environments, respectively, achieving the highest PCE retention rates under nitrogen conditions (25 degrees C), room-temperature air conditions (25 degrees C, RH = 40 +/- 2%), and high-temperature air conditions (65 degrees C, RH = 40 +/- 2%).