Shuang Liu

While product-induced inhibition is widely recognized in heterogeneous catalysis, the joint influence of co-generated products on time-dependent catalytic deactivation remains underexplored. Herein, uniform colloidal Pt nanoparticles were deposited on anatase TiO2 supports selectively exposing (101) or (001) facets to fabricate two facet-controlled model Pt/TiO2 catalysts. We uncovered the intrinsic deactivation mechanism for low-temperature lean propylene combustion via stability tests, alternating feed kinetics, in situ DRIFTS, and density functional theory (DFT) calculations. Time-on-stream reaction tests recorded persistent activity decay for both catalysts, with far more serious decay observed on Pt/TiO2(101). Multiple characterization results excluded Pt sintering/encapsulation, C3H6/O2 poisoning, and partial Pt oxidation as dominant degradation factors. Instead, CO2 adsorption and subsequent carbonate accumulation on TiO2 surfaces were identified as the primary deactivation sources, which cut off supplementary oxygen delivery at metal–support interfaces. DFT adsorption energy data proved that H2O possessed a stronger surface affinity than CO2 on both facet types, and in situ generated H2O competed for adsorption sites to curb carbonate accumulation. Apart from this competitive effect, reaction-derived H2O alleviated excessive coverage of Pt sites by C3H6 and facilitated the adsorption and activation of gas-phase O2. Thanks to the relatively high water-binding capacity of TiO2(001), the corresponding Pt/TiO2(001) catalyst maintained abundant interfacial water during operation and exhibited much milder carbonate-triggered decay. These findings clarified the competitive co-adsorption interplay between CO2 and H2O across Pt–TiO2 interfaces and offered general kinetic guidance for developing durable catalysts toward industrial hydrocarbon lean combustion.

All‐solid‐state lithium metal batteries (SSLMBs) are promising next‐generation energy‐storage devices, but their practical application is hindered by the low ionic conductivity, low Li ⁺ transference number, and poor interfacial stability of solid‐state electrolytes, particularly under near‐room‐temperature conditions. To address these challenges, we developed PEO/LiTFSI‐Mg _1‐x Li _x F ₂ composite electrolytes based on a novel electrostatic suspension strategy. At the filler/polymer interface, Mg _1‐x Li _x F ₂ and PEO generate dynamically balanced yet oppositely directed electrostatic fields, in which Li ⁺ remains in a “suspended” state. The continuous low‐energy transport channels formed by these interfacial suspension sites enable directional and rapid Li ⁺ slip migration along the interface under an external electric field. The optimized composite electrolyte exhibits an ionic conductivity of 0.158 mS cm ⁻¹ and a Li ⁺ transference number of 0.56 at 30°C. Benefiting from the electrostatic suspension effect and the in situ formed LiF‐rich SEI, Li||Li symmetric cells cycle stably for over 2650 h at 0°C. Moreover, SSLMBs with LFP cathodes deliver excellent rate capability and cycling stability, with 98% capacity retention after 300 cycles at 0°C. This work establishes an electrostatic suspension mechanism for the design of polymer electrolytes and provides new insights into high‐performance SSLMBs operating over a wide temperature range.

BiO _x @BiO/Bi nanoflakes are prepared by electrochemical reconstruction, showing a flower open and close structral evolution in charge and discharge process and excellent electrochemical performance.