Journal of Advanced Ceramics•2026•DOI: 10.26599/JAC.2026.9221340
Protonic ceramic fuel cells (PCFCs) offer efficient intermediate-temperature energy conversion but are constrained by the trade-off between insufficient electrode activity and limited operational durability. This work develops a Zn/Yb B-site codoping strategy combined with temperature-induced nanoparticle exsolution to construct a triple-conducting cathode. Cation-driven charge modulation enhances ionic diffusion and electronic conduction, while the exsolved secondary BaCoO3−δ phase increases active site density, optimizes interfacial charge transfer, and promotes oxygen reduction reaction (ORR) kinetics. Zn/Yb codoping redistributes local charge density, weakens metal–oxygen bonds, and reduces oxygen vacancy formation energy, promoting oxygen vacancy generation. The increased oxygen vacancy concentration facilitates surface oxygen activation and lattice hydration, enhancing oxygen-ion and proton transport. Enhanced d–p orbital hybridization improves electronic conductivity and accelerates charge transfer kinetics. Optimized alkaline–earth sites suppress carbonate formation, imparting excellent CO2 tolerance. The optimized cathode delivers a peak power density of 0.99 W·cm−2 at 600 °C and stable operation over 100 h, with a polarization resistance of 0.110 Ω·cm2 under 20% H2O-air. This work provides a novel strategy for optimizing activity, conductivity, and stability in PCFC cathodes.
New Carbon Materials (新型炭材料)•2025•DOI: 10.1016/S1872-5805(NCM2025-5-2)
This data set collects, compares and contrasts the capacities and structures of a series of hard carbon materials, and then searches for correlations between structure and electrochemical performance. The capacity data of the hard carbons were obtained by charge/discharge tests and the materials were characterized by XRD, gas adsorption, true density tests and SAXS. In particular, the fitting of SAXS gave a series of structural parameters which showed good characterization. The related test details are given with the structural data of the hard carbons and the electrochemical performance of the sodium-ion batteries.
New Carbon Materials (新型炭材料)•2025•DOI: 10.1016/S1872-5805(NCM2024-39-06-07)
Carbon with its high electrical conductivity, excellent chemical stability, and structure ability is the most promising anode material for sodium and potassium ion batteries. We developed a defect-rich porous carbon framework (DRPCF) built with N/O-co-doped mesoporous nanosheets and containing many defects using porous g-C3N4 (PCN) and dopamine (DA) as raw materials. We prepared samples with PCN/DA mass ratios of 1/1, 2/1 and 3/1 and found that the one with a mass ratio of 2/1 and a carbonization temperature of 700 °C in an Ar atmosphere (DRPCF-2/1-700), had a large specific surface area with an enormous pore volume and a large number of N/O heteroatom active defect sites. Because of this, it had the best pseudocapacitive sodium and potassium ion storage performance. A half battery of Na//DRPCF-2/1-700 maintained a capacity of 328.2 mAh g−1 after being cycled at 1 A g−1 for 900 cycles, and a half battery of K//DRPC-2/1-700 maintained a capacity of 321.5 mAh g−1 after being cycled at 1 A g−1 for 1200 cycles. The rate capability and cycling stability achieved by DRPCF-2/1-700 outperforms most reported carbon materials. Finally, ex-situ Raman spectroscopy analysis result confirms that the filling and removing of K+ and Na+ from the electrochemically active defects are responsible for the high capacity, superior rate and cycling performance of the DRPCF-2/1-700 sample.
Journal of Semiconductors (半导体学报 - 中国科学院半导体研究所)•2025•DOI: 10.1088/1674-4926/25020033
To optimize turn on velocity of the SiC LIMS, we proposed a new structure for the LIMS that incorporates an optimized n+ layer and a multi-light triggered electrode design for the anode. The chip size is 5.5 mm × 5.5 mm in dimension. The experiment results indicate that the saturation laser energy required to trigger the prepared SiC LIMS has been decreased from 1.8 mJ to 40 μJ, with the forward blocking voltage of the prepared SiC LIMSs capable of withstanding over 7000 V. The leakage current is about 0.3 μA at room temperature, and the output current density achieves 4.25 kA/cm2 (with di/dt larger than 20 kA/μs).
Chinese Journal of Mechanical Engineering•2025•DOI: 10.1186/s10033-025-01315-6
Short-arc machining is a novel electrical discharge machining method that utilizes high-energy arc discharge as the energy carrier. Due to its low cost and high processing efficiency, it has been widely applied in the efficient processing of superalloys. To address the challenges of efficient and high-precision processing of superalloys, a processing method combining short-arc machining with precision milling is employed. Advanced material characterization techniques such as electron backscatter diffraction (EBSD) are utilized to analyze the physical properties of the recast layer and surface crystal characteristics. High-temperature low-cycle fatigue life tests are conducted to investigate the correlation between fatigue life and typical surface integrity parameters (surface roughness, residual stress), as well as crystallographic parameters (grain size, grain orientation spread, geometrically necessary dislocations). Processing parameter optimization is achieved with fatigue life as the target. The results indicate that at high temperatures during short-arc machining, the surface material underwent recrystallisation to form a recast layer with a grain size reduction of 85.5% and a heat affected layer depth of over 400 μm. The trends in fatigue life are consistent with changes in residual stress, grain orientation spread and geometrically necessary dislocations. Selecting a larger axial depth of cut and lower feed per tooth is advantageous for achieving a higher fatigue life. The proposed research provides an instruction for high efficient precision machining of superalloys.
Int. Journal of Minerals, Metallurgy and Materials (矿物冶金与材料学报)•2025•DOI: 10.1007/s12613-024-2959-8
In this work, we realized a room-temperature nitrogen dioxide (NO2) gas sensor based on a platinum (Pt)-loaded nanoporous gallium nitride (NP-GaN) sensing material using the thermal reduction method and coreduction with the catalysis of polyols. The gas sensor gained excellent sensitivity to NO2 at a concentration range of 200 ppm to 100 ppb, benefiting from the loading of Pt nanoparticles, and exhibited a short response time (22 s) and recovery time (170 s) to 100 ppm of NO2 at room temperature with excellent selectivity to NO2 compared with other gases. This phenomenon was attributed to the spillover effect and the synergic electronic interaction with semiconductor materials of Pt, which not only provided more electrons for the adsorption of NO2 molecules but also occupied effective sites, causing poor sites for other gases. The low detection limit of Pt/NP-GaN was 100 ppb, and the gas sensor still had a fast response 70 d after fabrication. Besides, the gas-sensing mechanism of the gas sensor was further elaborated to determine the reason leading to its improved properties. The significant spillover impact and oxygen dissociation of Pt provided advantages to its synergic electronic interaction with semiconductor materials, leading to the improvement of the gas properties of gas sensors.