Interfacial Connections between Organic Perovskite/n+ Silicon/Catalyst that Allow Integration of Solar Cell and Catalyst for Hydrogen Evolution from Water

The rapidly increasing solar conversion efficiency (PCE) of hybrid organic–inorganic perovskite (HOIP) thin-film semiconductors has triggered interest in their use for direct solar-driven water splitting to produce hydrogen. However, application of these low-cost, electronic-structure-tunable HOIP tandem photoabsorbers has been hindered by the instability of the photovoltaic-catalyst-electrolyte (PV+E) interfaces. Here, photolytic water splitting is demonstrated using an integrated configuration consisting of an HOIP/n⁺silicon single junction photoabsorber and a platinum (Pt) thin film catalyst. An extended electrochemical (EC) lifetime in alkaline media is achieved using titanium nitride on both sides of the Si support to eliminate formation of insulating silicon oxide, and as an effective diffusion barrier to allow high-temperature annealing of the catalyst/TiO₂-protected-n⁺silicon interface necessary to retard electrolytic corrosion. Halide composition is examined in the (FA_1-xCs_x)PbI₃ system with a bandgap suitable for tandem operation. A fill factor of 72.5% is achieved using a Spiro-OMeTAD-hole-transport-layer (HTL)-based HOIP/n⁺Si solar cell, and a high photocurrent density of −15.9 mA cm⁻² (at 0 V vs reversible hydrogen electrode) is attained for the HOIP/n⁺Si/Pt photocathode in 1 m NaOH under simulated 1-sun illumination. While this thin-film design creates stable interfaces, the intrinsic photo- and electro-degradation of the HOIP photoabsorber remains the main obstacle for future HOIP/Si tandem PEC devices.     

A Hybrid Strategy-Based Ultra-Narrow Stretchable Microelectrodes with Cell-Level Resolution

Stretchable ultra-narrow (e.g., 10 µm in width) microelectrodes are crucial for the electrophysiological monitoring of single cells providing the fundamental understanding to the working mechanism of neuro network or other electrically functional cells. Current fabrication strategies either focus on the preparation of normal stretchable electrodes with hundreds of micrometers or millimeters in width by using inorganic conductive materials or develop conductive organic polymer gel for ultra-narrow electrodes which suffer from low stretchability and instability for long-term implantation, therefore, it is still highly desirable to explore bio-interfacial ultra-narrow stretchable inorganic electrodes. Herein, a hybrid strategy is reported to prepare ultra-narrow multi-channel stretchable microelectrodes without using photolithography or laser-assisting etching. A 10 µm × 10 µm monitoring window is fabricated with enhanced interfacial impedance by the special rough surface. The stretchability achieves to 120% for this 10 µm-width stretchable electrode. Supported by these superior properties, it is demonstrated that the stretchable microelectrodes can detect electrophysiological signals of single cells in vitro and collect electrophysiological signals more precisely in vivo. The reported strategy will open up the accessible preparation of the fine-size stretchable microelectrode. It will significantly improve the resolution of monitoring and stimulation of inorganic stretchable electrodes.     

无机固体电解质Li7La3Zr2O12的制备及掺杂改性研究进展

无机固体电解质由于其安全性能高、能量密度大等特点备受研究者的青睐。其中Garnet型锂离子无机固体电解质Li_7La_3Zr_2O_(12)具有较高的离子导电率,较低的界面电阻,优良的稳定性能和电化学性能,在未来的全固态锂离子电池、锂空气电池等领域有着广阔的应用前景。主要从Li_7La_3Zr_2O_(12)的晶体结构、制备工艺和掺杂改性等方面详细阐述无机固态电解质Li_7La_3Zr_2O_(12)的研究进展。     

混凝土无机表面处理技术研究进展

混凝土表面处理能够显著改善混凝土表面渗透性,与有机表面处理相比,无机表面处理既能提升混凝土的耐久性,又具有较强的抗老化性能,发展前景比有机表面处理更广阔。对不同无机表面处理研究工作进行了总结对比,分析了无机表面处理的作用机理及其对混凝土耐久性的影响,以期为无机表面处理技术的进一步研究和其在工程中的应用提供指导和帮助。     

Simplified Perovskite Solar Cell with 4.1% Efficiency Employing Inorganic CsPbBr3 as Light Absorber

Perovskite solar cells with cost‐effectiveness, high power conversion efficiency, and improved stability are promising solutions to the energy crisis and environmental pollution. However, a wide‐bandgap inorganic–semiconductor electron‐transporting layer such as TiO₂ can harvest ultraviolet light to photodegrade perovskite halides, and the high cost of a state‐of‐the‐art hole‐transporting layer is an economic burden for commercialization. Here, the building of a simplified cesium lead bromide (CsPbBr₃) perovskite solar cell with fluorine‐doped tin oxide (FTO)/CsPbBr₃/carbon architecture by a multistep solution‐processed deposition technology is demonstrated, achieving an efficiency as high as 4.1% and improved stability upon interfacial modification by graphene quantum dots and CsPbBrI₂ quantum dots. This work provides new opportunities of building next‐generation solar cells with significantly simplified processes and reduced production costs.     

直接Z-型立方/六方ZnIn2S4复合光催化剂的制备及其光催化性能

通过水热反应方法制备出立方相ZnIn₂S₄和六方相ZnIn₂S₄和系列不同摩尔比的复合相ZnIn₂S₄光催化剂,使用X射线衍射、扫描电子显微镜、电子能谱、透射电子显微镜、光致发光光谱、N₂吸附-脱附法及紫外-可见光漫反射等手段表征了样品的晶体结构、显微结构及吸光特性并在可见光照射下进行了甲基橙降解实验。结果表明,复合相ZnIn₂S₄样品都具有比立方相、六方相和机械混合的ZnIn₂S₄更好的可见光催化活性,当复合相ZnIn₂S₄样品中立方相与六方相摩尔比为3:7时体系的催化活性最高。这种样品被可见光照射30 min后,甲基橙的降解率达到95.2%。其降解机理与样品较大的比表面积以及样品中的立方相与六方相之间的密切接触而形成直接Z-型光催化过程有关。