Carbon-based Perovskite Solar Cells (C-PSCs) present a promising avenue for enhancing the stability and commercialization of PSCs. However, the power conversion efficiency (PCE) of C-PSCs still lags behind that of metal-based PSCs. In this study, La-BDC (La-MOF prepared by La 3+ and ligand H 2 BDC) has successfully synthesized using a simple hydrothermal method and then directly introduced into CH 3 NH 3 PbI 3 (MAPbI 3 ) perovskite precursor solution to prepare perovskite/La-BDC heterojunction structure with remarkable properties in light absorption , hydrophobicity , and crystallinity . By incorporating this structure, the PCE of C-PSCs with an FTO/SnO 2 /MAPbI 3 /La-BDC/Carbon architecture was effectively enhanced. The presence of C O functional group in La-BDC effectively reduced interface defects while improving carrier separation efficiency, and successfully passivated the free Pb 2+ ions within the perovskite. Remarkably, the La-BDC-based device achieved a superior PCE of 14.95%, surpassing the pristine device's PCE by an impressive margin of 20.37%. Moreover, even after a 31 days period of air storage (temperature range of 15–25℃, humidity range of 15–30%), the La-BDC-based devices maintained over 90% of the initial performance, demonstrating excellent stability. This study provides a facile and effective strategy for improving the PCE and stability of C-PSCs through implementing a La-BDC heterojunction structure， and provides a new idea for MOF materials in the field of PSCs.
Eutrophication of aquatic water bodies and the consequent harmful algal blooms (HABs) induced by excessive phosphorus (P) have become a critical global environmental challenge. In this study, a flower-like spherical metal-organic framework (MOF) material, La-BDC-NH 2 , was successfully synthesized via a hydrothermal method for the simultaneous phosphate adsorption and Microcystis aeruginosa flocculation. Its physicochemical properties were systematically characterized using a suite of analytical techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results of phosphate adsorption performance tests demonstrated that the maximum adsorption capacity of this material for phosphate reached 75.65 mg/g at 25 °C. In the microalgal flocculation experiments, the harvesting efficiency of Microcystis aeruginosa exceeded 95% at the optimal dosage of 0.2 g/L. Notably, La-BDC-NH 2 retained excellent phosphate adsorption and microalgal flocculation performance over a broad pH range (4–10) and initial algal concentration range (OD 680 = 0.1–1.0), thus exhibiting robust adaptability to complex aquatic environments. Furthermore, this material could efficiently convert proteinaceous extracellular organic matter (EOM) released by Microcystis aeruginosa into more stable humic acid-like substances, thereby mitigating the environmental risks associated with EOM accumulation. Ultimately, this study demonstrates that La-BDC-NH 2 is a multifunctional, highly efficient, and stable environmental functional material for aquatic eutrophication control. It has good application prospects in controlling HABs and aquatic eutrophication, and provides a practical and feasible technical strategy for mitigating harmful algal blooms in eutrophic aquatic systems.
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