Qiqihar University (Chinese: 齐齐哈尔大学; pinyin: Qíqíhār Dàxué) is an institution for higher education, founded in 1953 in Qiqihar city of Heilongjiang province in northeast China. Its campus has an area of 1.15 km². It is the only provincial, comprehensive, regular institution of higher learning in the western part of Heilongjiang Province.It is beside Labor Lake in the city of Qiqihar. Covering an area of 1.25 square kilometers with a building area of 720,000 square meters, it is nicknamed 'The Round Lake University' and has been awarded titles such as 'Garden University' and 'Provincial Model Unit' by the Heilongjiang Provincial Committee of the CPC and the People's Government of Heilongjiang Province.
Background The persistent bottlenecks of rapid photogenerated charge recombination and inefficient solar photon harvesting severely constrain the widespread practical implementation of photocatalytic degradation. Methods A three-dimensional flower-like BiOCl photocatalyst, doped with Zr4+ and featuring abundant oxygen vacancies resulting from such doping, was successfully synthesized. Significant Findings The optimized Zr-BiOCl photocatalyst exhibited a significantly enhanced degradation rate, removing 97% of RhB within 50 min under visible light, which is approximately 4.53 times higher than that of unmodified BiOCl. ESR analysis identified superoxide radicals (•O2-) and photogenerated holes (h+) as the dominant reactive species. Furthermore, LC–MS and QSAR analyses confirmed that the ecological toxicity of the degradation intermediates progressively decreased during the reaction, demonstrating that the coordinated doping-defect engineering is an effective route for developing high-performance and environmentally compatible BiOCl-based photocatalysts.
Escalating climate volatility, particularly the El Ni & ntilde;o/Southern Oscillation (ENSO), poses severe operational and financial risks to corporate sustainability in the energy sector. However, quantitative evidence regarding how macro-level climate shocks transmit to micro-level operational performance remains scarce. Integrating dynamic capability and social network theories, this study analyzes a panel of 103 Chinese listed energy firms (2005-2022) using System GMM, mediation, and moderation models. The results indicate that ENSO intensity significantly impairs performance; specifically, a 1 degrees C rise in sea surface temperature anomalies decreases firms' return on assets (ROAs) by 0.142%. We identify supply chain resilience as a critical strategic mechanism for climate adaptation, where response capacity acts as the dominant mediating channel, while recovery capacity functions as an independent compensatory mechanism. Conversely, supply network complexity-across horizontal, vertical, and spatial dimensions-amplifies the negative impact of climate disruptions by hindering resource mobility. Heterogeneity analysis reveals that state-owned enterprises exhibit stronger institutional resilience, and firms in southern regions partially offset impacts through hydropower advantages. This study bridges climate science with operations management, offering strategic guidance for managers to configure resilient, sustainable supply chains capable of withstanding environmental turbulence.
The hollow structure of transition metal selenides can significantly boost the energy storage capability thanks to their attractive two-dimensional nanostructure and large exposed surface area. In this study, the heterostructured NiSe2/MoSe2/NF microspheres with cavity structure were obtained via a hydrothermal selenization process. The duration of the selenization process significantly affected both the electrode materials' morphology and capacity properties. Electrochemical testing conveyed that the NiMoSe-6 microspheres (NiSe2/MoSe2) treated with selenium for 6 h were the best, measuring 275 mAh g(-1) at 1 A g(-1). In addition, the NiSe2/MoSe2//AC device presented an impressive specific energy density of 53.7 Wh kg(-1) at a density of 749.9 W kg(-1). Furthermore, the two homemade pieces of the NiSe2/MoSe2//AC device in series (2 & times; 2 cm(2)) successfully powered multicolored LED lights or an electronic timer. The strategy of enhancing performance by regulating selenization time serves as a valuable guideline for designing advanced transition metal selenides.
To explore potential pathways for performance enhancement, this study investigates the effect of an external electric field on porphyrin-based dye-sensitized solar cells (DSSCs). Focusing on the porphyrin-based Dye 31, we systematically investigated the electronic structure characteristics of the dyes and Dye@TiO2 system, as well as the regulatory mechanism of the local electric field on some parameters. Comparative analysis revealed that Dye 31 exhibits superior overall performance over Dye 25 across multiple metrics, featuring a smaller energy gap (Eg), enhanced intramolecular charge transfer (ICT), and a longer excited-state lifetime (tau). The 31@TiO2 system exhibits significant charge separation, high electron injection, and better optoelectronic performance. Furthermore, the influence of local electric field strength on energy levels and gaps, spectra and charge transfer was discussed. This work provides insight into the photoelectric performance of chlorophyll derivative dyes and the mechanism of electric field influence.
Surface defects on perovskite films induce non-radiative charge recombination, which remains a primary factor limiting the open-circuit voltage (V OC) and overall performance of perovskite solar cells (PSCs). Herein, we introduce a passivation strategy employing two amine hydrochlorides, N-(2-aminoethyl)maleimide hydrochloride (AEMCl) and N-(2-aminoethyl)phthalimide hydrochloride (AEPCl), which yield distinctly different interfacial phase behaviors on the perovskite top surface. Intriguingly, AEPCl promotes the formation of n = 1 Ruddlesden-Popper (RP) phases at the interface, whereas AEMCl suppresses such low-dimensional phases and effectively passivates residual PbI2. Consequently, the AEMCl-treated device achieves a superior power conversion efficiency (PCE) of 26.14% with a V OC of 1.164 V, outperforming both the control (24.72%) and AEPCl-treated devices (25.46%). Furthermore, unencapsulated AEMCl-modified devices exhibited excellent durability, retaining 89.78% of their initial PCE after 4500 h of storage in N2 atmosphere. Under continuous one-sun illumination and maximum power point tracking (MPPT) in N2 at room temperature, the device maintained 85.01% of its initial efficiency after 1000 h. At the molecular level, this work demonstrates how molecular structure dictates the phase behavior of perovskites.
