Science Bulletin最新文献_第6页

Thermally stable ethylammonium doping strategy for pure red emission in CsPbI₃ quantum dot light-emitting diodes. CsPbI3量子点发光二极管中纯红发射的热稳定乙胺掺杂策略。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-08-05 DOI: 10.1016/j.scib.2025.07.039

Jing Li, Xiuyuan Chen, Yifeng Feng, Xiaofeng Hu, Jialiang Liu, Jiajie Ye, Chenchen Yang, Qingquan He, Haiping He, Zhizhen Ye, Xingliang Dai, Jun Pan

{"title":"Thermally stable ethylammonium doping strategy for pure red emission in CsPbI3 quantum dot light-emitting diodes.","authors":"Jing Li, Xiuyuan Chen, Yifeng Feng, Xiaofeng Hu, Jialiang Liu, Jiajie Ye, Chenchen Yang, Qingquan He, Haiping He, Zhizhen Ye, Xingliang Dai, Jun Pan","doi":"10.1016/j.scib.2025.07.039","DOIUrl":"https://doi.org/10.1016/j.scib.2025.07.039","url":null,"abstract":"All-inorganic CsPbI3 quantum dots (QDs) exhibit remarkable optoelectronic properties, identifying them as promising candidates for advanced display materials. However, achieving pure-red emission from CsPbI3 QDs remains a significant challenge due to limitations in bandgap tuning using conventional high-temperature hot-injection methods. Introducing A-site cations, such as ethylammonium (EA+), has been shown to modulate near-edge states by inducing lattice distortions. Nevertheless, the thermal instability of EA+ salts at high temperatures poses a major obstacle in achieving stable doping. To address this challenge, we harnessed the acid-base equilibrium between ethylammonium salts and oleic acid in the cesium precursor, enabling the in situ formation of thermally stable ethylammonium oleate. This innovation allowed the precise tuning of the emission wavelength within 630-650 nm by controlling EA+ doping levels. After optimization of the EA+ doping concentration and device architecture, pure-red perovskite light-emitting diodes were achieved with an external quantum efficiency up to 26.1 %. Our findings present a groundbreaking methodology for bandgap engineering of CsPbI3 QDs, providing pivotal insights for the development of advanced perovskite optoelectronic materials and devices.","PeriodicalId":421,"journal":{"name":"Science Bulletin","volume":" ","pages":""},"PeriodicalIF":21.1,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144938125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Climate change will undermine the pivotal role of Asian water tower in water resources supply. 气候变化将削弱亚洲水塔在水资源供应中的关键作用。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-25 DOI: 10.1016/j.scib.2025.07.031

Lei Wang, Junshui Long, Tandong Yao, Jing Zhou

引用次数: 0

The quest for neutrinoless double-beta decay: a theoretical breakthrough. 对中微子双衰变的探索：一个理论突破。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-25 DOI: 10.1016/j.scib.2025.07.034

Dario Vretenar

引用次数: 0

Spark the immunization by seeding bifidobacteria in early life. 通过在生命早期播种双歧杆菌来激发免疫。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-25 DOI: 10.1016/j.scib.2025.07.038

Shuqin Zeng, Dezhi Mu, Shaopu Wang

引用次数: 0

Modeling spatial processes of extreme heat impacts on global economy: a multi-scale spatio-temporal approach. 极端高温对全球经济影响的空间过程模拟：一个多尺度时空方法。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-24 DOI: 10.1016/j.scib.2025.07.035

Guanpeng Dong, Hang Zhang, Yansui Liu, Changhong Miao

{"title":"Modeling spatial processes of extreme heat impacts on global economy: a multi-scale spatio-temporal approach.","authors":"Guanpeng Dong, Hang Zhang, Yansui Liu, Changhong Miao","doi":"10.1016/j.scib.2025.07.035","DOIUrl":"https://doi.org/10.1016/j.scib.2025.07.035","url":null,"abstract":"Rising frequency, intensity, and geographic scope of extreme heat profoundly impede global sustainable economic development. However, existing climate econometric models are limited in capturing the spatial processes through which extreme heat affects the global economy, often resulting in downward-biased estimates of total economic losses. This study develops a novel multi-scale spatio-temporal model that integrates classic multi-level modeling with spatial statistics, explicitly addressing key challenges faced by climate econometrics. A Bayesian Markov chain Monte Carlo simulation algorithm is derived for model implementation. Using this model, we present the first quantitative assessment of the impacts of extreme heat on global economic production and their scale-dependent spatial processes. Our findings reveal that, at the national scale, economic losses caused by input-output economic linkages initially decline slowly, then drop sharply with increasing connectivity, with an inflection point around 0.1. When accounting for spatial propagation effects, a 1 ℃ increase in extreme heat intensity leads to an average loss of 2.54% [0.90%, 4.19%] of annual GDP per capita-substantially higher than estimates assuming economic losses are locally confined. Moreover, the economic impacts of extreme heat exhibit significant spatial heterogeneity, with positive marginal effects detected in colder regions and negative effects in warmer regions, with a turning point around 33.7 ℃. This study offers a new methodology to evaluate the impact of climate change from a multi-scale and spatial perspective.","PeriodicalId":421,"journal":{"name":"Science Bulletin","volume":" ","pages":""},"PeriodicalIF":21.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144938147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic enhancement of Pt electrocatalyst stability and activity in hydrogen oxidation reaction by polyoxometalate and carbon dot co-boosting. 多金属氧酸盐与碳点协同增强氢氧化反应中Pt电催化剂的稳定性和活性。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-24 DOI: 10.1016/j.scib.2025.07.033

Fei-Yang Yu, Zhong-Ling Lang, Xian Wang, Jing Sun, Yu-Chen Liu, Hua-Qiao Tan, Jun-Jie Ge, Yang-Guang Li, Zhen-Hui Kang

{"title":"Synergistic enhancement of Pt electrocatalyst stability and activity in hydrogen oxidation reaction by polyoxometalate and carbon dot co-boosting.","authors":"Fei-Yang Yu, Zhong-Ling Lang, Xian Wang, Jing Sun, Yu-Chen Liu, Hua-Qiao Tan, Jun-Jie Ge, Yang-Guang Li, Zhen-Hui Kang","doi":"10.1016/j.scib.2025.07.033","DOIUrl":"https://doi.org/10.1016/j.scib.2025.07.033","url":null,"abstract":"Pt-based catalysts are prone to oxidation and CO poisoning during the hydrogen oxidation reaction (HOR), leading to deactivation, which has presented significant challenges for the application of proton exchange membrane fuel cells (PEMFC). Here, we propose a dual-protection strategy with the advantages of Pt-polyoxometalates (POMs) and carbon dots (CDs) to synthesize an advanced POMs-CDs based electrocatalyst, Pt-SiW12-CDs, with Pt clusters dispersed on SiW12-CDs substrates. It exhibited exceptional HOR performance, achieving a mass activity of 10.36 A mgPt-1 at an overpotential of 50 mV, which is over 54 times greater than that of Pt/C (0.19 A mgPt-1). These catalysts also display impressive stability and CO tolerance. By employing X-ray absorption fine structure (XAFS) spectra, transient photovoltage (TPV), transient potential scanning (TPS), and density functional theory (DFT) calculation, the in-depth investigation suggested the muti-roles of SiW12 and CDs for synergistic enhancement of Pt electrocatalyst stability and activity in HOR process. CDs act as bridges, effectively and rapidly transferring protons and electrons to SiW12 from Pt clusters. CDs can effectively coordinate with Pt, regulating its electronic structure while pre-occupying Pt sites, thus hindering CO adsorption on Pt. The reduced SiW12 efficiently transfers electrons to Pt, inhibiting the oxidation of Pt. Additionally, SiW12 also serves as the driving force, maintaining the rapid progression of the HOR process. The dual-protection strategy provides new ideas and directions for design of efficient and stable heterogeneous catalyst.","PeriodicalId":421,"journal":{"name":"Science Bulletin","volume":" ","pages":""},"PeriodicalIF":21.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selective growth of (5, 4) single-walled carbon nanotubes. （5,4）单壁碳纳米管的选择性生长。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-24 DOI: 10.1016/j.scib.2025.07.036

Qianru Wu, Xueting Zhang, Hao An, Liu Qian, Linhai Li, Huaping Liu, Jiayang Zhang, Lili Zhang, Lianming Tong, Maoshuai He, Chang Liu, Feng Ding, Jin Zhang

引用次数: 0

Tailored Fe catalyst microenvironment for highly efficient syngas conversion to olefins with low CO₂ emissions. 量身定制的铁催化剂微环境，高效合成气转化为烯烃，二氧化碳排放量低。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-23 DOI: 10.1016/j.scib.2025.07.032

Di Xu, Yajie Cao, Haifeng Fan, Guoqiang Hou, Yangyang Li, Siyi Huang, Ruosong He, Hanzhu Zhang, Riguang Zhang, Mingyue Ding

{"title":"Tailored Fe catalyst microenvironment for highly efficient syngas conversion to olefins with low CO2 emissions.","authors":"Di Xu, Yajie Cao, Haifeng Fan, Guoqiang Hou, Yangyang Li, Siyi Huang, Ruosong He, Hanzhu Zhang, Riguang Zhang, Mingyue Ding","doi":"10.1016/j.scib.2025.07.032","DOIUrl":"10.1016/j.scib.2025.07.032","url":null,"abstract":"Achieving highly efficient syngas conversion to olefins on the Fe-based catalysts is promising, but remains a big challenge due to the twin coexistence of the Fischer-Tropsch to olefins (FTO) and water gas shift (WGS) reactions. Herein, we developed a strategy via regulating the microenvironment of Fe catalyst and controlling the diffusion behaviors of critical intermediates to successfully realize the syngas conversion to olefins with low CO2 emission. A Fe@C catalyst with Fe species encapsulated in porous carbon was fabricated and achieved high single-pass olefins yield (>30%) and low CO2 selectivity (around 20%) simultaneously, which has ranked the top among the ever-reported advanced oxide-zeolite, Co-based, and Fe-based catalysts. A series of experimental and theoretical results revealed that the unique microenvironment could enrich olefins and inhibit hydrogenation reaction, therefore favoring high value-added olefins formation. Moreover, due to the accelerated diffusion of H2O molecules, the WGS side reaction was obviously inhibited even at high CO conversion. Our research presented a new catalyst design strategy to realize highly efficient and controllable catalysis in syngas conversion.","PeriodicalId":421,"journal":{"name":"Science Bulletin","volume":" ","pages":""},"PeriodicalIF":21.1,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144881751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New evidence for Palaeozoic mineralization in the world-class Bayan Obo rare earth deposit. 世界级白云鄂博稀土矿床古生代成矿作用新证据。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-17 DOI: 10.1016/j.scib.2025.07.008

Weidong Sun, Mingxing Ling

引用次数: 0

RNA immunity: an ancient defense mechanism preserved in mammalian cells. RNA免疫：保存在哺乳动物细胞中的一种古老的防御机制。

IF 21.1 1区综合性期刊

Science Bulletin Pub Date : 2025-07-17 DOI: 10.1016/j.scib.2025.07.024

Zheng Fu, Liang Li, Yanbo Wang, Xin Yin, Xi Chen, Chao Yan, Dangsheng Li, Chen-Yu Zhang

引用次数: 0