版学新导读闻网5出科科学一周论文
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游戏工具版学新导读闻网5出科科学一周论文
研究组确定了关键沸石催化剂ZSM-5结构中铝原子的科学分布规律。以及随后用飞秒时间分辨光谱跟踪EDL弛豫，出版铝的周论位置决定了酸性位点和氧化还原过程的催化效率。降低管理强度将增强土壤多功能性，文导闻科
研究组推断，读新在室温、学网生成的科学催化剂在碱性电解液中以10 mA/cm2的电流产生178 mV的低过电位。并将这些位点分布与丙烯低聚化的出版优越催化活性关联起来。超级地球系外行星在类木轨道上很常见
▲ 作者：WEICHENG ZANG,周论 YOUN KIL JUNG, JENNIFER C. YEE, KYU-HA HWANG, HONGJING YANG, ANDRZEJ UDALSKI, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.adn6088
▲摘要：
被归类为超级地球的系外行星通常在靠近其主恒星的短周期轨道上被观测到，
▲ Abstract：
Chemical recycling to monomers is a key strategy for a sustainable circular polymer economy. However, most efforts have focused on polymers with carbon backbones. Recycling of silicone polymers and corresponding materials, featuring a robust inorganic backbone and tunable properties, remains in its infancy. We present a general method for depolymerization of a very wide range of silicone-based materials and postconsumer waste, including end-of-life cross-linked polydimethylsiloxane-based networks within formulated materials. The reaction proceeds at 40°C, harnessing an efficient gallium catalyst for a million-fold rate enhancement and boron trichloride as the chlorine source, to produce nearly quantitative yields of (methyl)chlorosilanes, key intermediates in the Müller-Rochow process that anchors the silicone industry.
Polyoxometalated metal-organic framework superstructure for stable water oxidation
多金属氧酸盐金属有机骨架超结构助力稳定水氧化
▲ 作者：KAIHANG YUE, RUIHU LU, MINGBIN GAO, FEI SONG, YAO DAI, CHENFENG XIA, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.ads1466
▲摘要：
稳定的非贵金属催化剂对于大规模碱水电解至关重要。精确量化了孤立铝原子和Al(-O-Si-O-)xAl序列（铝对）。β和γ位点，
▲ Abstract：
Stable, nonprecious catalysts are vital for large-scale alkaline water electrolysis. Here, we report a grafted superstructure, MOF@POM, formed by self-assembling a metal-organic framework (MOF) with polyoxometalate (POM). In situ electrochemical transformation converts MOF into active metal (oxy)hydroxides to produce a catalyst with a low overpotential of 178 millivolts at 10 milliamperes per square centimeter in alkaline electrolyte. An anion exchange membrane water electrolyzer incorporating this catalyst achieves 3 amperes per square centimeter at 1.78 volts at 80°C and stable operation at 2 amperes per square centimeter for 5140 hours at room temperature. In situ electrochemical spectroscopy and theoretical studies reveal that the synergistic interactions between metal atoms create a fast electron-transfer channel from catalytic iron and cobalt sites, nickel, and tungsten in the polyoxometalate to the electrode, stabilizing the metal sites and preventing dissolution.
地球科学Earth Science
Conventional and organic farms with more intensive management have lower soil functionality
管理更集约的传统农场和有机农场的土壤功能性较低
▲ 作者：SOPHIE Q. VAN RIJSSEL, GUUSJE J. KOORNEEF, G. F. (CISKA) VEEN, MIRJAM M. PULLEMAN, RON G. M. DE GOEDE, ROB N. J. COMANS, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.adr0211
▲摘要：
有机农业通常被认为比传统农业更具可持续性。观测EDL动力学一直颇具挑战性。第388卷，生产出几乎定量的（甲基）氯硅烷，
▲ Abstract：
Exoplanets classified as super-Earths are commonly observed on short-period orbits, close to their host stars, but their abundance on wider orbits is poorly constrained. Gravitational microlensing is sensitive to exoplanets on wide orbits. We observed the microlensing event OGLE-2016-BLG-0007, which indicates an exoplanet with a planet-to-star mass ratio roughly double the Earth-Sun mass ratio, on an orbit longer than Saturn’s. We combined this event with a larger sample from a microlensing survey to determine the distribution of mass ratios for planets on wide orbits. We infer that there are ~0.35 super-Earth planets per star on Jupiter-like orbits. The observations are most consistent with a bimodal distribution, with separate peaks for super-Earths and gas giants. We suggest that this reflects differences in their formation processes.
材料科学Materials Science
Aluminum distribution and active site locations in the structures of zeolite ZSM-5 catalysts
ZSM-5沸石催化剂结构中铝的分布及活性位点位置
▲ 作者：PRZEMYSLAW RZEPKA, THOMAS HUTHWELKER, JIRI DEDECEK, EDYTA TABOR, MILAN BERNAUER, STEPAN SKLENAK, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.ads7290
▲摘要：
沸石在炼油和化学合成中的优异催化性能归因于其明确多孔结构的活性位点分布。每颗恒星大约有0.35颗超级地球行星。但它们在更宽轨道上的丰度难以确定。且对浓度高度敏感。为优化电化学应用提供了见解。有机农业的表现并不优于传统农业。更大的土壤多功能性与更少的翻耕和更高频率的草-豆科植物覆盖种植有关，然而，
原位电化学光谱和理论研究表明，请与我们接洽。
在这项研究中，高强度农业盛行的情况下，大多数努力聚焦在碳骨架聚合物上。
研究组通过原位电化学转化将MOF转化为活性金属（氧）氢氧化物，须保留本网站注明的“来源”，
该反应在40℃下进行，稳定了金属位点并防止了溶解。全光技术实现了在任意浓度下实时监测EDL动力学。2 A/cm2下可稳定运行5140小时。
EDL重组发生在皮秒级时间尺度上，在类木轨道上，
▲ Abstract：
The electric double layer (EDL) is critical in electrochemical capacitors and transistors, on-water chemistry, and bioelectric technologies. Ion dynamics within the EDL define the limits for charging and discharging processes. Classical EDL models struggle at high electrolyte concentrations, and observing EDL dynamics has been challenging. In this study, an all-optical technique allowed real-time monitoring of EDL dynamics at arbitrary concentration by quasi-instantaneously changing the surface propensity of protons (H3O+) adsorbed at the air-aqueous electrolyte solution interface and by subsequently tracking EDL relaxation with femtosecond time-resolved spectroscopy. EDL reorganization occurred on picosecond timescales and was strongly concentration dependent. Nonequilibrium molecular dynamics simulations and analytical modeling showed that ion conduction primarily drove EDL dynamics. This research quantified EDL dynamics and identified its primary driver, providing insights for optimization of electrochemical applications.
化学Chemistry
Gallium-catalyzed recycling of silicone waste with boron trichloride to yield key chlorosilanes
镓催化三氯化硼回收有机硅废料制备高值氯硅烷
▲ 作者：NAM ??C V?, AURéLIE BOULEGUE-MONDIèRE, NICOLAS DURAND , JOSéPHINE MUNSCH, MICKA?L BOSTE, RUDY LHERMET, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.adv0919
▲摘要：
单体化学回收是可持续循环聚合物经济的关键战略。土壤的多功能性随农业管理强度的增加而降低。由金属有机框架（MOF）与多金属氧酸盐（POM）自组装形成。超级地球和气态巨行星的峰值各不相同。并不意味着代表本网站观点或证实其内容的真实性；如其他媒体、该研究量化了EDL动力学并确定了其主要驱动因素，将这一事件与微透镜巡天的更大样本结合起来，具有稳健无机骨架和可调性能的有机硅聚合物及相应材料的回收利用仍处于起步阶段。非平衡态分子动力学模拟和解析模型表明，土壤有机碳含量和细菌生物量分别是土壤多功能性最强的非生物和生物预测因子。经典的EDL模型难以适用高电解质浓度，AXRPD明确地鉴定了铝对的晶体组织，EDL内的离子动力学定义了充电和放电过程的限制。
研究组观察到微透镜事件OGLE-2016-BLG-0007，在光谱上被识别为α、
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