服务粉丝

我们一直在努力
当前位置:首页 > 财经 >

新文速递:10.6-10.20

日期: 来源:NatMater资讯收集编辑:Nature Materials

金属-有机框架中交换控制的三重态聚变

Triplet-fusion-based photon upconversion is promising for photovoltaic or bioimaging applications, but its efficiency is limited by triplet fusion spin dependence. Here, the authors tailor spin dynamics by engineering the crystal structure with metal–organic frameworks to enable effective spin mixing between singlet and quintet triplet–triplet pair states.


Exchange controlled triplet fusion in metal–organic frameworks
Triplet-fusion-based photon upconversion holds promise for a wide range of applications, from photovoltaics to bioimaging. The efficiency of triplet fusion, however, is fundamentally limited in conventional molecular and polymeric systems by its spin dependence. Here, we show that the inherent tailorability of metal–organic frameworks (MOFs), combined with their highly porous but ordered structure, minimizes intertriplet exchange coupling and engineers effective spin mixing between singlet and quintet triplet–triplet pair states. We demonstrate singlet–quintet coupling in a pyrene-based MOF, NU-1000. An anomalous magnetic field effect is observed from NU-1000 corresponding to an induced resonance between singlet and quintet states that yields an increased fusion rate at room temperature under a relatively low applied magnetic field of 0.14 T. Our results suggest that MOFs offer particular promise for engineering the spin dynamics of multiexcitonic processes and improving their upconversion performance.

Spin dynamics of the triplet fusion process and a strategy for enabling singlet–quintet (SQ) coupling.

Dong-Gwang Ha, Ruomeng Wan, Changhae Andrew Kim, Ting-An Lin, Luming Yang, Troy Van Voorhis, Marc A. Baldo & Mircea Dincă 

doi: 10.1038/s41563-022-01368-1
Article


机器学习方法预测纳米多孔材料热容量

Heat capacity of nanoporous materials is important for processes such as carbon capture, as this can affect process design energy requirements. Here, a machine learning approach for heat capacity prediction, trained on density functional theory simulations, is presented and experimentally verified.


A data-science approach to predict the heat capacity of nanoporous materials
The heat capacity of a material is a fundamental property of great practical importance. For example, in a carbon capture process, the heat required to regenerate a solid sorbent is directly related to the heat capacity of the material. However, for most materials suitable for carbon capture applications, the heat capacity is not known, and thus the standard procedure is to assume the same value for all materials. In this work, we developed a machine learning approach, trained on density functional theory simulations, to accurately predict the heat capacity of these materials, that is, zeolites, metal–organic frameworks and covalent–organic frameworks. The accuracy of our prediction is confirmed with experimental data. Finally, for a temperature swing adsorption process that captures carbon from the flue gas of a coal-fired power plant, we show that for some materials, the heat requirement is reduced by as much as a factor of two using the correct heat capacity.


Structure/heat-capacity relationships.


Seyed Mohamad Moosavi, Balázs Álmos Novotny, Daniele Ongari, Elias Moubarak, Mehrdad Asgari, Özge Kadioglu, Charithea Charalambous, Andres Ortega-Guerrero, Amir H. Farmahini, Lev Sarkisov, Susana Garcia, Frank Noé & Berend Smit 

doi: 10.1038/s41563-022-01374-3
Article


用于质子交换膜水电解中稳定酸性析氧反应的非铱基电催化剂

Iridium-based electrocatalysts are traditional anode catalysts for proton exchange membrane water electrolysis but suffer from high cost and low reserves. An alternative, nickel-stabilized ruthenium dioxide catalyst with high activity and durability in acidic oxygen evolution reaction for water electrolysis is reported.


Non-iridium-based electrocatalyst for durable acidic oxygen evolution reaction in proton exchange membrane water electrolysis
Iridium-based electrocatalysts remain the only practical anode catalysts for proton exchange membrane (PEM) water electrolysis, due to their excellent stability under acidic oxygen evolution reaction (OER), but are greatly limited by their high cost and low reserves. Here, we report a nickel-stabilized, ruthenium dioxide (Ni-RuO2) catalyst, a promising alternative to iridium, with high activity and durability in acidic OER for PEM water electrolysis. While pristine RuO2 showed poor acidic OER stability and degraded within a short period of continuous operation, the incorporation of Ni greatly stabilized the RuO2 lattice and extended its durability by more than one order of magnitude. When applied to the anode of a PEM water electrolyser, our Ni-RuO2 catalyst demonstrated >1,000 h stability under a water-splitting current of 200 mA cm−2, suggesting potential for practical applications. Density functional theory studies, coupled with operando differential electrochemical mass spectroscopy analysis, confirmed the adsorbate-evolving mechanism on Ni-RuO2, as well as the critical role of Ni dopants in stabilization of surface Ru and subsurface oxygen for improved OER durability.

Acidic OER performance on RDE.


Zhen-Yu Wu, Feng-Yang Chen, Boyang Li, Shen-Wei Yu, Y. Zou Finfrock, Debora Motta Meira, Qiang-Qiang Yan, Peng Zhu, Ming-Xi Chen, Tian-Wei Song, Zhouyang Yin, Hai-Wei Liang, Sen Zhang, Guofeng Wang & Haotian Wang 

doi: 10.1038/s41563-022-01380-5
Article




长按扫描二维码,关注Nature Materials公众号



相关阅读

  • 新文速递 - 9.22/9.29

  • 纳米粒子修饰的微型机器人用于治疗急性细菌性肺炎的体内抗生素递送Biohybrid microrobots consisting of nanoparticle-modified microalgae are constructed for active dr
  • 新文速递:11.3/11.10

  • 模仿松果吸湿几何变形的不可感知运动The ultra-slow reshaping of pine cones is dominated by the unique spring/square heterostructure in their vascular bundles, wit
  • 新文速递: 11.17/11.21

  • 钴基蜂窝状磁体 BaCo2(AsO4)2 中的磁连续体The authors present time-domain terahertz spectroscopy measurements on BaCo2(AsO4)2, a promising 3d transition-metal-bas
  • 新文速递:11.28-12.2

  • 基于二甲基铵阳离子添加剂的中间相工程用于稳定钙钛矿太阳能电池The stability of halide perovskite solar cells, determined by film morphology, is paramount to their
  • 新文速递:12.8

  • 粒状铝纳米结Fluxonium量子比特The authors fabricate a fluxonium circuit using a granular aluminium nanoconstriction to replace the conventional superconductor–i
  • 瓶颈期该如何突破?

  • 点击蓝字 关注宇哥距考研还有13DAY加油,稳住,一切都来得及,加油!宇哥说上岸吧 苗子们宇哥每日一聊就要来啦!考前难点答疑、考前提醒、宇哥暖心祝福孩子们,记得来看!!!【冲刺月每日一
  • 每日一聊:第一天的陪伴

  • 点击蓝字 关注宇哥距考研还有12DAY加油,稳住,一切都来得及,加油!宇哥说上岸吧 苗子们2023考研每日一聊(第一天的陪伴):今天开始,每天几分钟,聊一聊重点,给大家做考前提示,算是对各位最

热门文章

  • “复活”半年后 京东拍拍二手杀入公益事业

  • 京东拍拍二手“复活”半年后,杀入公益事业,试图让企业捐的赠品、家庭闲置品变成实实在在的“爱心”。 把“闲置品”变爱心 6月12日,“益心一益·守护梦想每一步”2018年四

最新文章

  • 新文速递:10.6-10.20

  • 金属-有机框架中交换控制的三重态聚变Triplet-fusion-based photon upconversion is promising for photovoltaic or bioimaging applications, but its efficiency is limi
  • 新文速递 - 9.22/9.29

  • 纳米粒子修饰的微型机器人用于治疗急性细菌性肺炎的体内抗生素递送Biohybrid microrobots consisting of nanoparticle-modified microalgae are constructed for active dr
  • 新文速递:11.3/11.10

  • 模仿松果吸湿几何变形的不可感知运动The ultra-slow reshaping of pine cones is dominated by the unique spring/square heterostructure in their vascular bundles, wit
  • 新文速递: 11.17/11.21

  • 钴基蜂窝状磁体 BaCo2(AsO4)2 中的磁连续体The authors present time-domain terahertz spectroscopy measurements on BaCo2(AsO4)2, a promising 3d transition-metal-bas
  • 新文速递:11.28-12.2

  • 基于二甲基铵阳离子添加剂的中间相工程用于稳定钙钛矿太阳能电池The stability of halide perovskite solar cells, determined by film morphology, is paramount to their