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Highly stable side-chain-type cardo poly(aryl ether ketone)s membranes for vanadium flow battery

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Chinese Chemical Letters 2024年第3期35卷 167-170页

作者： Ziming Zhao Qing Dai Sihan Huang Wenjing Lu Yaohan chen Jifu Zheng Suobo zhang Shenghai Li xianfeng Li Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Division of Energy Storage Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Vanadium flow batteries(VFBs)have drawn considerable attention as an emerging technology for largescale energy storage systems(ESSs).One of the pivotal challenges is the availability of eligible ion exchange membranes(ICMs)that provide high ion selectivity,proton conductivity,and stability under rigorous ***,a‘side-chain-type’strategy has been employed to fabricate highly stable phenolphthalein-based cardo poly(arylene ether ketone)s(PAEKs)membrane with low area resistance(0.058Ωcm^(2)),in which flexible alkyl spacers effectively alleviated inductive withdrawing effect from terminal ion exchange groups thus enabling a stable *** assembled VFBs based on PAEKs bearing pendent alkyl chain terminated with quaternary ammonium(Q-PPhEK)demonstrated an energy efficiency above 80%over 700 cycles at 160 ma/cm^(2).Such a remarkable results revealed that the side-chain-type strategy contributed to enhancing the ICMs stability in strong oxidizing environment,meanwhile,more interesting backbones would be woken with this design engaging in stable ICMs for VFBs.

关键词： Vanadium flow battery Energy storage technology Ion exchange membrane Ion transport mechanism Poly(arylene ether ketone)s(PAEKs)

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THERMODYNAMIC FORmaLISM FOR SUBADDITIVE SEQUENCE OF DISCONTINUOUS FUNCTIONS

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Analysis in Theory and Applications 2010年第2期26卷 174-185页

作者： xianfeng ma (Nanjing Normal university/east china university of science and technology, china) ercai chen (Nanjing Normal university/Nanjing university, china) Yu Pei (Nanjing Normal university, china) 1. School of mathematics and Computer science Nanjing Normal Uniersity Nanjing 210097 P. R. China2. Department of Mathematics East China University of Science and Technology Shanghai 200237 P. R. China3. Center of Nonlinear Science Nanjing University Nanjing 210093 P. R. China

The topological pressure for subadditive sequence of discontinuous functions is defined on any invariant subset having a nested family of subsets in the compact metric space. Two subadditive variational principles associated with two different relatively weak conditions are developed for the defined topological pressure. As an application, we give an example on systems with nonzero Lyapunov exponents.

关键词： thermodynamic formalism variational principle topological pressure subadditive sequence of functions

Selective CO_(2)-to-formic acid electrochemical conversion by modulating electronic environment of copper phthalocyanine with defective graphene

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Chinese Journal of Structural Chemistry 2023年第10期42卷 4-12页

作者： Hanqing zhang Xiaoxia Wang chen chen xianfeng Yang Chungli Dong Yucheng Huang Xiaoliang Zhao Dongjiang Yang School of Environmental science and Engineering State Key Laboratory of Bio-fibers and Eco-textilesShandong Collaborative Innovation Center of Marine Bio-based Fibers and Ecological TextilesQingdao UniversityQingdao266071China Analytical and Testing Centre South China University of TechnologyGuangzhou510640China Research Center for X-ray science Department of PhysicsTamkang UniversityTamsui25137TaiwanChina

In the carbon dioxide reduction reaction(CO_(2)RR),the activity of transition metal center depends largely on its electronic structure,since the electronic rich region enhances the adsorption of intermediates at active sites,thus improving the selectivity to reduction *** this work,we prepared CuPc/DG composite(CuPc:copper phthalocyanine;DG:defective graphene)to achieve selective CO_(2)-to-formic acid(HCOOH)electrochemical conversion through modulating the electronic structure of Cu active centers with DG via π-π *** as the electrocatalyst,the CuPc/DG composite displays a high faradaic efficiency(FE)of 44.6%−0.78 V *** for CO_(2)RR to *** current density is 5.28 ma cm^(−2) for HCOOH together with an exceptional stability throughout at least 20 h of *** the basis of density functional theory(DFT)calculation results,defects in DG can effectively promote the charge redistribution of dispersed CuPc,where electrons transfer to CuPc from defects,forming rich electronic environment around Cu *** abundance of electrons makes the d-band center of Cu approach to the Fermi level and decrease the energy barrier of CuPc/DG composite for the intermediate of ∗OCHO,thus accelerating the reduction of CO_(2) to HCOOH.

关键词： CO_(2)RR CuPc/DG composite Electron-rich region on Cu atoms HCOOH selectivity DFT calculations

氮磷钾配施生物有机肥对旱作农业区玉米产量和品质的影响

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山东农业大学学报（自然科学版） 2021年第6期52卷 903-910页

作者：陈鑫张杰刘燕燕武才女马亚君高芳芳王琨山西师范大学现代文理学院山西临汾041000 山西师范大学生命科学学院山西临汾041000 神池县科技服务中心山西忻州036100 国家微生物肥料技术研究推广中心第24号技术推广站山西临汾041000

为了探究增施生物有机肥对玉米产量和品质的影响,为旱区玉米的种植提供科学的施肥方案。以先锋6号玉米为试验材料,通过2018-2021年连续四年定位试验,研究在复合肥的基础上合理增施生物有机肥对玉米的产量、品质及经济效益的影响。结果表... 详细信息

为了探究增施生物有机肥对玉米产量和品质的影响,为旱区玉米的种植提供科学的施肥方案。以先锋6号玉米为试验材料,通过2018-2021年连续四年定位试验,研究在复合肥的基础上合理增施生物有机肥对玉米的产量、品质及经济效益的影响。结果表明,2018年和2019年的各试验组中T3组效果最好,其中土壤养分中有机质、全氮、速效磷、速效钾等指标较试验前分别增加了124.40%、56.40%、119.10%、39%和94%、64.10%、123.80%、44.90%;产量分别增加了13.70%和14.20%;淀粉、蛋白质和脂肪含量分别增加了2.81%、2.95%、13.17%、8.32%和8.08%、8.23%;总产值分别为29095.56元/hm^(2)和29651.04元/hm^(2),扣除玉米种子、肥料等,净利润最大的均为T2组,产量分别为11979.75 kg/hm^(2)和12152.15 kg/hm^(2),较CK组增加了12.40%和12.20%,总产值分别为28751.4元/hm^(2)和29165.16元/hm^(2)。2020年、2021年我们选择经济效益最高的T2组进行扩大面积示范种植进行验证,产量分别为13307.21 kg/hm^(2)和13433.37 kg/hm^(2),较CK组分别提高了33.43%和33.60%;净利润为27407.30元/hm^(2)和27710.10元/hm^(2),较CK组分别提高了31%和31.31%。结合玉米产量、农民纯收入等方面考虑施用复合肥600 kg/hm^(2),生物有机肥1200 kg/hm^(2)的T2组是最佳施肥方式,适宜大面积推广种植,同时为旱区玉米种植施肥习惯做出理论性指导。

关键词：混合肥玉米产量品质

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