|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Restudy of the storage and migration model of the Quaternary groundwater in Beijing Plain area显示文摘Through a wide-spread groundwater sampling mainly at nested monitoring wells in the Beijing Plain area,combined with data collection,the study analyzes water level,hydrochemistry,temperature,tritium,deuterium,18O,14C and other aspects,and indicates that there exits an obvious stratification phenomenon of the groundwater in the alluvial plain area down in the middle part of alluvial-pluvial fans,and the hydraulic connection between layers is very weak.The analysis of the tritium concentration suggests that the average influence depth of the modern precipitation is approximately 120m.Based on the analysis of the 22 paleowater samples through the D18O method and 14C isotopic dating,the deep groundwater circulation in the fine sediments area of Beijing Plain down in the fringe part of alluvial-pluvial fans is relatively slow.On average the paleowater point occurs approximately below the 180m at these points.The main reasons for the formation of stratification and paleowater points are the water-blocking effect of the clay type strata and the compaction effect during the sedimentary process,especially the differential compaction,which could form closed or relatively closed stagnant aquifers.Groundwater in this kind of stagnant aquifers to some degree belongs to non-renewable resource,and should be reconsidered and re-arranged in the water resources management strategy. | LIU YuanZhang WU Qiang LIN Pei LIU JiuRong XING LiTing GAO ZhiHui | 2012 | Science China Earth Sciences2012，55，7： | 7 |
| 2 | Disorder in ball-milled graphite revealed by Raman spectroscopy显示文摘 | Tan Xing Lu Hua Li Liting Hou Xiaoping Hu Shaoxiong Zhou Robert Peter Mladen Petravic Ying Chen | 2013 | Carbon2013，，： | 1 |
| 3 | Disorder in ball- milled graphite revealed by Raman spectroscopy显示文摘 | Tan Xing Lu Hua Li Liting Hou | 2013 | Car- bon2013，57，： | 1 |
| 4 | Intrinsic spin shielding effect in platinum-rare-earth alloy boosts oxygen reduction activity显示文摘Oxygen reduction reactions(ORRs)involve a multistep proton-coupled electron process accompanied by the conversion of the apodictic spin configuration.Understanding the role of spin configurations of metals in the adsorption and desorption of oxygen intermediates during ORRs is critical for the design of efficient ORR catalysts.Herein,a platinum-rare-earth-metal-based alloy catalyst,Pt_(2)Gd,is introduced to reveal the role of spin configurations in the catalytic activity of materials.The catalyst exhibits a unique intrinsic spin reconfiguration because of interactions between the Gd-4f and Pt-5d orbitals.The adsorption and desorption of the oxygen species are optimized by modifying the spin symmetry and electronic structures of the material for increased ORR efficiency.The Pt_(2)Gd alloy exhibits a half-wave potential of 0.95 V and a superior mass activity of 1.5 A·mg Pt^(−1)in a 0.1 M HClO_(4)electrolyte,as well as higher durability than conventional Pt/C catalysts.Theoretical calculations have proven that the spin shielding effect of Gd pairs increases the spin symmetry of Pt-5d orbitals and adsorption preferences toward spin-polarized intermediates to facilitate ORR.This work clarifies the impact of modulating the intrinsic spin state of Pt through the interaction with the local high spin 4f orbital electrons in rare-earth metals,with the aim of boosting the spin-related oxygen reduction reaction,thus fundamentally contributing to the understanding of new descriptors that control ORR activity. | Siyuan Zhu Mingzi Sun Bingbao Mei Liting Yang Yuyi Chu Zhaoping Shi Jingsen Bai Xian Wang Zheng Jiang Changpeng Liu Bolong Huang Junjie Ge Wei Xing | 2023 | National Science Review2023，10，9： | 0 |
| 5 | Ultra-stable Pt_(5)La intermetallic compound towards highly efficient oxygen reduction reaction显示文摘Designing feasible electrocatalysts towards oxygen reduction reaction(ORR)requires advancement in both activity and stability,where attaining high stability is of extreme importance as the catalysts are expected to work efficiently under frequent start-up/shut down circumstances for at least several thousand hours.Alloying platinum with early transition metals(i.e.,Pt–La alloy)is revealed as efficient catalysts construction strategy to potentially satisfy these demands.Here we report a Pt5La intermetallic compound synthesized by a novel and facile strategy.Due to the strong electronic interactions between Pt and La,the resultant Pt5La alloy catalyst exhibits enhanced activity with half wave of 0.92 V and mass activity of 0.49 A·mgPt^(−1),which strictly follows the 4e transfer pathway.More importantly,the catalyst performs superior stability during 30,000 cycles of accelerated stressed test(AST)with mass activity retention of 93.9%.This study provides new opportunities for future applications of Pt-rare earth metal alloy with excellent electrocatalytic properties. | Siyuan Zhu Liting Yang Jingsen Bai Yuyi Chu Jie Liu Zhao Jin Changpeng Liu Junjie Ge Wei Xing | 2023 | Nano Research2023，16，2： | 0 |
| 6 | Investigation into Experimental Conditions and Factors for Cyclohexane Oxidation with VO(acac)2显示文摘 | MA Xitong XING Na WU Qiong XU Liting XING Yongheng | 2014 | Chemical Research in Chinese Universities2014，30，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员