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Defect and interface engineering for electrochemical nitrogen reduction reaction under ambient conditions

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Journal of Energy Chemistry 2022年第2期31卷 448-468页

作者： Dongxue Guo Shuo Wang Jun Xu wenjun zheng Danhong Wang TKL of Metal and Molecule Based Material Chemistry School of Materials Science and EngineeringCollege of ChemistryNankai UniversityTianjin 300350China Center for Rare Earth and Inorganic Functional Materials Tianjin Key Lab for Rare Earth Materials and ApplicationsNational Institute for Advanced MaterialsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China

Electrochemical nitrogen reduction reaction(e-NRR)under ambient conditions is an emerging strategy to tackle the hydrogen-and energy-intensive operations for traditional Haber-Bosch process in industrial ammonia(NH_(3))***,the e-NRR performance is currently impeded by the inherent inertness of N_(2) molecules,the extremely slow kinetics and the overwhelming competition from the hydrogen evolution reaction(HER),all of which cause unsatisfied yield and ammonia selectivity(Faradaic efficiency,FE).Defect and interface engineering are capable of achieving novel physical and chemical properties as well as superior synergistic effects for various *** this review,we first provide a general introduction to the NRR *** then focus on the recent progress in defect and interface engineering and summarize how defect and interface can be rationally designed and functioned in NRR ***,the origin of superior NRR catalytic activity by applying these approaches was discussed from both theoretical and experimental ***,the remaining challenges and future perspectives in this emerging area are *** is expected that this review will shed some light on designing NRR electrocatalysts with excellent activity,selectivity and stability.

关键词： Nitrogen reduction Electrocatalysis Defect engineering Interface engineering Ambient conditions

Fabrication of ZnO nanorods in ionic liquids and their photoluminescent properties

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Science China Chemistry 2007年第2期50卷 224-229页

作者： WANG Li ZHAO Bin CHANG LiXian zheng wenjun College of Chemistry Nankai UniversityTianjin 300071China

A novel and simple approach is reported to fabricate uniform single-crystal ZnO nanorods in ionic liq-uids. The as-obtained ZnO nanorods have been characterized by XRD,TEM,HRTEM,SAED,XPS,EDXA,PL and UV-vis absorption spectra. The rod diameters of the nanostructures can be controlled by tuning the amount of sodium hydroxide in the synthesis. Photoluminescence results show that the nanos-tructural ZnO exhibits better optical properties than bulk ZnO does and interestingly,the smaller the rod diameters are,the better optical property 1D nanostructural ZnO exhibits. The possible growth mechanism of ZnO nanorods is also investigated.

关键词： zinc oxide nanorods low-heating solid-state route ionic liquids

Drainage Responses to the Activity of the Langshan Range-Front Fault and Tectonic Implications

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Journal of Earth Science 2018年第1期29卷 193-209页

作者： Shaopeng Dong Peizhen Zhang Huiping Zhang wenjun zheng Huixian Chen Key Laboratory of Active Tectonics and Volcano Institute of Geology China Earthquake Administration Beijing 100029 China State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China School of Earth Science and Geological Engineering Sun Yan-Sen University Cruangzhou 510275 China Map Supervision Center of SBSM Beijing 100830 China

Langshan, a monoclinic mountain, which started to uplift since Oligocene, bounds the northwest margin of the Hetao Basin. The continuous activity of the active normal Langshan range- front fault forms the typical basin-and-range landform in Langshan area and controls the landform evolution of Langshan. Langshan is an ideal place to study relationship between quantitative geomor- phological index and active deformation. According to study on knickpoints, fitting on longitudinal channel profiles and steepness index, we demonstrate that the main controlling factors on distribution of normalized steepness index of channels are not climate （precipitation）, lithology, sediment flux, but tectonic factor, or the activity of Langshan range-front fault. The short channels in southeast flank, whose lengths are shorter than 16 km, may be still in the non-steady status. If not considering these short channels, the distribution of normalized steepness index along the Langshan range-front fault appears like M-shape pattern, while the normalized steepness index in the middle section is higher than those at both ends. This pattern is well consistent with geometrical segmentation model of the Langshan range-front fault. Combining previous active tectonic research on Langshan range-front fault, which demonstrates the Langshan range-front fault has been in the stage of linkup, we reasonably infer the Langshan range-front fault now is the result of linkup of both fault which continuously bilaterally ex- tended independently. Our tectonic geomorphological study also supports the conclusion that the Langshan range-front fault has been in the stage of linkup. The formation of several knickpoints due to tectonic factor may have been caused by slip-rate variation because of linkup of both independent faults. Based on cognition above, we also proposed the geological and geomorphological evolutionary model of the Langshan range-front fault since Oligocene.

关键词： Langshan range-front fault Hetao Basin steepness index Langshan geomorphological evolutionary model.

The effect of altimetry data in estimating the elastic thickness of the lithosphere in the western Pacific Ocean

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Geodesy and Geodynamics 2021年第5期12卷 315-322页

作者： zheng Gong Peizhen Zhang wenjun zheng Dongli Zhang Binbin Xu Guangdong Provincial Key Laboratory of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat-Sen UniversityGuangzhou510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082China

The elastic thickness of the lithosphere(Te)is a key parameter used to describe the strength of the *** is usually estimated by a spectral analysis between gravity and *** previous research on the estimation of Te,altimetry data were used on both the gravity data and topography data,which could lead to *** study described in this paper analyzed the effects of using gravity anomalies derived from different data sources on the estimation of Te,Taking the western Pacific region as an example,this study analyzed the impact of the repeated presence of altimetry satellite data on the calculation of the effective elastic thickness and found that if gravity anomalies and topography model both contain altimetry satellite data,they systematically overestimate effective *** a uniform area,the difference in Te can reach up to 30%.For a Te distribution,the difference can reach up to about16%.After eliminating this effect,the effective elastic thickness of the western Pacific region was found to be 10 km,and the statistical results of the effective elastic thickness distribution showed that the effective elastic thickness of the lithosphere in most areas of the western Pacific is about 12 *** paper shows the importance of choosing the appropriate gravity model in evaluating the elastic thickness of lithosphere in the oceans.A figure of Te at seamounts with loading ages demonstrates that Te in the western Pacific is generally distributed within the 100-300℃isotherm depth and does not increase with loading age.

关键词： The elastic thickness of lithosphere The western Pacific Ocean Altimetry data Spectral analysis

Dextral strike-slip of Sanguankou-Niushoushan fault zone and extension of arc tectonic belt in the northeastern margin of the Tibet Plateau

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Science China Earth Sciences 2016年第5期59卷 1025-1040页

作者： LEI QiYun ZHANG PeiZhen zheng wenjun CHAI ChiZhang WANG WeiTao DU Peng YU JingXing State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China Earthquake Administration of Ningxia Hui Autonomous Region Yinchuan 750001 China

The kinematic characteristics of the Sanguankou-Niushoushan fault（SGK-NSSF） are of great significance to the understanding of the extension of the arc tectonic belt in the northeastern margin of the Tibet Plateau. Using field surveys and various data collection methods, including large-scale geological mapping, measurement of typical topographies, and dating of sedimentary strata, it was determined that the SGK-NSSF exhibits obvious dextral strike-slip characteristics and thus is not a sinistral strike-slip fault, as believed by previous researchers. The results of this study show that the geological boundaries for the Paleozoic, Mesozoic, and Cenozoic eras were all dextrally dislocated by the fault, with the faulted displacements being similar. The maximum strike-slip displacement of the fault, after elimination of topographic effects, was found to be 961±6 m. The Sanguankou fault at the northern section exhibits obvious characteristics of more recent activities, with a series of small gullies having undergone synchronized dextral writhing after traversing the fault. The average horizontal slip rate of the fault since the late Quaternary was determined to be approximately 0.35 mm/a. The pre-existing fold structures formed during the late Pliocene were dislocated by the fault and became ex situ, indicating that dextral strike-slip of the fault could not have occurred prior to the late Pliocene. The maximum displacements and average slip rates were used to estimate the onset time of the dextral strike-slip activities of the fault as being after 2.7 Ma. In this study, the understanding of previous researchers concerning the extension in the northeastern margin of the Tibet Plateau was combined with analyses of the successive relationships between fold deformations and fault activities. This led to the finding that the extension in the northeastern margin of the Tibet Plateau reached the vicinity of the SGK-NSSF during the late Pliocene（~2.7 Ma）, causing regional uplif

关键词： Northeastern margin of Tibet Plateau Sanguankou-Niushoushan fault Dextral strike-slip Tectonic interactions between blocks Arc tectonic belt

Syntheses of CuO nanostructures in ionic liquids

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Science China Chemistry 2007年第1期50卷 63-69页

作者： WANG Li ZHAO Bin YUAN ZhongYong ZHANG XueJun Wu QingDuan CHANG LiXian zheng wenjun College of Chemistry Nankai UniversityTianjin 300071China

A simple and efficient approach is developed to fabricate single-crystalline CuO nanostructures through an ionic liquid assisted one-step low-temperature solid-state *** nanoparticles(5 nm in size)and nanorods(5-10 nm in diameter and 50-100 nm in length)of monoclinic CuO were obtained. These synthesized CuO nanostructures were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),selected area electron diffraction(SAED),X-ray photoelectron spectros- copy(XPS),energy dispersive spectroscopy(EDS)and nitrogen adsorption *** morpholo- gies of the nanostructures can be controlled by tuning the amount of NaOH and ionic *** growth mechanism of CuO nanostructures is investigated.

关键词： CuO nanostructures ionic liquids low-temperature solid-state route

A novel photonic crystal vertical cavity surface emitting laser based on coherent coupling

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Chinese Science Bulletin 2010年第2期55卷 111-113页

作者： LIU AnJin QU HongWei XING MingXin CHEN Wei ZHOU wenjun zheng WanHua Nano-Optoelectronics Laboratory Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

We demonstrate a novel oxide confined GaAs-based photonic crystal vertical cavity surface emitting laser (PC-VCSEL) operating at a wavelength of 850 nm based on coherent coupling. A ring-shaped light-emitting aperture is added to the conventional PC-VCSEL, and coherent coupling is achieved between the central defect aperture and the ring-shaped light-emitting aperture. Measurements show that under the continuous-wave (CW) injected current of 20 mA, a high power of 2 mW is obtained, and the side mode suppression ratio (SMSR) is larger than 20 dB. The average divergence angle is 4.2° at the current level of 20 mA. Compared with the results ever reported, the divergence angle is reduced.

关键词：垂直腔表面发射激光器相干耦合光子晶体 VCSEL 个人电脑 GaAs 发散角氧化物

Late Quaternary Slip Behavior of the Jinqianghe Fault in the Middle Qilian-Haiyuan Fault Zone,Northeastern Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 825-843页

作者： LIANG Shumin zheng wenjun CHEN Gan ZHANG Peizhen ZHANG Dongli BI Haiyun YANG Xue ZHANG Yipeng DUAN Lei LU Bentian Guangdong Provincial Key Laboratory of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat–sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiGuangdong 519082China State Key Laboratory for Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China

The Qilian-Haiyuan fault zone in the northeastern Tibetan Plateau has been the source of strong earthquakes in the *** its middle segment,the Jinqianghe fault is an important active fault within the Tianzhu seismic gap;however,little is known about its slip *** present a new horizontal displacement distribution along this fault,we used WorldView-2 stereo pairs and unmanned aerial vehicle-based photogrammetry to construct digital elevation models to obtain a detailed tectono-geomorphic interpretation and geomorphic *** offset marker measurements yielded 135 geomorphic displacements and 8 offset *** dating was used to establish the regional age sequence of the geomorphic units in offset fluvial terraces at four study *** displacements and ages linked the offset clusters with the geomorphic unit sequence;the Holocene strike-slip rate of the Jinqianghe fault was estimated to 4.8-5.6 mm/a at~4-12 ka and 2.9-4.7 mm/a from~4 *** recent earthquakes(with a recurrence interval of~1000 years)represent an active seismic period,revealing the potential seismic hazard along this fault because it has not ruptured in the last 1500 years.

关键词： remote sensing offset geomorphology cumulative offset distribution Qilian-Haiyuan fault zone

Enhancing the Intermolecular Interactions of Ladder-Type Heteroheptacene-Based Nonfullerene Acceptors for Efficient Polymer Solar Cells by Incorporating Asymmetric Side Chains

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CCS Chemistry 2023年第2期5卷 455-468页

作者： Qisheng Tu wenjun zheng Yunlong Ma Ming Zhang Zhijian Li Dongdong Cai Pan Yin Jinyun Wang Shan-Ci Chen Feng Liu Qingdong zheng State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002 University of Chinese Academy of Sciences Beijing 100049 Frontiers Science Center for Transformative Molecules and In-Situ Center for Physical Scienceand the Center of Hydrogen ScienceSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240

Asymmetric nonfullerene acceptors(NFAs)possess larger dipole moments and stronger intermolecular bonding energy than their symmetric counterparts thereby making them promising candidates for high-performance polymer solar cells(PSCs).Herein,we report twoefficient acceptor–donor–acceptor(A–D–A)type NFAs(M14 and M18)with asymmetric side chains that show enhanced intermolecular interactions compared with their corresponding counterparts(M17 and M19)based on symmetric side ***,M14 and M18 exhibit elevated lowest unoccupiedmolecular orbitals and smallerπ–πstacking distances in comparison with M17 and M19,*** combination with the benchmark polymer donor of PM6,the PM6:M14 blend affords superior charge transport properties,and more importantly,an increased power conversion efficiency(PCE)of 15.49%in comparison with the M17-based counterpart(13.01%PCE).Similarly,the asymmetric M18-based blend also shows a higher PCE of 13.00%than the M19-based blend(11.55%).Through further interface engineering,the bestperforming M14-based device delivers an enhanced PCE of 16.46%,which represents a record value among all asymmetric A–D–A type *** results provide new insights into the design of asymmetric NFAs with enhanced intermolecular interactions for highperformance PSCs.

关键词： heteroheptacene nonfullerene acceptors asymmetric side chains intermolecular interactions polymer solar cells