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| 1 | Resolving rupture processes of great earthquakes: Reviews and perspective from fast response to joint inversion显示文摘Resolving rupture processes of great earthquakes has fundamental importance to the study of earthquake physics,rupture dynamics, fault zone structure, and evolving processes. It also plays an essential role in earthquake hazard estimation,emergency response and seismic hazard mitigation. This paper reviews the major progress of the earthquake rupture process studies in the last decades, with an emphasize on the research directions of the department geophysics of Peking University including real-time response, back-projection techniques, geodetic data analysis, joint inversion and inversion in complex earth medium. We discussed the advantages and limitations of tradition methods;proposed a systematic and integrated approach from fast-response to detailed study. We also raised perspectives of using source models for ground motion prediction and the possibility of full-dynamic inversion. | Han YUE Yong ZHANG Zengxi GE Teng WANG Li ZHAO | 2020 | Science China Earth Sciences2020，63，4： | 11 |
| 2 | Growth of SnO_2 Nanoflowers on N-doped Carbon Nanofibers as Anode for Li-and Na-ion Batteries显示文摘It is urgent to solve the problems of the dramatic volume expansion and pulverization of SnO_2 anodes during cycling process in battery systems. To address this issue, we design a hybrid structure of N-doped carbon fibers@SnO_2 nanoflowers(NC@SnO_2) to overcome it in this work. The hybrid NC@SnO_2 is synthesized through the hydrothermal growth of SnO_2 nanoflowers on the surface of N-doped carbon fibers obtained by electrospinning. The NC is introduced not only to provide a support framework in guiding the growth of the SnO_2 nanoflowers and prevent the flower-like structures from agglomeration, but also serve as a conductive network to accelerate electronic transmission along one-dimensional structure effectively. When the hybrid NC@SnO_2 was served as anode, it exhibits a high discharge capacity of 750 Ah g^(-1) at 1 A g^(-1) after 100 cycles in Li-ion battery and 270 mAh g^(-1) at 100 mA g^(-1) for 100 cycles in Na-ion battery, respectively. | Jiaojiao Liang Chaochun Yuan Huanhuan Li Kai Fan Zengxi Wei Hanqi Sun Jianmin Ma | 2018 | Nano-Micro Letters2018，10，2： | 10 |
| 3 | Molybdenum and tungsten chalcogenides for lithium/sodium-ion batteries: Beyond MoS2显示文摘Molybdenum and tungsten chalcogenides have attracted tremendous attention in energy storage and conversion due to their outstanding physicochemical and electrochemical properties.There are intensive studies on molybdenum and tungsten chalcogenides for energy storage and conversion,however,there is no systematic review on the applications of WS2,Mo Se2and WSe2as anode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs),except Mo S2.Considering the importance of these contents,it is extremely necessary to overview the recent development of novel layered WS2,Mo Se2and WSe2beyond Mo S2in energy storage.Here,we will systematically overview the recent progress of WS2,Mo Se2and WSe2as anode materials in LIBs and SIBs.This review will also discuss the opportunities,and perspectives of these materials in the energy storage fields. | Junda Huang Zengxi Wei Jiaqin Liao Wei Ni Caiyun Wang Jianmin Ma | 2019 | Journal of Energy Chemistry2019，28，6： | 7 |
| 4 | Boosting the rate capability of multichannel porous TiCh nanofibers with well-dispersed Cu nanodots and Cu^2+-doping derived oxygen vacancies for sodium-ion batteries显示文摘The use of TiO2 as an anode in rechargeable sodium-ion batteries(NIBs)is hampered by intrinsic low electronic conductivity of TiO2 and in ferior electrode kinetics.Here,a high-performa nee T1O2 electrode for NIBs is prese nted by desig ning a multicha rinel porous T1O2 nano fibers with well-dispersed Cu nan odots and Cu^2+-doping derived oxyge n vaca ncies(Cu-MPTO).The in-situ grow n well-dispersed copper nano dots of about 3 nm on TiO2 surface could significantly enhance electronic conductivity of the TiO2 fibers.The one-dimensional multichannel porous structure could facilitate the electrolyte to soak in,leadi ng to short tran sport path of Na^+through carb on toward the TiO2 nano particle.The Cu^2+-doping induced oxygen vacancies could decrease the bandgap of T1O2,resulting in easy electron trapping.With this strategy,the Cu-MPTO electrodes render an outstanding rate performance for NIBs(120 mAh·g^-1 at 20 C)and a superior cycling stability for ultralong cycle life(120 mAh·g^-1 at 20 C and 96.5%retention over 2,000 cycles).Density functional theory(DFT)calculations also suggest that Cu^2+doping can enhance the conductivity and electron transfer of T1O2 and lower the sodiation energy barrier.This strategy is confirmed to be a general process and could be extended to improve the performance of other materials with low electronic conductivity applied in energy storage systems. | Ying Wu Zengxi Wei Rui Xu Yue Gong Lin Gu Jianmin Ma Yan Yu | 2019 | Nano Research2019，12，9： | 5 |
| 5 | 2020 roadmap on pore materials for energy and environmental applications显示文摘Porous materials have attracted great attention in energy and environment applications,such as metal organic frameworks(MOFs),metal aerogels,carbon aerogels,porous metal oxides.These materials could be also hybridized with other materials into functional composites with superior properties.The high specific area of porous materials offer them the advantage as hosts to conduct catalytic and electrochemical reactions.On one hand,catalytic reactions include photocatalytic,p ho toe lectrocatalytic and electrocatalytic reactions over some gases.On the other hand,they can be used as electrodes in various batteries,such as alkaline metal ion batteries and electrochemical capacitors.So far,both catalysis and batteries are extremely attractive topics.There are also many obstacles to overcome in the exploration of these porous materials.The research related to porous materials for energy and environment applications is at extremely active stage,and this has motivated us to contribute with a roadmap on ’porous materials for energy and environment applications’. | Zengxi Wei Bing Ding Hui Dou Jorge Gascon Xiang-Jian Kong Yujie Xiong Bin Cai Ruiyang Zhang Ying Zhou Mingce Long Jie Miao Yuhai Dou Ding Yuan Jianmin Ma | 2019 | Chinese Chemical Letters2019，30，12： | 5 |
| 6 | In-situ generated ionic liquid catalyzed aldol condensation of trioxane with ester in mild homogeneous system显示文摘α, β-unsaturated esters were often synthesized from aldehydes and esters in the presence of strong organic base that was very sensitive to air and moisture via aldol reaction. Trioxane was very useful C1 resource, however, the decomposition of it was always the challenging problem that facing researchers. Herein, a novel synthetic methodology for α, β-unsaturated ester preparation from trioxane and ester with mild catalysis of generated ammonium trifluoromethanesulfonate ionic liquid. The enolization of ester as well as the decomposition of trioxane could proceed easily in the presence of boryl trifluoromethanesulfonate and amine at 20–25℃. Then the enolate and decomposed formaldehyde occurs aldol reaction to form α, β-unsaturated ester. With this strategy, the yield and selectivity of product from various substrates including aliphatic esters,lactones and thioester could reach up to 85.2% and 90.1%. | Gang Wang Zengxi Li Chunshan Li Suojiang Zhang | 2019 | Green Energy & Environment2019，4，3： | 4 |
| 7 | Simulation of the seismic response of sedimentary basins with constant-gradient velocity along arbitrary direction using boundary element method:SH case显示文摘We presented a boundary element method using the approximate analytical Green's function given by Sánchez-Sesma et al.Coordinate transform is introduced to extend the method to deal with the model with constant-gradient velocity along oblique direction.The method is validated by comparing the numerical results with other independent methods.This method provides a useful tool for analyzing local site effects.We computed seismic response for two series of models.The results in both frequency and time domains are analyzed and show complex amplification patterns.The fundamental mode of resonance is dependent not only on the velocity at the free surface but also on the velocity distribution of the whole basin.For the higher modes of vibration the heterogeneous basin also has its own characteristic. | Zengxi Ge | 2010 | Earthquake Science2010，23，2： | 4 |
| 8 | Defective ZnS nanoparticles anchored in situ on N-doped carbon as a superior oxygen reduction reaction catalyst显示文摘Defect engineering has been used to develop low-cost and effective catalysts to boost oxygen reduction reactions.However,the development of catalysts that use metal cation vacancies as the active sites for oxygen reduction reaction is lacking.In this study,ZnS nanoparticles on N-doped carbon serve as an oxygen reduction reaction catalyst.These catalysts were prepared via a one-step method at 900℃.Amazingly,the high-resolution transmission electron microscope image revealed obvious defects in the ZnS nanoparticles.These facilitated the catalyst synthesis,and the product displayed good electrocatalytic performance for the oxygen reduction reaction in an alkaline medium,including a lower onset potential,lower mid-wave potential,four electron transfer process,and better durability compared with 20 wt%Pt/C.More importantly,the density functional theory results indicated that using the Zn vacancies in the prepared catalyst as active sites required a lower reaction energy to produce OOH*from*OO toward oxygen reduction reaction.Therefore,the proposed catalyst with Zn vacancies can be used as a potential electrocatalyst and may be substitutes for Pt-based catalysts in fuel cells,given the novel catalyst’s resulting performance. | Libing Hu Zengxi Wei Feng Yu Huifang Yuan Mincong Liu Gang Wang Bangfiua Peng Bin Dai Jianmin Ma | 2019 | Journal of Energy Chemistry2019，28，12： | 3 |
| 9 | Fe, V-co-doped C_(2)N for electrocatalytic N_(2)-to-NH_(3) conversion显示文摘Designing providential catalyst is the key to drive the electrochemical nitrogen reduction reactions(NRR),which is referring to multiple intermediates and products. By means of density functional theory(DFT)calculations, we studied heteronuclear bi-atom electrocatalyst(HBEC) for NRR. Our results revealed that compared to homonuclear bi-atom electrocatalyst(Fe_2@C_2N, V_2@C_2N), Fe, V-co-doped C_2N(Fe V@C_2N)had a smaller limiting potential of-0.17 V and could accelerate N_2-to-NH_3 conversion through the enzymatic pathway of NRR. Importantly, N–N bond length monotonically increases with increasing the Bader charges of adsorbed N_2 molecule but decreases with increasing the Bader charge difference of two adsorbed N atoms. Additionally, the Fe V@C_2N could suppress the production of H_2 by the preferential adsorption and reduction of N_2 molecule. Thus, the as-designed HBEC may have the outstanding electrochemical NRR performance. This work opens a new perspective for NRR by HBECs under mild conditions. | Zengxi Wei Jian He Yulu Yang Zhenhai Xia Yuezhan Feng Jianmin Ma | 2021 | Journal of Energy Chemistry2021，30，2： | 3 |
| 10 | A novel kind of multiple steady states characteristics in the dividing wall column显示文摘In this article, one kind of multiple steady states(MSS) phenomenon was investigated for a dividing wall column(DWC). The four-section model constructed in Aspen Plus was employed to simulate two DWC cases: mixture of n-hexane, n-heptane and n-octane;system of methanol, ethanol and n-propanol. It can be seen that there is a range of vapor split ratio in which multiple solutions of reflux ratio exist for fixed DWC configuration with the same feed and product streams. The width and the curve shapes of the MSS region, and the number of solutions change with the liquid split ratio. This MSS phenomenon was further explained using the component recovery around the prefractionator and the component recycling flow inside the DWC. This MSS phenomenon is helpful for DWC design by knowing the probable existence of multiple solutions in advance. | Erwei Song Zengxi Li Erqiang Wang | 2019 | Chinese Journal of Chemical Engineering2019，27，4： | 2 |
| 11 | Co-doped graphene edge for enhanced N2-to-NH3 conversion显示文摘N2 fixation in atmosphere is an important issue in modern chemistry.Designing an ideal electrochemical nitrogen reduction reaction(NRR)catalyst to overcome the sluggish reaction kinetic and ultralow selectivity is still the significant challenge.Herein,we screened the potential catalyst to accelerate N2 fixation by designing the single transition metal(TM)atoms(Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Mo,W,Ru and Rh)supported on the edge of graphene.Our calculations revealed that the Co atom supported on the graphene edge could selectively stabilize*N2 H species and destabilize*NH2 species,leading to the highest catalytic activity and selectivity for N2 fixation at the ambient conditions.In addition,the enzymatic mechanism of eNNR have the lowest overpotential of 0.72 V.This theoretical work will give a new perspective to design an available catalyst for NRR. | Zengxi Wei Yuezhan Feng Jianmin Ma | 2020 | Journal of Energy Chemistry2020，29，9： | 2 |
| 12 | Strain engineering the D-band center for Janus MoSSe edge: Nitrogen fixation显示文摘Nitrogen fixation is one of the most important and challenging process in production of ammonia at ambient temperature. We have first performed density function theory to propose the edge of Janus MoSSe(EJM) monolayer as a potential catalyst for nitrogen reduction reaction. Our results show that the superficial D-band centers play an important role in nitrogen fixation. The strain effects greatly alter the D-band center, and further change the interaction between the adsorbates and the surface of catalysts.Our findings provide a new thought into designing transition-metal chalcogenide catalysts for nitrogen fixation. | Xi Tang Zengxi Wei Quanhui Liu Jianmin Ma | 2019 | Journal of Energy Chemistry2019，28，6： | 2 |
| 13 | Control of shape and performance for direct laser fabrication of precision large scale metal parts with 316L stainless steel显示文摘 | MaMM WangZM ZengXY | 2013 | Optics and Laser Technology2013，45，： | 1 |
| 14 | Degradation of poly (ethylene terephthalate) using ionic liquids显示文摘 | Wang Hui Li Zengxi Liu Yanqing | | 0，，10： | 1 |
| 15 | A promising method for electrodeposition of aluminum on stainless steel in ionic liquid显示文摘 | Yue Guikuan Zhang Suojiang Li Zengxi | 2009 | AIChE Journal2009，55，3： | 1 |
| 16 | Laser-TIG hybridwelding of ultra-fine grained steel显示文摘 | GAOM ZENGXY HUQW | 2009 | Journal of MaterialsProcessing Technology2009，209，2： | 1 |
| 17 | Fe-containing magnetic ionic liquid as an effective catalyst for the glycolysis of poly(ethylene terephthalate) 显示文摘 | Wang Hui Ruiyi Yan Zengxi Li | 2010 | Catalysis Communications2010，11，： | 1 |
| 18 | Effects of Pb and Mg doping in Al 2 O 3 -supported Pd catalyst on direct oxidative esterification of aldehydes with alcohols to esters显示文摘 | Yanyan Diao Ruiyi Yan Suojiang Zhang Pu Yang Zengxi Li Lei Wang Haifeng Dong | 2009 | Journal of Molecular Catalysis A Chemical2009，，1： | 1 |
| 19 | Degradation of poly (ethylene terephthalate) using ionic liquids显示文摘 | Wang Hui Li Zengxi Liu Yanqing | 2009 | Green Chem2009，11，10： | 1 |
| 20 | Enhanced interface strength in steel-nickel bimetallic component fabricated using wire arc additive manufacturing with interweaving deposition strategy显示文摘Realizing improved strength in composite metallic materials remains a challenge using conventional welding and joining systems due to the generation and development of brittle intermetallic compounds caused by complex thermal profiles during solidification.Here,wire arc additive manufacturing(WAAM)process was used to fabricate a steel-nickel structural component,whose average tensile strength of 634 MPa significantly exceeded that of feedstock materials(steel,537 MPa and nickel,455 MPa),which has not been reported previously.The as-fabricated sample exhibited hierarchically structural heterogeneity due to the interweaving deposition strategy.The improved mechanical response during tensile testing was due to the inter-locking microstructure forming a strong bond at the interface and solid solutions strengthening from the intermixing of the Fe and Ni increased the interface strength,beyond the sum of parts.The research offers a new route for producing high-quality steel-nickel dissimilar structures and widens the design opportunities of monolithic components,with site-specific properties,for specific structural or functional applications. | Bintao Wu Zhijun Qiu Zengxi Pan Kristin Carpenter Tong Wang Donghong Ding Stephen Van Duin Huijun Li | 2020 | Journal of Materials Science & Technology2020，52，17： | 1 |
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