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Science china Chemistry 2025年

作者： Rui Yu Xi Cao Chengyang Zhu Qingqing Chen Ziyi Yan Binbin Jiang Junjie Mao Xianwen Wei Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes College of Chemistry and Materials ScienceAnhui Normal University Anhui Provincial Key Laboratory of Advanced Catalysis and Energy Materials School of Chemistry and Chemical Engineering Anqing Normal University School of Chemistry and Chemical Engineering Anhui University of Technology

Developing highly efficient and cost-effective electrocatalysts for hydrogen evolution reaction（HER） is grandly challenging in alkaline and alkaline seawater electrolytes. Herein, the asymmetric interfacial active sites with Ru nanoparticles and Ni single atoms in Ru/Ni-N-C were designed through a solvothermal-pyrolysis process. Constructing highly asymmetric interfacial active sites with a strong electron delocalization effect significantly improves HER kinetics. As expected, Ru/Ni-N-C requires low overpotentials with around 20 mV at 10 mA cm-2and robust durability over 48 h in alkaline and alkaline seawater *** at 200 mA cm-2, the overpotentials are close to 100 mV in both above electrolytes for Ru/Ni-N-C. Density function theory calculation results suggest that the asymmetric interface between Ru nanoparticle and Ni-N-C could accelerate the dissociation of water molecules and modulate the hydrogen species, consequently improving the HER performances. This work opens a unique approach for constructing advanced materials for energy conversion.

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Stability of Planar Diffusion Wave for the Quasilinear Wave Equation with Nonlinear Damping

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Acta Mathematicae Applicatae Sinica 2015年第1期31卷 17-30页

作者： Yan YONG College of Science University of Shanghai for Science and Technology

In this paper, we will show that under some smallness conditions, the planar diffusion wave v（x1/√＋t）is stable for a quasilinear wave equation with nonlinear damping：vtt-△f（v）＋vt＋g（vt）=0_3 x=（x1,x2…,xn）∈Rn,where v（x1/√1＋t）is the unique similar solution to the one dimensional nonlinear heat equa-tion：vt-f（v）x1 x1=0,f＇（v）〉0,v＋（∞,t）=v±,v＋≠v_.We also obtain the L∞ time decay rate whichreads‖v-v‖L∞=О（1）（1＋t）-r/4,where r=min（3,n）.To get the main result, the energy method and a newinequality have been used.

关键词： stability planar diffusion wave quasilinear wave equation nonlinear damping

Improved performance of polymer solar cells by using inorganic, organic, and doped cathode buffer layers

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Chinese Physics B 2016年第3期25卷 428-433页

作者：王桃红陈长博郭坤平陈果徐韬魏斌 School of Materials Science and Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China Sino-European School of Technology Shanghai University Shanghai 200444 China

The interface between the active layer and the electrode is one of the most critical factors that could affect the device performance of polymer solar cells. In this work, based on the typical poly（3-hexylthiophene）：[6,6]-phenyl C61-butyric acid methyl ester （P3HT：PCBM） polymer solar cell, we studied the effect of the cathode buffer layer （CBL） between the top metal electrode and the active layer on the device performance. Several inorganic and organic materials commonly used as the electron injection layer in an organic light-emitting diode （OLED） were employed as the CBL in the P3HT：PCBM polymer solar cells. Our results demonstrate that the inorganic and organic materials like Cs2CO3, bathophenanthroline （Bphen）, and 8-hydroxyquinolatolithium （Liq） can be used as CBL to efficiently improve the device performance of the P3HT：PCBM polymer solar cells. The P3HT：PCBM devices employed various CBLs possess power conversion efficiencies （PCEs） of 3.0%-3.3%, which are ca. 50% improved compared to that of the device without CBL. Furthermore, by using the doped organic materials Bphen：Cs2CO3 and Bphen：Liq as the CBL, the PCE of the P3HT：PCBM device will be further improved to 3.5%, which is ca. 70% higher than that of the device without a CBL and ca. 10% increased compared with that of the devices with a neat inorganic or organic CBL.

关键词： polymer solar cell interface cathode buffer layer morphology

Single-Photon Transport Properties in Coupled-Resonator Waveguide with Nonlocal Coupling to a Whispering-Gallery Resonator Interacting with Two Separated Atoms

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Chinese Physics Letters 2014年第7期31卷 12-15页

作者：周桃臧小飞陈静 School of Mathematics and Physics Shanghai University of Electric Power Shanghai 200090 Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093

We investigate the single-photon transport properties in a one-dimensional coupled-resonator waveguide non-locally coupled to a whispering-gallery resonator embedded with two separated two-level atoms based on the real-space approach. The control of single-photon transport is realized by modulating the detuning between two separated atoms, phase differences, and the symmetric/asymmetric nonlocal couplings. The multi-frequency photon-filter is obtained, and the influences of dissipation effects on single-photon transmission spectra and the phase shift are also discussed.

关键词： SINGLE photon generation TRANSPORT theory (Mathematics) OPTICAL waveguides RESONATORS ATOMIC spectra

Convergence error estimates of the Crank-Nicolson scheme for solving decoupled FBSDEs

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Science china Mathematics 2017年第5期60卷 923-948页

作者： LI Yang YANG Jie ZHAO WeiDong College of Science University of Shanghai for Science and Technology School of Mathematics Shandong University

In this work, we theoretically analyze the convergence error estimates of the Crank-Nicolson （C-N） scheme for solving decoupled FBSDEs. Based on the Taylor and ItS-Taylor expansions, the Malliavin calculus theory （e.g., the multiple Malliavin integration-by-parts formula）, and our new truncation error cancelation techniques, we rigorously prove that the strong convergence rate of the C-N scheme is of second order for solving decoupled FBSDEs, which fills the gap between the second-order numerical and theoretical analysis of the C-N scheme.

关键词： convergence analysis Crank-Nicolson scheme decoupled forward backward stochastic differentialequations Malliavin calculus trapezoidal rule

Synergistic effect of ozonation and ionizing radiation for PVA decomposition

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Journal of Environmental Sciences 2015年第8期27卷 63-67页

作者： Weihua Sun Lujun Chen Yongming Zhang Jianlong Wang College of Life and Environmental Sciences Shanghai Normal University School of Environment Tsinghua University Zhejiang Provincial Key Laboratory of Water Science and Technology Laboratory of Environmental Technology INET Tsinghua University

Ozonation and ionizing radiation are both advanced oxidation processes（AOPs） without chemical addition and secondary pollution. Also, the two processes＇ efficiency is determined by different p H conditions, which creates more possibilities for their combination. Importantly,the combined process of ozonation and ionizing radiation could be suitable for treating wastewaters with extreme p H values, i.e., textile wastewater. To find synergistic effects, the combined process of ozonation and ionizing radiation mineralization was investigated for degradation of polyvinyl alcohol（PVA） at different p H levels. A synergistic effect was found at initial p H in the range 3.0–9.4. When the initial p H was 3.0, the combined process of ozonation and ionizing radiation gave a PVA mineralization degree of 17%. This was 2.7 times the sum achieved by the two individual processes, and factors of 2.1 and 1.7 were achieved at initial p H of7.0 and 9.4, respectively. The combined process of ozonation and ionizing radiation was demonstrated to be a feasible strategy for treatment of PVA-containing wastewater.

关键词： PVA Ozonation Ionizing radiation Synergistic effect Mineralization

Efficiency enhancement in DIBSQ：PC71BM organic photovoltaic cells by using Liq-doped Bphen as a cathode buffer layer

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Frontiers of Materials Science 2017年第3期11卷 233-240页

作者： Guo CHEN Changfeng SI Pengpeng ZHANG Kunping GUO Saihu PAN Wenqing ZHU Bin WEI Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai 200072 China

We have improved the photovoltaic performance of 2,4-bis[4-（N,N- diisobutylamino）-2,6-dihydroxyphenyl] squaraine：[6,6]-phenyl C71-butyric acid methyl ester （DIBSQ：PC71BM） organic photovoltaic （OPV） cells via incorporating Liq-doped Bphen （Bphen-Liq） as a cathode buffer layer （CBL）. Based on the Bphen-Liq CBL, a DIBSQ：PC71BM OPV cell possessed an optimal power conversion efficiency of 4.90%, which was 13% and 60% higher than those of the devices with neat Bphen as CBL and without CBL, respectively. The enhancement of the device performance could be attributed to the enhanced electron mobility and improved electrode/active layer contact and thus the improved photocurrent extraction by incorporating the Bphen-Liq CBL. Light-intensity dependent device performance analysis indicates that the incorporating of the Bphen-Liq CBL can remarkably improve the charge transport of the DIBSQ：PC71BM OPV cell and thus decrease the recombination losses of the device, resulting in enhanced device performance. Our finding indicates that the doped Bphen-Liq CBL has great potential for high-performance solution-processed small-molecule OPVs.

关键词： organic photovoltaic cells squaraine cathode buffer layer power conversion efficiency solution-process

Tight monomials for type B3

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Frontiers of Mathematics in china 2014年第1期9卷 213-238页

作者： Xiaoming WANG College of Information Technology Shanghai Ocean University Shanghai 201306 China

The global crystal basis or canonical basis plays an important role in the theory of the quantized enveloping algebras and their representations. The tight monomials are the simplest elements in the canonical basis. W... 详细信息

关键词： Quantized enveloping algebra canonical basis tight monomial

Stability switches and Bogdanov-Takens bifurcation in an inertial two-neuron coupling system with multiple delays

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Science china(Technological Sciences) 2014年第5期57卷 893-904页

作者： SONG ZiGen XU Jian College of Information Technology Shanghai Ocean University School of Aerospace Engineering and Applied Mechanics Tongji University

In this paper,we investigate an inertial two-neural coupling system with multiple *** analyze the number of equilibrium points and demonstrate the corresponding pitchfork *** show that the system has a unique equilibrium as well as three equilibria for different values of coupling *** local asymptotic stability of the equilibrium point is studied using the corresponding characteristic *** find that multiple delays can induce the system to exhibit stable switching between the resting state and periodic *** regions with delay-dependence are exhibited in the parameter plane of the time delays employing the Hopf bifurcation *** obtain the global perspective of the system dynamics,stability and periodic activity involving multiple equilibria are investigated by analyzing the intersection points of the pitchfork and Hopf bifurcation curves,called the Bogdanov-Takens(BT)*** homoclinic bifurcation and the fold bifurcation of limit cycle are obtained using the BT theoretical results of the third-order normal ***,numerical simulations are provided to support the theoretical analyses.

关键词： inertial two-neuron system multiple delays stability switches Bogdanov-Takens bifurcation multiple stability

Manipulating Single-Photon Transport Properties in an Asymmetrical Waveguide Coupled to a Whispering-Gallery Resonator Containing a Two-Level Atom

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Chinese Physics Letters 2014年第4期31卷 9-12页

作者： ZHOU Tao ZANG Xiao-Fei XU Dan-Hua School of Mathematics and Physics Shanghai University of Electric Shanghai 200090 Engineering Research Center of Optical Instrument and System (Ministry of Education) and Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093

A hybrid system containing an asymmetrical waveguide coupled to a whispering-gallery resonator embedded with a two-level atom is designed to investigate single-photon transport properties. The transmission and reflection amplitudes are obtained via the discrete coordinates approach. Numerical simula, tion demonstrates that a tri- frequency photon attenuator is realized by controlling the couplings between the asymmetrical waveguide and the whispering-gallery resonator. The phase shift, group delay and dissipation effects of the transmitted single-photon are also discussed.

关键词： PHOTON transport theory WAVEGUIDES RESONATORS ENERGY dissipation ELECTROMAGNETISM