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Journal of Energy Chemistry 2016年第5期25卷 861-867页

作者： Yiyi Jia Yantao shi Jieshan Qiu Ce Hao State Key Laboratory of Fine Chemicals Dalian University of Technology

For some specific catalytic reaction, how to construct active sites on two dimensional materials is of great scientific significance. Dye-sensitized solar cells（DSCs） can be viewed as one representative photovoltaics because in which liquid electrolyte with triiodide/iodide（I;/I;） as redox couples are involved. In this study, amino-functionalized graphene（AFG） has been designed according to theoretically analyzing iodine reduction reaction（IRR） processes and rationally screening the volcanic plot. Then, such AFG has been successfully synthesized by a simple hydrothermal method and shows high electrocatalytic activity towards IRR when serving as counter electrode in DSCs. Finally, a high conversion efficiency of 7.39% by AFG-based DSCs was obtained, which is close to that using Pt as counter electrode.

关键词： Dye-sensitized solar cell Counter electrode Density functional theory Volcanic plot Amio-functionalized graphene

A positive correlation between local photocurrent and grain size in a perovskite solar cell

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Journal of Energy Chemistry 2022年第9期31卷 8-13,I0001页

作者： Xiaoxia Zhao Zhiyong Wang Wenming Tian Xianchang Yan Yantao shi Yudi Wang Zhonggao Sun Shengye Jin School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Fine Chemicals Department of ChemistrySchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Developing an interplay between the local morphological character and its local photovoltaic(PV)parameters in a perovskite thin film is essential for guiding the construction of highly-efficient perovskite solar cells(PSCs). To achieve a higher PSC performance, great efforts have been devoted to the growth of larger perovskite grains;however, how the gain size can influence the PSC performance in a working device remains unclear. Herein, using laser-scanned confocal microscopy coupled with a photocurrent detection module, we realize local photocurrent, photoluminescence(PL) intensity and PL lifetime mappings directly in a working PSC. For perovskite grains of various sizes(from ~500 nm to a few micrometers), their local photocurrent exhibit a statically positive correlation with the grain size, but anti-correlated with the grain’s local PL intensity. This result suggests that a larger perovskite grain likely has fewer defects and more importantly better interfacial contact with the charge collection layers and thus leads to higher charge collection efficiency, and the optimum grain size is found to be ≥2 μm.Our result provides important guidance to the growth and control of perovskite microstructures toward the further improvement of PSC performance.

关键词： Photocurrent mapping Photoluminescence mapping Perovskite solar cell Grain size

Asymmetrically ligated single atomic nickel sites for efficient hydrogen peroxide electrosynthesis

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Nano Research 2024年第3期17卷 1094-1100页

作者： Xusheng Cheng Jinwen Hu Wenzhe Shang Jingya Guo Cuncun Xin Songlin Zhang Suchan Song Wei Liu Yantao shi State Key laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsSchool of ChemistryDalian University of TechnologyDalian 116024China

Atomic transition-metal-nitrogen-carbon electrocatalysts hold great promise as alternatives to benchmark Pt in the oxygen reduction reaction.The pristine metal centers with quasi square-planar D_(4h) configuration,however,still suffer from unfavorable energetics and thereby strong activity/selectivity trade-off during the catalytic process.Here we present a ligand-field engineering of single-atom Ni-N-C catalysts to boost the sluggish kinetics via rationally constructing prototypical asymmetrically ligated Ni-N_(3)O_(1) sites.The as-obtained Ni-supported multi-walled carbon nanotubes with molten salt-treated(defined as Ni/CNS)catalyst delivered an excellent H_(2)O_(2) selectivity(>90%)within a wide potential window(0.2–0.7 V vs.reversible hydrogen electrode(RHE))and robust stability(for 10 h)in alkaline medium.Combined electron paramagnetic resonance and theoretical analysis rationalize this finding and demonstrate that the broken symmetry facilitates the electron transfer of a σ* to O–O orbital as compared to the Ni-N_(4) counterpart,playing an indispensable role in efficient O_(2) activation.

关键词： broken D4h single nickel sites oxygen reduction H_(2)O_(2)production

Insight into the CO2 photoreduction mechanism over 9-hydroxyphenal-1-one(HPHN) carbon quantum dots

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Journal of Energy Chemistry 2021年第1期30卷 269-276,I0009页

作者： Zhengyan Zhao Heming Zhang Xuedan Song Yantao shi Duanhui Si Hongjiang Li Ce Hao State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Converting CO2 to carbon-containing fuels is an effective approach to relieving energy shortages.Carbon quantum dots(CQDs) have shown distinct properties and attracted tremendous interest in CO2 reduction.Herein,we report a joint experimental-computational mechanistic study of photoreduction CO2 to CO on the model catalyst 9-hydroxyphenal-1-one(HPHN) CQDs with known structure.Our theoretical calculations reveal that the rate-determining step is COOH·formation,which is closely related to the proton and electron transfer induced by hydrogen bonding in the excited state.According to the calculated volcano plot,the solution we proposed is addition Zn^(2+) ions.The active center changed from the hydroxyl oxygen atom to the Zn atom and the barrier of the COOH·formation step is noticeably decreased when Zn^(2+) ions are added.It is further confirmed by the experimental data that the activity of CO2 reduction increases 2.9 times when Zn^(2+) ions are added.

关键词： CO2 reduction DFT study Reaction mechanism Hydrogen bonding Excited state

Multiple active components synergistically driven heteroatom-doped porous carbon as high-performance counter electrode in dye-sensitized solar cells

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Journal of Energy Chemistry 2019年第4期28卷 89-94页

作者： Hongyu Jing Danyang Wu Suxia Liang Xuedan Song Yonglin An Ce Hao Yantao shi State Key Laboratory of Fine Chemicals Dalian University of Technology

A facile template-free in situ self-activation approach for the multiple active components synergistically driven porous carbon was presented via a feasible annealing process.The biomass-derived carbon without additional activation reagents was fabricated using K-rich pomelo peel(PP)as the carbon source,which possesses a high electric conductivity where abundant functional hetero-metal atoms are doped into the carbon framework that playing the role of catalytic graphitization.The K^+that exists within the biomass can induce self-activation during pyrolysis apart from the activating gases during the pyrolysis process.The resulting electrocatalyst of PP-850(PP was pyrolyzed at 850°C in an N_2atmosphere)with abundant heteroatoms possesses a higher power conversion efficiency(PCE)of 7.81%as the counter electrode(CE)of dye-sensitized solar cells(DSCs)compared with the CEs calcinated at other temperatures and a similar PCE with Pt counterpart(8.24%)based on the liquid I_3^-/I^-electrolyte.The better electrocatalytic performance is attributed to the synergistic effect between self-activation and the co-doping of nitrogen,sulfur and phosphorus all together in a carbon matrix.Due to the feasibility of large-scale production,rich heteroatom doping,the PP-derived carbon,which simplifies the procedure and decreases the cost,has a potential application for an alternative electrocatalyst for high-performance photovoltaic devices.

关键词： Counter electrode Self-activation Biomass-derived carbon Electrocatalytic performance

A new D–D–π–A dye for efficient dye-sensitized solar cells

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Journal of Energy Chemistry 2016年第5期25卷 769-774页

作者： Xiaoqiang Yu Huailing Jiang Yi Wang Yantao shi Tingli Ma Ming Bao State Key Laboratory of Fine Chemicals Dalian University of Technology Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology

New metal-free organic dye sensitizers containing mono-triphenylamine or bis-triphenylamine as the electron donor, a thiophene as the π-conjugated system, and a cyanoacrylic acid moiety as the electron acceptor were synthesized. The optical and electrochemical properties of the dyes were investigated,and their performance as sensitizers in solar cells was evaluated. Dye-sensitized solar cells based on dye containing bis-triphenylamine as the electron donor produced a photon-to-current conversion efficiency of 6.06%（Jsc = 14.21 m A/cm;, Voc = 0.62 V, ff = 0.69） under 100 m W/cm;simulated AM 1.5 G solar irradiation（100 m W/cm;）.

关键词： Dye-sensitized solar cells Organic dye Bis-triphenylamine Electron donor Photon-to-current conversion efficiency

Innovative Architecture Design of Carbon-based Perovskite Solar Cells Improves Efficiency Greatly and Enables High Flexibility in Device Assembling

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Innovative Architecture Design of Carbon-based Perovskite So...

Bromine Doping as an Efficient Strategy to Reduce the Interfacial Defects in Hybrid 2D/3D Stacking Perovskite Solar Cells

第七届新型太阳能电池材料科学与技术学术研讨会

作者： Chunyang Zhang Yantao shi State Key laboratory of Fine Chemicals School of ChemistryDalian University of Technology

Currently,due to the serious energy loss stemming from carbon electrode in a chain of charge transfer dynamics,the performance of carbon-based perovskite solar cells(C-PSCs) is still far from satisfactory.In this work,for the first time we report a new-type and advanced modular C-PSCs consisting of two semi-cells that can be repeatedly assembled and disassembled with ease.By this

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Bromine Doping as an Efficient Strategy to Reduce the Interf...

New insight into the ultra-long lifetime of excitons in organic-inorganic perovskite： Reverse intersystem crossing

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Yanping Lv shi Wang Yantao shi State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology

Solar-to-electricity conversion efficiency(PCE) and stability are two important aspects of perovskite solar cells. However, both aspects are difficult to simultaneously enhance. In recent two years, 2D/3D stacking structure was reported to be a promising method to achieve both a higher PCE and improved stability simultaneously. However, when reducing the surface defects of 3D perovskite, the thin 2D capping layer itself may probably introduce additional interfacial defects in a 2D/3D stacking structure, which is thought to be able to trigger trap-assisted non-radiative recombination or ion migration. Thus, efforts should be paid to reduce the interfacial defects of 2D hybrid perovskite when serving as modification layer in a 2D/3D stacking structure PSCs. Here, we demonstrate that bromine(Br) doping of the 2D perovskite capping layer is an efficient strategy to passivate interfacial defects robustly, by which the photoluminescence lifetime is enhanced notably while the interfacial charge recombination is suppressed a lot. As a result, the PCE is enhanced from 18.01%(3D perovskite) to 20.07%(Br doped 2D/3D perovskite) along with improved moisture stability.

关键词： 2D/3D stacking structure doping interfacial defect

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Journal of Energy Chemistry 2018年第5期27卷 1496-1500页

作者： Guanghao Meng Yantao shi Xiangyuan Wang Wei Wang Shufeng Wang Min Ji Ce Hao State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 Liaoning China State Key Laboratory of Fine Chemicals Dalian University of Technology Panjin 124221 Liaoning. China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Department of Physics Peking University Beijing 100871 China

Recently, an effective exciton diffusion length L exceeding 100μm has been reported for organic- inorganic halide perovskites owing to both the high mobility and ultra-long lifetime of the excitons; however, the origin of ultra-long L is still unclear in nature. In some photoelectric materials, reverse intersystem crossing （RISC） from the triplet to the singlet state can enhance the quantum yield of pho- toluminescence greatly. In this study, our theoretical investigation indicated that the energy difference △E_st between the singlet state and the triplet state of CH_3NH_3Pbl_3 was less than 0.1 eV, which represents one crucial prerequisite for the occurrence of RISC. Meanwhile, the experimental results showed that the photoluminescence lifetime increased with the increasing temperature, a typical feature of RISC. Based on this study, we put forward the hypothesis that the ultra-long lifetime of excitons in organic-inorganic halide perovskite might be caused by the RISC process. This may provide a new insight into the important photophysical properties of such novel photovoltaic materials.

关键词： Inorganic-organic halide perovskite Photophysics Photoluminescence Reverse intersystem crossing Ultra-long lifetime

The Indirect Shared Steering Control Under Double Loop Structure of Driver and Automation

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IEEE/CAA Journal of Automatica Sinica 2020年第5期7卷 1403-1416页

作者： yantao Tian Yanbo Zhao Yiran shi Xuanhao Cao Ding-Li Yu Department of Control Science and Engineering and also with the Key Laboratory of Bionic Engineering of Ministry of EducationJilin UniversityChangchun 130022China the Xi’an Jiaotong University Xi’an 710049China Department of Control Science and Engineering Jilin UniversityChangchun 130022China School of Engineering Liverpool John Moores UniversityLiverpool L33AFU.K.and also with the Department of Control Science and EngineeringJilin UniversityChangchun 130022China

Due to the critical defects of techniques in fully autonomous vehicles,man-machine cooperative driving is still of great significance in today’s transportation system.Unlike the previous shared control structure,this paper introduces a double loop structure which is applied to indirect shared steering control between driver and automation.In contrast to the tandem indirect shared control,the parallel indirect shared control put the authority allocation system of steering angle into the framework to allocate the corresponding weighting coefficients reasonably and output the final desired steering angle according to the current deviation of vehicle and the accuracy of steering angles.Besides,the active disturbance rejection controller(ADRC)is also added in the frame in order to track the desired steering angle fleetly and accurately as well as restrain the internal and external disturbances effectively which including the steering friction torque,wind speed and ground interference etc.Eventually,we validated the advantages of double loop framework through three sets of double lane change and slalom experiments,respectively.Exactly as we expected,the simulation results show that the double loop structure can effectively reduce the lateral displacement error caused by the driver or the controller,significantly improve the tracking precision and keep great performance in trajectory tracking characteristics when driving errors occur in one of driver and controller.

关键词： Active disturbance rejection controller(ADRC) authority allocation indirect shared control