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Thermoelectric Properties of an Indandione-Terminated Quinoidal Compound:Effect of the n-Type Dopants

Chinese Journal of Chemistry 2024年第9期42卷 997-1003页

作者： Yingying Liu Cheng Wang Tianzuo Wang Fei Jiao Shaoqiang Dong Yunfeng Deng Yanhou Geng School of Materials Science and Engineering and Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin Universityand Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China Institute of Molecular Aggregation Science Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistrySchoolof ScienceTianjin UniversityTianjin300072China Joint Schoolof NationalUniversity of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New City FuzhouFujian350207China

The investigation of n-type doping holds a significant interest for the application of thermoelectrics.Herein,the doping of an indandione-terminated compound Q-4F with a singlet open-shell ground state was studied using two n-dopants N-DMBI and LCV.Both of these two dopants can effectively dope Q-4F due to the large offset between the singly occupied molecular orbital(SOMO)of dopants and the lowest unoccupied molecular orbital(LUMO)of Q-4F.N-DMBI has a higher doping ability than LCV as demonstrated by the UV-vis-NIR and EPR measurements.However,in comparison to N-DMBI doped Q-4F,LCV doped system exhibits much higher electrical conductivity and power factor due to its unperturbed molecular packing and favorable morphology after doping.The optimal conductivity of LCV doped Q-4F is 7.16×10^(-2)±0.16 S·cm^(-1) and the highest power factor reaches 12.3±0.85μW·m–1·K^(-2).These results demonstrate that the modulation of n-dopants is a powerful strategy to balance the doping efficiency and microstructure toward a maximum thermoelectric performance.

关键词： n-Doping Indandione Quinoidal compounds Organic thermoelectrics Electron transfer Organic electronics energy conversion

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Hole-Transporting Materials with Rational Combination of Pyridine and Dibenzo[a,c]phenazine as Electron Acceptor for Dopant-Free Perovskite Solar Cells

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Chinese Journal of Chemistry 2024年第10期42卷 1100-1106页

作者： Weidong Ling Fei Wu Wentao Yuan Linna Zhu Qianqian Li Zhen Li Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials Department of ChemistryWuhan UniversityWuhanHubei 430072China Chongqing Key Laboratory for Advanced Materials and Technologies of Clean energy Faculty of Materials&EnergySouthwest UniversityChongqing400715China TaiKang Center for Life and Medical Sciences Wuhan UniversityWuhanHubei 430072China

Perovskite solar cells(PSCs)have been proven to be a promising option for photovoltaic conversion.With the aim to achieve efficient and stable PSCs,it is essential to explore dopant-free hole-transporting materials(HTMs)with high hole mobility.Herein,HTMs bearing electron donor(D)-electron acceptor(A)-electron donor(D)structures have been constructed with strong intramolecular charge transfer(ICT)effect,based on rational combination of dibenzo[a,c]phenazine and pyridine as electronic acceptors and anchoring groups to perovskite layer.Accordingly,high hole mobility(7.31×10^(-5) cm^(2)·V^(-1)·s^(-1))and photoelectric conversion efficiency(20.45%)have been achieved by dopant-free DPyP-based PSC.It afforded an efficient way to design HTMs with high hole mobility by adjustment of molecular configurations and electronic property of conjugated systems.

关键词： Perovskite solar cell Charge transfer Donor-acceptor systems energy conversion Hole mobility

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Efficient Contact between H_(2)O and N-Coordinate Ru Nanoparticles in Three-Dimensionally Ordered Macro/Mesoporous Carbon Boosting Alkaline HER

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Chinese Journal of Chemistry 2024年第2期42卷 164-170页

作者： Jiaqing Luo Chunyu Liu Ruolin Zhang Yuanqing Sun Hua Xu Qingying Hu Manxue Zhang Jun Li Zhenxing Li Weiyu Song Yuechang Wei Jian Liu State Key Laboratory of Heavy Oil and Bejing Key Lab of Oil&Gas Optical Detection Technology China University of PetroleumBeijing 102249China Laboratory of Heavy Oil at Karamay Ching University of Petroleum-Beijing at KaramayKaramayXinjiang 83400China Basic Research Center for energy Interdisciplinary College of ScienceChina University of PetroleumBeijing 102249China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China BeijingNationalLaboratoryfor Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In this study,a novel approach is proposed to achieve the uniformly dispersed Ru nanoparticles with N coordination loaded on three-dimensionally ordered macro/mesoporous carbon(3DOMMC)through simultaneous pyrolysis of Ru^(3+)and cyanamide on 33DOMMC.In an alkaline medium,the synthesized catalysts exhibit exceptional hydrogen evolution reaction(HER)performance.Specificall,Ru-N/3DOMMC demonstrates a significantly low overpotential of 13.8 mV to achieve acrent density of 10 mA.cmzandit exhibits a mass activity 17.5 times higher than that of commercial Pt/C.The outstanding performance could be attributed to the ultrahigh Ru dispersion and more efficient contact between active sites and reactant,which derived from the large specific surface area and interconnective three-dimensionally macro/mesopores of 3DOMMC.

关键词： 3DOMMC Hydrogen evolution reaction Electrocatalysis Solid-liquid contact energy conversion

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Noble metal-based high-entropy alloys as advanced electrocatalysts for energy conversion

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Rare Metals 2021年第9期40卷 2354-2368页

作者： Yu-Chen Qin Feng-Qi Wang Xin-Ming Wang Ming-Wei Wang Wen-Long Zhang Wan-Kai An Xiao-Peng Wang Yun-Lai Ren Xin Zheng Dong-Can Lv Ayyaz Ahmad College of Sciences Henan Agricultural UniversityZhengzhou 450000China State-Key Laboratory of Chemical Engineering and Shanghai Key Laboratory of Multiphase Materials Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Department of chemical Engineering MNS University of Engineering and Technology Multan 60000Pakistan

Noble metal-based high-entropy alloy nanoparticles(NM-HEA NPs) have exhibited brilliant catalytic performance toward electrocatalytic energy conversion and attracted increasing attention. The near-equimolar mixed elements of NM-HEA NPs may result in the unique properties including cocktail effect, high entropy effect and lattice distortion effect, which are beneficial for improving the catalytic performance and reducing the amount of noble metal. Herein, several advanced NM-HEA NPs as electrocatalysts for energy conversion are systematically summarized. The preparation methods of NM-HEA NPs are evaluated as well as the catalytic properties and mechanism are discussed classified by electrocatalytic reactions. Finally,the challenges and prospects in this field are carefully discussed. This review provides an overview on recent advances of NM-HEA electrocatalysts for energy conversion and draws more attention in this infant research field.

关键词： Noble metal-based high-entropy alloys Electrocatalysis energy conversion Synthesis Catalytic performance

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Plasmonic metal/semiconductor hybrid nanomaterials for solar to chemical energy conversion

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Journal of energy Chemistry 2021年第12期30卷 40-53,I0002页

作者： Cancan Zhang Yuying Zhang Wei Xie Key Lab of Advanced energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China School of Medicine Nankai UniversityTianjin 300071China

Plasmonic nanomaterials are sources of light,heat and electrons at nanometer scale.Given the outstanding performance in harvesting and converting solar energy under visible light irradiation,hybrid nanomaterials with plasmonic activity have recently emerged as a new class of advanced photocatalysts.Because of the enhanced charge-separation at hybrid interfaces,the hybrids usually exhibit higher catalytic activity compared with their monometallic counterparts.Here,we review the recent progress on synthesis of plasmonic hybrid nanomaterials and their applications in photocatalysis,including H2 production,CO_(2) reduction and N2 fixation.We hope this review will give systematic and valuable reference on plasmonic solar to chemical energy conversion.

关键词： Plasmon Hybrid nanomaterials energy conversion

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Construction of hierarchical functional nanomaterials for energy conversion and storage

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Particuology 2020年第1期18卷 34-47页

作者： Jianhua Shen Yu Wang Kailun Gu Yihua Zhu Yanjie Hu Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Hierarchical functional nanomaterials have important applications in the fields of new energy and the environment because of performance advantages based on the coupling and collaboration of multilevel structures.The key to application is the design and control of the mesoscale structures,such as the crystal-facet structure,lattice orientation,defects,and dislocations.In this review,we present the controlled synthesis of novel semiconductor oxide and carbon-based nanocomposites with three-dimensional hierarchical structures by the multiphase-reaction process.We describe several typical reaction processes,such as the gas-phase flame-combustion method,the vapor-phase deposition technique,and the solid-liquid interface reaction process,to investigate the properties of fluid flow,mixing,transport,and chemical reaction.We also study the formation mechanism,structural evolution and control methods for hierarchical nanomaterials by using combined experimental and simulation methods.These well-designed and prepared hierarchical functional materials can be used in energy storage and conversion fields.Valuable information is provided for the structural design and performance control of new functional nanocomposites.

关键词： Mesoscale structure Hierarchical nanostructure Structure-performance relationship energy storage energy conversion

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Hydrogel photocatalysts for efficient energy conversion and environmental treatment

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Frontiers in energy 2021年第3期15卷 577-595页

作者： Wenwei LEI Norihiro SUZUKI Chiaki TERASHIMA Akira FUJISHIMA School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdao 066004ChinaPhotocatalysis International Research CenterTokyo University of Science2641 YamazakiNodaChiba 278-8510Japan Photocatalysis International Research Center Tokyo University of Science2641 YamazakiNodaChiba 278-8510Japan

Photocatalysts have attracted great research interest owing to their excellent properties and potential for simultaneously addressing challenges related to energy needs and environmental pollution.Photocatalytic particles need to be in contact with their respective media to exhibit efficient photocatalytic performances.However,it is difficult to separate nanometer-sized photocatalytic materials from reaction media later,which may lead to secondary pollution and a poor recycling performance.Hydrogel photocatalysts with a three-dimensional(3D)network structures are promising support materials for photocatalysts based on features such as high specific surface areas and adsorption capacities and good environmental compatibility.In this review,hydrogel photocatalysts are classified into two different categories depending on their elemental composition and recent progresses in the methods for preparing hydrogel photocatalysts are summarized.Moreover,current applications of hydrogel photocatalysts in energy conversion and environmental remediation are reviewed.Furthermore,a comprehensive outlook and highlight future challenges in the development of hydrogel photocatalysts are presented.

关键词： hydrogel photocatalysts energy conversion environmental treatment

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A review of pulse electrolysis for efficient energy conversion and chemical production

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Journal of energy Chemistry 2021年第8期30卷 69-82,I0003页

作者： Tao Liu Jinling Wang Xuejing Yang Ming Gong Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University200438 ShanghaiChina National Engineering Laboratory for Industrial Wastewater Treatment East China University of Science and Technology200237 ShanghaiChina

Electrochemical transformation emerges as an important solution to sustainable energy conversion and chemical production.Conventional electrolytic systems usually operate under galvanostatic or potentiostatic conditions that sometimes result in unsatisfactory efficiencies or selectivities.Pulse electrolysis by pulsating and programming the potentials/currents can feature unique tunability to the electrodeelectrolyte interface properties that can give rise to drastically different electrochemical behaviors compared to the steady-state counterparts.Although invented almost 100 years ago,pulse electrolysis has received little attention over the period,but has recently attracted a revived focus toward the energyefficient electrolysis.This review will summarize the history and recent efforts of pulse electrolysis in three categories:water electrolysis,CO_(2)electrolysis and other electrolysis.In each section,the advantage of pulse electrolysis over steady-state electrolysis will be discussed in detail,giving a comprehensive overview of the pulse effect on the electrolytic systems.Finally,we will provide our vision of future directions in pulse electrolysis based on previous works.

关键词： Pulse electrolysis energy conversion Chemical production Water splitting CO_(2) reduction energy electrocatalysis

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EFFECT OF ENLARGED FREE JET ON energy conversion IN PELTON TURBINE

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Journal of Hydrodynamics 2006年第2期18卷 211-218页

作者： LIU Jie WEI Cai-xin HAN Feng-qin School of Power and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Electric Power South China University of Technology Guangzhou 510640 China

In Pelton turbines, when the water jet emerges in the air, its velocity decreases downstream and its diameter increases to meet the continuity. In this paper, a physical parameter, the enlarging rate of jet diameter kDi was introduced and measured experimentally. The measurement of enlarging rate was carried out in three model turbines with different distributing Y-branch and nozzle configurations under various operating conditions. The effect of jet enlarging rate on the unsteady water sheet flow in the rotating buckets has not been investigated so tar. This paper also presents the comparative numerical analysis of the flow in buckets at different enlarging rates of jet. It is shown that the effect of jet enlargement is so large that the flow pattern in the bucket is drastically changed by the latter half of the frames, The jet with large enlarging rate also introduces worse energy behavior to the hydraulic performance of the Pelton turbine. Besides, the phenomenon of jet interference was also discussed by using the results of numerical simulation for one jet. It indicates that the jet with large enlarging rate takes more risk that jet interference may damage the performance of multi-nozzle Pelton turbine.

关键词： energy conversion enlarging rate bucket flow jet interference

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Rotational energy conversion and thermal evolution of neutron stars

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Chinese Physics C 2017年第12期41卷 155-160页

作者：朱翠周霞王娜 Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi 830011 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Urumqi 830011 China University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China

Pulsars are rapidly spinning, strongly magnetized neutron stars. Their electromagnetic dipole radiation is usually assumed to be at the expense of the rotational energy. In this work, we consider a new channel through which rotational energy could be radiated away directly via neutrinos. With this new energy conversion channel, we can improve the chemical heating mechanism that originates in the deviation from β equilibrium due to spin-down compression. The improved chemical and thermal evolution equations with different magnetic field strengths are solved numerically. The results show that the new energy conversion channel could raise the surface temperature of neutron stars, especially for weak field stars at later stages of their evolution. Moreover, our results indicate that the new energy conversion channel induced by the non-equilibrium reaction processes should be taken into account in the study of thermal evolution.

关键词： neutron star rotation thermal evolution energy conversion

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