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Self-supported copper-based gas diffusion electrodes improve the local CO_(2)concentration for efficient electrochemical CO_(2)reduction

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Frontiers of Chemical Science and Engineering 2024年第3期18卷 51-62页

作者： Azeem Mustafa Bachirou Guene Lougou Yong Shuai Zhijiang Wang Haseeb-ur-Rehman Samia Razzaq Wei Wang Ruming Pan jiupeng zhao Key Laboratory of Aerospace Thermophysics of MIIT Harbin Institute of TechnologyHarbin150001China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin150001China Mechanical Engineering Department University of Engineering and TechnologyTaxila47050Pakistan School of Aerospace Mechanical and Mechatronics EngineeringUniversity of SydneySydney2006Australia

Electrochemical CO_(2)reduction is a sustainable approach in green chemistry that enables the production of valuable chemicals and fuels while mitigating the environmental impact associated with CO_(2)emissions.Despite its several advantages,this technology suffers from an intrinsically low CO_(2)solubility in aqueous solutions,resulting in a lower local CO_(2)concentration near the electrode,which yields lower current densities and restricts product selectivity.Gas diffusion electrodes(GDEs),particularly those with tubular architectures,can solve these issues by increasing the local CO_(2)concentration and triple-phase interface,providing abundant electroactive sites to achieve superior reaction rates.In this study,robust and self-supported Cu flow-through gas diffusion electrodes(FTGDEs)were synthesized for efficient formate production via electrochemical CO_(2)reduction.They were further compared with traditional Cu electrodes,and it was found that higher local CO_(2)concentration due to improved mass transfer,the abundant surface area available for the generation of the triple-phase interface,and the porous structure of Cu FTGDEs enabled high formate Faradaic efficiency(76%)and current density(265 mA¸cm^(−2))at–0.9 V vs.reversible hydrogen electrode(RHE)in 0.5 mol·L^(−1)KHCO3.The combined phase inversion and calcination process of the Cu FTGDEs helped maintain a stable operation for several hours.The catalytic performance of the Cu FTGDEs was further investigated in a non-gas diffusion configuration to demonstrate the impact of local gas concentration on the activity and performance of electrochemical CO_(2)reduction.This study demonstrates the potential of flow-through gas-diffusion electrodes to enhance reaction kinetics for the highly efficient and selective reduction of CO_(2),offering promising applications in sustainable electrochemical processes.

关键词： CO_(2)electroreduction flow-through delivery hollow fiber structure local concentration formate

Designing TiO_(2)/Au/Prussian blue heterostructures nanorod arrays for ultra-stable cycle and ultra-fast response electrochromism

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Nano Research 2023年第2期16卷 3294-3303页

作者： Miao Xu Kang Li Shen Wang Shengyu Zhou Hulin Zhang Hongbo Xu jiupeng zhao Yao Li School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China School of Physics Southeast UniversityNanjing 211189China Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150001China

Prussian blue(PB)is an anodic coloring candidate in the wide area of electrochromic(EC)applications.However,the co-influence of weak adhesion and low electrical conductivity leads to the poor stability and slow switching speed.To tackle this bottleneck,a novel TiO_(2)/Au/PB nanorod array is designed through hydrothermal and electrodeposition approaches on fluorine-doped tin oxide(FTO)glass.Such a designed ternary array structure could not only increase reactive site and conductivity,but also improve ion storage capacity and promote charge transfer,attributed to the synergistic effect of TiO_(2)/Au/PB core–shell heterostructure and the localized surface plasmon resonance(LSPR)effect of Au nanoparticles.Besides,density functional theory(DFT)calculation confirms the strong interaction between rutile TiO_(2)and FTO substrate,which contributes to the improvement of EC cycle stability.Benefiting from these effects,the TiO_(2)/Au/PB film shows a fast coloration/bleaching response of 1.08/2.01 s(2.17/4.48 s,PB film)and ultra-stable EC performance of 86.8%after 20,000 cycles(50%after 600 cycles,PB film).Furthermore,the high-intensity light source can be shot clearly by the designed and assembled EC iris device(ECID)with TiO_(2)/Au/PB film as an EC layer,while the photograph without an ECID is blurry,confirming the feasibility of the material in portable digital products.

关键词： electrochromic Prussian blue Au nanoparticle TiO_(2)nanorod array heterojunction

Effect of Unit Cell Shape on Switchable Infrared Metamaterial VO_(2)Absorbers/Emitters

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Research 2021年第1期2021卷 994-1001页

作者： Feifei Ren Jinxin Gu Hang Wei Gaoping Xu jiupeng zhao Shuliang Dou Yao Li 1 Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Metamaterial absorber/emitter is an important aspect of infrared radiation manipulation.In this paper,we proposed four simple switchable infrared metamaterial absorbers/emitters with Ag/VO_(2)disks on the Ag plane employing triangle,square,hexagon,and circle unit cells.The spectral absorption peaks whose intensities are above 0.99 occur at~4μm after structure optimization when VO_(2)is in insulating state and disappear when VO_(2)becomes metallic state.The simulated electromagnetic field reveals that the spectral absorption peaks are attributed to the excitation of magnetic polariton within the insulating VO_(2)spacer layer,whose values exceed 1.59 orders of magnitude higher than the incident magnetic field.Longer resonant wavelength would be excited in square arrays because its configuration is a better carrier of charges at the same spans.For absorption stability,the absorbers/emitters with square and circular structures do not have any change with the polarization angles changing from 0°to 90°,due to the high rotational symmetric structure.And four absorbers/emitters reveal similar shifts and attenuations under different incident angles.We believed that the switchable absorber/emitter demonstrates promising applications in the sensing technology and adaptive infrared system.

关键词： emitter polarization absorber

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基于ICP算法的移动机器人激光定位研究

激光与光电子学进展 2024年第8期61卷 89-98页

作者：赵龙云伞红军陈久朋彭真昆明理工大学机电工程学院云南昆明650500 云南省先进装备智能制造技术重点实验室云南昆明650500

针对移动机器人在进行传统2D环境的定位时所存在的定位精度低且定位实时性差等问题,提出一种改进的迭代近邻点(ICP)算法的定位方法。首先,建立位姿搜索空间,采用由低到高的分辨率对搜索空间进行逐层搜索,并结合多点云密度进行部分点云... 详细信息

针对移动机器人在进行传统2D环境的定位时所存在的定位精度低且定位实时性差等问题,提出一种改进的迭代近邻点(ICP)算法的定位方法。首先,建立位姿搜索空间,采用由低到高的分辨率对搜索空间进行逐层搜索,并结合多点云密度进行部分点云扫描匹配,排除非最优位姿,加速搜索过程;在进行点云匹配中,采用帧对图的方式,有效地利用了历史帧信息;对得到的最优位姿进行稀疏矩阵位姿优化,进一步提高定位精度。在SLAM Benchmark数据集上进行测试,结果表明所提方法的算法效率是现流行的Cartographer算法的1.8倍到4.9倍之间,同时平移误差较小。并利用Turtlebot2机器人进行实际测试,结果表明所提方法的定位误差相比Cartographer和Gmapping均有明显的降低,且实时性较好;与传统的自适应蒙特卡罗重定位(AMCL)相比,平移误差均值降低了0.035 m,旋转误差均值降低了0.001 rad,具有较高的重定位精度。

关键词：激光雷达移动机器人定位多分辨率迭代近邻点多点云密度

基于粒子群优化-熵权无偏灰色马尔可夫模型的沥青道面性能预测

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东南大学学报（自然科学版） 2024年第2期54卷 416-422页

作者：李岩张久鹏何印章赵晓康张子轩长安大学公路学院西安710064 Department of Civil Engineering The University of British ColumbiaVancouver V6T 1Z4Canada 长安大学运输工程学院西安710064

为提高沥青道面使用性能的预测精度,针对道面性能数据累积年限少、波动大的特点,采用熵值法对多个道面单元进行赋权,并利用粒子群算法(PSO)和马尔可夫模型对传统无偏灰色模型残差序列的状态区间和白化系数进行优化,构建可准确预测沥青... 详细信息

为提高沥青道面使用性能的预测精度,针对道面性能数据累积年限少、波动大的特点,采用熵值法对多个道面单元进行赋权,并利用粒子群算法(PSO)和马尔可夫模型对传统无偏灰色模型残差序列的状态区间和白化系数进行优化,构建可准确预测沥青道面性能的PSO-熵权无偏灰色马尔可夫模型.结合西北某机场沥青道面6个检测单元前7年的道面状况指数进行模型精度检验,结果表明:与传统无偏灰色模型相比,经马尔可夫模型划分残差序列空间并使用PSO算法寻找最佳白化函数后,优化模型第1年~第5年各单元残差和相对误差均减小,且整体预测精度分别提高0.05%、0.28%、0.05%、0.03%和0.14%,第6、7年的整体预测精度分别提高12.9%和19.2%,说明优化后的模型对实际沥青道面的预测结果更具有效性和针对性.

关键词：沥青道面性能预测粒子群算法灰色模型马尔可夫模型

A Protective Film Produced by Whey Protein for Photonic Crystals： Inspired by the Epidermis Structure of Chameleon

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Journal of Bionic Engineering 2018年第4期15卷 713-721页

作者： Xiaoyi Chen Hongbo Xu Lei Pan jiupeng zhao Yao Li Ying Song School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Center for Composite Materials and Structure Harbin Institute of Technology Harbin 150001 China

Self-assembly technology of sub-micrometer-sized colloidal particles is the most promising approach for the preparation of large-area Photonic Crystals （PCs）. However, PCs obtained by this method are facile to be destroyed by external factors such as friction, impact, and pollutants. The highly keratinized epidermis of chameleon skin acts as a protective role for the dermis with photon ceils of the tunable band-gap structure. Inspired by the epidermis structure of chameleon, we use whey protein to develop a sort of protective film on the surface of artificially synthesized PCs. The film possesses positive mechanical properties that make the PCs friction and impact re- sistant. In addition, favorable resistance to water and C02 could prevent PCs from being destroyed by pollutants. Consequently, PCs with protective film are well preserved when subjected to external factors （such as friction） and the optical properties of the PCs are successfully maintained, that may significantly promote the utilization of PCs in optical devices.

关键词： chameleon photonic crystal bioinspired protective film whey protein

Biomimetic Moth-eye Anti-reflective Poly-(methyl methacrylate)Nanostructural Coating

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Journal of Bionic Engineering 2019年第6期16卷 1030-1038页

作者： Hongbo Xu Liuting Gong Shoucai Zhang Renping Ma Lei Pan jiupeng zhao Yao Li MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Beijing Institute of Space Mechanics and Electricity Beijing 100094China Beijing Vocational College of Labour and Social Security Beijing 102200China Center for Composite Material Harbin Institute of TechnologyHarbin 150001China

This study reports a simple imprinting method for the fabrication of biomimetic moth-eye antireflective polymethyl methacrylate(PMMA)nanostructures on the surface of the substrate.The antireflection structured silicon was obtained by Reactive Ion Etching(RIE)method.By using the antireflection structured silicon substrate as the imprinting stamp,the biomimetic moth-eye polymer structures showed tapered holes,whose depth and periodicity were around 780 nm and 580 nm,respectively.The reflectance of the resulting PMMA structures was reduced from 10% to less than 1% in the wavelength range from 300 nm to 1600 nm.This simple methodology can be scaled up via self-loading and nanoimprinting,which may have a promising application in optoelectronic devices and solar cells.

关键词： nanoimprinting sub-wavelength structure antireflective biomimetic moth-eye

Recent advances in multifunctional electrochromic energy storage devices and photoelectrochromic devices

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Science China Chemistry 2017年第1期60卷 13-37页

作者： Zhongqiu Tong Yanlong Tian Hongming Zhang Xingang Li Junyi Ji Huiying Qu Na Li jiupeng zhao Yao Li College of Materials and Metallurgical Engineering Guizhou Institute of Technology Guiyang 550003 China Center for Composite Materials and Structure Harbin Institute of Technology Harbin 150001 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Guizhou Construction Science Research & Design Institute Limited Company of China State construction Engineering Corporation Guiyang 550006 China

Multifunctional devices integrated with electrochromism and energy storage or energy production functions are attractive because these devices can be used as an effective approach to address the energy crisis and environmental pollution in society today. In this review, we explain the operation principles of electrochromic energy storage devices including electrochromic supercapacitors,electrochromic batteries, and the photoelectrochromic devices. Furthermore, the material candidates and structure types of these multifunctional devices are discussed in detail. The major challenges of these devices along with a further outlook are highlighted at the end.

关键词：储能器件光电变色多功能设备电致变色能电存储设备能源危机能量存储

MgF_(2) as abundant and environmentally friendly electrolytes for high performance electrochromic devices

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Journal of Materiomics 2021年第6期7卷 1318-1323页

作者： Xi Chen Wenjie Li Shuliang Dou Lebin Wang Yingming zhao Xiang Zhang Yao Li jiupeng zhao Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin150001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin150001China

Electrochromic devices(ECDs)can regulate the indoor solar radiation by adjusting optical transmissive properties,showing great commercial potential and important social value of green energy saving.However,the unsafety and high cost of Li^(+) based electrolyte hinder the large-scale and industrialized production of ECDs.Other metal ions have been used as electrolyte ions,but they are rarely reported in all solid state ECDs.In this study,MgF_(2) film is used as the solid electrolyte to construct all solid state ECD with the structure of glass/ITO/WO_(3)/MgF_(2)/NiO/ITO.The ECD shows the large optical modulation(~83%at 820 nm,with 100 s durations)and fast response(19.2 s for bleaching and 8.3 s for coloring,with 25 s durations).Moreover,the ECD achieves the extreme transmittance value of colored states Tc=0%,which can give an absolute private state.This work not only indicates that MgF_(2) film can be an alternative to Lit based electrolyte in all solid state ECDs,but also broadens the applications of all solid state EC smart windows to private buildings.

关键词： Electrochromic All solid state Smart window