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Identifying the dynamic behaviors in complete reconstruction of Co-based complex precatalysts during electrocatalytic oxygen evolution

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Journal of Energy Chemistry 2025年第1期100卷 226-233页

作者： Jingfang Zhang Danyang Wu Linke Cai Youluan Lu fanpeng Cheng Lijuan Shi Qun Yi Yao Liu Yi Huang Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Hubei Key Laboratory of Novel Reactor and Green Chemical Technology School of Chemical Engineering & Pharmacy Wuhan Institute of Technology Key Laboratory of Pesticide & Chemical Biology of Ministry of Education Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of Education College of Chemistry Central China Normal University College of Materials Science and Engineering Fuzhou University

Transition metal-based nanomaterials have emerged as promising electrocatalysts for oxygen evolution reaction（OER）. Considerable research efforts have shown that self-reconstruction occurs on these nanomaterials under operating conditions of OER process. However, most of them undergo incomplete reconstruction with limited thickness of reconstruction layer, leading to low component utilization and arduous exploration of real catalytic mechanism. Herein, we identify the dynamic behaviors in complete reconstruction of Co-based complexes during OER. The hollow phytic acid（PA） cross-linked CoFe-based complex nanoboxes with porous nanowalls are designed because of their good electrolyte penetration and mass transport ability, in favor of the fast and complete reconstruction. A series of experiment characterizations demonstrate that the reconstruction process includes the fast substitution of PA by OH-to form Co（Fe）(OH)xand subsequent potential-driven oxidation to Co（Fe）OOH. The obtained CoFeOOH delivers a low overpotential of 290 mV at a current density of 10 mA cm-2and a long-term *** experiment results together with theory calculations reveal that the Fe incorporation can result in the electron rearrangement of reconstructed CoFeOOH and optimization of their electronic structure,accounting for the enhanced OER activity. The work provides new insights into complete reconstruction of metal-based complexes during OER and offers guidelines for rational design of high-performance electrocatalysts.

关键词： Oxygen evolution reaction

Investigation of the Oscillations in a Flare-productive Active Region

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Research in Astronomy and Astrophysics 2022年第10期22卷 180-188页

作者： fanpeng Shi Zongjun Ning Dong Li Key Laboratory of Dark Matter and Space Science Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210033China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

We investigate the oscillations in active region(AR)NOAA 12891,which produces a C2.0 three-ribbon flare accompanying a jet on 2021 November *** the data from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory,the 5 minutes decayless kink oscillations of coronal loops were detected and they are independent of the solar *** on the observed oscillations and seismological diagnostics,we estimate that the Alfvén speed and magnetic field in these coronal loops are around 466 kms^(-1) sand 7.6 G,***,the flare-related jet shows its plasmoids with 1 minute periodicity same as the intensity fluctuation of nearby flare *** correlation between the intensity fluctuation of jet and that of flare ribbon indicates that their 1 minute oscillations should originate from the same reconnection process.

关键词： Sun activity-Sun oscillations-Sun UV radiation Online material animation

Understanding of the structural evolution of catalysts and identification of active species during CO_(2) conversion

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Chinese Chemical Letters 2024年第4期35卷 17-30页

作者： Li Li fanpeng Chen Bohang Zhao Yifu Yu Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin 300072China

Converting CO_(2) into value-added chemicals and fuels through various catalytic methods to lower the atmospheric CO_(2) concentration has been developed to be a crucial means to alleviate the energy shortage and ameliorate the ever-fragile environment status. However, the complexity of the CO_(2) conversion reaction and the strong reduction conditions lead to the inevitable structural evolution, making it difficult for the prior design of suitable catalytic materials. Herein, to guide the rational design of efficient catalysts,we will be centered on the thermal, electro, and photo-induced structural evolution and active species identification during the CO_(2) conversion, including the in situ/operando characterization techniques monitoring the activation, steady, and deactivation stage of the catalysts as well as the inherent restructuring mechanism towards active species. Besides, the future challenges and opportunities on the merits of combining the structural evolution with the adsorbed intermediates recognized by ultra-fast spectroscopic techniques, simultaneously, the combination of theoretical simulation and the results of in situ experiments will also be addressed. This review can not only guide the identification of real active species, but also provide an approach to design the specific active species towards CO_(2) conversion, rather than only focusing on activity, for the purpose of practical industrial application.

关键词： CO_(2) Structural evolution Active species In situ Operando

A WO3-CuWO4 nanostructured heterojunction for enhanced n-butanol sensing performance

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Chinese Chemical Letters 2020年第5期31卷 1114-1118页

作者： fanpeng Duanmu Qian Liu Shuhui Zhong Huiming Ji Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin UniversityTianjin 300350China School of Mathematics Tianjin UniversityTianjin 300350China

Herein,a WO3-CuWO4 nanostructured heteroj unction was prepared by a facile two-step hydrothermal *** is composed of a WO3 square microplate and CuWO4 ***,the gas sensing properties were investigated under optimal operating temperature(120℃).The WO3-CuWO4 heterostructure shows good sensing performance towards n-butanol,with a response value up to 9.4 to towards 30 ppm n-butanol,and the response value is about 3 times higher than that of pristine *** detection limit for n-butanol is 0.1 ppm,which indicates a potential application in lower concentration ***,the response time of Wo3-CuWO4 nanostructured hete rojunction and the pristine WO3 are 21 s and 240 s respectively,revealing that there is a faster gas sensing process in the heterostructure.A possible sensing mechanism was then proposed on the basis of experimental data and band structure *** significant enhancement of WO3-CuWO4 heterostructure could be attributed to the formation of heterojunction,which brings electronic sensitization and electron transport pathway *** work offered a kind of novel and cost-effective sensing materials,and inspired more novel devices based on nanostructured heterojunction mechanism.

关键词： Gas sensor Tungsten oxide Copper tungstate Nanostructured heterojunction Nanoparticle n-Butanol

Enhanced Ethylene Production from Electrocatalytic Acetylene Semi-hydrogenation Over Porous Carbon-Supported Cu Nanoparticles

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Transactions of Tianjin University 2024年第4期30卷 297-304页

作者： Li Li fanpeng Chen Bo-Hang Zhao Yifu Yu Institute of Molecular Plus Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China

Electrocatalytic semi-hydrogenation of acetylene(C_(2)H_(2))over copper nanoparticles(Cu NPs)offers a promising non-petroleum alternative for the green production of ethylene(C2H4).However,server hydrogen evolution reaction(HER)competition in this process prominently decreases C2H4 selectivity,thereby hindering its practical ***,a Cu-based composite catalyst,wherein porous carbon with nanoscale pores was used as a support,is constructed to gather the C_(2)H_(2) feedstocks for suppressing the undesirable *** a result,the as-prepared catalyst exhibited C_(2)H_(2) conversion of 27.1%and C_(2)H_(4) selectivity of 88.4%at a C2H4 partial current density of 0.25 A/cm^(2) under optimal−1.0 V versus reversible hydrogen electrode(RHE)under the simulated coal-derived C_(2)H_(2) atmosphere,significantly outperforming the single Cu NPs *** addition,a series of in situ and ex situ experimental results show that not only the porous nature of the carbon support but also the stabilized Cu^(0)–Cu^(+) dual active sites through the strong metal–support interactions enhance the adsorption capacity of C_(2)H_(2),leading to high C_(2)H_(2) partial pressure,restraining the HER and thus improving the C2H4 selectivity.

关键词： Electrocatalysis Cu-based catalyst Hydrogenation Ethylene Selectivity

Physical effect of cloud seeding revealed by NOAA satellite imagery

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Chinese Science Bulletin 2005年第1期50卷 44-51页

作者： YUXing DAIJin LEIHengchi XUXiaohong fanpeng CHENZhengqi DUANChanghui WANGYong MeteorologicalInstituteofShaanxiProvince Xi'an710015China InstituteofAtmosphericPhysics ChineseAcademyofSciencesBeijing100029China CenterofWeatherModificationofShaanxiProvince Xi'an710015China MeteorologicalBureauofXianyang Xianyang712000China

From 0615 to 0749 UTC, 14 March 2000, a precipitation enhancement operation with AgI using an air- craft was conducted at the middle part of Shaanxi Province, China. 80 min after cloud seeding (0735 UTC), NOAA-14 satellite data showed a vivid zigzag cloud track on the satel- lite image. Its length is 301 km, and its average and maxi- mum width are 8.3 and 11 km. The cloud track is very simi- lar in shape with, but different in position and width from that of cloud seeding line. In order to determine that the cloud track is indeed caused by cloud seeding, a three-dimensional numerical model of transport and diffu- sion of seeding material is used to simulate the shape of seeding material concentration distribution, the turning points, width and length of seeding line. The simulated re- sults are compared with the features of cloud track at 0735 UTC. Every segment of the cloud track is consistent with the transport and diffusion of every segment of seeding line. The transport position, length, width and the variation trend of seeding line agree with those of cloud track. All suggest that the cloud track is the direct physical reflection of cloud seed- ing effect on the cloud top, which can respond to the trans- port and diffusion of seeding material. For this study case, the main effecting duration for every segment of seeding line is from 20 to 80 min, the time for each segment of seeding line diffusing to the maximum width is from about 50 to 70 min. This time is obtained from the appearing and disap- pearing time, width variation of the cloud track segments and simulated results. Also, the comparisons demonstrate that the numerical model of transport and diffusion can simulate the main characteristics of transport and diffusion of seeding material, and the simulating results are sound and trustworthy.

关键词：物理效应人工降雨 NOAA 人造卫星云迹数字模拟

Mechanistic insight into the controlled synthesis of metal phosphide catalysts from annealing of metal oxides with sodium hypophosphite

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Nano Research 2022年第12期15卷 10134-10141页

作者： fanpeng Chen Bohang Zhao Mengyao Sun Cuibo Liu Yanmei Shi Yifu Yu Bin Zhang Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin UniversityTianjin300072China

Understanding and manipulating synthetic progress for precisely controlling the components and defects of nanomaterials is an important and challenging task in materials synthesis and *** phosphides(MPs)have been explored as cheap advanced materials in various catalytic *** materials are usually synthesized through gas-solid phosphorization reaction in a trial-to-error manner,but their formation mechanism and the origin of controlled synthesis remain ***,we combine in situ thermogravimetrc analysis-mass spectrometry(TG-MS)and quasi-in situ X-ray powder diffraction(XRD)analysis to probe the transformation mechanism from metal oxides(MOs)to MPs during the phosphorization process mediated by ***,time,and the amount of hypophosphite are revealed as the driven forces while oxophilicity and crystallinity as the impeded forces,simultaneously control the component and defect level of a series of MP(M=Ni,Co,W,Mo,and Nb).The as-obtained WO2.9/WP is proved to be an efficient Z-scheme photocatalyst for oxidative coupling of methane with the total C2+production and C2H4 selectivity in C2+products reaching 10.75 pmolg-1 and 98.25%.Our work provides a fundamental understanding of the phosphorization treatment and thereby guides a viable synthetic route to the controlled synthesis of MOx-δ,MP,MOx-δ/MP,and MP/M heterostructured materials.

关键词： phosphorization treatment metal phosphides methodology heterostructure oxygen vacancy photocatalysis

Uncovering the degradation mechanism induced by ion-diffusion kinetics in large-format lithium-ion pouch cells

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Journal of Energy Chemistry 2023年第8期83卷 98-105,I0005页

作者： Shi Zhou Xiaohong Zhang Cong Chen Ming Chen fanpeng Kong Yingjie Qiao Jiajun Wang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001HeilongjiangChina Chongqing Research Institute of Harbin Institute of Technology Chongqing 401135China

Battery electrochemistry in an actual cell is a complicated behavior influenced by the current density,uniformity,and ion-diffusion distance,*** anisotropism of the lithiation/delithiation degree is usually inevitable,and even worse,due to a trend of big-size cell design,typically such as 4680 and blade cells,which accelerated a battery failure during repeat lithiation and delithiation of *** by that,two big-size pouch cells with big sizes,herein,are selected to reveal the ion-diffusion dependency of the cathodes at different ***,we find that the LiCoO_(2) pouch cell exhibits ~5 A h loss after 120 charge-discharge cycles,but a 15 A h loss is verified in a LiNixMnyCO_(1-x)-yO_(2)(NCM) ***-based imaging analysis indicates that higher ion-diffusion rates in the LiCoO_(2)than that in the LiNixMnyCO_(1-x)-yO_(2)is the determined factor for the anisotropic cathode fading,which is responsible for a severe mechanical issue of particle damage,such as cracks and even pulverization,in the cathode ***,we verify the different locations at the near-tab and bottom of the electrode make it worse due to the ion-diffusion kinetics and temperature,inducing a spatially uneven electrochemistry in the big-size pouch *** findings give an in-depth insight into pouch cell failure and make a guideline for high-energy cell design and development.

关键词： Ah-level lithium-ion pouch cells Cathode materials lon-diffusion kinetics X-ray tomography

Promoting nitric oxide electroreduction to ammonia over electron-rich Cu modulated by Ru doping

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Science China Chemistry 2021年第9期64卷 1493-1497页

作者： Jiangwei Shi Changhong Wang Rong Yang fanpeng Chen Nannan Meng Yifu Yu Bin Zhang Department of Catalysis Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Institute of Molecular Plus School of ScienceTianjin UniversityTianjin300072China

Electrocatalytic nitric oxide(NO)reduction is a promising strategy to produce *** a facile approach to synthesize efficient catalysts with enhanced NO electroreduction performance is highly ***,a series of Ru-doped Cu materials are constructed through in situ electroreduction of corresponding metal *** optimized Ru_(0.05)Cu_(0.95)exhibits superior electrocatalytic performance for ammonia synthesis by using NO/Ar(1/4,n/n)as the feedstocks(Faradaic efficiency:64.9%,yield rate:17.68μmol cm^(-2)h^(-1)),obviously outperforming Cu counterpart(Faradaic efficiency:33.0%,yield rate:5.73μmol cm^(-2)h^(-1)).Electrochemical in situ Fourier transform infrared(FTIR)spectroscopy and online differential electrochemical mass spectrometry(DEMS)are adopted to detect intermediates and unveil the possible reaction *** downshift of the Cu d-band center induced by Ru doping facilitates the rate-limiting hydrogenation step and decreases the desorption energy of NH_(3),leading to high Faradaic efficiency and yield of ammonia.

关键词： Electrocatalysis NO ammonia synthesis in situ characterizations Ru-doped Cu