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A highly-efficient concentrated perovskite solar cell-thermoelectric generator tandem system

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Journal of Energy Chemistry 2021年第8期30卷 730-735,I0015页

作者： yangying zhou yanan Chen qi Zhang yu zhou Meiqian Tai Kunihito Koumoto Hong Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina Nagoya Industrial Science Research Institute 464-0819 NagoyaJapan Center of Nanotechnology King Abdulaziz University21589 JeddahSaudi Arabia

Concentrated photovoltaic(CPV)has been identified as an effective method to further enhance the efficiency of photovoltaic *** studies on CPV mainly focused on III-V multi-junction ***,Ⅲ-ⅤCPV technology is mainly used in niche applications due to its high ***,we use metal-halide perovskite solar cell(PSC)to demonstrate a concentrated photovoltaic-thermoelectric tandem *** thermoelectric generator(TEG)is utilized to reduce the effect of heat generation under concentrated solar *** tandem system achieved a peak power conversion efficiency(PCE)of 25.0%at a solar concentration of 3 *** efficiency exceeded that of the single PSC by~4.7%.Our work proves that by controlling the heat flow in concentrated PSC-TEG tandem system,the redundant heat produced by upper PSC can be effectively *** tandem structure provides a promising approach to improve the efficiency and stability of PSC under low-concentrated solar irradiation.

关键词： Concentrated PV-TEG tandem system Perovskite solar cell Thermal behavior Working stability

Low-temperature growth of stoichiometric aluminum nitride films prepared by magnetic-filtered cathodic arc ion plating

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Rare Metals 2016年第7期35卷 520-525页

作者： Wan-qi qiu Zhong-Wu Liu Ke-Song zhou School of Materials Science and Engineering South China University of Technology New Materials Research Department Guangzhou Research Institute of Nonferrous Metals

A1N films were prepared on Si（100） and quartz glass substrates with high deposition rate of 30 nm-min-I at the temperature of below 85 ℃ by the magnetic-filtered cathodic arc ion plating （FCAIP） method. The as-deposited A1N films show very smooth surface and almost no macrodroplets. The films are in amorphous state, and the formation of A1N is confirmed by Nls and A12p X-ray photoelectron spectroscopy （XPS）. The XPS depth profile analysis shows that oxygen is mainly absorbed on the A1N surface. The A1N film has A1 and N concentrations close to the stoichiometric ratio with a small amount of A1203. The prepared A1N films are highly transparent over the wave- length range of 210-990 nm. The optical transmission spectrum reveals the bandgap of 6.1 eV. The present technique provides a good approach to prepare large-scale A1N films with controlled structure and good optical properties at low temperature.

关键词： A1N film Stoichiometric ratio Binding energy Ion plating Filter

Comparison of the effects of Ti-and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite

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International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1705-1715页

作者： Guotao zhou yilin Wang Tiangui qi qiusheng zhou Guihua Liu Zhihong Peng Xiaobin Li School of Metallurgy and Environment Central South UniversityChangsha 410083China

Goethitic bauxite is a widely used raw material in the alumina *** is an essential prerequisite to clarify the effect of Ti-and Si-containing minerals on goethite transformation in the Bayer digestion process,which could efficiently utilize the Fe-and Al-containing minerals present in goethitic *** this work,the interactions between anatase or kaolinite with goethite during various Bayer digestion processes were investigated using X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),transmission electron microscopy (TEM),and scanning electron microscopy (SEM).The results showed that anatase and kaolinite hindered the transformation of *** exerted more significant effects than kaolinite due to the dense sodium titanate layer on the goethite surface after reacting with the sodium aluminate *** the reductant hydrazine hydrate could eliminate the retarding effect by inducing the transformation of goethite into *** this process,titanium was embedded into the magnetite lattice to form Ti-containing ***,the weakening of the interaction between magnetite and sodium aluminosilicate hydrate reduced the influence of *** a validation of the above results,the reductive Bayer method resulted in the transformation of goethite into goethitic bauxite with 98.87% relative alumina digestion *** obtained red mud with 72.99wt% Fe2O3could be further utilized in the steel *** work provides a clear understanding of the transformative effects of Ti-and Si-containing minerals on iron mineral transformation and aids the comprehensive use of iron and aluminum in goethitic bauxite subjected to the reductive Bayer method.

关键词： goethite magnetite kaolinite anatase Bayer digestion

Adaptive Reclosing Scheme Based on Traveling Wave Injection For Multi-Terminal dc Grids

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Energy Engineering 2023年第5期120卷 1271-1285页

作者： Peng Han Xinchen Zhao yannanWu Zhiyu zhou qi qi State Grid Beijing Electric Power Company Beijing100031China State Grid Beijing Tongzhou Electric Power Supply Company Beijing101101China State Key Laboratory of Alternate Electrical Power Systemwith Renewable Energy Sources North China Electric Power UniversityBeijing102206China

The hybrid dc circuit breaker(HCB)has the advantages of fast action speed and low operating loss,which is an idealmethod for fault isolation ofmulti-terminal dc ***-terminal dc grids that transmit power through overhead lines,HCBs are required to have reclosing capability due to the high fault probability and the fact that most of the faults are temporary *** avoid the secondary fault strike and equipment damage that may be caused by the reclosing of the HCB when the permanent fault occurs,an adaptive reclosing scheme based on traveling wave injection is proposed in this *** scheme injects traveling wave signal into the fault dc line through the additionally configured auxiliary discharge branch in the HCB,and then uses the reflection characteristic of the traveling wave signal on the dc line to identify temporary and permanent faults,to be able to realize fast reclosing when the temporary fault occurs and reliably avoid reclosing after the permanent fault *** test results in the simulation model of the four-terminal dc grid show that the proposed adaptive reclosing scheme can quickly and reliably identify temporary and permanent faults,greatly shorten the power outage time of temporary *** addition,it has the advantages of easiness to implement,high reliability,robustness to high-resistance fault and no dead zone,etc.

关键词： Multi-terminal dc grid hybrid dc circuit breaker adaptive reclosing fault type identification traveling wave reflection characteristic

Fabrication of nanoporous Ni and NiO via a dealloying strategy for water oxidation catalysis

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Journal of Energy Chemistry 2020年第11期29卷 125-134页

作者： Xiangrong Ren yiyue Zhai qi zhou Junqing yan Shengzhong Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina Materials Science and Engineering College Lanzhou University of TechnologyLanzhou 730050GansuChina

Nickel oxides and(oxy)hydroxides are promising replacements for noble-metal-based catalysts owing to their high activity and good long-term stability for the oxygen evolution reaction(OER). Herein, we developed nanoporous Ni by a method of combined rapid solidification and chemical dealloying. Subsequently,nanoporous Ni O was obtained via heating treatment, the macropore and skeleton sizes of the NiO originated from Ni10Al90 alloy are 100–300 nm and 80–200 nm, respectively. Benefiting from the multi-stage nanoporous structure and high specific surface area, the nanoporous NiO demonstrates an outstanding OER, reaching 20 mA cm-2 at an overpotential of 356 mV in 1 M KOH. The corresponding Tafel slope and apparent activation energy are measured to be 76.73 mV dec-1 and 29.0 kJ mol-1, respectively. Moreover,kinetic analysis indicates that the Ni O catalyst shows pseudocapacitive characteristics, and the improved current is attributed to the high-rate pseudocapacitive behavior that efficiently maintains increased nickel redox cycling to accelerate the reaction rates. After 1000 cycles of voltammetry, the overpotential of the NiO decreases by 22 mV(j = 10 mA cm-2), exhibiting excellent stability and durability.

关键词： Rapid solidification Dealloying Nanoporous Ni Electrocatalyst OER

The Coiling of Split Dandelion Scape Induced by Cell Hygroscopicity

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Acta Mechanica Solida Sinica 2021年第3期34卷 393-403页

作者： Chen Zhang Ting qiao Kenan zhou qi Zhang Meiying Hou Institute of Applied Mechanics College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Material Strength and Structural Impact Taiyuan University of TechnologyTaiyuan 030024China Institute of Physics Chinese Academy of SciencesBeijing 100080China

It is of great significance to study the water absorption and expansion of cells,which are essential for the growth and life regulation of plants,not only for understanding the complex life phenomena of plants,but also for the manufacture of biomimetic *** main purpose of this study is to shed light on the mechanism of a novel coiling phenomenon of the split dandelion scape soaked in water and the high concentration mannitol *** discovered that the difference between water absorption/dehydration capacities of inner cells and lateral cells of the split dandelion scape generates asymmetric expansion/contraction between inner and lateral layers,resulting two opposite coiled *** to the deformable hypothesis of the thermal expansion model,the water absorption-induced cell expansion model was proposed to explain the coiling process of the split dandelion *** the simulation and experimental results revealed that the coiling of dandelion scape is strongly depended on the response of cells to the stimulation of the solution *** considerable potential load bearing capacity of plants,the coiling phenomenon can be an inspiration to the designs of soft robots and bionic sensors for humidity control.

关键词： Dandelion scape Coiled pattern Cell hygroscopicity Asymmetric deformation Expansive material model

Electrolyte-gated SrCoO_(x) FET sensor for highly sensitive detecting pH in extreme alkalinity solution

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Nano Research 2024年第4期17卷 3079-3086页

作者： Han zhou Gaocan qi Wenbin Li yuhang Wang Zhihao yuan School of Materials Science and Engineering Tianjin Key Lab of Photoelectric Materials&Devicesand Key Laboratory of Display Materials and Photoelectric Devices(Ministry of Education)Tianjin University of TechnologyTianjin 300384China

The pH monitoring is significantly important in chemical industry,biological process,and pollution ***,it remains a great challenge to measure pH in extreme alkalinity ***,we employ an electrolyte-gated field-effect-transistor(FET)strategy using non-stoichiometric SrCoO_(x) with rich oxygen-vacancy defects as channel materials for detecting extreme *** corresponding channel can provide effective oxygen-ion-migration sites for reversible transformation of OH-↔O_(2)-+H^(+)driven by electric *** resultant electrolyte-gated FET sensor exhibits a sensitive linear response to high concentrations of alkaline solution,1–20 ***,the sensor has the ability to directly indicate the pH values ranging from 14.0 to 17.0 in consideration of ion-activity coefficient *** work offers a great possibility for directly detecting base concentration as well as pH values in extreme alkaline solutions.

关键词： field-effect-transistor(FET) pH sensor extreme alkaline solution SrCoO_(x) oxygen-ion migration

Feature-aided pose estimation approach based on variational auto-encoder structure for spacecrafts

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Chinese Journal of Aeronautics 2024年第8期37卷 329-341页

作者： yanfang LIU Rui zhou Desong DU Shuqing CAO Naiming qi Department of Aerospace Engineering Harbin Institute of TechnologyHarbin 150001China Suzhou Research Institute of HIT Suzhou 215104China Shanghai Institute of Spaceflight Control Technology Shanghai 201109China Shanghai Key Laboratory of Aerospace Intelligent Control Technology Shanghai 201109China

Real-time 6 Degree-of-Freedom(DoF)pose estimation is of paramount importance for various on-orbit *** from the development of deep learning,Convolutional Neural Networks(CNNs)in feature extraction has yielded impressive achievements for spacecraft pose *** improve the robustness and interpretability of CNNs,this paper proposes a Pose Estimation approach based on Variational Auto-Encoder structure(PE-VAE)and a Feature-Aided pose estimation approach based on Variational Auto-Encoder structure(FA-VAE),which aim to accurately estimate the 6 DoF pose of a target *** methods treat the pose vector as latent variables,employing an encoder-decoder network with a Variational Auto-Encoder(VAE)*** enhance the precision of pose estimation,PE-VAE uses the VAE structure to introduce reconstruction mechanism with the whole ***,FA-VAE enforces feature shape constraints by exclusively reconstructing the segment of the target spacecraft with the desired *** evaluation against leading methods on public datasets reveals similar accuracy with a threefold improvement in processing speed,showcasing the significant contribution of VAE structures to accuracy enhancement,and the additional benefit of incorporating global shape prior features.

关键词： Pose estimation Variational auto-encoder Feature-aided Pose Estimation Approach On-orbit measurement tasks Simulated and experimental dataset

Construction of bimetallic Pt-Pd/CeO_(2)-ZrO_(2)-La_(2)O_(3) catalysts with different Pt/Pd ratios and its structure-activity correlations for three-way catalytic performance

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Journal of Rare Earths 2023年第6期41卷 896-904,I0004页

作者： Kai Chen Jie Wan Ting Wang qi Sun Renxian zhou Institute of Catalysis Zhejiang UniversityHangzhou 310028China Energy Research Institute Nanjing Institute of TechnologyNanjing 211167China School of Environmental Engineering Nanjing Institute of TechnologyNanjing 211167China

A series of Pt-Pd bimetallic catalysts supported on CeO_(2)-ZrO_(2)-La_(2)O_(3) mixed oxides were synthesized through the conventional impregnation ***-way catalytic performance evaluations along with detailed physio-chemical characterizations were carried out to establish possible structure-activity *** show that on the one hand,different Pt/Pd ratios can strongly affect the TWC behaviors of Pt-Pd/CZL catalysts by modulating the synergistic effect between Pt and *** the other hand,higher Pt/Pd ratio also favors better dispersion of precious *** improved precious metals(PM)dispersion can promote the metal-support interaction and increase the surface oxygen vacancies concentration,thereby raising the dynamic oxygen storage/release capacity,improving the redox ability as well as enha ncing the thermal stability of the Pt-Pd/CZL ***,the stro ng metal-support interaction can augment surface oxygen vacancy concentration,thereby benefiting low temperature CO and NO reaction via augmented NOxadsorption and nitrate conversion.

关键词： Three-way catalyst Bimetallic Metal-support interaction Dispersion Dynamic oxygen storage/release capacity Rare earths