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science Bulletin 2024年第8期69卷 1050-1060页

作者：王海亮张啟先林则东刘慧丛魏晓震宋永发律春宇李卫平朱立群王科翔崔振华王兰林常青殷鹏刚宋廷鲁白阳陈棋杨世和陈海宁 School of Materials Science and Engineering Beihang UniversityBeijing 100191China Guangdong Provincial Key Lab of Nano-Micro Materials Research School of Advanced MaterialsShenzhen Graduate SchoolPeking UniversityShenzhen 518055China Institute of Biomedical Engineering Shenzhen Bay LaboratoryShenzhen 518107China School of Chemistry Beihang UniversityBeijing 100191China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China School of Internet of Things Engineering Jiangnan UniversityWuxi 214122China School of Physical Science and Technology Guangxi UniversityNanning 530004China Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China

Defects formed at the surface,buried interface and grain boundaries(GB)of CsPbI_(3)perovskite films considerably limit photovoltaic *** defects could be passivated effectively by the most prevalent post modification strategy without compromising the photoelectric properties of perovskite films,but it is still a great challenge to make this strategy comprehensive to different defects spatially distributed throughout the ***,a spatially selective defect management(SSDM)strategy is developed to roundly passivate various defects at different locations within the perovskite film by a facile one-step treatment procedure using a piperazine-1,4-diium tetrafluoroborate(PZD(BF_(4))_(2))*** small-size PZD^(2+)cations could penetrate into the film interior and even make it all the way to the buried interface of CsPbI_(3)perovskite films,while the BF_(4)^(-)anions,with largely different properties from I^(-)anions,mainly anchor on the film ***,virtually all the defects at the surface,buried interface and grain boundaries of CsPbI_(3)perovskite films are effectively healed,leading to significantly improved film quality,enhanced phase stability,optimized energy level alignment and promoted carrier *** these films,the fabricated CsPbI_(3)PSCs based on carbon electrode(C-PSCs)achieve an efficiency of18.27%,which is among the highest-reported values for inorganic C-PSCs,and stability of 500 h at 85℃with 65%efficiency maintenance.

关键词： CsPbI_(3) Defects Spatially selective defect management Carbon electrode

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The Comprehensive Understanding of Intrinsic Contribution of Nickel Foam as a Conductive Substrate in Water Splitting

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SSRN 2024年

作者： Rashid, Umair Zhu, Youqi Cao, Chuanbao Research Center of Materials Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Beijing Institute of Technology Beijing100081 China

Using nickel foam as a substrate for electrocatalyst to report overpotential in a manuscript is a popular method in electrochemical testing or water-splitting i.e., the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). However, use of coated Nickel foam as substrate methodology is, in essence, not reasonable for studying the intrinsic chemistry difference of electrocatalysts. To assess water-splitting devices, Ni-foam is a valid substrate if nanoparticles are grown uniformly;however, when drop-casted ink methodology is used or there is inhomogeneous growth of nanoparticles, it becomes difficult to determine whether a particular electrocatalyst is intrinsically active or not. In order to gain a rational understanding of the electrochemical activity and overpotential findings of a specific catalyst, it is essential to recognize the limitations of Ni-foam on reflecting its intrinsic role in electrocatalytic activity. Ni-foam is therefore should not be preferred as a conductive substrate during electrochemical testing (ET). On the contrary, use of other neutral substrates like carbon fiber paper (CFP) and glassy carbon electrode (GCE) should be employed. © 2024, The Authors. All rights reserved.

关键词： Electrocatalysts

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High-entropy(Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) with good high temperature stability,low thermal conductivity,and anisotropic thermal expansivity

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Journal of advanced Ceramics 2020年第5期9卷 595-605页

作者： Zifan ZHAO Huimin XIANG Heng CHEN Fu-Zhi DAI Xiaohui WANG Zhijian PENG Yanchun ZHOU Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China School of Engineering and Technology China University of GeosciencesBeijing 100083China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The critical requirements for the environmental barrier coating(EBC)materials of silicon-based ceramic matrix composites(CMCs)include good tolerance to harsh environments,thermal expansion matches with the interlayer mullite,good high-temperature phase stability,and low thermal ***-structured rare-earth aluminates RE_(4)Al_(2)O_(9) have been considered as candidates of EBCs for their superior mechanical and thermal properties,but the phase transition at high temperatures is a notable drawback of these *** suppress the phase transition and improve the phase stability,a novel cuspidine-structured rare-earth aluminate solid solution(Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) was designed and successfully synthesized inspired by entropy stabilization effect of high-entropy ceramics(HECs).The as-synthesized HE(Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) exhibits a close thermal expansion coefficient(6.96×10^(-6) K^(-1) at 300-1473 K)to that of mullite,good phase stability from 300 to 1473 K,and low thermal conductivity(1.50 W·m^(-1)·K^(-1) at room temperature).In addition,strong anisotropic thermal expansion has been observed compared to Y_(4)Al_(2)O_(9) and Yb_(4)Al_(2)O_(9).The mechanism for low thermal conductivity is attributed to the lattice distortion and mass difference of the constituent atoms,and the anisotropic thermal expansion is due to the anisotropic chemical bonding enhanced by the large size rare-earth cations.

关键词： (Nd_(0.2)Sm_(0.2)Eu_(0.2)Y_(0.2)Yb_(0.2))_(4)Al_(2)O_(9) high-entropy ceramics(HECs) environmental barrier coatings phase stability thermal properties

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The Comprehensive Understanding of Intrinsic Contribution of Nickel Foam as a Conductive Substrate in Water Splitting

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SSRN 2024年

关键词： Electrocatalysts

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Initiating Cationic-Anionic Chemistry with Stepwise Surface-to-Inner Conversion in Copper Selenide Superstructures for High-Energy Rechargeable Magnesium Batteries

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SSRN 2024年

作者： Du, Changliang He, Siru Yang, Lifen Liu, Xin Jiang, Rong Ma, Xilan Zhu, Youqi Zou, Meishuai Cao, Chuanbao Research Center of Materials Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Beijing Institute of Technology Beijing100081 China

Copper selenides are viewed as the most capable cathode materials for rechargeable magnesium batteries, yet suffer from unsatisfactory energy density due to their low operating voltage plateau (~0.9 V vs. Mg/Mg2+) and insufficient reversible capacity. Herein, a stepwise conversion from surface cationic-anionic redox to inside electrochemical displacement reaction is realized in copper selenide (Cu2-xSe) superstructure cathodes. A highly reversible high-voltage platform at ~1.6 V is discovered during discharge process. Ex-situ spectroscopy and microscopy results demonstrate that the high-voltage plateau is contributed by surface Cu2+ charge-carrier transformation and anionic Se2– redox reaction while sufficient inner Cu-Mg replacement conversion at low-voltage region. Following the favorable mechanism, the Cu2-xSe superstructure cathodes can present high specific capacity of 385.4 mAh g–1 at 0.1 A g–1 and outstanding energy density of 426.3 Wh kg–1. Moreover, the Cu2-xSe superstructure cathodes also maintain a reversible capacity of 223.6 mAh g–1 over 700 cycles with 0.0147% capacity degradation per cycle at 1.0 A g–1 and long-term charge-discharge lifetime for 3000 cycles at 5.0 A g–1. This research reports a new Mg2+ storage mechanism for copper selenide cathodes and provides novel route to develop high-energy-density rechargeable magnesium batteries. © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Fe-Doping Accelerated Magnesium Storage Kinetics in Rutile Tio2 Cathode Materials

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SSRN 2024年

作者： Zhang, Qianwei Liu, Xin Du, Changliang Jin, Mingwei Yang, Lifen Jiang, Rong Ma, Xilan Zhu, Youqi Cao, Chuanbao Zou, Meishuai Research Center of Materials Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Beijing Institute of Technology Beijing100081 China

Rutile titanium dioxide (TiO2) is theoretically favored as the efficient cathode materials for magnesium secondary batteries, yet rarely reported due to sluggish kinetics, low capacity, and inferior reversibility. Herein, a defect engineering strategy is developed via cationic Fe-doping to enhance the electrochemical magnesium storage kinetics of the rutile TiO2 cathode materials and achieve the surface Mg2+ adsorption/diffusion mechanism. Abundant oxygen vacancies can be generated by Fe cations in rutile TiO2 via a molten salt flux method. The optimized rutile TiO2 cathode materials show large specific capacity of 204.8 mAh g−1 at current density of 100 mA g−1, higher than that of the TiO2-based counterparts reported previously. Additionally, the Mg2+ diffusion coefficient of Fe-doped rutile TiO2 cathode materials are significantly improved to enable rapid magnesium storage. Fe cations can activate the cathode surface and weaken the Coulombic interactions between Mg2+ and anions in the host material. Oxygen vacancies can provide active adsorption sites for Mg2+ and MgCl+ to avoid slow solid-state diffusion and thus accelerate magnesium storage kinetics. Ex-situ XRD and XPS indicate that Fe-doped rutile TiO2 cathode materials undergo the energy storage mechanism of Mg2+ adsorption/diffusion without phase transition or significant lattice expansion. © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Microwave Assisted Synthesis of Cobalt-Doped Copper Selenite Nanorice as Bifunctional Electrocatalyst for Overall Water Splitting

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SSRN 2024年

In the research and development of noble-metal free catalysts, copper-based materials such as copper selenite have shown interest as electrocatalysts to drive the oxygen evolution reaction (OER) in basic medium, however their Hydrogen evolution reaction (HER) activity is still unexplored. Therefore, we have performed the synthesis of cobalt doped copper selenite nanoparticles which can robustly and effectively do electrocatalysis for both the OER and HER in basic medium electrolyte. The novelty lies in the fact that microwave synthesis procedure utilizing oxidizing agent as a key precursor is entirely new, this particular material was never employed in water splitting and catalyst need very low amount of binder. The results revealed that cobalt doped copper selenite have a relatively lower starting potential and a higher current density due to the synergistic effects of a large active area, quick charge, mass transport, and a three-dimensional conducting path, having OER and HER overpotentials of 365 mV and 226mV at 10 mA/cm2 current densities, respectively. We found a novel doped structure featuring porous surfaces and distinctive rice like morphology which facilitate an efficient electron transportation during the water splitting thereby illustrating an exceptional performance of this system along with rapid synthesis and lower costs. © 2024, The Authors. All rights reserved.

关键词： Copper

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Wo3-Vs4 Core-Shell Structured Cathode for High-Performance Rechargeable Magnesium Battery System

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SSRN 2024年

作者： Naseem, Muhammad Kashif Azmat, Mian Abbas, Sadia Ismail, Muhammad Jin, Mingwei Hajra, Hajra Shoaib, Saba Ali, Asif Khalid, Syed Zhu, Youqi Cao, Chuanbao Zou, Meishuai Research Center of Materials Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Beijing Institute of Technology Beijing100081 China

Vanadium tetra Sulfide (VS4) is facing sluggish diffusion kinetics caused by divalent Magnesium (Mg2+) ion, despite having an ideal two-dimensional layer structured cathodic material for rechargeable magnesium battery system. To address this problem, WO3-VS4 core-shell structures with percolation network presented, aiming to facilitate Mg2+ ions diffusion to achieve higher performances and improved discharge voltage along with maintaining the structural integrity of cathodic material during cycling. WO3 backed VS4 exhibited interfacial stability due to charge accumulation at interface causing expanded layers of VS4, facilitated the insertion of Mg2+ ions, improved charge transferability and conductivity, hence enabled higher specific capacity and rate performance. Calculated formation energies justified the stability of this cathodic structure, therefore demonstrated up to 75.97% diffusion contribution. Bandgap measurements, Density of states analysis and energy bands calculations at interface reinforced this claim by clarifying the charge transfer phenomenon. Compared with pristine VS4 at 1.57V, the highest discharge voltage of WO3-VS4 appeared at 1.98V and exhibited up to 633.5 mAhg-1 capacitance at 100 mAg-1 current density because of schematic compatibility, interfacial stability and limiting side reactions in RMBS. The interface of WO3-VS4 at copper current collector exhibited extraordinary performances as the step forward to resolve long-standing obstacle of sluggish kinetics. © 2024, The Authors. All rights reserved.

关键词： Shells (structures)

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Zinc Stannate Nanostructures for Energy Conversion

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Chinese Journal of Chemistry 2021年第2期39卷 367-380页

作者： Jie Dou Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing100081 China Beijing Institute of Technology Chongqing Innovation Center Chongqing 4004100Beijing100081 China

To date,ternary metal oxide semiconductor materials have attracted extensive attention worldwide due to their unique optoelectronic *** a classical ternary oxide,Zn2SnO4 is featured with the high electron mobility,wide band gap,negligible visible light absorption and tailorable electronic band ***,it is an ideal material for practical use in solar cells,lithium batteries,sensors,and *** this review,we summarize the recent research progress of this material with the focus on the synthesis methods,nanostructures,and the resulting effects on the crystal structure,optical properties,and photoelectrochemical ***,their potential applications in different devices are highlighted and carefully discussed.

关键词： Zinc stannate Synthesis design Nanostructures Applications Energy conversion

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Low Temperature Sintering of High Performance Al2O3/ZrO2 Nanocomposite Ceramics

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SSRN 2023年

作者： Liu, Xudong Yuan, Yuchen Wang, Renjie Zhu, Shiyang Bai, Yuelei Fang, Canqing Chen, Ce Zheng, Yongting National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Centre for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

In this work, amorphous/solid solution Al2O3/ZrO2 powder was prepared by combustion synthesis assisted with rapid cooling in water, followed by grinding for further refinement. The solubility of Al2O3 in the ZrO2 lattice was greatly enhanced by the rapid cooling process in water. The transformation of the metastable state and the presence of oxygen vacancies in the powder can accelerate the mass transfer during sintering, allowing for the preparation of nearly fully densified ceramics through hot press sintering at temperatures as low as 1300°C. During sintering, large numbers of ultra-fine nanoparticles (~5 nm) were precipitated from the solid solution and evenly dispersed throughout the matrix. The nanoparticles exhibit a high degree of coherence with the matrix due to the similarities in crystal structure between t-ZrO2 and α-Al2O3. The nanoparticle reinforcement effect and t-m phase transformation of ZrO2 both contributed to the ceramics' excellent mechanical properties. To compare the sintering capabilities and the performance of the ceramics, commercial powders were also sintered at the same temperature. This research may offer a new instruction for the low temperature fabrication of nanoparticles-strengthened ceramics. © 2023, The Authors. All rights reserved.

关键词： Solid solutions

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