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Bimetal-organic framework-derived carbon nanocubes with 3D hierarchical pores as highly efficient oxygen reduction reaction electrocatalysts for microbial fuel cells

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Science China materials 2021年第12期64卷 2926-2937页

作者： Neng Chen Zihan Meng Rui Wang Shichang Cai Weibin Guo Haolin Tang Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Noble metal-free and highly efficient electrocatalytic materials with hierarchically porous structures continue to be studied for the oxygen reduction reaction(ORR) in microbial fuel cells(MFCs). We report bimetal-organic framework(bi-MOF)-derived nanocubic Swiss cheese-like carbons with a novel three-dimensional hierarchically porous structure(3D Co-N-C) prepared by utilizing cetyltrimethylammonium bromide(CTAB) as a structure-directing agent to control the formation of a nanocubic skeleton, and silica spheres as a template to form a mesoporous structure. The elemental composition and chemical morphology of this material can be tuned through the Zn/Co ratio to optimize its ORR catalytic activity. The optimized 3D Co-N-C displays excellent ORR catalytic performance(half-wave potential as high as 0.754 V vs. reversible hydrogen electrode and diffusion-limiting current density of 5.576 mA cm^(-2)) in 0.01 mol L^(-1) phosphate-buffered saline(PBS electrolyte),showing it can compete with the commercial 20 wt% Pt/C catalysts. The catalytic capability and long-term durability of 3D Co-N-C as an air-filled cathode electrocatalyst in an MFC device are tested, showing that the 3D CoNC-MFC can reach a high power density of 1257 mW m^(-2) and provide a competitive voltage during a periodic feeding operation for 192 h;these values are much higher than those of the Pt/C-MFC.

关键词： Co-N-doped carbon structure-oriented approach 3D hierarchically porous nanocubes oxygen reduction reaction microbial fuel cells

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Microstructure and Oxidation Resistance of V Thin Films Deposited by Magnetron Sputtering at Room Temperature

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Journal of Wuhan University of technology(materials Science) 2020年第5期35卷 879-884页

作者： ZHANG Song ZHANG Ziyu LI Jun TU Rong SHEN Qiang WANG Chuanbin LUO Guoqiang ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China National Key Laboratory for Shock Wave and Detonation Physics Institute of Fluid PhysicsMianyang 621900China

Vanadium films were deposited on Si(100)substrates at room temperature by direct current(DC)magnetron *** microstructure and surface morphology were studied using scanning electron microscopy(SEM)and atomic force microscope(AFM).The oxidation resistance of films in air was studied using X-ray photoelectron spectroscopy(XPS)and transmission electron microscopy(TEM).The results showed that the amorphous vanadium film with a flatter surface had higher oxidation resistance than the crystalline film when exposed to *** rapid formation of the thin oxide layer of amorphous vanadium film could protect the film from sustained oxidation,and the relative reasons were discussed.

关键词： vanadium films magnetron sputtering sputtering power(Ps) microstructure oxidation resistance

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Enhancing the Humidity Resistance of Perovskite Photovoltaics: Comprehensive PbI2 Management Utilizing Long-Chain Ionic Liquid

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SSRN 2024年

作者： Sun, Yonggui Wang, Fei Lu, Lu Wang, Taomiao Yang, Guo Liang, Xiao Zhou, Xianfang Sun, Xiaokang Li, Qiannan Li, Yongjun Zhang, Fan Duan, Dawei Zhu, Jiajie Zhu, Quanyao Hu, Ruiyuan Yuan, Mingjian Hu, Hanlin Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University 7098 Liuxian Boulevard Shenzhen518055 China Nanjing University of Posts and Telecommunications Nanjing210023 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan China Shenzhen University China College of Chemistry Nankai University Tianjin China

Effectively managing residual PbI2 in two-step perovskite fabrication, while simultaneously enhancing the device performance, especially its humidity stability, poses a significant challenge. Herein, we introduced a novel ionic liquid (IL) molecule, long-chain alkane-based 1-octyl-3-methylimidazolium chloride (OMIMCl), with excellent hydrophobicity to regulate the perovskite conversion process, aiming to enhance the performance of resulting perovskite solar cells. The introduction of OMIMCl contributes to the formation of a uniform porous PbI2 film, facilitating comprehensive penetration of the second-step organic salt to fully convert PbI2 into perovskite material. Interestingly, nearly no residual PbI2 clusters are observed at both the top and bottom surfaces of OMIMCl-modified perovskite films. Meanwhile, depth-resolved grazing incidence wide-angle x-ray scattering (GIWAXS) measurements have quantitatively demonstrated the reduction of PbI2 in OMIMCl-modified perovskite thin films. Notably, the incorporation of OMIMCl retards the growth rate of perovskite crystals efficiently, thereby assisting in generating high-quality of perovskite films with larger grain size. Moreover, density functional theory (DFT) calculations of binding energy numerically demonstrate the hydrophobic property of IL OMIMCl, which plays a crucial role in improving the humidity stability of PSCs, as evidenced by direct water-dipping test. Consequently, we achieved a champion power conversion efficiency (PCE) of 24.72% and significantly improved long-term stability. © 2024, The Authors. All rights reserved.

关键词： Lead compounds

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The Influence of Alkaline Earth Elements on Electronic Properties ofα-Si3N4 via DFT Calculation

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Journal of Wuhan University of technology(materials Science) 2020年第5期35卷 863-871页

作者： ZHANG Jianwen HUANG Zhifeng YIN Ziqian LI Meijuan CHEN Fei SHEN Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China

We used density functional theory(DFT)calculations to study the influence of alkali earth metal element(AE)doping on the crystal structure and electronic band structure ofα-*** diversity of atomic radii of alkaline earth metal elements results in structural expansion when they were doped into theα-Si3N4 *** energies of the doped structures indicate that dopants prefer to occupy the interstitial site under the nitrogen-deficient environment,while substitute Si under the nitrogen-rich environment,which provides a guide to synthesizingα-Si3N4 with different doping types by controlling nitrogen *** electronic structures,energy levels of the dopants appear in the bottom of the conduction band or the top of the valence band or the forbidden band,which reduces the bandgap ofα-Si3N4.

关键词： first-principles density functional theory calculations alkaline earth elements dopedα-Si3N4 photoluminescence material crystal structure electronic structure

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Discovering the Role of Moisture in Spray-Coating High-Quality Perovskite Films Under Ambient Conditions

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SSRN 2023年

作者： Yu, Xinxin Mo, Yanping Li, Jing Ku, Zhiliang Xiao, Junyan Long, Fei Han, Liyuan Peng, Yong Cheng, Yi-Bing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China College of Materials Science and Engineering Guilin University of Technology Guangxi Guilin541004 China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China

The effect of moisture on the crystallization and morphological control of spray-prepared Cs0.19FA0.81PbI2.5Br0.5 perovskite films is elucidated. Moisture in air functions to (1) enhance droplet spreading as a result of humidity-suppressed solvent evaporation;(2) solvate organic salts in conjunction with added water in the precursor solution to facilitate the penetration of organic salts into inorganic halide films and accelerate their interaction. These conjunct contributions, on the one hand, relieve inhomogeneous solute distribution and suppress the "coffee-ring effect", on the other hand, promote phase transition and improve the crystallinity of resultant perovskite, ultimately enabling the formation of high-quality Cs0.19FA0.81PbI2.5Br0.5 perovskite films with homogeneous morphology and good crystallization. The power conversion efficiency (PCE) of the champion perovskite solar cell increases from 18.25% to 19.74%, with improved thermal stability, maintaining 80% of its initial efficiency after operating at 50 °C for >800 h. The large-area perovskite film (10 × 10 cm2) exhibits significant uniformity over the entire film, and the corresponding devices exhibit high consistency and reproducibility. The average PCE of small-area devices employing the same large-area perovskite film is 19.53±0.25%. Mini-modules with an active area of 64.8 cm2 yield an optimal PCE of 16.75%, with an average PCE of 16.08±0.32%. © 2023, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Tellurium Filled Carbon Nanotubes Cathodes for Li-Te Batteries with High Capacity and Long-Term Cyclability

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SSRN 2023年

作者： Rao, Shaoqing Wu, Ruizhe Zhu, Zhu Wu, Jinsong Ding, Yao Mai, Liqiang School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules College of Chemistry and Chemical Engineering Hubei University Wuhan430062 China

Li-Te batteries, compared with traditional lithium-ion batteries and Li-other group VIA elements (including O, S, Se) batteries, have shown overwhelming features of high specific volumetric capacity and superior electrical conductivity. These features make the Li-Te batteries possess great importance in modern portable electronics and electric vehicles with limited battery package size. However, the Achilles' Heel in Li-Te batteries is the huge volume change and inevitable shuttle effect of polytellurides during cycling. Herein, we synthesize a cathode material based on polycrystalline Te encapsulated in N-doped multiwall carbon nanotubes (Te-filled CNTs) by physical vapor transport (PVT) method. With unique spatial restriction of the CNT hosts, the electrochemically active Te content can be well preserved, and the prepared Te-filled CNTs cathodes deliver a high specific capacity of 590 mAh g-1 based on Te content. More importantly, the reaction kinetics and electrochemical reversibility of the cathodes have been significantly improved by using nanoscale cavities (4-6 nm) by which the polytellurides are stabilized. Meanwhile, a series of in situ Raman, XRD and TEM characterizations are carried out to reveal a two-step discharge/charge mechanism for Te-filled CNTs, which is the key for the excellent cycling stability. In addition, theoretical calculations prove that the encapsulated Te ensure a lower energy barrier for lithiation compared with bare CNT. This work sheds light on the nanoconfinement effect of CNT for improving the utilization and cycling stability of Te in Li-Te batteries, and provides a new strategy of designing high-performance group VIA element based cathodes. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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Direct orientational epitaxy of wafer-scale 2D van der Waals heterostructures of metal dichalcogenides

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National Science Review 2025年第5期 315-324页

作者： Shenghong Liu Ke Qin Jiashu Yang Tao Hu Hao Luo Jingsong Wu Zhen Cui Taotao Li Feng Ding Xinran Wang Yuan Li Tianyou Zhai State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology School of Materials Science and Engineering Xi'an University of Technology Suzhou Laboratory State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of Technology School of Integrated Circuits Nanjing University Research Institute of Huazhong University of Science and Technology in Shenzhen

Two-dimensional（2D） van der Waals（vdW） heterostructures have emerged as a groundbreaking candidate for future integrated circuits due to their tunable band structures,atomically sharp interfaces and seamless compatibility with complementary metal-oxide-semiconductor *** their promise,existing synthesis methods,such as mechanical transfer and vapor-phase conversion,struggle to achieve the high-quality,scalable production for practical *** response to these longstanding challenges,our study unveils for the first time the direct epitaxial growth of wafer-scale 2D vdW heterostructures（MoS2/SnS2） with exceptional quality and *** achievement is made possible through fundamentally enhancing the adsorption interactions between intermediates and the underlying *** heterostructures display pristine,defect-free interfaces,consistent crystal orientation and wafer-level thickness *** Raman peak shifts of MoS2and SnS2are constrained to below 0.5 cm-1across the entire wafer,with intensity deviations maintained within an impressive 2%,and thickness uniformity surpassing 99.5%.Owing to their exceptional crystallinity and interface quality,the heterostructures demonstrate extraordinary electron and hole transfer capabilities,showcasing a prominent rectification effect and an astounding responsivity of 6.28 ± 10～3 A/W,averaged from 30 *** study signifies a pivotal advancement for the integration of 2D materials into semiconductor technologies,paving the way for next-generation integrated circuits.

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Non-equivalent D-A copolymerization strategy towards highly efficient polymer donor for polymer solar cells

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Science China Chemistry 2021年第6期64卷 1031-1038页

作者： Ziya Shang Liuyang Zhou Chenkai Sun Lei Meng Wenbin Lai Jinyuan Zhang Wenchao Huang Yongfang Li Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 455001China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528216China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

D-A copolymerization is a broadly utilized molecular design strategy to construct high efficiency photovoltaic materials for polymer solar cells(PSCs),and all the D-A copolymer donors reported till now are the alternate D-A copolymers with equal D-and ***,we first propose a non-equivalent D-A copolymerization strategy with unequal D-and A-units,and develop three novel non-equivalent D-A copolymer donors(PM6-D1,PM6-D2 and PM6-D3 with D/A unit ratio of 1.1:0.9,1.2:0.8 and1.3:0.7,respectively)by inserting more D units into the alternate D-A copolymer PM6 backbone to finely tune the physicochemical and photovoltaic properties of the *** three non-equivalent D-A copolymers show the down-shifted highest occupied molecular orbital(HOMO)energy levels,higher hole mobility,higher degree of molecular self-assembly and higher molecular crystallinity with the increase of D-unit ratio in comparison with the alternate D-A copolymer *** a result,all the three non-equivalent D-A copolymer-based PSCs with Y6 as acceptor achieve improved power conversion efficiency(PCE)with higher V_(oc),larger J_(sc)and higher FF ***,the PM6-D1:Y6 based PSC achieved a high PCE of17.71%,which is significantly higher than that(15.82%)of the PM6:Y6 based PSC and is one of the highest performances in the binary PSCs.

关键词： polymer solar cells conjugated polymer donor materials donor-acceptor copolymers non-equivalent D-A copolymerization

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Ionic Liquid-Grafted Mxene Composite Polymer Electrolytes for High-Performance Solid-state Batteries

SSRN

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SSRN 2025年

作者： Li, Yu Qian, Zhi Qiu, Zhao-Dong Wang, Rui-Qing Wei, Mei-Tong Fei, An-Min Hu, Zhi-Yi Mohamed, Hemdan S.H. Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China Physics Department Faculty of Science Fayoum University El Gomhoria Street Fayoum63514 Egypt University of Namur NamurB-5000 Belgium

All-solid-state batteries (ASSBs) have obtained much attention due to the high energy density and security. At present, PEO-based solid-state batteries are considered to be one of the most promising candidates for high-performance ASSBs due to the excellent processability and good interfacial stability. However, low ionic conductivity and Li+ transference number seriously hinder their progress in practical applications. Here, a novel filler is developed by embedding ionic liquid (IL) grafted onto the surface of MXene to improve the electrochemical performance of PEO-based solid composite polymer electrolyte (MXene-IL-SPE) for ASSBs. The 2D MXene can significantly reduce the crystallinity of PEO, and the presence of IL not only enhances the dispersion of MXene in the polymer matrix, but also promotes the dissociation of lithium salts and anchors anions. As a result, the MXene-IL-SPE possesses high ionic conductivity (7.19 × 10-4 S cm-1) and Li+ transference number (0.51), together with wide electrochemical window (5.2 V) at 60 °C. The assembled LiFePO4|MXene-IL-SPE|Li full cell exhibits remarkable rate capability and exceptional capacity of 154.8 mAh g-1 over 120 cycles with an impressive 95.3% capacity retention at 0.5 C. This design opens up a new way to prepare high performance CPEs for ASSBs. © 2025, The Authors. All rights reserved.

关键词： Solid-state Batteries

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Tuning the Oxygen Vacancies and Mass Transfer of Porous Conductive Ceramic Supported Irox Catalyst Via Polyether Derived Composite Oxide Pyrolysis: Toward a Highly Efficient Oxygen Evolution Reaction Catalyst for Water Electrolysis

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SSRN 2023年

作者： Zhang, Hao Zhu, Liyan Shen, Yuhan Wu, Mingjuan Tian, Tian Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China Hubei Key Laboratory of Fuel Cell Wuhan430070 China

Slow oxygen evolution reaction (OER) and material transport impedance in catalyst coated membrane (CCM) are major challenges for the practical proton exchange membrane water electrolyzer (PEMWE). Herein, we present a novel OER catalyst with a multilevel porous support and abundant oxygen vacancies to boost efficiency and durability in water electrolysis. The formation of a heterointerface with abundant oxygen vacancies in IrOx improves the catalytic activity and prevents IrOx from peroxidation. Furthermore, the unique pore structure of the support facilitates the mass transport of the anode catalyst layer during water electrolysis at high current density, and the material transport resistance of the water electrolyzer is only 0.0154 Ω cm2 at 1.5 A cm-2. When used in a PEMWE, the prepared electrocatalysts have an impressive electrochemical performance of 1.87 V at 3·A cm-2 with an Ir loading of only 0.91 mg cm-2. This approach highlights the importance of oxygen vacancies and transportation in the catalyst-support interface, providing a promising solution for high-rate practical water electrolysis. © 2023, The Authors. All rights reserved.

关键词： Mass transfer

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