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Structure and defect dual-engineering of cobalt oxides for lowtemperature Zn-air batteries

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Nano Research 2024年第5期17卷 4108-4117页

作者： Hang Lei Zhuowen Huangfu Liangjun Chen Xuelin Yang Zilong Wang Wenjie mai Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering&New EnergyChina Three Gorges UniversityYichang 443002China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632China

The exploration of bifunctional electrocatalysts with high catalytic activity and long-term durability for low-temperature Zn-air batteries(ZABs)is an ongoing ***,quintet-shelled hollow spheres,P-doped multi-layer Co_(3)O_(4)(PM-Co_(3)O_(4)),with enriched oxygen vacancies are prepared by thermally induced mass relocation and a simple phosphating *** advanced characterizations reveal P anion-induced effects on internal electronic structure and local coordination *** finite element method elucidates that the complex multi-layer spherical nanostructure is conducive to the transport and diffusion of oh.and O_(2).Benefiting from its unique structural features and abundant oxygen vacancies,the well-designed PM-Co_(3)O_(4) presents small reversible oxygen overpotential for catalyzing oxygen reduction/evolution ***,the fabricated low-temperature ZABs based on PM-Co_(3)O_(4) as air-cathode exhibit high power density(20.8 mW·cm^(-2))and long-term stability(over 600 cycles)at the ultra-low temperature of-40℃,outperforming state-of-art Pt/C+IrO_(2)-based ***,the dynamic evolution mechanism of cobalt oxide catalysts during ZAB operation is *** work provides a guideline to design efficient electrocatalysts with regulated electronic configurations and exquisite nano-/microstructures for ZABs under extreme working conditions.

关键词： Zn-air batteries electrocatalysts low temperature hollow spheres oxygen vacancies

Continuous Fe^(3+)releasing enabled complete reconstruction of Ni-based MOF for promoted water oxidation in industrial alkali

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Science China Chemistry 2024年第9期67卷 2949-2957页

作者： Zhaojian Wang Wei Zhang Wenzhong Huang Ruohan Yu Changliang Chen Liqiang mai Liang Zhou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Sanya Science and Education Innovation Park Wuhan University of TechnologySanya 572000China Hubei Longzhong Laboratory Wuhan University of Technology(Xiangyang Demonstration Zone)Xiangyang 441000China

Most oxygen evolution reaction(OER)electrocatalysts show poor stability under industrial alkaline conditions(20–30 wt.%Koh).Therefore,it is essential to develop stable,efficient,and low-cost OER catalysts for industrial water ***,we present a straightforward approach for the complete electrochemical reconstruction of Ni-BDC,a Ni-based metal-organic framework,for *** method involves the continuous release of Fe^(3+)from Fe foam counter electrode in a high-concentration(6.0 M,25 wt.%)Koh *** continuously Fe^(3+)releasing not only realizes in situ Fe^(3+)doping,but also introduces abundant defects in the obtained catalyst during cyclic voltammetry activation,thereby accelerating the electrochemical *** reconstructed OER catalyst(Fe-doped nickel hydroxide/oxyhydroxide nanosheets supported on Ni foam,Fe-NiO_(x)(oh)y/NF)manifests a low overpotential of 217 mV at 10 mA cm^(-2)and 263 m V at 100 m A cm^(-2)in 1.0 M ***,the Fe-NiO_(x)(oh)_(y)/NF also demonstrates high stability in 30 wt.%*** strategy of regulating the electrochemical reconstruction process sheds light on the construction of stable and efficient OER catalysts for industrial water electrolysis.

关键词： oxygen evolution reaction industrial alkaline conditions metal-organic framework complete reconstruction

Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO_2 in the presence of hole scavengers

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Chinese Journal of Chemical Engineering 2018年第3期26卷 529-533页

作者： Abdus Samad Shamim Ahsan Ikki Tateishi mai Furukawa Hideyuki Katsumata Tohru Suzuki Satoshi Kaneco Department of Chemistry Jagannath University Department of Earth and Atmospheric Sciences Metropolitan State University of Denver Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Global Environment Center for Education & Research Mie University

The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide(TiO_2)was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone,formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO_2 was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO_2 photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·oh with hole scavenger.

关键词： Indirect photocatalytic reduction Arsenate Arsenite Titanium dioxide Hole scavenger

High‑Energy and High‑Power Pseudocapacitor–Battery Hybrid Sodium‑Ion Capacitor with Na^(+) Intercalation Pseudocapacitance Anode

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Nano-Micro Letters 2021年第3期13卷 209-221页

作者： Qiulong Wei Qidong Li Yalong Jiang Yunlong Zhao Shuangshuang Tan Jun Dong Liqiang mai Dong‑Liang Peng Department of Materials Science and Engineering Fujian Key Laboratory of Materials GenomeCollege of MaterialsXiamen UniversityXiamen 361005People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China Advanced Technology Institute University of SurreyGuildford Surrey GU27XHUK

High-performance and low-cost sodium-ion capacitors(SICs)show tremendous potential applications in public transport and grid energy ***,conventional SICs are limited by the low specific capacity,poor rate capability,and low initial coulombic efficiency(ICE)of anode ***,we report layered iron vanadate(Fe5V15O39(oh)9·9H2O)ultrathin nanosheets with a thickness of~2.2 nm(FeVO UNSs)as a novel anode for rapid and reversible sodium-ion *** to in situ synchrotron X-ray diffractions and electrochemical analysis,the storage mechanism of FeVO UNSs anode is Na+intercalation pseudocapacitance under a safe potential *** FeVO UNSs anode delivers high ICE(93.86%),high reversible capacity(292 mAh g^−1),excellent cycling stability,and remarkable rate ***,a pseudocapacitor–battery hybrid SIC(PBH-SIC)consisting of pseudocapacitor-type FeVO UNSs anode and battery-type Na3(VO)2(PO4)2F cathode is assembled with the elimination of presodiation *** PBH-SIC involves faradaic reaction on both cathode and anode materials,delivering a high energy density of 126 Wh kg^−1 at 91 W kg^−1,a high power density of 7.6 kW kg^−1 with an energy density of 43 Wh kg−1,and 9000 stable *** tunable vanadate materials with high-performance Na+intercalation pseudocapacitance provide a direction for developing next-generation highenergy capacitors.

关键词： Sodium-ion capacitors Pseudocapacitance Hybrid capacitors Two-dimensional materials Iron vanadate

Synthesis and Characterization of Titanosilicate with the Structure of Umbite

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Chemical Research in Chinese Universities 2002年第4期18卷 380-384页

作者： ZHAO Yong-nan LI Ya-feng ZOU Yong-chun mai Zhen-hong PANG Wen-qin Institute of Physics&Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080P.R.China Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jinlin UniversityChangchun 130023P.R.China

A zeolitic titanosilicate with the composition of K_2TiSi_3O_9·H_2O, a structural analogue of natural mineral umbite K_2ZrSi_3O_9·H_2O, was hydrothermally synthesized in the SiO_2-TiO_2-K_2O-H_2O system and characterized by means of powder X-ray diffraction, SEM, IR and thermal analysis. The effects of TiO_2/SiO_2 and oh -/SiO_2 ratios on the crystallization of the umbite were discussed. The influence of the organic additives on the morphology of the crystal was also investigated and the crystals with different shapes were obtained.

关键词： Synthesis Titanosilicate Umbite

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铁皮石斛多糖的提取工艺优化及抗氧化性研究

食品工业 2024年第4期45卷 108-113页

作者：刘根梅古翠婷麦汉铨刘永吉韶关学院食品学院韶关512005 广东省粤北食药资源利用与保护重点实验室韶关512005

以铁皮石斛为原材料,优化石斛多糖提取工艺,并探讨石斛多糖的抗氧化效果。以石斛多糖提取率作为评价指标,利用单因素试验和正交试验考察酶添加量、酶解温度、酶解时间、酶解pH、超声功率、超声时间6个因素对多糖提取的影响,并通过1,1-... 详细信息

以铁皮石斛为原材料,优化石斛多糖提取工艺,并探讨石斛多糖的抗氧化效果。以石斛多糖提取率作为评价指标,利用单因素试验和正交试验考察酶添加量、酶解温度、酶解时间、酶解pH、超声功率、超声时间6个因素对多糖提取的影响,并通过1,1-二苯基-2-苦肼基(DPPH)、羟自由基、超氧阴离子清除试验和铁离子还原试验评估所提取石斛多糖的抗氧化能力。结果表明,铁皮石斛多糖提取最佳工艺条件为酶解pH 4.0、酶添加量1.2%、酶解温度35℃、酶解时间2 h、超声功率540 W、超声时间4 min,在此工艺条件下铁皮石斛多糖提取率可达39.23%。铁皮石斛多糖对DPPH自由基、羟自由基具有较好的清除能力,表明铁皮石斛多糖具有较好的抗氧化活性。

关键词：铁皮石斛多糖超声辅助酶法抗氧化性

Ultrathin Metal Silicate Hydroxide Nanosheets with Moderate Metal-Oxygen Covalency Enables Efficient Oxygen Evolution

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Energy & Environmental Materials 2022年第1期5卷 231-237页

作者： Jiexin Zhu Shikun Li Zechao Zhuang Shan Gao Xufeng Hong Xuelei Pan Ruohan Yu Liang Zhou Lyudmila V.Moskaleva Liqiang mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology University of Bremen Department of Chemistry University of the Free State Collage of Chemistry & Chemical Engineering Anhui University Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valleyfoshan guangdong 528200china

Exploring efficient,cost-effective,and durable electrocatalysts for electrochemical oxygen evolution reaction(OER)is pivotal for the large-scale application of water *** advance has demonstrated that the activity of electrocatalysts exhibits a strong dependence on the surface electronic ***,a series of ultrathin metal silicate hydroxide nanosheets(UMSHNs)M_(3)Si_(2)O_(5)(oh)_(4)(M=Fe,Co,and Ni)synthesized without surfactant are introduced as highly active OER *** silicate hydroxide nanosheets show an optimal OER activity with overpotentials of 287 and 358 m V at 1 and 10 m A cm^(-2),*** experimental and theoretical studies,it is found that the OER activity of UMSHNs is dominated by the metal-oxygen covalency(MOC).High OER activity can be achieved by having a moderate MOC as reflected by aσ^(*)-orbital(e_(g))filling near unity and moderate[3d]/[2p]***,the UMSHNs exhibit favorable chemical stability under oxidation *** contribution provides a scientific guidance for further development of active metal silicate hydroxide catalysts.

关键词： electrocatalysis metal silicate hydroxide metal-oxygen covalency oxygen evolution reaction ultrathin nanosheet

Biogas residue biochar integrated with phosphate from its ash for the effective recovery of nutrients from piggery biogas slurry

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Biochar 2022年第1期4卷 800-816页

作者： Zifeng Luo Hongping Wen Haotian Zhang Yunliang Li Xueyi mai Yulong Zhang Jinjin Wang Yongtao Li Zhen Zhang College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China

Magnesium ammonium phosphate(MAP)precipitation generally requires an external phosphorus source to increase the recovery of NH_(4)^(+)-N from biogas ***,P-rich piggery biogas residue has been ignored as a phosphorus *** this study,biogas residue was carbonized into biogas residue biochar(BRC),followed by acid leaching to synthesize functionalized BRC and release PO_(4)^(3−)-P from its ash as the phosphorus *** effects of different acids on the leaching efficiency and morphological changes of P in BRC were investigated,and NH_(4)^(+)-N and PO_(4)^(3−)-P in the biogas slurry were recovered with functionalized BRC and MAP *** results showed that oxalic acid-hydrochloric acid mixed acid could leach more than 96%of P in BRC,while weakening the inhibitory effect of Ca^(2+)on MAP *** BRC was mainly composed of inorganic P,and most nonapatite IP and apatite P(Ca_(3)(PO_(4))2)were leached during acid leaching,with the latter more easily *** optimal recovery conditions,the method had a significant recovery effect on NH_(4)^(+)-N(96.4%)and PO_(4)^(3−)-P(99.3%)in biogas *** recovery of NH_(4)^(+)-N and PO_(4)^(3−)-P by functionalized BRC was mainly through chemical precipitation(forming NH_(4)MgPO_(4)·H_(2)O precipitate)while bonding with-oh,C=O and C-H functional *** final recovery product was also a BRC-based slow-release N-P fertilizer rich in *** study solved the disposal problems of P-rich biogas residue and N-rich biogas slurry while providing an innovative technology for the resource utilization of faecal sewage at pig farms.

关键词： Biogas slurry Biogas residue biochar Phosphorus source Ammonium and phosphorus Simultaneous recovery

Biomimetic manganese-based theranostic nanoplatform for cancer multimodal imaging and twofold immunotherapy

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Bioactive Materials 2023年第1期19卷 237-250页

作者： Yuyue Zhao Yuanwei Pan Kelong Zou Zhou Lan Guowang Cheng Qiuying mai Hao Cui Qianfang Meng Tongkai Chen Lang Rao Limin Ma Guangtao Yu Stomatological Hospital Southern Medical UniversityGuangzhou510280China Institute of Biomedical Health Technology and Engineering Shenzhen Bay LaboratoryShenzhen518132China Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and Faculty of EngineeringNational University of SingaporeSingapore119074Singapore Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhou510405China Medical Research Center Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou510080China

The limited clinical response and serious side effect have been challenging in cancer immunotherapy resulting from immunosuppressive tumor microenvironment(TME)and inferior drug ***,an active targeting TME nanoplatform capable of revising the immunosuppressive TME microenvironment is ***,gold nanorods(GNRs)are covered with silica dioxide(SiO_(2))and then coated manganese dioxide(MnO_(2))to obtain GNRs@SiO_(2)@MnO_(2)(GSM).Myeloid-derived suppressor cells(MDSCs)membrane is further camouflaged on the surface of GSM to obtain GNRs@SiO_(2)@MnO_(2)@MDSCs(GSMM).In this system,GSMM inherits active targeting TME capacity of *** localized surface plasmon resonance of GNRs is developed in near-infraredⅡwindow by MnO_(2)layer coating,realizing NIR-Ⅱwindow photothermal imaging and photoacoustic imaging of *** on the release of Mn^(2+)in acidic TME,GSMM can be also used for magnetic resonance *** cancer cells,Mn^(2+)catalyzes H_(2)O_(2)into·oh for(chemodynamic therapy)CDT leading to activate cGAS-STING,but also directly acts on STING inducing secretion of typeⅠinterferons,pro-inflammatory cytokines and ***,photothermal therapy and CDT-mediated immunogenic cell death of tumor cells can further enhance anti-tumor immunity via exposure of CRT,HMGB1 and *** summary,our nanoplatform realizes multimodal cancer imaging and dual immunotherapy.

关键词： Biomimetic Manganese ions The second near-infrared window Cancer imaging Immunotherapy