Metal-organic framework-derived phosphide nanomaterials for electrochemical applications

Because of features,such as adjustable structures,high porosity,and high crystallinity,metal-organic frameworks(MOFs)deservedly have received considerable attention.Nevertheless,there is still room for improvements in the electrical conductivity and chemical stability of some MOFs,because of which they cannot be utilized as electrode materials.Fortunately,MOF derivatives have received widespread attention in recent years,especially phosphide materials,which are widely used in practical applications because of their outstanding conductivity,excellent specific surface area,and standout charge mobility.In this review,the latest developments of MOF-derived phosphides in electrocatalysis related to energy,including the excellent performance in terms of electrochemical energy storage and ingenious strategies,and diversified synthetic approaches are emphasized and summarized.Additionally,the arduous task and feasible proposals of MOF-derived phosphides are also discussed.

Metal-Organic Framework-Based Sulfur-Loaded Materials

Lithium-sulfur batteries(LSBs)are considered promising new energy storage systems given their outstanding theoretical energy densities.Nevertheless,issues such as low electrical conductivity and severe volume expansion,along with the formation of polysulfides during cycling,restrict their practical applications.To overcome these issues,it is necessary to find suitable and effective sulfur host materials.Metal-organic frameworks(MOFs),which are porous crystalline materials in the bourgeoning developmental stages,have demonstrated enormous potential in LSBs owing to their high porosity and tunable porous structure.Herein,we provide a comprehensive overview of MOF-based sulfur-loaded materials and discuss the charge/discharge mechanisms,strategies of enhancing battery performance,sulfur loading methods,and applications in LSBs.An outlook on future directions,prospects,and possible obstacles for the development of these materials is also provided.

Recent advances in the development of perovskite@metal-organicframeworks composites

Metal-organic frameworks(MOFs)have received considerable attention because of their advantages of adjustable structure,high porosity,and rich active centers.Meanwhile,perovskite has attracted research interest due to its unique highemission quantum yield and excellent optoelectronic properties.However,the instability of perovskites under certain conditions hinders their more comprehensive development.A novel strategy encapsulates perovskite in the pores of MOFs to protect it from external interference and increase the active centers,thus improving the performance of perovskite@MOF composites.In this review,the latest research progress in the synthesis strategy,function,and application of perovskite@MOF composites is systematically summarized.Additionally,the challenges of further developing perovskite@MOF composites are discussed.Hopefully,this review provides creative inspiration to advance future studies on perovskite@MOF composites in this emerging field.

Micro/nano metal–organic frameworks meet energy chemistry: A review of materials synthesis and applications

Micro/nano metal–organic frameworks(MOFs)have attracted significant attention in recent years due to their numerous unique properties,with many synthetic methods and strategies being reported for constructing MOFs with specific micro/nano structures.In addition,the design of micro/nano MOFs for energy storage and conversion applications and the study of the structure–activity relationship have also become research hotspots.Herein,a comprehensive overview of the recent progress on micro/nano MOFs is presented.We begin with a brief introduction to the various synthesis methods for controlling the morphology of micro/nano MOFs.Subsequently,the structure-dependent properties of micro/nano MOFs as electrode materials or catalysts in terms of batteries,supercapacitors,and catalysis are discussed.Finally,the remaining challenges and future perspectives in this field are presented.Overall,this review is expected to inspire the design of advanced micro/nano MOFs for efficient energy storage and conversion technologies.

金属有机框架集成到打印器件的最新进展及其应用

金属有机框架(metal-organic frameworks,MOFs)凭借具有吸引力的特性在科学研究中取得了前所未有的进展.然而,MOFs的缺点如加工性差、化学稳定性低和机械性能有限阻碍了它们的广泛应用.具有几何可控性、快速原型制作和可持续制造等优势的打印技术可以有效解决MOFs的这些问题.截至目前,MOF集成的打印器件已经取得了重要的突破和进步.本文提供了MOF集成的印刷设备的最新进展.首先总结了基于MOF器件制造常用的印刷技术.然后,重点介绍了打印技术在器件制造方面以及所制造的器件在具体应用方面所取得的重要进展.最后,提出了这些器件潜在的研究前沿和目前面临的主要挑战.

Applications of Machine Learning in Electrochemistry

The introduction of density functional theory(DFT)and electronic structure has brought computational methods into the field of materials science.In these theoretical calculations,quantum mechanics is predominantly used.Machine learning(ML)and high-throughput computing share some inherent similarities,as both can extract valuable information from massive datasets and possess parallelism and scalability.ML techniques simulate human thought processes,with algorithms that make decisions and have good scalability and strong generalization abilities.The combination of high-throughput and ML technologies leverages the advantages of high-throughput technology standardization and high capacity,addressing the challenges faced by ML at the front end.This complementary combination is expected to further enhance the efficiency of material screening and development.In data mining,using ML methods on various databases,the interrelationships between molecular structures and properties are discovered from large amounts of data.Mapping,current utilization of DFT,materials genomics,and high-throughput computing have generated a substantial amount of data.This review provides new insights into the development of electrochemistry.

吡啶调节2D双金属有机框架及其电催化析氧性能研究

二维金属有机骨架(2D MOF)具有较大的比表面积和较高的活性位点密度,是改善电催化性能的理想载体.通过简单的制备方法获得2D纳米结构受到了广泛的关注.本文提出了一种吡啶调节溶剂热合成方法,用于合成镍/钴双金属MOF纳米片.得到的MOF材料具有矩形2D形貌,厚度约20纳米.这些纳米片作为电催化剂在碱性条件下表现出析氧反应(OER)活性.其中,Ni0.5Co1.5-bpy(PyM)在1.0 mol L-1KOH溶液中、电流密度10 mA cm-2时过电位低至256 mV,Tafel斜率为81.8 mV dec-1,且具有良好的电化学稳定性.对催化反应后的电极材料研究表明,Ni0.5Co1.5-bpy(PyM)的高催化活性来源于原位形成的活性氢氧化物和羟基氧化物.该研究为2D MOF材料的可控合成及其与电催化性能构效关系的研究提供了理论基础.

A controllable preparation of two-dimensional cobalt oxalate-based nanostructured sheets for electrochemical energy storage

Well-defined two-dimensional(2D)cobalt oxalate(CoC_(2)O_(4)·2H_(2)O)nanosheets exhibit more excellent property than common bulk cobalt oxalate due to high specific surface areas and high-efficient transport of ion and electron.However,the delicate control of the 2D morphology of CoC_(2)O_(4)·2H_(2)O during their synthesis remains challenging.Herein,2D CoC_(2)O_(4)·2H_(2)O nanosheets(M1),grown by straightforward chemical precipitation,can be tuned from three-dimensional(3D)structure during their synthesis with no templates or capping agents.This control is obtained by rationally changing the ratio of reactants with ethylene glycol as solvent.Moreover,Co_(3)O_(4)/CoC_(2)O_(4)composites(M1-250)have been fabricated through low-temperature thermal treatment of the M1 precursor in air,which possess porous surfaces with the 2D morphology maintained.Benefiting from the porous surfaces,more redox-active sites and better electrical conductivity of Co_(3)O_(4),the constructed M1-250//AC aqueous device manifest improved kinetics of the electrochemistry process with energy density of 27.9 Wh/kg at 550.7 W/kg and good cycling stability with sustaining 73.0 m Ah/g after 5000 cycles.

Printable electrode materials for supercapacitors

The invention of printing technologies has revolutionized the manner in which information is transmitted and reproduced.In the modern era,printing technologies,which are equipped with computerized control and de-sign methods,have become considerably efficient and effective,facilitating A significant breakthrough in the manufacture of high-performance electrochemical energy storage systems.Through careful design and execu-tion,the components of energy storage devices,particularly electrodes,can be formulated into functional inks,enabling the use of divers materials and devices in high-performance energy storage applications.This review-focuses on three major printing technologies:inkjet printing,screen printing,and 3D printing,introducing the principles of each printing technology,the design and preparation of various electrode inks,and their applica-tions in supercapacitors.Finally,the challenges and scope for the future development of printing technologies forhigh-performance supercapacitors are presented.