Ni/Co bimetallic organic frameworks nanospheres for highperformance electrochemical energy storage  

作　　者：Jianru Guan Minlu Liu Limin Zhu Jiamei Wang Qing Han Xiaoxia Yang Weibo Hua Lingling Xie Xiaoyu Cao 

机构地区：[1]School of Chemistry and Chemical Engineering,Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou City,Henan University of Technology,Zhengzhou 450001,China [2]School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China [3]School of Environmental Engineering,Henan University of Technology,Zhengzhou 450001,China

出　　处：《Nano Research》2024年第6期5122-5130,共9页纳米研究（英文版）

基　　金：National Natural Science Foundation of China(Nos.52071132,52261135632,U21A20284,and 52371237);Program for Innovative Team(in Science and Technology)in University of Henan Province,China(No.24IRTSTHN006);Natural Science Foundation of Henan,China(Nos.232300421080 and 222300420138);Science and Technology Project of Henan Province,China(Nos.232102241038 and 232102241004);Key Scientific Research Programs in Universities of Henan Province,China-Special Projects for Basic Research(No.23ZX008);Innovative Funds Plan of Henan University of Technology,China(No.2020ZKCJ04).

摘　　要：In addition to their many well-known advantages(e.g.,ultra-high porosity,good pore size distribution,easy functionalization,and structural tolerability),metal-organic frameworks(MOFs)are a new class of advanced functional materials.However,their backbones are highly susceptible to deformation after exposure to acidic or alkaline conditions.As a result of lithium-ion batteries embedding or detaching directly from MOFs,they irreversibly collapse.As a result,they fail to maintain their electrochemical performance.These factors have hindered the development of MOFs as direct electrode materials,making the design of MOF materials with controlled morphology and stable dimensions a new challenge.In this study,we adopted a versatile and effective method to synthesize a novel MOF material(NiCo-BP(BP=BTC/phen and BTC=1,3,5-benzenetricarboxylic acid))using the rigid ligands 1,10-phenanthroline and homobenzotrizoic acid,and the emergence of the Ni-O/N and Co-O/N coordination layers was observed by extended X-ray absorption fine structure(EXAFS)tests,indicating that Ni and Co were coordinated with heterocyclic N-given atoms to form a stable p-πconjugated structure.Meanwhile,the metal-ion is attached to the carboxylic acid ligand on the other side,making the metal-organic skeleton complete and robust.The nanosphere structure of NiCo-BP(~400 nm)allows for full exposure and utilisation of the active sites,especially the Ni,Co,and phenanthroline units,and exhibit impressively high specific capacity and cycling stability.At a high current density of 1.0 A·g^(−1),a high discharge specific capacity of 631.6 mAh·g^(−1)was obtained after 1000 cycles.The co-participation of two organic ligands in the coordination is in accordance with the theory of soft and hard acids and bases,which contributes to the ability of the material to maintain a high capacity in cycling as well as its cyclic stability.

关 键 词：lithium-ion batteries metal organic frame electrochemical energy storage dual ligand hard-soft-acid-base 

分 类 号：O64[理学—物理化学]