Hard carbon(HC)is regarded as the most promising commercial anode material for sodium-ion batteries(SIBs)due to its low cost,abundant sources,large reversible capacity,and suitability.Nevertheless,HC suffers from low ...Hard carbon(HC)is regarded as the most promising commercial anode material for sodium-ion batteries(SIBs)due to its low cost,abundant sources,large reversible capacity,and suitability.Nevertheless,HC suffers from low initial coulombic efficiency(ICE),poor rate performance,and long-term cycling performance,significantly restricting its practical application.Herein,we proceed with defined regulation of the microcrystalline structure of coal-derived HC,which leads to reduced surface defects and increased interlayer spacing,further enhancing the sodium storage capacity of coal-derived HC as an anode material for SIBs by coating porous HC with soft carbon(SC).Meanwhile,we successfully synthesized high-performance SC@HC composite materials through chemical crosslinking reactions by innovatively adopting the sol-gel method and SC coating for the complex composition of coal.The SC@HC composite material as an anode in SIBs can deliver a reversible capacity of 320 mA h g^(−1)at 0.01 A g^(−1),a high ICE of 89%,and good cycling stability(capacity retention of 80%after 400 cycles at 1 A g^(−1)).This work can rationally guide the design of low-defect and much more closed pore coal-derived HC materials and provide a feasible route for the development of high-performance HC-based anode materials for SIB applications.展开更多
The readjusted objectives and structure of the departments responsible for auto industries management of the State Administration of Ma-chinery Industry (SAMI) which is located in Beijing has officially been defined a...The readjusted objectives and structure of the departments responsible for auto industries management of the State Administration of Ma-chinery Industry (SAMI) which is located in Beijing has officially been defined as follows. ●Objectives of Div. of Auto Industry Planning under Dept. of Planning and Develop-ment of SAMI ——Working out development strategies, en-展开更多
In the originally published version of this article,the authors identified inadvertent errors in the preparation of Fig.7A and B.During assembly of the figure,incorrect images from the same batch of raw data were mist...In the originally published version of this article,the authors identified inadvertent errors in the preparation of Fig.7A and B.During assembly of the figure,incorrect images from the same batch of raw data were mistakenly selected and duplicated across two separate studies.The figure has now been replaced with the correct images sourced from the same original dataset.展开更多
Atomic-level active site design and modulation are challenging in catalysis,and atomically precise copper nanoclusters(NCs)present a promising solution due to the well-defined structures and tunable active sites.We re...Atomic-level active site design and modulation are challenging in catalysis,and atomically precise copper nanoclusters(NCs)present a promising solution due to the well-defined structures and tunable active sites.We report two novel Cu NCs with formamidinate protecting ligands:[Cu_(33)H18(Me-dpf)_(12)](BF_(4))_(3)(Cu_(33-1),Me-Hdpf=N,N′-di(5-methyl-2-pyridinyl)formamidine)and[Cu_(33)H_(16)(Me-dpf)_(12)C_(l2)](BF_(4))_(3)(Cu_(33-2)).In both clusters,all Cu atoms are N-coordinated,forming abundant active Cu-N sites for CO_(2) reduction reaction(CO_(2)RR).Both Cu_(33) NCs with highly active Cu^(+)-N sites exhibit remarkable CO_(2)-to-CH_(4) conversion efficiency.Cu_(33-1) shows notable CO_(2)-to-CH_(4) selectivity(57.7%)and stability(FECH_(4)>50% after 12 h),achieving a remarkable conversion rate of 0.517μmol cm^(-2) s^(-1) in a flow cell and surpassing all known NC catalysts.Detailed in-situ spectroscopies revealed that these precisely engineered Cu^(+)-N sites stabilize key intermediates*CHO and*OCH_(2),significantly promoting CH_(4) formation.This study underscores precise engineering of active sites,providing valuable insights for designing highly efficient NC catalysts for CO_(2) conversion.展开更多
基金supported by the Key projects of Intergovernmental International Cooperation in Key R&D programs of the Ministry of Science and Technology of China(No.2021YFE0115800)the National Science Funding Committee of China(No.U20A20250)+1 种基金the programs of the Science and Technology of Yulin City(No.CXY-2023-ZX04)the funding from the Shccig-Qinling Program.
文摘Hard carbon(HC)is regarded as the most promising commercial anode material for sodium-ion batteries(SIBs)due to its low cost,abundant sources,large reversible capacity,and suitability.Nevertheless,HC suffers from low initial coulombic efficiency(ICE),poor rate performance,and long-term cycling performance,significantly restricting its practical application.Herein,we proceed with defined regulation of the microcrystalline structure of coal-derived HC,which leads to reduced surface defects and increased interlayer spacing,further enhancing the sodium storage capacity of coal-derived HC as an anode material for SIBs by coating porous HC with soft carbon(SC).Meanwhile,we successfully synthesized high-performance SC@HC composite materials through chemical crosslinking reactions by innovatively adopting the sol-gel method and SC coating for the complex composition of coal.The SC@HC composite material as an anode in SIBs can deliver a reversible capacity of 320 mA h g^(−1)at 0.01 A g^(−1),a high ICE of 89%,and good cycling stability(capacity retention of 80%after 400 cycles at 1 A g^(−1)).This work can rationally guide the design of low-defect and much more closed pore coal-derived HC materials and provide a feasible route for the development of high-performance HC-based anode materials for SIB applications.
文摘The readjusted objectives and structure of the departments responsible for auto industries management of the State Administration of Ma-chinery Industry (SAMI) which is located in Beijing has officially been defined as follows. ●Objectives of Div. of Auto Industry Planning under Dept. of Planning and Develop-ment of SAMI ——Working out development strategies, en-
文摘In the originally published version of this article,the authors identified inadvertent errors in the preparation of Fig.7A and B.During assembly of the figure,incorrect images from the same batch of raw data were mistakenly selected and duplicated across two separate studies.The figure has now been replaced with the correct images sourced from the same original dataset.
基金supported by the National Key R&D Program of China(grant no.2022YFA1503900)the National Natural Science Foundation of China(grant nos.92361301 and 22401114)+1 种基金the Basic Research Program of Jiangsu(grant no.BK20241604)the Fundamental Research Funds for the Central Universities(grant no.JUSRP202401026).
文摘Atomic-level active site design and modulation are challenging in catalysis,and atomically precise copper nanoclusters(NCs)present a promising solution due to the well-defined structures and tunable active sites.We report two novel Cu NCs with formamidinate protecting ligands:[Cu_(33)H18(Me-dpf)_(12)](BF_(4))_(3)(Cu_(33-1),Me-Hdpf=N,N′-di(5-methyl-2-pyridinyl)formamidine)and[Cu_(33)H_(16)(Me-dpf)_(12)C_(l2)](BF_(4))_(3)(Cu_(33-2)).In both clusters,all Cu atoms are N-coordinated,forming abundant active Cu-N sites for CO_(2) reduction reaction(CO_(2)RR).Both Cu_(33) NCs with highly active Cu^(+)-N sites exhibit remarkable CO_(2)-to-CH_(4) conversion efficiency.Cu_(33-1) shows notable CO_(2)-to-CH_(4) selectivity(57.7%)and stability(FECH_(4)>50% after 12 h),achieving a remarkable conversion rate of 0.517μmol cm^(-2) s^(-1) in a flow cell and surpassing all known NC catalysts.Detailed in-situ spectroscopies revealed that these precisely engineered Cu^(+)-N sites stabilize key intermediates*CHO and*OCH_(2),significantly promoting CH_(4) formation.This study underscores precise engineering of active sites,providing valuable insights for designing highly efficient NC catalysts for CO_(2) conversion.
