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Your search keyword '"Duan, Xiangfeng"' showing total 29 results
Start Over Author "Duan, Xiangfeng" Journal journal of the american chemical society
29 results on '"Duan, Xiangfeng"'

2. Solid-State Electrocatalysis in Heteroatom-Doped Alloy Anode Enables Ultrafast Charge Lithium-Ion Batteries

Author

Zhou, En, Jin, Hongchang, Lv, Haifeng, Xie, Yuansen, Lu, Yuhao, Lu, Ying-Rui, Chan, Ting-Shan, Wang, Chao, Yan, Wensheng, Zhang, Jing, Ji, Hengxing, Wu, Xiaojun, and Duan, Xiangfeng

Abstract

Electrocatalysis is generally confined to dynamic liquid–solid and gas–solid interfaces and is rarely applicable in solid-state reactions. Here, we report a paradigm shift strategy to exploit electrocatalysis to accelerate solid-state reactions in the context of lithium-ion batteries (LIBs). We employ heteroatom doping, specifically boron for silicon and sulfur for phosphorus, to catalyze electrochemical Li-alloying reactions in solid-state electrode materials. The preferential cleavage of polar dopant-host chemical bonds upon lithiation triggers chemical bond breaking of the host material. This solid-state catalysis, distinct from liquid and gas phases, requires a critical doping concentration for optimal performance. Beyond a critical concentration of ∼1 atom %, boron and sulfur doping drastically reduces activation energies and accelerates redox kinetics during lithiation/delithiation processes, leading to markedly enhanced rate performance in boron-doped silicon and sulfur-doped black/red phosphorus anode. Notably, a sulfur-doped black phosphorus anode coupled with a lithium cobalt oxide cathode achieves an ultrafast-charging battery, recharging 80% energy of a battery in 302 Wh kg–1in 9 min, surpassing the thus far reported LIBs.

Published
2024
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5. Correction to “Autobifunctional Mechanism of Jagged Pt Nanowires for Hydrogen Evolution Kinetics via End-to-End Simulation”

Author

Gu, Geun Ho, primary, Lim, Juhyung, additional, Wan, Chengzhang, additional, Cheng, Tao, additional, Pu, Heting, additional, Kim, Sungwon, additional, Noh, Juhwan, additional, Choi, Changhyeok, additional, Kim, Juhwan, additional, Goddard, William A., additional, Duan, Xiangfeng, additional, and Jung, Yousung, additional

Published
2021
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12. Confined Pyrolysis within Metal–Organic Frameworks To Form Uniform Ru3 Clusters for Efficient Oxidation of Alcohols

Author

Ji, Shufang, primary, Chen, Yuanjun, additional, Fu, Qiang, additional, Chen, Yifeng, additional, Dong, Juncai, additional, Chen, Wenxing, additional, Li, Zhi, additional, Wang, Yu, additional, Gu, Lin, additional, He, Wei, additional, Chen, Chen, additional, Peng, Qing, additional, Huang, Yu, additional, Duan, Xiangfeng, additional, Wang, Dingsheng, additional, Draxl, Claudia, additional, and Li, Yadong, additional

Published
2017
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14. Element Screening of High-Entropy Silicon Anodes for Superior Li-Storage Performance of Li-Ion Batteries

Author

Li, Wenwu, Wang, Jeng-Han, Li, Yanhong, Hsueh, Howard, Liu, Xiao, Zhao, Yafei, Huang, Shengchi, Li, Xinwei, Cheng, Hui-Ming, Duan, Xiangfeng, and Park, Ho Seok

Abstract

The high-entropy silicon anodes are attractive for enhancing electronic and Li-ionic conductivity while mitigating volume effects for advanced Li-ion batteries (LIBs), but are plagued by the complicated elements screening process. Inspired by the resemblances in the structure between sphalerite and diamond, we have selected sphalerite-structured SiP with metallic conductivity as the parent phase for exploring the element screening of high-entropy silicon-based anodes. The inclusion of the Zn in the sphalerite structure is crucial for improving the structural stability and Li-storage capacity. Within the same group, Li-storage performance is significantly improved with increasing atomic number in the order of BZnSiP3< AlZnSiP3< GaZnSiP3< InZnSiP3. Thus, InZnSiP3-based electrodes achieved a high capacity of 719 mA h g–1even after 1,500 cycles at 2,000 mA g–1, and a high-rate capacity of 725 mA h g–1at 10,000 mA g–1, owing to its superior lithium-ion affinity, faster electronic conduction and lithium-ion diffusion, higher Li-storage capacity and reversibility, and mechanical integrity than others. Additionally, the incorporation of elements with larger atomic sizes leads to greater lattice distortion and more defects, further facilitating mass and charge transport. Following these screening rules, high-entropy disordered-cation silicon-based compounds such as GaCuSnInZnSiP6, GaCu(or Sn)InZnSiP5, and CuSnInZnSiP5, as well as high-entropy compounds with mixed-cation and -anion compositions, such as InZnSiPSeTe and InZnSiP2Se(or Te), are synthesized, demonstrating improved Li-storage performance with metallic conductivity. The phase formation mechanism of these compounds is attributed to the negative formation energies arising from elevated entropy.

Published
2024
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20. Growth of Alloy MoS2xSe2(1–x) Nanosheets with Fully Tunable Chemical Compositions and Optical Properties

Author

Li, Honglai, primary, Duan, Xidong, additional, Wu, Xueping, additional, Zhuang, Xiujuan, additional, Zhou, Hong, additional, Zhang, Qinglin, additional, Zhu, Xiaoli, additional, Hu, Wei, additional, Ren, Pinyun, additional, Guo, Pengfei, additional, Ma, Liang, additional, Fan, Xiaopeng, additional, Wang, Xiaoxia, additional, Xu, Jinyou, additional, Pan, Anlian, additional, and Duan, Xiangfeng, additional

Published
2014
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22. Synthetic Control of Two-Dimensional NiTe2Single Crystals with Highly Uniform Thickness Distributions

Author

Zhao, Bei, Dang, Weiqi, Liu, Yuan, Li, Bo, Li, Jia, Luo, Jun, Zhang, Zhengwei, Wu, Ruixia, Ma, Huifang, Sun, Guangzhuang, Huang, Yu, Duan, Xidong, and Duan, Xiangfeng

Abstract

Two-dimensional (2D) layered materials have stimulated extensive research interest for their unique thickness-dependent electronic and optical properties. However, the layer-number-dependent studies on 2D materials to date are largely limited to exfoliated flakes with relatively small lateral size and poor yield. The direct synthesis of 2D materials with a precise control of the number of atomic layers remains a substantial synthetic challenge. Here we report a systematic study of chemical vapor deposition synthesis of large-area atomically thin 2D nickel telluride (NiTe2) single crystals and investigate the thickness dependent electronic properties. By controlling the growth temperature, we show that the highly uniform NiTe2single crystals can be synthesized with precisely tunable thickness varying from 1, 2, 3, . . . to multilayers with a standard deviation (∼0.3 nm) of less than the thickness of a monolayer layer NiTe2. Our studies further reveal a systematic evolution of single crystal domain size and nucleation density with the largest lateral domain size up to ∼440 μm. X-ray diffraction, transmission electron microscopy, and high resolution scanning transmission electron microscope studies demonstrate that the resulting 2D crystals are high quality single crystals and adopt hexagonal 1T phase. Electrical transport studies reveal that the 2D NiTe2single crystals show a strong thickness-tunable electrical properties, with an excellent conductivity up to 7.8 × 105S m–1and extraordinary breakdown current density up to 4.7 × 107A/cm2. The systematic study and robust synthesis of NiTe2nanosheets defines a reliable chemical route to 2D single crystals with precisely tailored thickness and could enable the design of new device architectures based on thickness-tunable electrical properties.

Published
2018
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28. Synthetic Control of Two-Dimensional NiTe 2 Single Crystals with Highly Uniform Thickness Distributions.

Author

Zhao B, Dang W, Liu Y, Li B, Li J, Luo J, Zhang Z, Wu R, Ma H, Sun G, Huang Y, Duan X, and Duan X

Abstract

Two-dimensional (2D) layered materials have stimulated extensive research interest for their unique thickness-dependent electronic and optical properties. However, the layer-number-dependent studies on 2D materials to date are largely limited to exfoliated flakes with relatively small lateral size and poor yield. The direct synthesis of 2D materials with a precise control of the number of atomic layers remains a substantial synthetic challenge. Here we report a systematic study of chemical vapor deposition synthesis of large-area atomically thin 2D nickel telluride (NiTe 2 ) single crystals and investigate the thickness dependent electronic properties. By controlling the growth temperature, we show that the highly uniform NiTe 2 single crystals can be synthesized with precisely tunable thickness varying from 1, 2, 3, . . . to multilayers with a standard deviation (∼0.3 nm) of less than the thickness of a monolayer layer NiTe 2 . Our studies further reveal a systematic evolution of single crystal domain size and nucleation density with the largest lateral domain size up to ∼440 μm. X-ray diffraction, transmission electron microscopy, and high resolution scanning transmission electron microscope studies demonstrate that the resulting 2D crystals are high quality single crystals and adopt hexagonal 1T phase. Electrical transport studies reveal that the 2D NiTe 2 single crystals show a strong thickness-tunable electrical properties, with an excellent conductivity up to 7.8 × 10 5 S m -1 and extraordinary breakdown current density up to 4.7 × 10 7 A/cm 2 . The systematic study and robust synthesis of NiTe 2 nanosheets defines a reliable chemical route to 2D single crystals with precisely tailored thickness and could enable the design of new device architectures based on thickness-tunable electrical properties.

Published
2018
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29. Confined Pyrolysis within Metal-Organic Frameworks To Form Uniform Ru 3 Clusters for Efficient Oxidation of Alcohols.

Author

Ji S, Chen Y, Fu Q, Chen Y, Dong J, Chen W, Li Z, Wang Y, Gu L, He W, Chen C, Peng Q, Huang Y, Duan X, Wang D, Draxl C, and Li Y

Abstract

Here we report a novel approach to synthesize atomically dispersed uniform clusters via a cage-separated precursor preselection and pyrolysis strategy. To illustrate this strategy, well-defined Ru 3 (CO) 12 was separated as a precursor by suitable molecular-scale cages of zeolitic imidazolate frameworks (ZIFs). After thermal treatment under confinement in the cages, uniform Ru 3 clusters stabilized by nitrogen species (Ru 3 /CN) were obtained. Importantly, we found that Ru 3 /CN exhibits excellent catalytic activity (100% conversion), high chemoselectivity (100% for 2-aminobenzaldehyde), and significantly high turnover frequency (TOF) for oxidation of 2-aminobenzyl alcohol. The TOF of Ru 3 /CN (4320 h -1 ) is about 23 times higher than that of small-sized (ca. 2.5 nm) Ru particles (TOF = 184 h -1 ). This striking difference is attributed to a disparity in the interaction between Ru species and adsorbed reactants.

Published
2017
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