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377 results on '"Hu, Chuangang"'

66. Additional file 1 of Understanding of catalytic ROS generation from defect-rich graphene quantum-dots for therapeutic effects in tumor microenvironment

Author

Wang, Xichu, Hu, Chuangang, Gu, Zi, and Dai, Liming

Abstract

Additional file 1: Table S1. Band structure and reference equation (1) & (2). Table S2. Comparison of Km and Vmax for different catalyst. Figure S1. Hydrodynamic size distribution via DLS for GQDs. Figure S2. Zeta potential for GQDs. Figure S3. FT-IR spectra for GQDs before and after reaction. Figure S4. UV-Vis spectrum GQDs (5 μg/ml). Figure S5. Relative catalytic activity of GQDs at different pH values (a) and different temperature (b). Figure S6. Normalized absorbance (at 652 nm) of GQDs under TME mimic conditions (TMB (800 μg/ml) + GQDs (100 μg/ml) + 100μM H2O2) and control groups (MiliQ Water (solvent), TMB (800 μg/ml), TMB (800 μg/ml) + GQDs (100 μg/ml), TMB (800 μg/ml) + 100 μM H2O2). Figure S7. Time course TMB assay - absorbance (at 652 nm) of GQDs (50 μg/ml) with different concentration of H2O2 (0.1, 0.5, 1, 2 mM). Figure S8. Reaction between hydroxyl radical and terephthalic acid (TA). Figure S9. Terephthalic acid (TA) intensity over time via fluorescence spectrometry. Figure S10. ESR spectra of GQDs (50 μg/ml) + H2O2 (1 mM) + DMPO (5 mM) comparing with typical hydroxyl radicals pattern with DMPO. Figure S11. Tolerance of 4T1 cell line with H2O2 (0–1 mM) after 24 h. Figure S12. Biosafety of GQDs. Cell viability of normal cell NIH-3T3 cells treated with different concentration of GQDs (0–1000 μg/ml) for 24 hr. Figure S13. Living cell imaging results: percentage of confluence for 4T1/MCF-7 cell lines under GQDs (CQDs 100 μg/ml) in TME (H2O2 100 μM) treatments, control: PBS. Living cell images were recorded on InCyte3. Figure S14. Alkaline Comet results, scale bar: 200 μm. Figure S15. TEM images for 20 h cellular uptake of GQDs in 4T1 cells.

Published
2021
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69. High‐Performance, Long‐Life, Rechargeable Li–CO2 Batteries based on a 3D Holey Graphene Cathode Implanted with Single Iron Atoms

Author

Hu, Chuangang, primary, Gong, Lele, additional, Xiao, Ying, additional, Yuan, Yifei, additional, Bedford, Nicholas M., additional, Xia, Zhenhai, additional, Ma, Lu, additional, Wu, Tianpin, additional, Lin, Yi, additional, Connell, John W., additional, Shahbazian‐Yassar, Reza, additional, Lu, Jun, additional, Amine, Khalil, additional, and Dai, Liming, additional

Published
2020
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74. Topological Defect‐Rich Carbon as a Metal‐Free Cathode Catalyst for High‐Performance Li‐CO2 Batteries.

Author

Ye, Fenghui, Gong, LeLe, Long, Yongde, Talapaneni, Siddulu Naidu, Zhang, Lipeng, Xiao, Ying, Liu, Dong, Hu, Chuangang, and Dai, Liming

Subjects
ELECTRIC batteries, CATALYSTS, CATHODES, DENSITY functional theory, STORAGE batteries, CARBON
Abstract

Exploration of the highly efficient bi‐functional catalysts toward the reduction of CO2 and decomposition of Li2CO3 at the cathode is the key for high‐performance Li‐CO2 batteries. Herein, topological defect‐rich graphene (TDG) based materials are developed as metal‐free cathodes for Li‐CO2 batteries, presenting an unprecedented full discharge capacity of over 69 000 mA h g−1 at the current density of 0.5 A g−1, a relatively small voltage gap of 1.87 V (Li/Li+) even at an extremely high current density of 2.0 A g−1, and an excellent long‐term stable cycle life of up to 600 cycles at 1.0 A g−1. The outstanding performance of Li‐CO2 batteries with the TDG cathodic electrocatalyst can be attributed to the introduction of topological defects in the carbon skeleton, providing sufficient active sites for CO2 reduction and evolution to facilitate the formation/decomposition of Li2CO3 during the discharging/charging process. The density functional theory calculations reveal the superiority of the negatively charged C atoms in topological defects as the adsorption for CO2 molecules and the activation sites for the decomposition of Li2CO3, and that the heterocyclic pentagon ring (C5) has a relatively low theoretical potential gap (1.01 V) during the charge and discharge processes. [ABSTRACT FROM AUTHOR]

Published
2021
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80. High‐Performance K–CO2 Batteries Based on Metal‐Free Carbon Electrocatalysts.

Author

Zhang, Wenchao, Hu, Chuangang, Guo, Zaiping, and Dai, Liming

Subjects
*ELECTROCATALYSTS, *ELECTRIC batteries, *POTASSIUM ions, *CHARGE carriers, *ENERGY density, *ENERGY storage
Abstract

Metal–CO2 batteries have attracted much attention owing to their high energy density and use of greenhouse CO2 waste as the energy source. However, the increasing cost of lithium and the low discharge potential of Na–CO2 batteries create obstacles for practical applications of Li/Na–CO2 batteries. Recently, earth‐abundant potassium ions have attracted considerable interest as fast ionic charge carriers for electrochemical energy storage. Herein, we report the first K–CO2 battery with a carbon‐based metal‐free electrocatalyst. The battery shows a higher theoretical discharge potential (E⊖=2.48 V) than that of Na–CO2 batteries (E⊖=2.35 V) and can operate for more than 250 cycles (1500 h) with a cutoff capacity of 300 mA h g−1. Combined DFT calculations and experimental observations revealed a reaction mechanism involving the reversible formation and decomposition of P121/c1‐type K2CO3 at the efficient carbon‐based catalyst. [ABSTRACT FROM AUTHOR]

Published
2020
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