10 Jan 2019. our work "Insights into Dynamic Molecular Intercalation Mechanism for Al-C Battery by Operando Synchrotron X-ray Techniques" has been accepted by Carbon

Recently, a novel rechargeable Al ion battery (AIB) with high performance has been developed. Owing to its low cost, high-rate capability, excellent cyclability, and non-flammability, AIB provides a safe alternative to many commercial batteries used in the energy storage system. To improve its performance, identifying molecular structure and arrangement of chloroaluminate anion (AlCl4) intercalated in the graphite layer remains a great challenge. In this work, operando analysis of X-ray diffraction (XRD) measurement and X-ray absorption (XAS) spectroscopy were performed to investigate the intercalation of AlCl4 anion and related molecular arrangement in the graphite layers. The intercalated stage and intercalant gallery height of graphite cathode electrode during AIB battery operation were observed to be stage 3 and 9.22 Å, respectively. Furthermore, the spectral evolution from ex-situ XAS at the Al and Cl K-edge was associated with closely packed intercalation of AlCl4- molecules. With density functional theory (DFT) calculation, three simulated models of intercalated AlCl4 molecules in the graphite layer were revealed successfully, which explained possible molecular structures at different charging states. This analytical methodology paves the way for better understanding the structural transformation of molecular ions de-/ intercalation in graphite layers.

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9 Jan 2019. our work "Enhanced Luminescence and Stability of Cesium Lead Halide Perovskite CsPbX3 Nanocrystals by Cu2- Assisted Anion Exchange Reactions has been accepted by The Journal of Physical Chemistry C

Inorganic CsPbX3 perovskite nanocrystals (NCs) have exhibited great optical properties, such as tunable emission wavelength, narrow emission line-widths, and high photoluminescent quantum yields. However, the unstable crystal structure of perovskite CsPbX3 NCs lead to a deterioration in optical performance. In this work, it is demonstrated that inorganic perovskite NCs, including CsPbCl3 and CsPbBr3-xClx NCs with excellent photoluminescence quantum yield and optical stability can be improved via anion exchange reaction treated with a new halide precursor consisting of copper halide (CuX2)-oleylamine (OLA) complexes. Unlike traditional perovskite synthesized processes for better crystalline structures operated at high temperatures, this work offers an economical method operable at the room temperatures. The treated CsPbX3 perovskite nanocrystals were characterized by in situ photoluminescence (PL) spectra and in-situ X-ray diffraction (XRD) and exhibited stable crystalline structures and enhanced photoluminescence. Cu2+ ions were only absorbed on the surface of perovskite NCs confirmed by the X-ray absorption spectroscopy (XAS) analysis. Density functional theory calculation explained that the origin of high stability and good crystallinity for treated perovskite NCs stemmed from adsorption of CuCl2 on perovskite’s surface to passivate defect sites during the recrystallization process.

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Advanced Rechargeable Aluminum Ion Battery with a High Quality Natural Graphite Cathode

Di-Yan Wang,1,2,3 Chuan-Yu Wei,1,4 Meng-Chang Lin,3,5Chun-Jern Pan,3,6 Hung-Lung Chou,7 Hsin-An Chen,4Ming Gong,3 Yingpeng Wu,3 Chunze Yuan,3 Michael Angell,3 Yu-Ju Hsieh,1 Yu-Hsun Chen,1Cheng-Yen Wen,4 Chun-Wei Chen,4 Bing-Joe Hwang,6,8* Chia-Chun Chen,1,9* Hongjie Dai3*

Nature Communications 2017, 8, 14283



Recently interest in aluminum ion batteries with aluminum anodes, graphite cathodes and ionic liquid electrolytes has increased; however much remains to be done to increase the cathode capacity and to understand details of the anion-graphite intercalation mechanism. In this study an aluminum-ion-battery cell, made using pristine natural graphite flakes,achieves a specific capacity of ~110 mAhg-1 with Coulombic efficiency~98%, at a current density of 99 mAg-1(0.9C) with clear discharge voltage plateaus (2.25 to 2.0V and 1.9 to 1.5V). The cell has a capacity of 60 mAhg-1 at 6C, over 6000 cycles with Coulombic efficiency~99%. Raman spectroscopy showes two  different intercalation processes involving chloroaluminateanions at the two discharging plateaus, while C-Cl bonding on the surface, or edges of nature graphite, is found using X-ray absorption spectroscopy. Finally, theoretical calculations are employed to investigate the intercalation behavior of choloraluminate anions in the graphite electrode.

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Dec. 4 2016, Congratulations "Hsiang-Ju receive an excellent poster award in 2016化學年會"

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Our manuscript "Improving Hydrogen Evolution Activity of Earth-abundant Cobalt-doped Iron Pyrite Catalysts by Surface Modification with Phosphide" has been accepted by Small
Tsung-Rong Kuo, Wei-Ting Chen, Hsiang-Ju Liao, Yu-Hsiu Yang, Ting-Wei Liao,Cheng-Yen Wen, Chia-Chun Chen,* Di-Yan Wang*


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