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345 results on '"Hu, Shu‐Fen"'

119. All-Solid-State Li-Ion Battery Using Li1.5Al0.5Ge1.5(PO4)3As Electrolyte Without Polymer Interfacial Adhesion

Author

Meesala, Yedukondalu, Chen, Chen-Yu, Jena, Anirudha, Liao, Yu-Kai, Hu, Shu-Fen, Chang, Ho, and Liu, Ru-Shi

Abstract

Solid-state lithium-ion batteries are promising candidates for energy storage devices that meet the requirements to reduce CO2emissions. NASICON-type solid-state electrolytes (SSE) are most promising materials as electrolytes for high-performance lithium ion batteries because of their good stability and high ionic conductivity. In this study, we successfully fabricate NASICON-based Li1.5Al0.5Ge1.5(PO4)3lithium fast-ion conductors through melt-quenching with post-crystallization. The effect of crystallization temperature on the structure of LAGP and their ionic conductivity is systematically studied using Rietveld analysis of Synchrotron X-ray powder diffraction patterns, multinuclear magnetic resonance, and electrochemical analysis, revealing that the mobility of Li ion is dependent on crystallization temperature. The glass–ceramic LAGP annealed at 800 °C for 8 h exhibits the highest conductivity of 0.5 mS cm–1at room temperature. Moreover, we report the viability of the prepared LAGP glass−ceramic as a solid electrolyte in Li-ion batteries without polymer adhesion. The cycling of Li/LAGP/LFP all-solid-state cell, provides a stable cycling lifetime of up to 50 cycles. This approach demonstrates that LAGP glass–ceramic can have good contact with the electrodes without interfacial layer and can deliver a reasonable discharge capacity after 50 cycles.

Published
2018
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125. An integrated cobalt disulfide (CoS2) co-catalyst passivation layer on silicon microwires for photoelectrochemical hydrogen evolution.

Author

Chen, Chih-Jung, Chen, Po-Tzu, Basu, Mrinmoyee, Yang, Kai-Chih, Lu, Ying-Rui, Dong, Chung-Li, Ma, Chong-Geng, Shen, Chin-Chang, Hu, Shu-Fen, and Liu, Ru-Shi

Abstract

An integrated cobalt disulfide (CoS2) co-catalyst passivation layer on Si microwires (MWs) was used as a photocathode for solar hydrogen evolution. Si MWs were prepared by photolithography and dry etching techniques. The CoS2–Si photocathodes were subsequently prepared by chemical deposition and thermal sulfidation of the Co(OH)2 outer shell. The optimized onset potential and photocurrent of the CoS2–Si electrode were 0.248 V and −3.22 mA cm−2 (at 0 V), respectively. The best photocatalytic activity of the CoS2–Si electrode resulted from lower charge transfer resistances among the photoabsorber, co-catalyst, and redox couples in the electrolyte. X-ray absorption near edge structure was conducted to investigate the unoccupied electronic states of the CoS2 layer. We propose that more vacancies in the S-3p unoccupied states of the CoS2–Si electrode were present with a lower negative charge of S22− to form weaker S–H bond strength, promoting water splitting efficiency. Moreover, the CoS2 co-catalyst that completely covered underlying Si MWs served as a passivation layer to prevent oxidation and reduce degradation during photoelectrochemical measurements. Therefore, the optimal CoS2–Si electrode maintained the photocurrent at about −3 mA cm−2 (at 0 V) for 9 h, and its hydrogen generation rate was approximately 0.833 μmol min−1. [ABSTRACT FROM AUTHOR]

Published
2015
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