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Hydrothermal Synthesis and Electrochemical Property of Self-Assembly K10 [H2W12O42] · 10H2O Nanorod
Xingang Kong,Wen Li,Liyun Cao,Jianfeng Huang,Jianpeng Wu,Jie Fei,Jiayin Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.6
Using KOH and WO3 as raw materials, K10[H2W12O42] · 10H2O nanorod was successfully synthesized via controlling the pH value and the K/W mole ratio of hydrothermal system. The structure and morphology of the samples were characterized by XRD, SEM, TEM, HRTEM and selected area electron diffraction (SAED). The size of K10[H2W12O42] · 10H2O nanorod was about 300 nm in width and 3–10 µm in length. The nanorod consisted of self-assembly nanowires with about 10 nm in width. Moreover, the electrochemical performance of K10[H2W12O42] · 10H2O as anode material was investigated, indicating that the as-prepared sample electrode possessed a certain ability of lithium ion insertion/extraction, and exhibited a high initial discharge capacity of 310 mAh g-1.
Yayi Cheng,Jianfeng Huang,Liyun Cao,Yongfeng Wang,Ying Ma,Shaohua Xi,Bingyao Shi,Hui Xie,Jiayin Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.15 No.01
SnSe2 and SnSe nanocrystals were prepared using a simple solvothermal method by changing the molar ratio of SnCl2 · 2H2O and Se powder. When SnSe2 and SnSe are acted as lithium ion battery anodes, the SnSe hybrid structure shows more excellent electrochemical performance than that of SnSe2 interconnected nanosheet. It delivers a reversible capacity of 1023 mA h g -1 at a current density of 200 mA g -1, and maintaining a capacity of 498 mA h g -1 till 120 cycles. According to many present works, SnSe2 with interconnected thin nanosheet should possess more superior property than hybrid structured SnSe due to short charge transfer paths. However, in our research, the result is the opposite. Therefore, we consider that the superior electrochemical performance of SnSe is attributed to its highly reversible conversion reaction mechanism than SnSe2.
Hao Wang,Liang Wang,Wenfeng Shen,Ke Cao,Lei Sun,Pengju Wang,Liyun Cui 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
Recycled concrete powder (RCP) recycling can reduce the consumption of natural resources, which has been highlighted as an ecofriendly and sustainable approach. The alkali-activated slag (AAS) offers notable prospects for replacing conventional Portland cement binders. In this study, we partially replaced granulated blast furnace slag (GBFS) with RCP to prepare the AAS mortars. We evaluated the effect of RCP replacement levels and fineness levels on compressive strength, early hydration process, and pore structure pertaining to AAS mortars with RCP (RCP-AAS mortars). According to the experimental results, using 10 – 30% RCP inside AAS mortars enhanced the compressive strength at 1 day, and the improvement was obvious with increasing RCP fineness. The RCP delayed the early-age hydration of the GBFS, decreased the content of hydration products and increased the total porosity. Therefore, it exhibited a negative effect on 28-day compressive strength. These drawbacks of RCP, however, could be modified by increasing its fineness.
Hao Wang,Liang Wang,Xin Qian,Ke Cao,Ying Xu,Yi Fang,Liyun Cui 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9
Grinding brick waste into powder for use as a supplementary cementitious material has shown to be a promising recycling method for the reuse of construction and demolition waste.However, the strength and durability of concrete containing recycled brick powder (RBP) will significantly decrease due to the poor pozzolanic activity of RBP, limiting its wider applications. This study attempted to overcome these defects through metakaolin (MK) addition. The hydration, compressive strength, durability, and environmental impact of eco-friendly mortars containing RBP and MK were investigated. The results showed that MK promoted the early-stage hydration of cement, creating a suitable hydration environment for the hydration of RBP at a later age. As a result, the volume fractions of low-density calcium silicate hydrate (C-S-H) and high-density C-S-H increased according to the nanoindentation test results. In addition, the strength, chloride penetration resistance, and reinforcement bar corrosion resistance of the blended mortars obviously improved due to the synergistic effect of RBP and MK. Lastly, we achieved CO2 emissions that were 22.1 – 30.2% lower and energy consumption that was 21.4 – 27.0% lower by incorporating 20% RBP and 5 – 15% MK.