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Bismuth Oxychloride/MXene symmetric supercapacitor with high volumetric energy density
Xia, Qi Xun,Shinde, Nanasaheb M.,Yun, Je Moon,Zhang, Tengfei,Mane, Rajaram S.,Mathur, Sanjay,Kim, Kwang Ho Elsevier 2018 ELECTROCHIMICA ACTA Vol.271 No.-
<P><B>Abstract</B></P> <P>Since the discovery of two-dimensional (2D) graphene, a new class of 2D materials with excellent electrical conductivity has recently been attracting attention in studying promising electrode materials in energy storage applications. Herein, bismuth oxychloride nanosheets-immobilised Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene material (TCBOC) is synthesised by a facile and cost-effective chemical bath deposition (CBD) route. The bismuth oxychloride (BiOCl) nanosheets are grown and immobilised on surfaces of Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB>-MXene flakes. An electrode based on the TCBOC nanocomposite exhibited a remarkably volumetric specific capacitance of 396.5 F cm<SUP>-3</SUP> at 1 A g<SUP>−1</SUP> and 228.0 F cm<SUP>-3</SUP> at 15 A g<SUP>−1</SUP>. Furthermore, a symmetric supercapacitor (SSC) assembled using TCBOC material proves to have a high energy density of 15.2 Wh kg<SUP>−1</SUP> at a power density of 567.4 W kg<SUP>−1</SUP> compared to SSCs using previously reported Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene materials. The SSC shows cycle life retention of 85.0% after 5000 cycles (at 5 A g<SUP>−1</SUP>). The enhanced capacitive performance is attributed to the increased surface area due to BiOCl nanosheets anchored on a 2D MXene surface, the activities of BiOCl sheets, and the excellent conductivity of a Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene material.</P>
Xia, Qi Xun,San Hui, Kwan,Hui, Kwun Nam,Kim, Sung Dae,Lim, Jae Hong,Choi, Si Young,Zhang, Luo Jiang,Mane, Rajaram S.,Yun, Je Moon,Kim, Kwang Ho The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.44
<▼1><P>Well dispersed MnCO3 quantum dots (∼1.2 nm) decorated on Ni(HCO3)2–MnCO3 as a cathode electrode for high performance supercapacitors.</P></▼1><▼2><P>We have developed a high performance supercapacitor cathode electrode composed of well dispersed MnCO3 quantum dots (QDs, ∼1.2 nm) decorated on nickel hydrogen carbonate–manganese carbonate (Ni(HCO3)2–MnCO3) hedgehog-like shell@needle (MnCO3 QDs/NiH–Mn–CO3) composites directly grown onto a 3D macro-porous nickel foam as a binder-free supercapacitor electrode by a facile and scalable hydrothermal method. The MnCO3 QDs/NiH–Mn–CO3 composite electrode exhibited a remarkable maximum specific capacitance of 2641.3 F g<SUP>−1</SUP> at 3 A g<SUP>−1</SUP> and 1493.3 F g<SUP>−1</SUP> at 15 A g<SUP>−1</SUP>. Moreover, the asymmetric supercapacitor with MnCO3 QDs/NiH–Mn–CO3 composites as the positive electrode and graphene as the negative electrode showed an energy density of 58.1 W h kg<SUP>−1</SUP> at a power density of 900 W kg<SUP>−1</SUP> as well as excellent cycling stability with 91.3% retention after 10 000 cycles, which exceeded the energy densities of most previously reported nickel or manganese oxide/hydroxide-based asymmetric supercapacitors. The ultrahigh capacitive performance is attributed to the presence of the high surface area core–shell nanostructure, the well dispersed MnCO3 quantum dots, and the high conductivity of MnCO3 quantum dots as well as the synergetic effect between multiple transition metal ions. The superior supercapacitive performance of the MnCO3 QDs/NiH–Mn–CO3 composites makes them promising cathode materials for high energy density asymmetric supercapacitors.</P></▼2>
Seawater electrolyte-mediated high volumetric MXene-based electrochemical symmetric supercapacitors
Xia, Qi Xun,Shinde, Nanasaheb M.,Zhang, Tengfei,Yun, Je Moon,Zhou, Aiguo,Mane, Rajaram S.,Mathur, Sanjay,Kim, Kwang Ho The Royal Society of Chemistry 2018 Dalton Transactions Vol.47 No.26
<P>The structure and morphology of titanium carbide (Ti3C2Tx) MXene, a new class of two dimensional (2D) materials, are investigated and reported. Ti3AlC2 MAX, treated with a hydrofluoric acid etching process, is used as a promising electrode material for electrochemical supercapacitor studies. The electrochemical supercapacitor performance of Ti3C2Tx as a negatrode in a natural seawater electrolyte solution, tested in a three-electrode system, demonstrated a specific capacitance of 67.7 F g<SUP>−1</SUP> at a current density of 1 A g<SUP>−1</SUP> which is in accordance with the volumetric specific capacitance of 121.8 F cm<SUP>−3</SUP>. A symmetric supercapacitor assembled with a Ti3C2Tx//Ti3C2Tx electrode configuration revealed a volumetric specific capacitance of 27.4 F cm<SUP>−3</SUP> at 0.25 A g<SUP>−1</SUP>, and 96.6% capacitance retention even after 5000 cycles, which is superior to those reported previously in similar systems, suggesting the importance of abundant and cost-effective seawater as a natural electrolyte in developing energy storage devices.</P>
Provably Secure Aggregate Signcryption Scheme
Xun-Yi Ren,Zheng-Hua Qi,Yang Geng 한국전자통신연구원 2012 ETRI Journal Vol.34 No.3
An aggregate signature scheme is a digital signature scheme that allows aggregation of n distinct signatures by n distinct users on n distinct messages. In this paper, we present an aggregate signcryption scheme (ASC) that is useful for reducing the size of certification chains (by aggregating all signatures in the chain) and for reducing message size in secure routing protocols. The new ASC scheme combines identity-based encryption and the aggregation of signatures in a practical way that can simultaneously satisfy the security requirements for confidentiality and authentication. We formally prove the security of the new scheme in a random oracle model with respect to security properties IND-CCA2, AUTH-CMA2,and EUF-CMA.
NMAAP1 Expressed in BCG-Activated Macrophage Promotes M1 Macrophage Polarization
Qihui Liu,Xun Zhu,Yuan Tian,Xiangfeng Zhao,Haifeng Jing,Qi Xie,Peng Li,Dong Li,Dongmei Yan 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.10
Macrophages are divided into two subpopulations: classically activated macrophages (M1) and alternatively activated macrophages (M2). BCG (Bacilli Calmette-Guérin) activates disabled naïve macrophages to M1 macrophages, which act as inflammatory, microbicidal and tumoricidal cells through cell-cell contact and/or the release of soluble factors. Various transcription factors and signaling pathways are involved in the regulation of macrophage activation and polarization. We discovered that BCG-activated macrophages (BAM) expressed a new molecule, and we named it Novel Macrophage Activated Associated Protein 1 (NMAAP1). 1 The current study found that the overexpression of NMAAP1 in macrophages results in M1 polarization with increased expression levels of M1 genes, such as inducible nitric oxide synthase (iNOS), tumor necrosis factor alpha (TNF-α), Interleukin 6 (IL-6), Interleukin 12 (IL-12), Monocyte chemoattractant protein-1 (MCP-1) and Interleukin-1 beta (IL-1β), and decreased expression of some M2 genes, such as Kruppel-like factor 4 (KLF4) and suppressor of cytokine signaling 1 (SOCS1), but not other M2 genes, including arginase-1 (Arg-1), Interleukin (IL-10), transforming growth factor beta (TGF-β) and found in inflammatory zone 1 (Fizz1). Moreover, NMAAP1 overexpression in the RAW264.7 cell line increased cytotoxicity against MCA207 tumor cells, which depends on increased inflammatory cytokines rather than cell-cell contact. NMAAP1 also substantially enhanced the phagocytic ability of macrophages, which implies that NMAAP1 promoted macrophage adhesive and clearance activities. Our results indicate that NMAAP1 is an essential molecule that modulates macrophages phenotype and plays an important role in macrophage tumoricidal functions.
Peng Pengfei,Yue Xun,Tang Lu,Wu Xi,Deng Qiao,Wu Tao,Cai Lei,Liu Qi,Xu Jian,Huang Xiaoqi,Chen Yucheng,Diao Kaiyue,Sun Jiayu 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.12
Objective: To clinically validate the feasibility and accuracy of cine images acquired through the multitasking method, with no electrocardiogram gating and free-breathing, in measuring left ventricular (LV) function indices by comparing them with those acquired through the balanced steady-state free precession (bSSFP) method, with multiple breath-holds and electrocardiogram gating. Materials and Methods: Forty-three healthy volunteers (female:male, 30:13; mean age, 23.1 ± 2.3 years) and 36 patients requiring an assessment of LV function for various clinical indications (female:male, 22:14; 57.8 ± 11.3 years) were enrolled in this prospective study. Each participant underwent cardiac magnetic resonance imaging (MRI) using the multiple breath-hold bSSFP method and free-breathing multitasking method. LV function parameters were measured for both MRI methods. Image quality was assessed through subjective image quality scores (1 to 5) and calculation of the contrast-to-noise ratio (CNR) between the myocardium and blood pool. Differences between the two MRI methods were analyzed using the Bland–Altman plot, paired t-test, or Wilcoxon signed-rank test, as appropriate. Results: LV ejection fraction (LVEF) was not significantly different between the two MRI methods (P = 0.222 in healthy volunteers and P = 0.343 in patients). LV end-diastolic mass was slightly overestimated with multitasking in both healthy volunteers (multitasking vs. bSSFP, 60.5 ± 10.7 g vs. 58.0 ± 10.4 g, respectively; P < 0.001) and patients (69.4 ± 18.1 g vs. 66.8 ± 18.0 g, respectively; P = 0.003). Acceptable and comparable image quality was achieved for both MRI methods (multitasking vs. bSSFP, 4.5 ± 0.7 vs. 4.6 ± 0.6, respectively; P = 0.203). The CNR between the myocardium and blood pool showed no significant differences between the two MRI methods (18.89 ± 6.65 vs. 18.19 ± 5.83, respectively; P = 0.480). Conclusion: Multitasking-derived cine images obtained without electrocardiogram gating and breath-holding achieved similar image quality and accurate quantification of LVEF in healthy volunteers and patients.
Shinde, N. M.,Xia, Qi Xun,Yun, Je Moon,Singh, Saurabh,Mane, Rajaram S.,Kim, Kwang-Ho Royal Society of Chemistry 2017 Dalton Transactions Vol. No.
<▼1><P>The synthesis and asymmetric supercapacitor application of a bismuth oxide (Bi2O3) electrode consisting of arranged nano-platelets for evolving a flower-type surface appearance on nickel-foam (Bi2O3–Ni–F) are described.</P></▼1><▼2><P>The present study involves the synthesis of a bismuth oxide (Bi2O3) electrode consisting of an arranged nano-platelets for evolving a flower-type surface appearance on nickel-foam (Bi2O3–Ni–F) by a simple, inexpensive, binder-free and one-step chemical bath deposition (CBD) method, popularly known as a wet chemical method. The as-prepared Bi2O3 on Ni-foam, as an electrode material, demonstrates 557 F g<SUP>−1</SUP> specific capacitance (SC, at 1 mA cm<SUP>−2</SUP>), of which 85% is retained even after 2000 cycles. With specific power density of 500 kW kg<SUP>−1</SUP>, the Bi2O3–Ni–F electrode documents a specific energy density of 80 Wh kg<SUP>−1</SUP>. Furthermore, a portable asymmetric supercapacitor device, <I>i.e.</I> a pencil-type cell consisting of Bi2O3–Ni–F as an anode and graphite as a cathode in 6 M KOH aqueous electrolyte solution, confirms 11 Wh kg<SUP>−1</SUP> and 720 kW kg<SUP>−1</SUP> specific energy and specific power densities, respectively. An easy and a simple synthesis approach for manufacturing a portable laboratory scale pencil-type supercapacitor device is a major outcome of this study, which can also be applied for ternary and quaternary metal oxides for recording an enhanced performance. In addition, we presented a demonstration of lighting a light emitting diode (LED) using a home-made pencil-type supercapacitor device which, finally, has confirmed the scaling and technical potentiality of Bi2O3–Ni–F in energy storage devices.</P></▼2>
Shinde, Nanasaheb M.,Xia, Qi Xun,Yun, Je Moon,Shinde, Pritamkumar V.,Shaikh, Shoyebmohamad M.,Sahoo, Rakesh K.,Mathur, Sanjay,Mane, Rajaram S.,Kim, Kwang Ho Elsevier 2019 ELECTROCHIMICA ACTA Vol.296 No.-
<P><B>Abstract</B></P> <P>Polycrystalline and mesoporous bismuth oxide (Bi<SUB>2</SUB>O<SUB>3</SUB>) micro-sponge-balls of 4–7 μm in diameter comprising of 58–65 (±2) nm upright standing petals, separated by 100–700 (±50) nm crevices, are synthesized directly onto 3D Ni-foam at room-temperature (27 °C) using Tritonx-100 surfactant-mediated soft wet chemical method. After knowing the phase purity, surface area, pore-size distribution, micro-sponge-ball-type surface morphology, elemental analysis and binding energy confirmations of Bi<SUB>2</SUB>O<SUB>3</SUB>, a material with quasi-faradaic redox reactions responsible for supercapattery type behavior, are measured and explored. At a low scan rate, the specific capacitance of Bi<SUB>2</SUB>O<SUB>3</SUB> sponge-ball electrode, measured from 0.4 to 1.80 A g<SUP>−1</SUP> current density, decreases from 559 to 211 F g<SUP>−1</SUP> which is equivalent to a capacity from 155 to 58 mAh.g<SUP>−1</SUP>. An asymmetric supercapacitor (ASC) device assembly of Bi<SUB>2</SUB>O<SUB>3</SUB> sponge-ball electrode with graphite i.e. Bi<SUB>2</SUB>O<SUB>3</SUB>//graphite demonstrates excellent electrochemical properties with 8 Wh kg<SUP>−1</SUP> energy density at 2040 W kg<SUP>−1</SUP> power density, and about 80% cycling retention over 5000 redox cycle operations. A demonstration of LED with full-bright intensity during discharge process of the Bi<SUB>2</SUB>O<SUB>3</SUB>//graphite ASC device suggests its practical potentiality and industrial viability.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Damin,Xia, Qi Xun,Mane, Rajaram S.,Yun, Je Moon,Kim, Kwang Ho ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.722 No.-
<P><B>Abstract</B></P> <P>Mesoporous nickel and cobalt hydroxide composites are directly grown onto 3D macro-porous Ni foam as a binder-free electrode for supercapacitors by using the successive ionic layer adsorption and reaction (SILAR) method. This method is the cheapest and simplest among several deposition processes for supercapacitor applications. An as-obtained porous NiCo(OH)<SUB>2</SUB> electrode exhibits a remarkable specific capacity (1113.6 mAh g<SUP>−1</SUP> at a current density of 3 A g<SUP>−1</SUP>) and excellent cycling stability (85.62% capacity retention after 5000 cycles). Furthermore, an asymmetric supercapacitor assembled with NiCo(OH)<SUB>2</SUB> as a positive electrode and graphene as a negative electrode shows a high energy density of 20.07 W h kg<SUP>−1</SUP> at a power density of 2302.73 W kg<SUP>−1</SUP> and excellent cycling stability (76.46% retention after 5000 cycles). As a result, it shows that the NiCo(OH)<SUB>2</SUB> fabricated by the SILAR method can be a promising electrode towards energy-storage devices with high energy and power densities.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SILAR method is a process conducted under mild conditions for 30 s. </LI> <LI> NiCo(OH)<SUB>2</SUB> composite by SILAR method is a 3D flower-like porous nanostructure. </LI> <LI> The synthesized NiCo(OH)<SUB>2</SUB> electrode shows high electrochemical performances. </LI> <LI> The specific capacity of the NiCo(OH)<SUB>2</SUB> electrode is 1113.6 mAh g<SUP>−1</SUP> at 3 A g<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Xiong, Hai-Lin,Liu, Xun-Qi,Sun, Ai-Hua,He, Ying,Li, Jun,Xia, Yuan Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Associations of P16, MGMT, hMLH1 and hMLH2 with gastric cancer and their relation with MTHFR status in gastric patients who were confirmed with pathological diagnosis were assessed. Aberrant DNA methylation of P16, MGMT, hMLH1 and hMLH2 and polymorphisms of MTHFR C677T were assayed. The proportional DNA hypermethylation in P16, MGMT, hMLH1 and hMLH2 in cancer tissues was significantly higher than in remote normal-appearing tissues. DNA hypermethylation of P16 and MGMT was correlated with the T and N stages. Individuals with homozygotes (TT) of MTHFR C677T had significant risk of hypermethylation of MGMT in cancer tissues [OR (95% CI)= 3.47(1.41-7.93)]. However, we did not find association between polymorphism in MTHFR C677T and risk of hypermethylation in P16, MGMT, hMLH1 and hMLH2 genes either in cancer or remote normal-appearing tissues. Aberrant hypermethylation of P16, MGMT, hMLH1 and hMLH2 could be predictive of gastric cancer.