ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Zhenwu Zhong,Xiaoyu Yang,Zhaoxiang Qi,Ke Zhao,Salman Riaz,Ying Qi,Peng Wei,Min Jae Ko,Jian Cheng,Yahong Xie
Carbon-based MAPbI 3 perovskite solar cells (C-PSCs) have attracted significant attention due to their low cost and stable performance. However, due to inherent structural defects and an energy level mismatch between the perovskite layer and the carbon electrode, C-PSCs still show a poorer power conversion efficiency (PCE) than traditional perovskite solar cells (PSCs). In this study, LaFeO 3 @C nanocomposite particles were successfully synthesized via pyrolysis of La-containing MIL-100(Fe) MOF gel. By introducing these pre-synthesized LaFeO 3 @C bimetallic composite oxide nanoparticles into the carbon electrode, the device featuring a FTO/SnO 2 /CH 3 NH 3 PbI 3 /LaFeO 3 @C/C architecture achieved an impressive maximum PCE of 16.35%, surpassing that of the pristine device by 9.36%. The enhanced optoelectronic performance can be primarily attributed to enhanced interfacial contacts, superior interfacial charge extraction ability, and better electrical conductivity . The LaFeO 3 @C-based device maintained more than 90% of the initial PCE after being stored for 31 days at room temperature and ambient humidity. This study provides a novel strategy for the preparation of efficient and stable C-PSCs from the perspective of spatial structure regulation of bimetallic MOF-based composites.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenmiao Zhao,Lishi Mo,Xiaoyuan Shi,Bo Liu,Guangmin Yang,Ting Deng
CoTe 2 as a potential electrode material for sodium-ion batteries (SIBs) suffers severe volume expansion and rapid capacity degradation. Herein, we propose an anionic chemistry regulation strategy to enhance the redox performance of CoTe 2 by Se substitution which creates more porosity inside the structure to accommodate the volume expansion. Physical characterizations and theoretical calculations have studied the structural and dynamical influence of Se/Te ratio on the overall performance. As a result, CoSe 1.33 Te 0.67 @C with a 〈1 1 1〉 preferential growth direction exhibited the most balanced performance, which delivered a high initial specific capacity of 795 mAh/g at 0.05 A/g, a high rate performance of 5 A/g and a capacity retention of 370 mAh/g after 400 cycles at 0.5 A/g. Accordingly, a full SIB was constructed with a Na 3 V 2 (PO 4 ) 3 cathode and a CoSe 0.67 Te 0.33 @C anode, delivering a maximum energy density of 197.2 Wh kg −1 . These results have proved that anionic chemistry regulation is quite efficient to synthesize metal tellurides with high redox activity and long life-span for SIB .
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RSC Advances
·
2015
·Vol. 5
·期 55
·43972-43977
·
IF 3.84
Jun Hu,Dekui Shen,Shiliang Wu,Huiyan Zhang,Rui Xiao
The microwave-assisted cleavage of C–O linkages in benzyl phenyl ether was investigated at 200 °C in the presence of ZrP or SBA-15 doped with or without metal catalyst (Pd/C or Ru/C). The total yield of phenol and benzyl alcohol from benzyl phenyl ether depolymerization with ZrP was 26.91%, while the yield of phenol reached 26.11% for that with Pd/C. Hybrid catalysts performed effectively for promoting the formation of phenol. A conversion of 85.70% was achieved with ZrP–Pd/C catalyst, and the selectivity to phenol reached 47.32%. The highest yield of phenol was obtained at 1 h, and repolymerization was remarkable at longer reaction time. Based on the reaction using phenol and benzyl alcohol as the reactants, benzyl phenyl ether might be decomposed into phenol and benzyl alcohol following with the repolymerization producing thermally stable polymers in the presence of Pd.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2016
·
IF 3.652
Shiliang Wu,Hongwei Yang,Jun Hu,Dekui Shen,Huiyan Zhang,Rui Xiao
In this work, the pyrolysis of furans (furan, 2-methylfuran, furfuryl alcohol , and furfural) have been checked by Py-GC–MS at 1100 °C to detect the decomposition of furans and the formation of benzene derivatives and PAH. From the Py-GC–MS results, different side chain functional groups on furan-ring lead to different kinds of products and product distributions, such as hydroxyl group leading to dimers, and aldehyde group leading to pyrans, but the mechanism for furan-ring opening and decomposition is universal for furans pyrolyzed in this study. In order to explain the experimental results and the formation of benzene derivatives and PAH, the formation of benzene from furan has also been calculated by B3LYP/6-31G + +(d,p). Two possible benzene formation mechanisms, Diels-Alder and acetylene reaction mechanism, have been proposed and calculated. By comparison, it has been regarded that Diels-Alder reaction was more possible for PAH formation as this mechanism has a lower activation energy for initiation step, but acetylene reaction mechanism was more possible for benzene formation as this mechanism has a lower global activation energy.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Xuanxuan Qiao,Aihua Sun,Chongyang Wang,Chengyi Chu,Si Ma,Xiaobing Tang,Jianjun Guo,Gaojie Xu
Highly dispersed hollow Fe 3 O 4 @C nanoparticles with controllable particle sizes were prepared. Hollow Fe 3 O 4 @C nanoparticles were chosen not only because of their low density and high optical contrast, but also because of high refractive index, better optical properties. Corresponding colloidal suspension of hollow Fe 3 O 4 @C photonic crystals in propylene carbonate showed a highly adjustable structure color change upon applying of electric fields. After being stored for 28 days in propylene carbonate solution, these colloidal suspensions can still diffract visible lights when an electric field was applied, which is attributed to low density. Based on the dielectric spectroscopy analysis of hollow Fe 3 O 4 @C and SiO 2 @Fe 3 O 4 @C colloidal suspensions,a dielectric loss model has been proposed to explain the effect of surface properties on the assembly.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yingfang Yao,Yong You,Gaixia Zhang,Jianguo Liu,Haoran Sun,Zhigang Zou,Shuhui Sun
Tuna is one of the most rapid and distant swimmers. Its unique gill structure with the porous lamellae promotes fast oxygen exchange that guarantees tuna’s high metabolic and athletic demands. Inspired by this specific structure, we designed and fabricated microporous graphene nanoplatelets (GNPs)-based Fe/N/C electrocatalysts for oxygen reduction reaction (ORR). Careful control of GNP structure leads to the increment of microporosity, which influences the O2 adsorption positively and desorption oppositely, resulting in enhanced O2 diffusion, while experiencing reduced ORR kinetics. Working in the cathode of proton-exchange membrane fuel cells, the GNP catalysts require a compromise between adsorption/desorption for effective O2 exchange, and as a result, appropriate microporosity is needed. In this work, the highest power density, 521 mW·cm–2, at zero back pressure is achieved.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Lun Pan,Tahir Muhammad,Lu Ma,Zhen-Feng Huang,Songbo Wang,Li Wang,Ji-Jun Zou,Xiangwen Zhang
ZnO is an important semiconductor that has been widely applied in solar cell, photocatalysis, environmental remediation. Doping and morphology control are important approaches to improve its photocatalytic performance. Herein, a facile two-step calcination method was developed to fabricate carbon(C)-doped cubic ZnO with porous structure from zeolite imidazolate frameworks (ZIF-8). Compared with one-step pyrolysis, the approach of two-step calcination not only retains the cubic morphology with inter-connected ZnO nanoparticles and porous structure but also introduces C doping in ZnO lattice effectively. This morphology has advantage in charge transfer, optical absorption and mass transfer during the photoreaction, and C doping results in high charge-separation efficiency. The sample C350-400 (C-doped ZnO, firstly calcined at 350 °C for 2 h from ZIF-8, then 400 °C for 1 h) shows the maximum photoactivity, which is ca . 3-fold and 4-fold higher than ZnO (C450) in photodegradation and PEC water splitting (under UV–vis irradiation), respectively. It is expected that the preparation of metal oxide from MOF is a very promising way to fabricate highly efficient photocatalyst.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 17
·8139-8147
·
IF 2.302
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
When MgO+ZrO 2 were used as a sintering aid to SiC ceramics, it was found that ZrO 2 reacted with SiC and MgO to form ZrC and a magnesium silicate. This reaction may provide a new route to synthesize ZrC or prepare ZrC/SiC composites by reaction sintering using ZrO 2 , SiC, and MgO as starting materials. In the present work, formation process of the ZrC phase in the SiC–MgO–ZrO 2 system was addressed. Subsolidus phase relations at 1550 °C of the SiC–MgO–ZrO 2 system and the related SiC–SiO 2 –ZrC–ZrO 2 –MgO (Si–Zr–Mg–O–C) system were investigated.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Huimin Zhou,Muhammad Awais Naeem,Pengfei Lv,Jin Zhang,Zengyuan Pang,Lei Luo,Yibing Cai,Xin Xia,Qufu Wei
Carbon-coated SnO 2 composite nanofibers has been considered as an efficient way to alleviate the enormous volume change problem of tin-based anodes for lithium ion batteries (LIBs). Herein, porous carbon/SnO 2 nanofibers were prepared via single-needle electrospinning which was followed by carbonization treatment. The procedure involved two categories of precursors of SnO 2, stannic chloride pentahydrate and stannic acetate, whereas former was fully dissolved while later was partially dissolved in solvent, leading to different pore distribution in cooperating with thermal decomposition of polymethyl methacrylate. The pores generated from stannic chloride pentahydrate/polymethyl methacrylate system were randomly distributed on the surface of nanofibers. In the case of stannic acetate/polymethyl methacrylate derived composites, the thermolysis of polymer left multichannels within the nanofibers coupled with SnO 2 nanoparticles . Galvanostatic charge/discharge was carried out to evaluate them as anode materials for LIBs. It was found that multichannel carbon/SnO 2 nanofibers with large specific surface area (34.97 m 2 /g) achieved better rate capability and stable capacity retention of 89.9% after 50 cycles. The longitudinally aligned pores facilitated lithium diffusion and transference, which avoided nonuniform deposition and separation of lithium ions , thereby further enhancing the stability during the discharge/charge process.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Yaqi Ren,Jie Dai,Bo Pang,Xiang Liu,Jie Yu
Isotropically conductive TiC/C hybrid nanofibers (TCCNFs) have been prepared by electrospinning for supercapacitor application for the first time. By changing the atmosphere of stabilization process, the TCCNFs with different TiC contents were successfully synthesized with uniform morphology and average diameter of about 100 nm. The TCCNFs stabilized in Ar contain much more TiC than those stabilized in air. The specific capacitance of the TCCNFs stabilized in Ar and air were measured to be 77.8 F g −1 and 130.0 F g −1 at the current density of 0.1 A g −1 , respectively, which were much higher than the pure TiC nanoparticles and reported carbon materials with similar specific surface area. The charge storage mechanisms were discussed by analyzing the capacitive and diffusion-controlled contributions to the total capacitance. Reversible valance change of Ti atoms was observed during charge/discharge process, indicative of the occurrence of pseudoreaction. The experimental results support that the higher specific capacitance of the TCCNFs may be caused by a synergistic enhancing effect between TiC and carbon. The capacitance retention reaches 98.9% and 93.0% for the TCCNFs stabilized in Ar and air after 25 000 cycles, respectively, showing excellent stability. The present work provides a novel conductive electrode material for supercapacitors with possible pseudocapacitance, worthy of further investigation.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 32
·16695-16707
·
IF 7.443
Dajun Wu,Shaohui Xu,Mai Li,Chi Zhang,Yiping Zhu,Yuwei Xu,Weiwei Zhang,Rong Huang,Ruijuan Qi,Lianwei Wang,Paul K. Chu
A two-step hydrothermal process is designed to synthesize hybrid MnO2/C nano-composites on a macroporous electrically conductive network (MECN) via a redox reaction in a 30 mM KMnO4 solution with carbon microspheres. The microstructure, surface morphology, and electrochemical properties of the MnO2/C coated on MECN are determined systematically. The MnO2 nanoflakes, which are about 40–200 nm, are deposited regularly on the carbon microspheres coated on the MECN electrode. The MnO2 nano-lamellas offer fast ion transport and adsorption–desorption to/from the MnO2 surface, and the microporous carbon microspheres enhance the electrical storage and ion transfer. The in situ growth of MnO2 on the carbon microspheres on the MECN substrate leads to a small contact resistance and short current transfer length. The materials are demonstrated to be excellent electrodes in supercapacitors boasting a high capacitance of 497 F g−1 at 1 A g−1 with a 1 cm2 electrode and excellent long-term cycling stability over 5000 cycles in 1 M Na2SO4. The MnO2/C/MECN||active carbon/Ni-foam asymmetrical supercapacitors (ASCs) deliver an energy density of 0.50 mW h cm−3 (55.5 W h kg−1 at a power density of 4000 W kg−1) with 87.6% retention of the specific capacitance after 5000 cycles.
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JOURNAL OF BIOLOGICAL CHEMISTRY
·
2013
·Vol. 289
·期 6
·3339-3351
·
IF 4.651
Weihua Tian,Yu Wang,Yan Xu,Xiangpeng Guo,Bo Wang,Li Sun,Longqi Liu,Fenggong Cui,Qiang Zhuang,Xichen Bao,Gunnar Schley,Tung-Liang Chung,Andrew L. Laslett,Carsten Willam,Baoming Qin,Patrick H. Maxwell,Miguel A. Esteban
Megadose vitamin C (Vc) is one of the most enduring alternative treatments for diverse human diseases and is deeply engrafted in popular culture. Preliminary studies in the 1970s described potent effects of Vc on prolonging the survival of patients with terminal cancer, but these claims were later criticized. An improved knowledge of the pharmacokinetics of Vc and recent reports using cancer cell lines have renewed the interest in this subject. Despite these findings, using Vc as an adjuvant for anticancer therapy remains questionable, among other things because there is no proper mechanistic understanding. Here, we show that a Warburg effect triggered by activation of the hypoxia-inducible factor (HIF) pathway greatly enhances Vc-induced toxicity in multiple cancer cell lines, including von Hippel-Lindau (VHL)-defective renal cancer cells. HIF increases the intracellular uptake of oxidized Vc through its transcriptional target glucose transporter 1 (GLUT1), synergizing with the uptake of its reduced form through sodium-dependent Vc transporters. The resulting high levels of intracellular Vc induce oxidative stress and massive DNA damage, which then causes metabolic exhaustion by depleting cellular ATP reserves. HIF-positive cells are particularly sensitive to Vc-induced ATP reduction because they mostly rely on the rather inefficient glycolytic pathway for energy production. Thus, our experiments link Vc-induced toxicity and cancer metabolism, providing a new explanation for the preferential effect of Vc on cancer cells.
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