JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 10
·2727-2736
·
IF 2.5
Wu Bingxue,Zhang Jian,Yang Zhi,Lu Xuanlin,Zhao Xin,Liu Wen,Chen Jiaxuan,Zhao Yicheng,Li Yongdan
Ni-based cermets are the most widely used anode materials for solid oxide fuel cells. Reducing the content of Ni is beneficial to anode stability but usually unfavorable for the catalytic activity. In this study, Ni-Ce 0.8 Sm 0.2 O 2-δ anode with a low Ni content is synthesized through a polymer-directed evaporation-induced self-assembly strategy. Ni distributes evenly in the anode, resulting in an enlarged triple-phase boundary region and improved reactivity of lattice oxygen in the oxide phase. The anode containing 5 wt.% Ni possesses the highest amounts of oxygen vacancies and Ce 3+ /Ce 4+ redox pairs that facilitates the charge transfer process, which is one of the rate-determining steps of anode reaction. Consequently, that anode shows the lowest polarization resistance of 0.014 Ω cm 2 at 700 °C, much lower than those of other Ni-based anodes prepared through conventional techniques such as impregnation and solid-mixing. With that anode, a single cell supported by a 480-μm-thick Ce 0.8 Sm 0.2 O 2-δ electrolyte layer exhibits the maximum power density of 270 mW cm −2 at 700 °C. The anode also shows a promising stability.
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CELLULOSE
·
2023
·Vol. 30
·期 11
·7205-7220
·
IF 5.7
Wei Ning,Zhang Sufeng,Yao Xue,Zhou Qiusheng
In light of the resplendent prospect of water electrolysis, the development of cost-effective, robust and efficient hydrogen/oxygen evolution reactions (HER/OER) bifunctional electrocatalysts is a major challenging task. Herein, RuNi heterojunction alloy decorated cellulose filter (RuNi/CF) as bifunctional electrocatalysts for OER and HER to boost water splitting was successfully synthesized through a two-step of electroless plating and electrodeposition. Benefiting from the unique structure and well-designed electronic engineering of RuNi alloy decorated on cellulose filter, RuNi/CF exhibits outstanding performance for water splitting as a bifunctional electrocatalyst. Density functional theory (DFT) calculation proves that the introduction of Ru makes the electrons around Ni rearrange, which in turn changes the density of the electron cloud around Ni. In alkaline media, the as-prepared Ru 10 Ni/CF displays a very low overpotential of 370 mV to deliver 100 mA/cm 2 with the corresponding Tafel slope of 149 mV/dec for OER. Moreover, it required a small overpotential of 64 mV to carry out a current density of 10 mA/cm 2 for HER. As a result, the assembled water splitting electrolyzer with the Ru 10 Ni/CF shows a very low voltage of 1.56 V to reach 10 mA/cm 2 at alkaline conditions. The cellulose-based self-supporting electrode exhibits abundant HER and OER highly active sites and a robust 3D network structure, especially the electronic structure adjustment from the accumulation of bimetals, which together promote electron transport, resulting in excellent catalytic activity and durability in water splitting. The work may provide insights for the innovative strategy of noble metal electrocatalysts for water splitting.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·1-9
·
IF 4.6
Zhang Yige,Xie Xiaowen,Liu Jianliang,Tang Boyuan,Fang Can,Liu Xiaoming,Dai Zhifeng,Xiong Yubing
Stimulus-responsive ionic liquids have gained significant attention for their applications in various areas. Herein, three kinds of azobenzimidazole ionic liquids with reversible photo-induced conductivity regulation were designed and synthesized. The change of electrical conductivity under UV/visible light irradiation in aqueous solution was studied, and the effect of chemical structure and concentration of ionic liquids containing azobenzene to the regulation of photoresponse conductivity were discussed. The results showed that exposing the ionic liquid aqueous solution to ultraviolet light significantly increased its conductivity. Ionic liquids with longer alkyl chains exhibited an even greater increase in conductivity, up to 75.5%. Then under the irradiation of visible light, the electrical conductivity of the solution returned to its initial value. Further exploration of the mechanism of the reversible photo-induced conductivity regulation of azobenzene ionic liquids aqueous solution indicated that this may attributed to the formation/dissociation of ionic liquids aggregates in aqueous solution induced by the isomerization of azobenzene under UV/visible light irradiation and resulted the reversible conductivity regulation. This work provides a way for the molecular designing and performance regulation of photo-responsive ionic liquid and were expected to be applied in devices with photoconductive switching and micro photocontrol properties.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 8
·1-13
·
IF 2.5
Zhu Jiantao,Wen He,Han Wei,Ma Jiantai,Zhang Feng,Liu Chaowei
The growing concern about the environmental consequences of anthropogenic CO 2 emissions significantly stimulated the research of low-cost, efficient, and recyclable solid adsorbents of CO 2 capture. Metal–organic frameworks (MOFs) are a promising porous material for CO 2 adsorption. Hybrid materials consisting in copper benzene-1,3,5-tricarboxylate (Cu-BTC) and Cu doped graphitic-carbon nitride (Cu-g-C 3 N 4 ) were prepared through solvothermal method as CO 2 adsorbent. The size range of Cu-BTC@1.8%Cu-g-C 3 N 4 was 9.0 ~ 19.4 μm, which was lower than the size range of Cu-BTC (14.6 ~ 29.6 μm). The hybrid adsorbents had lower Brunauer–Emmett–Teller (BET) surface areas and pole volume due to the combination with Cu-g-C 3 N 4 . The CO 2 adsorption capacity of Cu-BTC@1.8%Cu-g-C 3 N 4 increased by 49.5% compared with that of pure Cu-BTC because of more adsorption sites including unsaturated metal centers and N atoms. Moreover, the Cu-BTC@1.8%Cu-g-C 3 N 4 had good stability in CO 2 adsorption capacity after multiple adsorption cycles. Graphical abstract
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 19
·10051-10063
·
IF 4.4
Nie Chenxin,Yang Jian,Deng Guojun,Feng Yuezhan,Shi Yongqian
A new N–P–Cu containing supermolecular assembly network (MPCSN) was fabricated with titanium carbide (Ti 3 C 2 T x ) nanosheets through intermolecular forces, and then, the flame-retardant thermoplastic polyurethane (TPU) nanocomposites were synthesized by melt blending. The obtained results of the TPU/Ti 3 C 2 T x -MPCSN system indicated that the temperature corresponding to T 5% of TPU nanocomposites by adding 2% Ti 3 C 2 T x or 2% MPCSN decreased to 269.1 and 311.5 °C, respectively. Simultaneously, a well dispersion of the loading of 1.0 mass% Ti 3 C 2 T x -MPCSN was found in TPU matrix. Accordingly, the thermal stability of TPU can be found to be substantially improved in the thermogravimetric analysis, which was embodied in the mass loss of TPU/Ti 3 C 2 T x -MPCSN-1.0 reached up to 8.47 mass%. Moreover, the cone calorimeter tests revealed that the peak of heat release rate, the total heat release, carbon monoxide production rate and total carbon monoxide yield of the TPU nanocomposite were prominently diminished by 16.1%, 37.5%, 18.8% and 37.6%, respectively. This provides clues to the flame-retardant mechanism of TPU nanocomposites: The modified Ti 3 C 2 T x is combined with MPCSN through a cross-linked network grown on the surface of the carbon layer, which not only prevents the leakage of combustible gas, but also catalyzes the formation of the carbon layer. This work demonstrates a novel design for improved Ti 3 C 2 T x with supramolecularly assembled networks to reduce potential fire risk in practical TPU applications, applying to applications in polymer materials.
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Journal of the Australian Ceramic Society
·
2023
·
IF 1.9
Li Shaofei,Huang Ao,Yang Shuang,Gu Huazhi
Owing to the importance of hydrogen metallurgy for the low-carbon and green iron and steel industries, the reduction behavior and microstructure evolution of two iron oxides (hematite and magnetite) at various temperatures were investigated in a pure hydrogen environment (99.999%). The weight loss ratio, total oxygen content, reduction degree, and phase composition of the iron oxides were also discussed. The hematite shows a better reducibility compared to magnetite. It is indicated that hematite and magnetite transform into iron metal with total oxygen contents below 6790 and 25,200 ppm, respectively, when the reduction temperature exceeds 800 °C. Simultaneously, a porous iron skeleton was formed at 800 °C, and the densification of the porous iron occurred with increasing temperature. The impurities in iron oxides significantly affect the microstructure evolution, weight loss ratio, and total oxygen content.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 22
·1-13
·
IF 2.8
Zhang Shangtao,Wang Jian,Wu Rong,Pan Boting,Liu Lang,Liu Chunhai
Transition metal nitrides are potential electrode materials for supercapacitors because of their high specific capacitance, excellent conductivity, high melting point, and chemical stability. Herein, we fabricated zirconium nitride (ZrN) thin films using reactive direct-current (DC) magnetron sputtering at various sputtering power and further investigated their morphologies and electrochemical capacitive performance as an electrode material for supercapacitors. All films, consisting of ZrN and Zr 3 N 4 , are continuous and homogeneous with a fine columnar structure. As the sputtering power increases, the grain size becomes smaller and the content of Zr atoms increases. Electrochemical capacitance performance tests show that the T3 film electrode achieves the highest areal specific capacitance of 1.19 mF cm −2 at a current density of 0.05 mA cm −2 due to higher porosity, better wettability, and lower charge transfer resistance. Cycling tests show that the T3 film achieves an areal specific capacitance of 117% of its initial value and then remains stable, demonstrating the best cycling stability.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-19
·
IF 16.6
Li Yatian,Gao Zhenyue,Wang Yuhong,Pang Bo,Zhang Binbin,Hu Ruxin,Wang Yuqing,Liu Chao,Zhang Xuebin,Yang Jingxuan,Mei Mei,Wang Yongzhi,Zhou Xuan,Li Min,Ren Yu
Temozolomide (TMZ) therapy offers minimal clinical benefits in patients with glioblastoma multiforme (GBM) with high EGFR activity, underscoring the need for effective combination therapy. Here, we show that tonicity-responsive enhancer binding protein (NFAT5) lysine methylation, is a determinant of TMZ response. Mechanistically, EGFR activation induces phosphorylated EZH2 (Ser21) binding and triggers NFAT5 methylation at K668. Methylation prevents NFAT5 cytoplasm interaction with E3 ligase TRAF6, thus blocks NFAT5 lysosomal degradation and cytosol localization restriction, which was mediated by TRAF6 induced K63-linked ubiquitination, resulting in NFAT5 protein stabilization, nuclear accumulation and activation. Methylated NFAT5 leads to the upregulation of MGMT, a transcriptional target of NFAT5, which is responsible for unfavorable TMZ response. Inhibition of NFAT5 K668 methylation improved TMZ efficacy in orthotopic xenografts and patient-derived xenografts (PDX) models. Notably, NFAT5 K668 methylation levels are elevated in TMZ-refractory specimens and confer poor prognosis. Our findings suggest targeting NFAT5 methylation is a promising therapeutic strategy to improve TMZ response in tumors with EGFR activation.
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高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-20
·
IF 10.2
Ai Chen,Sun Xiao,Xiao Shan,Guo Lu,Shang Mengmeng,Shi Dandan,Meng Dong,Zhao Yading,Wang Xiaoxuan,Li Jie
Despite rapid advances in metabolic therapies over the past decade, their efficacy in melanoma has been modest, largely due to the interaction between cancer-associated fibroblasts (CAFs) and cancer cells to promote cancer growth. Altering the tumor microenvironment (TME) is challenging and elusive. CAFs is critical for glutamine deprivation survival in melanoma. In this research, we assembled a CAFs-targeted, controlled-release nanodroplets for the combined delivery of the amino acid transporter ASCT2 (SLC1A5) inhibitor V9302 and GLULsiRNA (siGLUL). The application of ultrasound-targeted microbubble disruption (UTMD) allows for rapid release of V9302 and siGLUL, jointly breaking the glutamine metabolism interaction between CAFs and cancer cells on one hand, on the other hand, blocking activated CAFs and reducing the expression of extracellular matrix (ECM) to facilitate drug penetration. In addition, ultrasound stimulation made siGLUL more accessible to tumor cells and CAFs, downregulating GLUL expression in both cell types. FH-V9302-siGLUL-NDs also serve as contrast-enhanced ultrasound imaging agents for tumor imaging. Our study developed and reported FH-NDs as nanocarriers for V9302 and siGLUL, demonstrating that FH-V9302-siGLUL-NDs have potential bright future applications for integrated diagnostic therapy.
Graphical Abstract
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Communications Biology
·
2023
·Vol. 6
·期 1
·1-12
·
IF 5.9
Wang You-Yuan,Zhen Cheng,Hu Wei,Huang Hui-Huang,Li Yan-Jun,Zhou Ming-Ju,Li Jing,Fu Yu-Long,Zhang Peng,Li Xiao-Yu,Yang Tao,Song Jin-Wen,Fan Xing,Zou Jun,Meng Si-Run,Qin Ya-Qin,Jiao Yan-Mei,Xu Ruonan,Zhang Ji-Yuan,Zhou Chun-Bao,Yuan Jin-Hong,Huang Lei,Shi Ming,Cheng Liang,Wang Fu-Sheng,Zhang Chao
CD8 + T cells are essential for long-lasting HIV-1 control and have been harnessed to develop therapeutic and preventive approaches for people living with HIV-1 (PLWH). HIV-1 infection induces marked metabolic alterations. However, it is unclear whether these changes affect the anti-HIV function of CD8 + T cells. Here, we show that PLWH exhibit higher levels of plasma glutamate than healthy controls. In PLWH, glutamate levels positively correlate with HIV-1 reservoir and negatively correlate with the anti-HIV function of CD8 + T cells. Single-cell metabolic modeling reveals glutamate metabolism is surprisingly robust in virtual memory CD8 + T cells (TVM). We further confirmed that glutamate inhibits TVM cells function via the mTORC1 pathway in vitro. Our findings reveal an association between metabolic plasticity and CD8 + T cell-mediated HIV control, suggesting that glutamate metabolism can be exploited as a therapeutic target for the reversion of anti-HIV CD8 + T cell function in PLWH.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Li Fang,Yue Xiaoyang,Liao Yulong,Qiao Liang,Lv Kangle,Xiang Quanjun
Understanding charge transfer dynamics and carrier separation pathway is challenging due to the lack of appropriate characterization strategies. In this work, a crystalline triazine/heptazine carbon nitride homojunction is selected as a model system to demonstrate the interfacial electron-transfer mechanism. Surface bimetallic cocatalysts are used as sensitive probes during in situ photoemission for tracing the S-scheme transfer of interfacial photogenerated electrons from triazine phase to the heptazine phase. Variation of the sample surface potential under light on/off confirms dynamic S-scheme charge transfer. Further theoretical calculations demonstrate an interesting reversal of interfacial electron-transfer path under light/dark conditions, which also supports the experimental evidence of S-scheme transport. Benefiting from the unique merit of S-scheme electron transfer, homojunction shows significantly enhanced activity for CO 2 photoreduction. Our work thus provides a strategy to probe dynamic electron transfer mechanisms and to design delicate material structures towards efficient CO 2 photoreduction.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-9
·
IF 2.8
He Dan,Zhu Dandan,Zheng Zhen,Wang Xinling
In recently years, polyol prepared from biobased renewable resources has attracted researchers' attention to synthesize green environmental polyurethane. Among numerous polyols, poly (trimethylene ether glycol) (PO3G) is used to prepare polyurethane due to outstanding performances. This paper aims to prepare photosensitive polyurethane acrylate based on 100% renewable PO3G with low viscosity, great flexibility and fast curing speed. The physical and thermal properties of materials were characterized by FTIR, ATR, DSC and DMA. The mechanical properties were measured emphatically. All the results suggest the prepared PO3G-based resins exhibit excellent strength and flexibility with low viscosity. On the other hand, the blocking agent with dynamic covalent bond was introduced to ensure the low viscosity of resins under UV curing. With the break of blocking agent, the isocyanate group could be fully released and carry out chain extension with amine during secondary curing to form polyurethane network and comprehensive performance of resins. Furthermore, the prepared materials have significant advantage and show good application potential in UV-curing 3D printing.
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