Self-supported ZIF-coated Co2P/V3P bifunctional electrocatalyst for high-efficiency water splitting

Yuying Yang,Jingyue Yang,Qin Zhou,Dalan Qian,Yaling Xiong,Zhongai Hu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-

Exploring high-efficiency dual-functional electrocatalysts to drive electrochemical water splitting is ofgreat importance for advancement of renewable hydrogen energy. Herein, a hierarchical core–shell structureelectrocatalyst ZIF-Co2P/V3P is in situ grown on Ni foam (abbreviated as ZIF-Co2P/V3P@NF) by a stepwisemethod. Firstly, Co, V layered double hydroxides (CoV-LDHs) is grown directly on Ni foam (NF)substrate by solvothermal method. Secondly, CoV-LDHs@NF is transferred into 2-MeIm solution andits surface is coated with a layer of imidazolate zeolite skeleton (ZIF). Finally, ZIF-Co2P/V3P@NF catalystis obtained by low-temperature phosphorization method. The performance of hydrogen evolution reaction(HER) and oxygen evolution reaction (OER) can be adjusted by tuning molar ratio of Co/V, and theoptimized ZIF-Co2P/V3P@NF-2 manifests superior performance due to its core–shell structure coveredby ZIF skeleton, rich heterogeneous interfaces, as well as the positive synergistic interaction betweenthe Co2P and V3P. The overpotentials are only 57 mV@10 mA cm2 for HER and 261 mV@10 mA cm2for OER. Remarkably, the alkaline electrolyzer assembled with ZIF-Co2P/V3P@NF-2 catalyst acquires asmall operating voltage of 1.54 V to drive the current density of 10 mA cm2 and displays excellentlong-term durability. This work provides a novel opinion for design and preparation of non-noble metalelectrocatalysts.

Synthesis of Nanoporous Materials Al-MCM-41 from Natural Halloysite

Yaling Xie,Aidong Tang,HUAMING YANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1

Nanoporous materials Al-MCM-41 with varying Si/Al molar ratios have been successfully synthesized from natural clay mineral halloysite nanotubes (HNTs). Hydrothermal treatment of acid-pretreated HNTs and NaOH solution resulted in the one-step synthesis of final nanoporous products by using surfactant. The effects of Si/Al molar ratios (7.7, 61.0 and 176.5) on the surface area, porosity and degree of structural order of Al-MCM-41 materials have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption–desorption measurements and Fourier transform infrared (FTIR) spectra techniques. The results indicated that Si/Al molar ratio had important effect on the characteristics of nanoporous materials, and Al-MCM-41 with an intermediate Si/Al molar ratio of 61.0 exhibited excellent characteristics with high degree of order, high surface area (SBET) of 1033 m2 /g and pore volume of 0.92 mL/g.

Hydrogen sulfide ameliorates abdominal aorta coarctation-induced myocardial fibrosis by inhibiting pyroptosis through regulating eukaryotic translation initiation factor 2α phosphorylation and activating PI3K/AKT1 pathway

Yaling Li,Zhixiong Wu,Jiangping Hu,Gongli Liu,Hongming Hu,Fan Ouyang,Jun Yang The Korean Society of Pharmacology 2023 The Korean Journal of Physiology & Pharmacology Vol.27 No.4

This study aimed to assess the effects of exogenous hydrogen sulfide (H₂S) on abdominal aorta coarctation (AAC) induced myocardial fibrosis (MF) and autophagy in rats. Forty-four Sprague-Dawley rats were randomly divided into control group, AAC group, AAC + H₂S group, and H₂S control group. After a model of rats with AAC was built surgically, AAC + H₂S group and H₂S group were injected intraperitoneally with H₂S (100 µmol/kg) daily. The rats in the control group and the AAC group were injected with the same amount of PBS. We observed that H₂S can improve left ventricular function and the deposition of myocardial collagen fibers, inhibit pyroptosis, down-regulate the expression of P-eif2α in myocardial tissue, and inhibit cell autophagy by activating the phosphatidylinositol 3-kinase (PI3K)/AKT1 signaling pathway (p < 0.05). In addition, angiotensin II (1 µM) H9c2 cardiomyocytes were injured in vitro experiments, and it was also observed that pyroptosis was inhibited after H₂S (400 µmol/kg) intervention, the expression of P-eif2α in cardiomyocytes was significantly down-regulated, and the PI3K/AKT1 signaling pathway was activated at the same time. Therefore, increasing the expression of P-eif2α reverses the activation of the PI3K/AKT1 signaling pathway by H₂S. In conclusion, these findings suggest that exogenous H₂S can ameliorate MF in rats with AAC by inhibiting pyroptosis, and the mechanism may be associated with inhibiting the phosphorylation of eif2α and activating the PI3K/AKT1 signaling pathway to inhibit excessive cell autophagy.

Facile and Effective Preparation of the Lotus Leaf-based Adsorbent by Exposing Cellulose Nanocrystal for Waste Water Treatment and Air Purification

Huiyu Yang,Ke Liu,Xin Liu,Yaling Wang,Keshuai Liu,Fengxiang Chen,Bo Deng,Weilin Xu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2

One substantial plant waste, lotus leave was fabricated into lotus leave powder with different diameters by ball milling. The surface morphology, chemical composition, particle size, porosity parameters, crystal structure, and wettabilityof lotus leaf powders (LLPs) were analyzed by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), Fourier-transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), laser particle size analysis, N2 adsorption/desorption, X-ray diffraction (XRD) analysis, and water contact angle (WCA) analysis, respectively. The results showed that the micro- and nanoscale waxy papilla structures on the surface of the lotus leaf were gradually destroyed by mechanical forces along with extended balling time. Accompanied re-exposing of -OH affluent cellulose nanocrystals (CNCs) was proved by HR-TEM, XRD, and FTIR. FTIR also revealed a hydroxyl to carboxyl transition on the surface of CNCs. Both the re-exposure of CNCs and thereof chemical structure transition after ball millingmade the LLP a good candidate for pollutant adsorbent for dye, formaldehyde, and heavy metal ions.

Define of Optimal Addition Period of Osteogenic Peptide to Accelerate the Osteogenic Differentiation of Human Pluripotent Stem Cells

Song Yameng,Li Hongjiao,Wang Zixuan,Shi Jiamin,Li Jing,Wang Lu,Liao Lingzi,Ma Shengqin,Zhang Yun,Liu Bin,Yang Yaling,Zhou Ping 한국조직공학과 재생의학회 2024 조직공학과 재생의학 Vol.21 No.2

Background: The addition of growth factiors is commonly applied to improve the osteogenic differentiation of stem cells. However, for human pluripotent stem cells (hPSCs), their complex differentiation processes result in the unknown effect at different stages. In this study, we focused on the widely used bone forming peptide-1 (BFP-1) and investigated the effect and mechanisms of its addition on the osteogenic induction of hPSCs as a function of the supplementation period. Methods: Monolayer-cultured hPSCs were cultured in osteogenic induction medium for 28 days, and the effect of BFP-1 peptide addition at varying weeks was examined. After differentiation for varying days (0, 7, 14, 21 and 28), the differentiation efficiency was determined by RT–PCR, flow cytometry, immunofluorescence, and alizarin red staining assays. Moreover, the expression of marker genes related to germ layers and epithelial-mesenchymal transition (EMT) was investigated at day 7. Results: Peptide treatment during the first week promoted the generation of mesoderm cells and mesenchymal-like cells from hiPSCs. Then, the upregulated expression of osteogenesis marker genes/proteins was detected in both hESCs and hiPSCs during subsequent inductions with BFP-1 peptide treatment. Fortunately, further experimental design confirmed that treating the BFP-1 peptide during 7–21 days showed even better performance for hESCs but was ineffective for hiPSCs. Conclusion: The differentiation efficiency of cells could be improved by determining the optimal treatment period. Our study has great value in maximizing the differentiation of hPSCs by adding osteogenesis peptides based on the revealed mechanisms and promoting the application of hPSCs in bone tissue regeneration. Background: The addition of growth factiors is commonly applied to improve the osteogenic differentiation of stem cells. However, for human pluripotent stem cells (hPSCs), their complex differentiation processes result in the unknown effect at different stages. In this study, we focused on the widely used bone forming peptide-1 (BFP-1) and investigated the effect and mechanisms of its addition on the osteogenic induction of hPSCs as a function of the supplementation period. Methods: Monolayer-cultured hPSCs were cultured in osteogenic induction medium for 28 days, and the effect of BFP-1 peptide addition at varying weeks was examined. After differentiation for varying days (0, 7, 14, 21 and 28), the differentiation efficiency was determined by RT–PCR, flow cytometry, immunofluorescence, and alizarin red staining assays. Moreover, the expression of marker genes related to germ layers and epithelial-mesenchymal transition (EMT) was investigated at day 7. Results: Peptide treatment during the first week promoted the generation of mesoderm cells and mesenchymal-like cells from hiPSCs. Then, the upregulated expression of osteogenesis marker genes/proteins was detected in both hESCs and hiPSCs during subsequent inductions with BFP-1 peptide treatment. Fortunately, further experimental design confirmed that treating the BFP-1 peptide during 7–21 days showed even better performance for hESCs but was ineffective for hiPSCs. Conclusion: The differentiation efficiency of cells could be improved by determining the optimal treatment period. Our study has great value in maximizing the differentiation of hPSCs by adding osteogenesis peptides based on the revealed mechanisms and promoting the application of hPSCs in bone tissue regeneration.