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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.
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Lina Ma,Yun Li,Ming Feng,Yuying Qian,Wei Yang,Jia Liu,Rui Han,Hong Zhu 연세대학교의과대학 2015 Yonsei medical journal Vol.56 No.1
Purpose: Insulin resistance plays a role in the development of dementia and hypertension. We investigated a possible relationship between cognitive impairment and insulin resistance in elderly Chinese patients with primary hypertension. Materialsand Methods: One hundred and thirty-two hypertensive elderly patients (>60 years) were enrolled in this study, and assigned into either the cognitive impairmentgroup (n=61) or the normal cognitive group (n=71). Gender, age, education,body mass index (BMI), waist hip ratio (WHR), total cholesterol (TC), triglyceride(TG), C-reactive protein (CRP), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C), creatinine (Cr), fasting plasma glucose (FPG), fasting insulin (FINS), homeostasis model of assessment for insulin resistance index (HOMA-IR), systolic blood pressure, diastolic blood pressure, smoking history, atherosclerosis and the proportion of uncontrolled hypertensionwere compared between the two groups. Multi-factorial logistic regressionanalysis was performed. Results: No significant differences were found in gender, age, TC, CRP, HDL-C, LDL-C, Cr, BP, smoking history, atherosclerosis and the proportion of uncontrolled hypertension between the two groups. The cognitiveimpairment group had lower education levels, and higher BMI, WHR, TG, FPG, FINS, and HOMA-IR levels than the control group. Logistic regression analysis revealed the levels of education, BMI, WHR, and HOMA-IR as independentfactors that predict cognitive impairment in patients. Conclusion: Our study demonstrates that poor education and increased BMI, WHR, and HOMA-IR are independent risk factors for cognitive impairment in elderly patients with hypertension. Insulin resistance plays an important role in the development of cognitive impairment in primary elderly hypertensive patients.
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