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Shasha Dou Shuqing Zhou Hexiu Huang Puxuan Yan Dr. Elvis Shoko Dr. Tayirjan Taylor Isimjan Prof. Dr. Xiulin Yang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(70):16923-16931
Developing a bifunctional catalyst with low cost and high catalytic performance in NaBH4 hydrolysis for H2 generation and selective reduction of nitroaromatics will make a significant impact in the field of sustainable energy and water purification. Herein, a low-loading homogeneously dispersed Pd oxide-rich Co3O4 polyhedral catalyst (PdO-Co3O4) with concave structure is reported by using a metal–organic framework (MOF)-templated synthesis method. The results show that the PdO-Co3O4 catalyst has an exceptional turnover frequency (3325.6 molH2 min−1 molPd−1), low activation energy (43.2 kJ mol−1), and reasonable reusability in catalytic H2 generation from NaBH4 hydrolysis. Moreover, the optimized catalyst also shows excellent catalytic performance in the NaBH4 selective reduction of 4-nitrophenol to 4-aminiphenol with a high first-order reaction rate of approximately 1.31 min−1. These excellent catalytic properties are mainly ascribed to the porous concave structure, monodispersed Pd oxide, as well as the unique synergy between PdO and Co3O4 species, which result in a large specific surface area, high conductivity, and fast solute transport and gas emissions. 相似文献
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Wang Benzhi Huang Hexiu Huang Meilin Yan Puxuan Isimjan Tayirjan Taylor Yang Xiulin 《中国科学:化学(英文版)》2020,63(6):841-849
Hydrogen is one of the most promising energy carriers to replace fossil fuels and electrolyzing water to produce hydrogen is a very effective method. However, designing highly active and stable non-precious metal hydrogen evolution electrocatalysts that can be used in universal pH is a huge challenge. Here, we have reported a simple strategy to develop a highly active and durable non-precious MoO_2-Ni electrocatalyst for hydrogen evolution reaction(HER) in a wide pH range. The MoO_2-Ni catalyst exhibits a superior electrocatalytic performance with low overpotentials of 46, 69, and 84 mV to reach-10 mA cm~(-2) in 1.0 M KOH, 0.5 M H_2SO_4,and 1.0 M PBS electrolytes, respectively. At the same time, the catalyst also shows outstanding stability over a wide pH range. It is particularly noted that the catalytic performance of MoO_2-Ni in alkaline solution is comparable to the highest performing catalysts reported. The outstanding HER performance is mainly attributed to the collective effect of the rational morphological design, electronic structure engineering, and strong interfacial coupling between MoO_2 and Ni in heterojunctions.This work provides a viable method for the synthesis of inexpensive and efficient HER electrocatalysts for the use in wide pH ranges. 相似文献
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本文介绍了创建高水平专门系列演示实验教学基地的做法。该基地极大地丰富了理论教学,为全面提高教学质量起到了应有的作用。 相似文献
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应用质心运动定理一例 总被引:6,自引:0,他引:6
利用质心运动定理方便地求出了沿放在光滑水平面上圆弧槽运动的小球相对惯性参照系的运动轨迹。 相似文献
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Yanting Zheng Zhixin Ling Zhiming Li Puxuan Zhao Xueyu Wen Fengli Qu Haining Yu Hao Chang 《Macromolecular bioscience》2023,23(12):2300253
Dissolvable microneedles (DMNs) are an attractive alternative for vaccine delivery due to their user-friendly, skin-targeted, and minimally invasive features. However, vaccine waste and inaccurate dosage remain significant issues faced by DMNs, as the skin's elasticity makes it difficult to insert MNs completely. Here, a simple and reliable fabrication method are introduced based on two-casting micromolding with centrifugal drying to create a rapidly DMN patch made of hyaluronic acid. Ovalbumin (OVA), as the model antigens, is concentrated in the tip parts of the DMNs (60% of the needle height) to prevent antigen waste caused by skin elasticity. The time and temperature of the initial centrifugal drying significantly affect antigen distribution within the needle tips, with lower temperature facilitating antigen accumulation. The resulting DMN patch is able to penetrate the skin with enough mechanical strength and quickly release antigens into the skin tissue within 3 min. The in vivo study demonstrates that immunization of OVA with DMNs outperforms conventional vaccination routes, including subcutaneous and intramuscular injections, in eliciting both humoral and cellular immunity. This biocompatible DMN patch offers a promising and effective strategy for efficient and safe vaccination. 相似文献
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