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1,085 results on '"Zhang, Zhujun"'

158. Binary dopant segregation enables hematite-based heterostructures for highly efficient solar H2O2 synthesis.

Author

Zhang, Zhujun, Tsuchimochi, Takashi, Ina, Toshiaki, Kumabe, Yoshitaka, Muto, Shunsuke, Ohara, Koji, Yamada, Hiroki, Ten-no, Seiichiro L., and Tachikawa, Takashi

Subjects
HEMATITE, HETEROSTRUCTURES, DOPING agents (Chemistry), CRYSTAL grain boundaries, OXIDATION of water, ANNEALING of metals, CHEMICAL synthesis
Abstract

Dopant segregation, frequently observed in ionic oxides, is useful for engineering materials and devices. However, due to the poor driving force for ion migration and/or the presence of substantial grain boundaries, dopants are mostly confined within a nanoscale region. Herein, we demonstrate that core–shell heterostructures are formed by oriented self-segregation using one-step thermal annealing of metal-doped hematite mesocrystals at relatively low temperatures in air. The sintering of highly ordered interfaces between the nanocrystal subunits inside the mesocrystal eliminates grain boundaries, leaving numerous oxygen vacancies in the bulk. This results in the efficient segregation of dopants (~90%) on the external surface, which forms their oxide overlayers. The optimized photoanode based on hematite mesocrystals with oxide overlayers containing Sn and Ti dopants realises high activity (~0.8 μmol min−1 cm−2) and selectivity (~90%) for photoelectrochemical H2O2 production, which provides a wide range of application for the proposed concept. Photoelectrochemical H2O2 production offers a renewable means for chemical synthesis, yet water oxidation to H2O2 remains a challenge. Here, authors prepare heterostructured, metal-doped hematite mesocrystals that show a high selectivity for photoelectrochemical H2O2 alongside H2 production. [ABSTRACT FROM AUTHOR]

Published
2022
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174. Heme Oxygenase 1 Inhibits Adult Neural Stem Cells Proliferation and Survival via Modulation of Wnt/β-Catenin Signaling

Author

Si, Zizhen, primary, Wang, Xue, additional, Kang, Yuchun, additional, Wang, Xidi, additional, Sun, Changhui, additional, Li, Yuanxin, additional, Xu, Jiakun, additional, Wu, Jiajia, additional, Zhang, Zhujun, additional, Li, Ling, additional, Peng, Yahui, additional, Li, Jihong, additional, Sun, Chongran, additional, Hui, Yang, additional, and Gao, Xu, additional

Published
2020
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180. Legumain-deficient macrophages promote senescence of tumor cells by sustaining JAK1/STAT1 activation

Author

Shen, Long, primary, Kang, Lichun, additional, Wang, Dekun, additional, Xun, Jing, additional, Chen, Chuan'ai, additional, Du, Lingfang, additional, Zhang, Mianzhi, additional, Gong, Junbo, additional, Mi, Xue, additional, Yue, Shijing, additional, Zhang, Yuying, additional, Song, Xiangrong, additional, Xiang, Rong, additional, Zhang, Zhujun, additional, and Tan, Xiaoyue, additional

Published
2020
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182. Mathematical modeling and comparative analysis of the Ebola epidemic reveal effective control measures

Author

Author), Luosheng Wen(Former Corresponding, primary, Li, Junlong, additional, Song, Caiping, additional, Yang, Jingya, additional, Zheng, Jingmin, additional, Zhou, Lina, additional, Zhang, Zhujun, additional, Pu, Jie, additional, Luo, Yang, additional, Zhang, Hongyan, additional, Wang, Yungui, additional, and Author), Hao Wu(New Corresponding, additional

Published
2020
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198. Chemiluminescence flow-through sensor for copper based on an anodic stripping voltammetric flow cell and an ion-exchange column with immobilized reagents

Author

Qin, Wei, Zhang, Zhujun, and Liu, Huajun

Subjects
Chemiluminescence -- Analysis, Biosensors -- Usage, Copper -- Analysis, Ion exchange -- Analysis, Immobilized enzymes -- Analysis, Chemical tests and reagents -- Analysis, Chemistry
Abstract

A novel chemiluminescence (CL) flow-through sensor based on immobilizing all the ingredients involved in the analytical reaction for the determination of copper is proposed. The analytical reagents including luminol and cyanide were coimmobilized permanently on an anion-exchange column, while the analyte copper was retained temporarily by electrochemical preconcentration on a gold electrode placed in an anodic stripping voltammetric flow cell. By injection of a volume of sodium hydroxide through the column with immobilized reagents, luminol and cyanide were eluted from the resins in alkaline aqueous solution and then reacted with copper stripped from the gold electrode to produce a CL signal, by means of which copper could be sensed. The sensor was not susceptible to interference by other metal ions associated with the CL reaction. The response to the concentration of copper was linear in the range of 0.01-10 [[micro]gram]/L and an extremely low detection limit of 8.0 x [10.sup.-3][[micro]gram]/L was achieved. A complete analysis could be performed in 4 min with a relative standard deviation of less than 8%. The column with immobilized reagents was readily prepared and could be reused over 200 times. The sensor was applied successfully to the determination of copper in human serum and natural water samples.

Published
1998

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