Index Catalog // ScholarsArchive@OSU

Creator:: Wang, Xingfeng
Abstract:: Electrochemical capacitors and batteries are two major electrochemical energy storage technologies, which have been investigated extensively to meet the rapidly-growing demand for higher energy, higher power, lower cost and enhanced safety in the past few decades. With the charge storage mechanism of electrostatic charge adsorption desorption via electrical double layers,...
Resource Type:: Dissertation

Creator:: Xing, Zhenyu, Wang, Bao, Gao, Wenyang, Pan, Changqing, Halsted, Joshua K., Chong, Elliot S., Lu, Jun, Wang, Xingfeng, Luo, Wei, Chang, Chih-Hung, Wen, Youhai, Ma, Shengqian, Amine, Khalil, and Ji, Xiulei
Abstract:: Converting CO2 to valuable materials is attractive.Herein, we report using simple metallothermic reactions to reduce atmospheric CO2 to dense nanoporous graphene. By using a Zn/Mg mixture as a reductant, the resulted nanoporous graphene exhibits highly desirable properties: high specific surface area of 1900 m2/g, a great conductivity of 1050 S/m...
Resource Type:: Article

Creator:: Chun, Sang-Eun, Evanko, Brian, Wang, Xingfeng, Vonlanthen, David, Ji, Xiulei, Stucky, Galen D., and Boettcher, Shannon W.
Abstract:: Electrochemical double-layer capacitors exhibit high power and long cycle life but have low specific energy compared with batteries, limiting applications. Redox-enhanced capacitors increase specific energy by using redox-active electrolytes that are oxidized at the positive electrode and reduced at the negative electrode during charging. Here we report characteristics of several...
Resource Type:: Article

Creator:: Raju, Vadivukarasi, Rains, Jordan, Gates, Cooper, Luo, Wei, Wang, Xingfeng, Stickle, William F., Stucky, Galen D., and Ji, Xiulei
Abstract:: We, for the first time, demonstrate that orthorhombic V₂O₅ can exhibit superior electrochemical performance in sodium ion batteries when uniformly coated inside nanoporous carbon. The encapsulated V₂O₅ shows a specific capacity as high as 276 mAh/g, while the whole nanocomposite exhibits a capacity of 170 mAh/g. The V₂O₅/C composite was...
Resource Type:: Article

Creator:: Raju, Vadivukarasi, Wang, Xingfeng, Luo, Wei, and Ji, Xiulei
Abstract:: We introduce a novel ambient hydrolysis deposition (AHD) methodology that, for the first time, employs sequential water adsorption followed by a hydrolysis reaction to infiltrate tiny SnO2₂ particles inside nanopores of mesoporous carbon in a conformal and controllable manner. The empty space in the SnO2₂/C composites can be adjusted by...
Resource Type:: Article

Creator:: Wang, Xingfeng, Raju, Vadivukarasi, Luo, Wei, Wang, Bao, Stickle, William F., and Ji, Xiulei
Abstract:: Despite the considerable advances of deposition technologies, it remains a significant challenge to form conformal deposition on surface of nanoporous carbons. Here, we introduce a new ambient hydrolysis deposition method that employs and controls pre-adsorbed water vapor on nanoporous carbons to define the deposition of TiO₂. We converted the deposited...
Resource Type:: Article

Creator:: Luo, Wei, Wang, Bao, Wang, Xingfeng, Stickle, William F., and Ji, Xiulei
Abstract:: We, for the first time, employ magnesiothermic reaction to convert microwave-irradiated graphite oxide to pure graphene. The magnesiothermic reaction raises the carbon to oxygen atomic ratio from 22.2 to 165.7 and maintains a high surface area. The new strategy demonstrates an efficient method for obtaining highly pure graphene materials.
Resource Type:: Article

Creator:: Luo, Wei, Wang, Xingfeng, Meyers, Colin, Wannenmacher, Nick, Sirisaksoontorn, Weekit, Lerner, Michael M., and Ji, Xiulei
Abstract:: Magnesiothermic reduction can directly convert SiO₂ into Si nanostructures. Despite intense efforts, efficient fabrication of highly nanoporous silicon by Mg still remains a significant challenge due to the exothermic reaction nature. By employing table salt (NaCl) as a heat scavenger for the magnesiothermic reduction, we demonstrate an effective route to...
Resource Type:: Article

ScholarsArchive@OSU