https://pubs.kist.re.kr/handle/123456789/75373 Wed, 15 Apr 2026 17:36:40 GMT 2026-04-15T17:36:40Z https://pubs.kist.re.kr/handle/201004/120557 Title: Sintering and electrical behavior of ZrP2O7-CeP2O7 solid solutions Zr1-xCexP2O7; x=0-0.2 and (Zr0.92Y0.08)(1-y)CeyP2O7; y=0-0.1 for application as electrolyte in intermediate temperature fuel cells Authors: Gautam, Sandeep K.; Singh, Akanksha; Mathur, Lakshya; Devi, Nitika; Singh, Rajesh K.; Song, Sun-Ju; Henkensmeier, Dirk; Singh, Bhupendra Abstract: ZrP2O7-CeP2O7 solid solutions, Zr1-xCexP2O7; x=0-0.2 and (Zr0.92Y0.08)(1-y)CeyP2O7; y=0-0.1, were prepared by partially replacing Zr4+ with Ce4+ and its effect on the phase composition, sintering behavior, microstructure, and ionic conductivity is analyzed. Ce4+-doped specimens showed improved sintering behavior due to the partial reduction of Ce4+ to Ce3+, as confirmed by X-ray photoelectron spectroscopy (XPS). In unhumidified atmosphere, the electrical conductivity of Zr1-xCexP2O7 increased with increasing cerium content, which can be attributed to the increase in densification and formation of oxygen vacancies due to the partial reduction of Ce4+ to Ce3+. For (Zr0.92Y0.08)(1-y)CeyP2O7; y=0-0.1 specimens, the electrical conductivity increased 4 orders of magnitude during humidification in air (pH2O=0.12atm). At 80 degrees C, specimen (Zr0.92Y0.08)(0.9)Ce0.1P2O7 (ZYCP10) showed a maximum of 1.72x10(-2)Scm(-1) which decreased sharply at 100 degrees C. Furthermore, Zr0.92Y0.08P2O7 (ZYP), (Zr0.92Y0.08)(0.95)Ce0.05P2O7 (ZYCP5), and ZYCP10 specimens humidified at 160 degrees C showed the maximum conductivity of 1.04x10(-3), 1.32x10(-3), and 8.09x10(-3) Scm(-1), respectively, at 190 degrees C. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/120557 2019-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/120556 Title: alpha-Fe2O3 anchored on porous N doped carbon derived from green microalgae via spray pyrolysis as anode materials for lithium ion batteries Authors: Kwon, Ki Min; Kim, In Gyeom; Lee, Kwan-Young; Kim, Hansung; Kim, Mun Sek; Cho, Won Il; Choi, Jaeyoung; Nah, In Wook Abstract: The alpha-Fe2O3@nitrogen doped carbon (as donated alpha-Fe2O3@NC) composites derived from green microalgae was synthesized using one-pot spray pyrolysis, which showed a high discharge capacity of 1281.5 mAh g(-1) at 100 rnAg(-1) as anode materials for lithium ion storage. They also provided good rate performance in a range of 200 mA g(-1)-1000 mAg(-1), and maintained a capacity of 92% after 100 cycles at 200 mAg(-1). It demonstrated not only improved electrical conductivity but also effective prevention of the volume expansion of iron oxide during battery charge/discharge by uniformly forming iron oxide nanoparticles on microalgae via spray pyrolysis. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/120556 2019-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/120555 Title: A High-Capacity, Reversible Liquid Organic Hydrogen Carrier: H-2-Release Properties and an Application to a Fuel Cell Authors: Jang, Munjeong; Jo, Young Suk; Lee, Won Jong; Shin, Byeong Soo; Sohn, Hyuntae; Jeong, Hyangsoo; Jang, Seong Cheol; Kwak, Sang Kyu; Kang, Jeong Won; Yoon, Chang Won Abstract: Hydrogen storage in the form of a liquid chemical is an important issue that can bridge the gap between sustainable hydrogen production and utilization with a fuel cell, which is one of the essential sectors in the hydrogen economy. Herein, the application of a potential liquid organic hydrogen carrier, consisting of biphenyl and diphenylmethane, is demonstrated as a safe and economical hydrogen storage material. The presented material is capable of a reversible storage and release of molecular hydrogen with 6.9 wt % and 60 g-H-2 L-1 of gravimetric and volumetric hydrogen storage capacities, respectively, presenting superior properties as a hydrogen carrier. Equilibrium conversion and the required enthalpies of dehydrogenation are calculated using a density functional theory. Experimentally, dehydrogenation conversion of greater than 99% is achieved, producing molecular hydrogen with greater than 99.9% purity, with negligible side reactions; this is further confirmed by nuclear magnetic resonance spectroscopy. Less than 1% of the material is lost after cyclic tests of hydrogenation and dehydrogenation were conducted consecutively nine times. Finally, a dehydrogenation system is designed and operated in conjunction with a polymer electrolyte membrane fuel cell that can generate greater than 0.5 kW of electrical power in a continuous manner, proving its capability as a promising liquid organic hydrogen carrier. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/120555 2019-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/120554 Title: Production of phenolic hydrocarbons from organosolv lignin and lignocellulose feedstocks of hardwood, softwood, grass and agricultural waste Authors: Son, Deokwon; Gu, Sangseo; Choi, Jae-Wook; Suh, Dong Jin; Jae, Jungho; Choi, Jungkyu; Ha, Jeong-Myeong Abstract: Organosolv lignin extracted from the four representative lignocellulose feeds of oil palm empty fruit bunch (agricultural waste), oak (hardwood), pine (softwood) and Miscanthus giganteus (grass) is depolymerized using Ru/H-zeolite beta to produce phenolic hydrocarbons. The bulky methoxy functionality, which is rich in oak and pine, sterically hindered the ether bonds, decreasing the yields of phenolic monomers and improving the beta-beta coupling to repolymerize lignin fragments. Both depolymerization and repolymerization are improved at a higher reaction temperature. The structures and the reaction behavior of organosolv lignin are observed using NMR, GPC, N-2-physisorption, SEM and DLS analysis methods. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/120554 2019-01-01T00:00:00Z