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Im, Chae Ho,Kim, Changman,Song, Young Eun,Oh, Sang-Eun,Jeon, Byong-Hun,Kim, Jung Rae Pergamon Press 2018 Chemosphere Vol.191 No.-
<P><B>Abstract</B></P> <P>Conversion of C1 gas feedstock, including carbon monoxide (CO), into useful platform chemicals has attracted considerable interest in industrial biotechnology. Nevertheless, the low conversion yield and/or growth rate of CO-utilizing microbes make it difficult to develop a C1 gas biorefinery process. The Wood-Ljungdahl pathway which utilize CO is a pathway suffered from insufficient electron supply, in which the conversion can be increased further when an additional electron source like carbohydrate or hydrogen is provided. In this study, electrode-based electron transference using a bioelectrochemical system (BES) was examined to compensate for the insufficient reducing equivalent and increase the production of volatile fatty acids. The BES including neutral red (BES-NR), which facilitated electron transfer between bacteria and electrode, was compared with BES without neutral red and open circuit control. The coulombic efficiency based on the current input to the system and the electrons recovered into VFAs, was significantly higher in BES-NR than the control. These results suggest that the carbon electrode provides a platform to regulate the redox balance for improving the bioconversion of CO, and amending the conventional C1 gas fermentation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biological CO conversion in a bioelectrochemical system (BES) was examined. </LI> <LI> Electrode-based electron transference to microbes was enhanced by neutral red (NR). </LI> <LI> BES-based CO conversion produced acetate, butyrate, propionate, and isovalerate. </LI> <LI> VFAs production in BES-NR was significantly higher than the control. </LI> <LI> The coulomb recovery in BES-NR was estimated to be approximately 200%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Im, Mi Eun,Pham-Cong, De,Kim, Ji Yoon,Choi, Hun Seok,Kim, Jae Hyun,Kim, Jong Pil,Kim, Jinwoo,Jeong, Se Young,Cho, Chae Ryong Elsevier 2015 Journal of Power Sources Vol.284 No.-
<P><B>Abstract</B></P> <P>Carbon-coated Fe<SUB>3</SUB>O<SUB>4</SUB> hollow nanofibers (Fe<SUB>3</SUB>O<SUB>4</SUB>/C hNFs) as a lithium ion battery anode material are prepared through electrospinning, annealing, and hydrothermal processing. At a high current density of 1000 mAg<SUP>−1</SUP>, the template-free Fe<SUB>3</SUB>O<SUB>4</SUB>/C hNFs exhibit high 1st- and 150th-cycle specific capacities of ∼963 and 978 mAhg<SUP>−1</SUP>, respectively. Moreover, Fe<SUB>3</SUB>O<SUB>4</SUB>/C hNFs have excellent and stable rate capability, compared to that of the Fe<SUB>3</SUB>O<SUB>4</SUB> hNFs, and a capacity of 704 mAhg<SUP>−1</SUP> at a current density of 2000 mAg<SUP>−1</SUP>. Owing to the carbon layer, the Li-ion diffusion coefficient of the Fe<SUB>3</SUB>O<SUB>4</SUB>/C hNFs, 8.10 × 10<SUP>−14</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP>, is 60 times higher than that (1.33 × 10<SUP>−15</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP>) of the Fe<SUB>3</SUB>O<SUB>4</SUB> hNFs. These results indicate that Fe<SUB>3</SUB>O<SUB>4</SUB>/C hNFs may have important implications for developing high performance anodes for next-generation lithium ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe<SUB>3</SUB>O<SUB>4</SUB> hollow nanofibers are fabricated by electrospinning and annealing process. </LI> <LI> Carbon-coated Fe<SUB>3</SUB>O<SUB>4</SUB> hollow nanofibers are formed by using hydrothermal process. </LI> <LI> Physical and electrochemical properties of the samples are investigated in detail. </LI> <LI> Carbon-coated Fe<SUB>3</SUB>O<SUB>4</SUB> hollow nanofibers are showing better electrochemical performance. </LI> </UL> </P>