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Changsha, China

Fu X.,Wuhan University of Technology | Chen D.,Wuhan University of Technology | Wang M.,Wuhan University of Technology | Yang Y.,Wuhan University of Technology | And 4 more authors.
Electrochimica Acta

Ternary transition metal oxides are the important alternatives to commercial graphite for future lithium-ion batteries (LIBs). In this work, porous Co2FeO4 octahedral structures were synthesized by annealing the precursor from hydrothermal process, and the electrochemical properties of the samples as anode for LIBs were studied. Electrochemical measurements demonstrate that porous Co2FeO4 structures with octahedral shape display remarkably high discharge capacity, which is even slightly higher than the theoretical value of Co2FeO4. The specific capacity retention of Co2FeO4 porous structure annealed at 700 C reaches ca. 96.4% of that in the first cycle after 50 cycles. It is expected that the as-synthesized porous Co2FeO4 octahedrons can be a promising anode material for LIBs. © 2013 Elsevier Ltd. Source

Zhang X.,HunanUniversity | Zhang X.,HunanUniversity | Li Z.,HunanUniversity | Li Z.,HunanUniversity | And 10 more authors.

Water erosion processes can significantly affect the delivery and distribution patterns of soil organic carbon (SOC) within the landscape. While many studies focus on the erosion processes and runoff transport of SOC, little attention has been paid to the on-site redistribution and vertical transport of SOC. This study characterizes SOC erosion dynamics, including infiltration-associated movement, and discusses the effects of rainfall intensity and slope position on SOC transport within the hilly red soil region of southern China. The results show that SOC loss was likely due to sediment transport rather than runoff. The eroded SOC was not significantly enriched, which may be due to the soil properties and the type of rainfall event. The initial SOC concentration affected the enrichment ratio of eroded SOC in the sediment. On-site horizontal redistribution occurred regardless of rainfall intensity, whereas the SOC transport trends varied with rainfall intensity and slope positions. This demonstrates that soil preservation could reduce SOC loss, and thus influence the global carbon cycle. © 2013 Elsevier B.V. Source

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