polymers have also emerged as potential candidates for organic thermoelectrics, [7,8] potentially delivering flexible, large-area, and low-cost energy generation or heatingcooling devices for appealing applications, e.g., wearable energy harvesting, that are currently not possible for traditional brittle and usually either toxic or rare inorganic crystalline thermoelectric materials. Thermoelectric materials are evaluated by the dimensionless figure of merit ZT = S 2 σT/κ, where S, σ, T and κ represent the Seebeck coefficient, electrical conductivity, absolute temperature and thermal conductivity, respectively. Most conjugated polymers are characterized with low κ values, intrinsically contributing to a high ZT. This point has been verified by recent extensive thermoelectric studies based on p-type conjugated polymers such as poly(3,4-ethylenedioxythiophene) (PEDOT) with ZT > 0.25. [9,10] The performance of p-type and n-type thermoelectric materials should pair with each other ahead of any practical applications. However, n-type conjugated polymer-based thermoelectric devices are still far inferior to their p-type counterparts in terms of power factor (S 2 σ). [11,12] Therefore, the development of efficient The ORCID identification number(s) for the author(s) of this article can be found under
The
influence of different support surfaces and physical structures
on cobalt species and catalytic Fischer–Tropsch synthesis (FTS)
performance has been investigated by using silica or mesoporous carbon
as support. All the three catalysts Co/SBA-15, Co/SiO2,
and Co/CMK-3 behaved differently in the FTS test and showed characteristic
cobalt species. After calcination in argon, Co3O4 was prominent on both Co/SBA-15 and Co/SiO2 because of
the stronger metal–support interaction. However, the weaker
metal–support interaction on Co/CMK-3 coupled with the autoreduction
of cobalt oxide facilitated the formation of more CoO on the support
surface. On account of the higher reducibility and specific surface
area, Co/SBA-15 exhibited higher CO conversion in FTS than another
two as-synthesized catalysts. SBA-15 and CMK-3 possess well-ordered
channel structure which favors mass transport and diffusion while
diffusion inhibits hydrocarbon chain growth. The highest C5+ and C11–17 selectivities were observed over Co/SiO2 without regular channels, enabling enough intermediate residence
time for carbon chain growth.
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