The electronic structure of poly(sodium 4-styrenesulfonate) intercalated graphite oxide (PSSGO) in the vicinity of the Fermi level was investigated using ultraviolet photoemission and inverse photoemission spectroscopies. The conduction band density of states for PSSGO is similar to that of graphite, indicating facile electron transfer from electrolyte ions to the PSSGO electrode in energy storage device applications. The in situ band gap of 1.9 eV observed was smaller than that of graphite oxide by 0.4 eV, helping to explain the high performance of electric double layer capacitor of PSSGO compared with graphite oxide. (C) 2013 Elsevier B. V. All rights reserved.
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Daegu Univ, Dept Phys, Inst Basic Sci, Gyongsan 712714, South KoreaDaegu Univ, Dept Phys, Inst Basic Sci, Gyongsan 712714, South Korea
Ghanashyam, Gyawali
Jeong, Hae Kyung
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Daegu Univ, Dept Phys, Inst Basic Sci, Gyongsan 712714, South Korea
Daegu Univ, Dept Mat Energy Sci & Engn, Inst Ind & Tech, Gyongsan 712714, South KoreaDaegu Univ, Dept Phys, Inst Basic Sci, Gyongsan 712714, South Korea
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Pusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Yu, Hyun-Woo
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Kim, Hyoung Kyu
Kim, Taewoo
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Seoul Natl Univ, Sch Mech & Aerosp Engn, Seoul 151742, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Kim, Taewoo
Bae, Kyoung Min
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Pusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Bae, Kyoung Min
Seo, Sung Min
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Samsung Elect, DRAM Design Team, Memory Div, Hwasung City, Gyeonggi Do, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Seo, Sung Min
Kim, Jong-Man
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Pusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Pusan Natl Univ, Dept Nanomechatron Engn, Pusan 609735, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Kim, Jong-Man
Kang, Tae June
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Pusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Pusan Natl Univ, Dept Nanomechatron Engn, Pusan 609735, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea
Kang, Tae June
Kim, Yong Hyup
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Seoul Natl Univ, Sch Mech & Aerosp Engn, Seoul 151742, South KoreaPusan Natl Univ, Dept Nanofus Technol, Pusan 609735, South Korea