Effect of KOH on the continuous synthesis of cobalt oxide and manganese oxide nanoparticles in supercritical water

Agung Nugroho; Jaehoon Kim

Journal of Industrial and Engineering Chemistry, Vol.20, No.6, 4443-4446, November, 2014

DOI10.1016/j.jiec.2014.02.014 Export Citation

Effect of KOH on the continuous synthesis of cobalt oxide and manganese oxide nanoparticles in supercritical water

Agung Nugroho¹, and Jaehoon Kim^{2, 3, †}

¹Clean Energy Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
²School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeong Gi-Do 440-746, Republic of Korea
³SKKU Advanced Institute of Nano Technology (SAINT), 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeong Gi-Do 440-746, Republic of Korea

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The effects of KOH on the supercritical hydrothermal synthesis of cobalt oxide and manganese oxide particles are investigated using a continuous-flow reactor. Significant changes in morphology, particle size, and oxidation state are observed by adding KOH. The spinel Co3O4 phase is transformed to a rocksalt CoO phase and the pyrolusite MnO2 phase is transformed to a hausmannite Mn3O4 phase in the presence of 0.5 M KOH. The average particle size of the metal oxides decreased with an addition of KOH. The OH- ions of KOHmay act as a reducing agent as well as a supersaturation enhancing agent under supercritical water conditions.

Keywords:Cobalt oxide;Manganese oxide;Oxidation state;Supercritical hydrothermal synthesis;Nanoparticles

[References]

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[Referenced By]

[1] Jiao F, Frei H, Energy Environ. Sci., 3, 1018 (2010)

[2] Maltha A, Favre TL, Kist HF, Zuur AP, Ponec V, J. Catal., 149(2), 364 (1994)

[3] Xie X, Li Y, Liu ZQ, Haruta M, Shen W, Nature, 458, 746 (2009)

[4] Li WY, Xu LN, Chen J, Adv. Funct. Mater., 15(5), 851 (2005)

[5] Ando M, Kobayashi T, Iijima S, Haruta M, J. Mater. Chem., 7, 1779 (1997)

[6] Poizot P, Laruelle S, Grugeon S, Dupont L, Tarascon JM, Nature, 407, 496 (2000)

[7] Cabana J, Monconduit L, Larcher D, Palacin MR, Adv. Mater., 22(35), E170 (2010)

[8] Liu C, Li F, Ma LP, Cheng HM, Adv. Mater., 22(8), E28 (2010)

[9] Lu XH, Lei J, Zhou D, Fang SY, Dong YL, Xia QH, Indian J. Chem. Sect A-Inorg. Bio-Inorg. Phys. Theor. Anal. Chem., 49, 1586 (2010)

[10] Te M, Foley HC, Appl. Catal. A: Gen., 119(1), 97 (1994)

[11] Adschiri T, Kanazawa K, Arai K, J. Am. Ceram. Soc., 75, 1019 (1992)

[12] Byrappa K, Adschiri T, Prog. Cryst. Growth Charact. Mater., 53, 117 (2007)

[13] Hong SA, Kim SJ, Kim J, Chung KY, Cho BW, Kang JW, J. Supercrit. Fluids, 55(3), 1027 (2011)

[14] Shin YH, Koo SM, Kim DS, Lee YH, Veriansyah B, Kim J, Lee YW, J. Supercrit. Fluids, 50(3), 250 (2009)

[15] Adschiri T, Lee YW, Goto M, Takami S, Green Chem., 13, 1380 (2011)

[16] Jeon HS, Nugroho A, Kim J, Kim H, Min BK, Int. J. Hydrog. Energy, 36(17), 10587 (2011)

[17] Nugroho A, Kim SJ, Chung KY, Cho BW, Lee YW, Kim J, Electrochem. Commun., 13, 650 (2011)

[18] Nugroho A, Kim SJ, Chung KY, Kim J, Electrochim. Acta, 78, 623 (2012)

[19] Becker J, Hald P, Bremholm M, Pedersen JS, Chevallier J, Iversen SB, Iversen BB, ACS Nano, 2, 1058 (2008)

[20] Sue K, Kawasaki S, Suzuki M, Hakuta Y, Hayashi H, Arai K, Takebayashi Y, Yoda S, Furuya T, Chem. Eng. J., 166(3), 947 (2011)

[21] Galkin AA, Kostyuk BG, Lunin VV, Poliakoff M, Angew. Chem.-Int. Edit., 39, 2738 (2000)

[22] Hong SA, Kim SJ, Chung KY, Chun MS, Lee BG, Kim J, J. Supercrit. Fluids, 73, 70 (2013)

[23] Sue K, Murata K, Kimura K, Arai K, Green Chem., 5, 659 (2003)

[24] Sue K, Suzuki M, Arai K, Ohashi T, Ura H, Matsui K, Hakuta Y, Hayashi H, Watanabe M, Hiaki T, Green Chem., 8, 634 (2006)

[25] Ye Y, Yuan F, Li S, Mater. Lett., 60, 3175 (2006)

[26] Kim J, Park YS, Veriansyah B, Kim JD, Lee YW, Chem. Mater., 20, 6301 (2008)

[27] Sawyer DT, Roberts JL, Acc. Chem. Res., 21, 469 (1988)

[28] Tsang PKS, Sawyer DT, Inorg. Chem., 29, 2848 (1990)

[29] Hercules DM, Lytle FE, J. Am. Chem. Soc., 88, 4745 (1966)

[30] Srivatsa GS, Sawyer DT, Inorg. Chem., 24, 1732 (1985)

[31] Shin K, Kramer SK, Goff HM, Inorg. Chem., 26, 4103 (1987)