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Received June 7, 2007
Accepted April 2, 2008
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Preparation of platinum-doped hollow spheres and their electrocatalytic activity in water electrolysis
Graduate School of Energy and Environment, Seoul National University of Technology, 172 Gongneung-2 dong, Nowon-gu, Seoul 139-743, Korea
daewon@snut.ac.kr
Korean Journal of Chemical Engineering, July 2008, 25(4), 775-779(5), 10.1007/s11814-008-0127-x
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Abstract
Pure TiO2 hollow spheres were prepared by using poly(styrene-methacrylic acid) latex particles as template; thereafter, titania hollow spheres were coated by platinum with an appropriate amount of choloroplatinic acid solution to obtain Pt/TiO2 catalysts. The morphology and structure of nonstructural Pt/TiO2 hollow spheres were characterized by BET, XRD, TGA, SEM and TEM analysis. In the samples, a remarkably uniform layer of Pt consisting of particles from 5 to 70 nm in size was formed over TiO2 hollow spheres. We found the electrocatalytic nature of the samples by cyclic voltammetric experiment in acidic solution. The anodic peak current density of 20 wt% Pt-loaded TiO2 hollow particles was observed 2.5 times higher than that of 5 wt% Pt/TiO2 in the same experimental condition. Also, the anodic current density of 20 wt% Pt/TiO2 hollow spheres calcined at various temperatures followed the order: 400 ℃.500 ℃>600 ℃. The electrocatalytic activity of the Pt-loaded TiO2 hollow spheres depends on the amount of atomic platinum present in the sample; a higher concentration of platinum results in a larger current density value in anodic sweep, resulting in more oxygen production during electrolysis. Pt/TiO2 hollow sphere catalysts have also shown long term electrocatalytic stability in acidic media.
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Mukerjee S, Srinivasan S, Soriaga MP, Mcbreen J, J. Electrochem. Soc., 142(5), 1409 (1995)
Hayden BE, Malevich DV, Pletcher D, Electrochem. Commun., 3, 395 (2001)
Balko EN, Studies Inrog. Chem., 11, 267 (1991)
Cheng X, Zeng P, Hu S, Kuang T, Xie G, Gao F, Rare Metals, 25, 190 (2006)
Jung HS, Lee SW, Kim JY, Hong KS, Lee YC, Koh KH, J. Colloid Interface Sci., 279(2), 479 (2004)
Damm C, Muller FW, Israel G, Gablenz S, Abicht HP, Dyes Pigment., 56, 151 (2003)
Deng HH, Mao HF, Lu ZH, Xu HJ, Thin Solid Films, 315(1-2), 244 (1998)
Drew K, Girishkumar G, Vinodgopal K, Kamat PV, J. Phys. Chem. B, 109, 11581 (2005)
Hagfeldt A, Gratzel M, Chem. Rev., 95, 49 (1995)
Hoffmann MR, Martin ST, Choi WY, Bahnemann DW, Chem. Rev., 95(1), 69 (1995)
Srinivasan S, Datye AK, Smith AS, Wachs IE, Deo G, Jehng JM, Turek AM, Peden CHF, J. Catal., 131, 260 (1991)
Li GC, Zhang ZK, Mater. Lett., 58, 2768 (2004)
Kim HR, Choi KY, Shul YG, Korean J. Chem. Eng., 24(4), 596 (2007)
Wang MH, Woo KD, Kim DK, Energy Conv. Manag., 47(18-19), 3235 (2006)
Frelink T, Visscher W, Vanveen JA, J. Electroanal. Chem., 382(1-2), 65 (1995)
