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The enhanced performance of 3C-SiC photocathodes for the generation of hydrogen through the use of cocatalysts
B. A. Pinaud, J. D. Benck, L. C. Seitz, A. J. Forman, Z. Chen, T. G. Deutsch, B. D. James, K. N. Baum, G. N. Baum, S. Ardo, H. Wang, E. Miller, and T. F. Jaramillo, Energy Environ. Sci. 6, 1983 (2013).
M. E. Baumgartner and Ch. J. Raub, Platinum Met. Rev. 32, 188 (1988).
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We formed Pt or Pd particles as cocatalysts on a 3C-SiC photocathode.
Photocurrents from the 3C-SiC photocathodes increased by presence of the cocatalysts, and there was an optimum particle size of cocatalysts for the photocurrents. By the measurements of chopped light photocurrent-voltage characteristics and spectral responses, we also confirmed the enhanced charge transfer from the 3C-SiC photocathodes to hydrogen owing to the presence of cocatalysts. A 3C-SiC photocathode with Pt cocatalysts showed the highest hydrogen production volume by water splitting. The energy conversion efficiency of the 3C-SiC photocathode with Pt cocatalysts was 0.52%.
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