Photoelectrochemical cell using silicon carbide and Pt electrodes can split water into H2 and O2 without any external bias. Maximum photovoltage was ca. 0.45 V for a <p-SiC/H2O/Pt> photocell and 2.2V for a <p-SiC/H2O/n-SiC> photocell. Energy conversion efficiency to H2 was ca. 0.4% for irradiation with a 500 W Xe lamp.
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Inoue et al. (1985) studied this question.
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