ELECTRICALLY CONDUCTIVE DIAMOND ELECTRODE, AND SULFURIC ACID ELECTROLYSIS METHOD AND SULFURIC ACID ELECTROLYSIS APPARATUS EACH UTILIZING SAME

摘要

The present invention provides an electrically conductive diamond electrode comprising an electrically conductive substrate and an electrically conductive diamond layer coated on the surface of the electrically conductive substrate, featuring that:
1) the thickness of the electrically conductive diamond layer is 1ˆ¼25µm,
2) the potential window fulfills Equation (1) and
3) the ratio (A/B) of the diamond component A and the non-diamond component B by the Raman spectroscopic analysis fulfills Equation (2). 2.1 �¢ V ‰¦ potential window ‰¦ 3.5 �¢ V 1.5 < A / B ‰¦ 6.5
A:
Intensity at the wave number 1300cm -1 by the Raman spectroscopic analysis
B:
Intensity at the wave number 1500cm -1 by the Raman spectroscopic analysis. The present invention intends to provide an electrically conductive diamond electrode with a high durability as electrode, which achieves a high current efficiency of oxidizing agent at a low cell voltage by controlling the thickness of the electrically conductive diamond layer and crystallinity of the electrically conductive diamond, a sulfuric acid electrolysis method and an electrolysis apparatus of sulfuric acid applying the electrically conductive diamond electrode.