  A constant increase in the need of clean energy demands more innovation from
the research community. Active and stable materials that can make use of the
solar radiation to promote different reactions are the cornerstone of emerging
technologies. Polymeric carbon nitrides that harvest solar radiation to drive
electrochemical reactions are considered solid candidates. In this respect,
polymeric carbon nitrides were prepared by the thermal polycondensation of
melamine. As-obtained materials were characterized by synchrotron radiation and
lab-based techniques. The electron band structure was fully characterized by a
combined electrochemical optoelectronic study. Electron microscopy studies
before and after the photoelectrochemical experiments showed morphological and
structure degradation. The work at-hand concludes that polymeric carbon
nitrides are prone to photoelectrochemical degradation at high overpotentials.
