Heterojunction Engineering of g‐C3N4 with CuO for Enhanced Photocatalytic and Photoelectrochemical Performance

While g‐C 3 N 4 gains increasing attention as a polymeric semiconductor material for photo(electrochemical)applications, various strategies are deployed for enhancing the performance of g‐C 3 N 4 , among which heterojunction engineering remains the most preferred due to its high simplicity and efficiency. This work uses a facile wet impregnation to obtain a synergistic g‐C 3 N 4 /CuO heterojunction with reduced interfacial resistance. Maximum performance is exhibited at a CuO loading of 5% (by weight). The photocatalytic efficiency can be established by assessing ciprofloxacin degradation under visible light irradiation. A photocurrent density of −3.5 mA cm −2 at −0.67 V is observed when the material is used as a photocathode in a neutral medium, and integration with g‐C 3 N 4 can address the stability issues associated with bare CuO photocathodes.