| 초록 |
As one of the most promising methods to produce solar fuel, photoelectrochemical (PEC) water splitting has paid attention due to eco-friendly and sustainable properties. Copper tungstate (CuWO4) is one of promising photoanodes due to its novel properties such as high theoretical photocurrent density (~10 mA/cm2), small band gap (2.2–2.4 eV), suitable band edge position for water oxidation and good photostability in broad pH range. However, CuWO4 has intrinsic drawbacks, such as abundant charge recombination, slow charge transport, and sluggish surface kinetics. Moreover, to reach high performance for oxygen evolution reaction (OER), improvement of surface kinetics is essential. In this study, to overcome above-mentioned disadvantages, we introduced the phosphorylation treatment on the surface of CuWO4 photoanode. CuWO4 surface kinetic and charge kinetics can be improved due to the phosphate-based treated surface has lower free energy for hydroxyl radical (OH*) formation. |
