| 초록 |
Here, we demonstrate that reduce graphene oxide (rGO), as a low cost, chemically stable, and high conductivity, can used as a hole transporting layer to fabricate Co3O4-rGO-BiVO4 photoanode, showing an excellent photoelectrochemical (PEC) water splitting performance. The Co3O4-rGO-BiVO4 photoanode has achieved a remarkable photocurrent density of 2.6 mA/cm2 at 1V vs. SCE under AM 1.5G solar light irradiation, which is 3.7 fold increase compared with pristine BiVO4 (0.7 mA/cm2). The highest incident photon-to-current conversion efficiency (IPCE) achieve 40.3% at 430 nm, and the maximal surface charge injection efficiency (ηinjection) reaches 57% at 0.5 V versus SCE, which are nearly 4 and 5.7 times higher than that of pristine BiVO4 photoanode, respectively. The Co3O4-rGO-BiVO4 photoanode exhibits a highly stable photocurrent density was observed for at least 3 h. Collectively, the results demonstrated that rGO shows great potential as a hole-transporting layer for photoanode and Co3O4-rGO-BiVO4 is an efficient and stable photoanode material with a promising potential application for PEC water splitting. |
