• 文献标题:   Direct Synthesis of Molybdenum Phosphide Nanorods on Silicon Using Graphene at the Heterointerface for Efficient Photoelectrochemical Water Reduction
  • 文献类型:   Article
  • 作  者:   JUN SE, CHOI S, CHOI S, LEE TH, KIM C, YANG JW, CHOE WO, IM IH, KIM CJ, JANG HW
  • 作者关键词:   photoelectrochemical water splitting, silicon, molybdenum phosphide, hydrogen evolution, graphene
  • 出版物名称:   NANOMICRO LETTERS
  • ISSN:   2311-6706 EI 2150-5551
  • 通讯作者地址:  
  • 被引频次:   13
  • DOI:   10.1007/s40820-021-00605-7
  • 出版年:   2021

▎ 摘  要

Transition metal phosphides (TMPs) and transition metal dichalcogenides (TMDs) have been widely investigated as photoelectrochemical (PEC) catalysts for hydrogen evolution reaction (HER). Using high-temperature processes to get crystallized compounds with large-area uniformity, it is still challenging to directly synthesize these catalysts on silicon photocathodes due to chemical incompatibility at the heterointerface. Here, a graphene interlayer is applied between p-Si and MoP nanorods to enable fully engineered interfaces without forming a metallic secondary compound that absorbs a parasitic light and provides an inefficient electron path for hydrogen evolution. Furthermore, the graphene facilitates the photogenerated electrons to rapidly transfer by creating Mo-O-C covalent bondings and energetically favorable band bending. With a bridging role of graphene, numerous active sites and anti-reflectance of MoP nanorods lead to significantly improved PEC-HER performance with a high photocurrent density of 21.8 mA cm(-2) at 0 V versus RHE and high stability. Besides, low dependence on pH and temperature is observed with MoP nanorods incorporated photocathodes, which is desirable for practical use as a part of PEC cells. These results indicate that the direct synthesis of TMPs and TMDs enabled by graphene interlayer is a new promising way to fabricate Si-based photocathodes with high-quality interfaces and superior HER performance.