Direct Synthesis of Molybdenum Phosphide Nanorods on Silicon Using Graphene at the Heterointerface for Efficient Photoelectrochemical Water Reduction  

作　　者：Sang Eon Jun Seokhoon Choi Shinyoung Choi Tae Hyung Lee Changyeon Kim Jin Wook Yang Woon‑Oh Choe In‑Hyuk Im Cheol‑Joo Kim Ho Won Jang 

机构地区：[1]Department of Materials Science and Engineering,Research Institute of Advanced Materials,Seoul National University,Seoul 08826,Republic of Korea [2]Department of Chemical Engineering,Pohang University of Science and Technology,Pohang 37673,Republic of Korea

出　　处：《Nano-Micro Letters》2021年第5期135-150,共16页纳微快报（英文版）

基　　金：financially supported by the Basic Science Research Program(2017R1A2B3009135);the Korean government MSIT(2019M3E6A1103818);the Basic Research Laboratory Program(2018R1A4A1022647);the Future Material Discovery Program(2018M3D1A1058793)through the National Research Foundation of Korea;KOREA HYDRO&NUCLEAR POWER CO.,LTD.(No.2018-Tech-21)。

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.

关 键 词：Photoelectrochemical water splitting SILICON Molybdenum phosphide Hydrogen evolution GRAPHENE 

分 类 号：TQ426[化学工程] TB383.1[一般工业技术—材料科学与工程]