Crystal Facet Engineering of TiO_(2) Nanostructures for Enhancing Photoelectrochemical Water Splitting with BiVO_(4) Nanodots  

作　　者：Mi Gyoung Lee Jin Wook Yang Hoonkee Park Cheon Woo Moon Dinsefa M.Andoshe Jongseong Park Chang‑Ki Moon Tae Hyung Lee Kyoung Soon Choi Woo Seok Cheon Jang‑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 Chemistry and Nanoscience,Ewha Womans University,Seoul 03693,Republic of Korea [3]National Research Facilities and Equipment Center,Korea Basic Science Institute,Daejeon 34133,Republic of Korea [4]Advanced Institute of Convergence Technology,Seoul National University,Suwon 16229,Republic of Korea

出　　处：《Nano-Micro Letters》2022年第3期201-215,共15页纳微快报（英文版）

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(MSIT)(2021R1A2B5B03001851);the NRF Grant funded by the Korean government MSIT(2021M3H4A1A03057403).M.G.L.acknowledges the Basic Science Research Program through the NRF funded by the Ministry of Education(2021R1A6A3A03039988).J.W.Y.acknowledges the Basic Science Research Program through the NRF funded by the Ministry of Education(2021R1A6A3A13046700).

摘　　要：Although bismuth vanadate(BiVO4)has been promising as photoanode material for photoelectrochemical water splitting,its charge recombination issue by short charge diffusion length has led to various studies about heterostructure photoanodes.As a hole blocking layer of BiVO4,titanium dioxide(TiO_(2)) has been considered unsuitable because of its relatively positive valence band edge and low electrical conductivity.Herein,a crystal facet engineering of TiO_(2) nanostructures is proposed to control band structures for the hole blocking layer of BiVO4 nanodots.We design two types of TiO_(2) nanostructures,which are nanorods(NRs)and nanoflowers(NFs)with different(001)and(110)crystal facets,respectively,and fabricate BiVO4/TiO_(2) heterostructure photoanodes.The BiVO4/TiO_(2) NFs showed 4.8 times higher photocurrent density than the BiVO4/TiO_(2) NRs.Transient decay time analysis and time-resolved photoluminescence reveal the enhancement is attributed to the reduced charge recombination,which is originated from the formation of type II band alignment between BiVO4 nanodots and TiO_(2) NFs.This work provides not only new insights into the interplay between crystal facets and band structures but also important steps for the design of highly efficient photoelectrodes.

关 键 词：Crystal facet control Bismuth vanadate Titanium dioxide HETEROJUNCTION Water splitting 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ116.2[化学工程—无机化工]