화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.81, 427-439, January, 2020
DOI10.1016/j.jiec.2019.09.033  Export Citation
Effective charge separation in rGO/NiWO4@Au photocatalyst for efficient CO2 reduction under visible light
Jongmin Shin, Jun Neoung Heo, Jeong Yeon Do†, Young-Il Kim, Seog Joon Yoon, Yang Soo Kim1, and Misook Kang†
  • Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk-38541, Republic of Korea
  • 1Korea Basic Science Institute, Gwahak-ro, Yuseong-gu, Daejeon-34133, Republic of Korea
E-mail:,
Catalyst performance can be improved by introducing an electron donor into both the valence band (VB) and conduction band (CB) to facilitate charge separation and suppress electron-hole recombination. Herein, Au nanoparticles served as CB electron donors in NiWO4 core particles which were evenly dispersed on a reduced graphene oxide (rGO) sheet that served as a VB electron donor. The resulting rGO/ NiWO4@Au photocatalyst was applied to reducing CO2. The particles exhibited broadband absorbance from the ultraviolet to near-infrared, with a specific Au surface plasmon resonance (SPR) absorption peak at 600 nm. Moreover, the catalyst exhibited low photoluminescence (PL) and a high photocurrent density, indicating that photo-excited electron-hole recombination was suppressed and the charges effectively separated. Photocatalytic reduction of CO2 on rGO/NiWO4@Au was significantly enhanced as evidenced by the total amounts of reduction products (CO and CH4), which were 15 times those for NiWO4 and six times those for rGO/NiWO4 and NiWO4@Au. The expected electron-transfer mechanism on rGO/ NiWO4@Au involves electron donation into the VB from the p-electron rich rGO, combined with photo- excited electrons from the NiWO4 and Au particles where electrons on the Au surfaces were amplified by the SPR and then moved to the CB of NiWO4. Intensity-modulated photovoltage spectroscopy of rGO/ NiWO4@Au indicated a significantly reduced electron-hole recombination rate.
Keywords:Charge separation;Electron donor;Carbon dioxide photoreduction;rGO/NiWO4@Au
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