AgCu/TiO2 hot-electron device for solar water splitting: the mechanisms of LSPR and time-domain characterization |
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| Affiliation: | 1. MERLin, School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;2. Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052, Australia;3. MERLin, School of Chemistry, University of Sydney, NSW 2006, Australia;1. Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Republic of Korea;2. National NanoFab Center, 291 Daehak-ro Yuseong-gu, Daejeon 34141, Republic of Korea;3. MNTek Co., Ltd.,1113, 260, Changnyong-daero, Suwon-si, Yeongtong-gu, Gyeonggi-do, Republic of Korea;1. School of Chemistry and Chemical Engineering, Qingdao University, Ningxia Road 308, Qingdao 266071, China;2. Qingdao Hengxing University of Science and Technology, Jiushui East Road 588, Qingdao 266100, China;1. Bio-inspired and Advanced Energy Research Center, Department of Engineering Mechanics, Northwestern Polytechnical University, Xi''an, Shaanxi 710129, China;2. Huawei Digital Power Technologies Co., Ltd, Xi''an, Shaanxi 710129, China;1. Department of Physics, University of Agriculture Faisalabad, 38040, Pakistan;2. Department of Chemistry, University of Agriculture Faisalabad, 38040, Pakistan;3. Department of Physics, University of Okara, Okara, Pakistan;4. Department of Chemistry, College of Science, King Khalid University, Abha, 61413 Saudi Arabia;1. Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, No.2 Si Pai Lou, Nanjing 210096, China;2. School of Electronic Engineering, Nanjing Xiao Zhuang University, 211171 Nanjing, China;3. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi''an Jiaotong University, Xian 710049, China |
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| Abstract: | More and more metal/semiconductor nanostructures have been served as a hot-electron device with the localized surface plasmonic resonance (LSPR) effect to boost hydrogen evolution from solar water splitting. In this work, bimetallic AgCu with optimal ratio are deposited onto TiO2 nanopore/nanotube arrays to construct AgCu/TiO2 photoanode for photoelectrochemical water splitting, a novel simulation characterization to visualize the LSPR process is proposed. The near electric field enhancement and plasmon resonance energy transfer mechanisms of single Ag and Cu are inferred by time-domain characterization, illustrating the contradictory photocurrent under AM 1.5 illumination with its LSPR effect based on the particle size. The variation of local electric field over time within the interfaces of AgCu bimetals and bimetal/TiO2 models reveals the migration of hot electrons from Ag into Cu and the synergetic effect of different LSPR mechanisms. The resulting higher photoelectrochemical activities of AgCu/TiO2 also verifies the positive roles of the coexistence of AgCu on electron generation and energy transfer to interband excitation of TiO2. |
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| Keywords: | Solar water splitting Hot-electron device Time-domain characterization LSPR |
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