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Improving the Water Oxidation Efficiency with a Light-Induced Electric Field in Nanograting Photoanodes
journal contribution
posted on 2019-08-23, 21:15 authored by Wenrong Wang, Beidou Guo, Haitao Dai, Chang Zhao, Guancai Xie, Renping Ma, Muhammad Zain Akram, Hangyong Shan, Congzhong Cai, Zheyu Fang, Jian Ru GongSevere
charge recombination in solar water-splitting devices significantly
limits their performance. To address this issue, we design a frustum
of a cone nanograting configuration by taking the hematite and Au-based
thin-film photoanode as a model system, which greatly improves the
photoelectrochemical water oxidation activity, affording an approximately
10-fold increase in the photocurrent density at 1.23 V versus the
reversible hydrogen electrode compared to the planar counterpart.
The surface plasmon polariton-induced electric field in hematite plays
a dominant role in efficiency enhancement by facilitating charge separation,
thus dramatically increasing the incident photon-to-current efficiency
(IPCE) by more than 2 orders of magnitude in the near band gap of
hematite. And the relatively weak electric field caused by light scattering
in the nanograting structure is responsible for the approximate maximum
20-fold increase in IPCE within a broadband wavelength range. Our
scalable strategy can be generalized to other solar energy conversion
systems.
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band gapcone nanograting configurationbroadband wavelength rangecharge recombinationphotoelectrochemical water oxidation activityWater Oxidation Efficiencyphotocurrent density2 orderssurface plasmon polariton-inducedAu-based thin-film photoanodehematitecharge separationincident photon-to-current efficiencywater-splitting deviceshydrogen electrode1.23 Venergy conversion systemsnanograting structurescalable strategyLight-Induced Electric FieldNanograting Photoanodesmodel systemIPCEefficiency enhancement
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