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Enhanced hybrid photocatalytic dry reforming using a phosphated Ni-CeO2 nanorod heterostructure
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Enhanced hybrid photocatalytic dry reforming using a phosphated Ni-CeO2 nanorod heterostructure
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Journal Article
Enhanced hybrid photocatalytic dry reforming using a phosphated Ni-CeO2 nanorod heterostructure
2023
Overview
Operating the dry reforming reaction photocatalytically presents an opportunity to produce commodity chemicals from two greenhouse gases, carbon dioxide and methane, however, the top-performing photocatalysts presented in the academic literature invariably rely on the use of precious metals. In this work, we demonstrate enhanced photocatalytic dry reforming performance through surface basicity modulation of a Ni-CeO
2
photocatalyst by selectively phosphating the surface of the CeO
2
nanorod support. An optimum phosphate content is observed, which leads to little photoactivity loss and carbon deposition over a 50-hour reaction period. The enhanced activity is attributed to the Lewis basic properties of the PO
4
3−
groups which improve CO
2
adsorption and facilitate the formation of small nickel metal clusters on the support surface, as well as the mechanical stability of CePO
4
. A hybrid photochemical-photothermal reaction mechanism is demonstrated by analyzing the wavelength-dependent photocatalytic activities. The activities, turnover numbers, quantum efficiencies, and energy efficiencies are shown to be on par with other dry-reforming photocatalysts that use noble metals, representing a step forward in understanding how to stabilize ignoble nickel-based dry reforming photocatalysts. The challenges associated with comparing the performance of photocatalysts reported in the academic literature are also commented on.
The top-performing dry reforming photocatalysts in the literature rely on the use of precious metals. Here, enhanced photocatalytic dry reforming performance is reported through surface basicity modulation of a Ni/CeO
2
photocatalyst, achieved by selectively phosphating the surface of a CeO
2
nanorod support.
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