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We propose a facile and versatile strategy for the fabrication of a hierarchically crossed metal oxide nanosheet array on a monolithic FeOx substrate. This strategy can also be extended to synthesize a composite metal oxide nanosheet array, in which the composition can be easily modulated. The as-obtained hierarchically crossed metal oxide nanosheet array exhibited high catalytic activities for diesel soot elimination owing to the enhanced contact efficiency between soot particulates and macroporous catalysts.

Graphical abstract: Controlled synthesis of hierarchically crossed metal oxide nanosheet arrays for diesel soot elimination

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