Epitaxial growth of three-dimensional (3D) architectures has led to new opportunities in the optoelectronic devices and nanoscale thermal engineering. The feature that makes these materials distinct is to form a complex geometry while preserving crystal epitaxy. This enables to exploit functionalities given by 3D interconnected pores and suppress charge trapping at defects. One technology that finds it useful is electrochemical energy storage in response to ultrafast alternate current (AC) switch. Here, we extend the concept of 3D mesostructured single crystals to electrochemical capacitors (ECs) for AC line filtering. We present bottom-up epitaxial infilling of Fe 3 O 4 into the selfassembled 300 nm diameter colloid templates using electrodeposition. The resulting 3D mesostructured single crystalline Fe 3-δ O 4 (111) film (δ ≈ À0.06) is highly oriented along both out-of-plane and in-plane crystallographic orienta-

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