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As an emerging energy storage concept, Al–CO2 batteries have not yet been demonstrated as a rechargeable system that can deliver a high discharge voltage and a high capacity. In this work, we present a homogeneous redox mediator to access a rechargeable Al–CO2 battery with an ultralow overpotential of 0.05 V. In addition, the resulting rechargeable Al–CO2 cell can maintain a high discharge voltage of 1.12 V and delivers a high capacity of 9394 mAh/gcarbon. Nuclear magnetic resonance (NMR) analysis indicates that the discharge product is aluminum oxalate which can facilitate the reversible operation of Al–CO2 batteries. The rechargeable Al–CO2 battery system demonstrated here holds great promise as a low-cost and high-energy alternative for future grid energy storage applications. Meanwhile, the Al–CO2 battery system could facilitate capture and concentration of atmospheric CO2, ultimately benefiting both the energy and environmental sectors of society.

This review covers recent progress and advancements in bio‐templating nanomaterials for use in energy applications. Viruses, bacteria, and fungus, as well as plant and animal biomasses such as woods, coffee grounds, and crab shells, can be used as the templates or carbon sources for metal‐ and carbon‐based nanomaterials. Here we provide an overview of each of these materials as a template, with emphasis on the synthesis methods and qualities of nanomaterials fabricated using these templates. Research in this field is understandably diverse, as such, we aim to further its development by providing a timely summary of current research. We anticipate that this field will continue to prove highly applicable to the salient and growing topics of renewable energy.