The Role of Al³⁺‐Based Aqueous Electrolytes in the Charge Storage Mechanism of MnO_x Cathodes

Rechargeable aqueous aluminium batteries are the subject of growing interest, however, the charge storage mechanisms at manganese oxide‐based cathodes remain poorly understood. In essense, every study proposes a different mechanism. Here, an in situ spectroelectrochemical methodology is used to unambiguously demonstrate that reversible proton‐coupled MnO 2 ‐to‐Mn 2+ conversion is the main charge storage mechanism occurring at MnO 2 cathodes for...