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Abstract Aqueous trivalent metal batteries represent a compelling candidate for energy storage due to the intriguing three‐electron transfer reaction and the distinct properties of trivalent cations. However, little research progress has been achieved with trivalent batteries due to the inappropriate redox potentials and drastic ion hydrolysis side reactions. Herein, the appealing yet underrepresented trivalent indium is selected as an advanced metal choice and the crucial effect of substrate on its plating mechanism is revealed. When copper foil is used, an indiophilic indium‐copper alloy interface can be formed in situ upon plating, exhibiting favorable binding energies and low diffusion energy barriers for indium atoms. Consequently, a planar, smooth, and dense indium metal layer is uniformly deposited on the copper substrate, leading to outstanding plating efficiency (99.8–99.9%) and an exceedingly long lifespan (6.4–7.4 months). The plated indium anode is further paired with a high‐mass‐loading Prussian blue cathode (2 mAh cm⁻²), and the full cell (negative/positive electrode capacity, N/P = 2.5) delivers an excellent cycling life of 1000 cycles with 72% retention. This work represents a significant advancement in the development of high‐performance trivalent metal batteries. 

Deferasirox (Def), an orally administered iron‐chelating drug, has drawn significant interest in repurposing for anticancer application due to the elevated Fe demand by cancer cells. But there are also concerns about its severe off target health effects. Herein Cu(II) binding is studied as a potential off target interaction. The aqueous solution stability and speciation of the ternary complex Cu(Def)(pyridine) was studied by UV‐Vis and EPR spectroscopy, ESI‐mass spectrometry, and cyclic voltammetry under physiologically relevant conditions. The complex is observed to be a redox active, mononuclear Cu(II) complex in square planar geometry. UV‐Vis spectroscopy demonstrates that at pH 7.4 the complex is quite stable (ϵ337nm =10,820 M^−1cm^−1) with a log K=16.65±0.1. Cu scavenging from the Cu transporters ceruloplasmin and albumin was also studied. Def does not inhibit ceruloplasmin activity but forms a ternary Cu(II) complex at the bovine serum albumin ATCUN site. Cu(Def)(py) displays potent but nonselective cytotoxicity against A549 cancer and MRC‐5 noncancer lung cells but the potency of the ternary protein complex was more moderate. This work elucidates potential Def toxicity from Cu complexation in the body but also cytotoxic synergy between the metal and chelator that informs on new drug design directions.