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Sn metal is a preferable choice as anode material for aqueous acidic batteries due to its acid‐tolerance, non‐toxicity, and ease of recycling. However, the large size and irregular deposition morphology of polyhedral Sn particles are bad for constructing stable and high‐capacity Sn metal anode because of severe hydrogen evolution and metal shedding. To tackle this critical issue, 4‐tert‐octylphenol...