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<p>We report a photoresponsive Zn-ion battery (ZIB) using an ultrathin Mn₃O₄ cathode derived from Mn(BTC = 1,3,5-benzenetricarboxylic acid) metal–organic framework (MOF) via an additive-free alternating current-electrophoretic deposition method. This approach enables fabrication of an interface-sensitive electrode platform without binders or conductive agents, allowing direct probing of intrinsic photoelectrochemical properties. Upon blue light (450&#xa0;nm) illumination, the Mn₃O₄ cathode exhibited a dramatic increase in specific capacity—rising from ~1200 to over 2400&#xa0;mAh&#xa0;g<sup>−1</sup> along with enhanced redox kinetics and broadened voltage plateaus. Cyclic voltammetry and kinetic analyses confirmed that photoactivation primarily boosted diffusion-controlled charge storage, particularly at lower scan rates and current densities. Notably, the photoinduced enhancement persisted even after switching off the light, indicating a lasting interfacial modification. These findings demonstrate the promise of MOF-derived, binder-free photoelectrodes in light-responsive energy storage and provide a platform for understanding photon-coupled ion transport mechanisms at the electrode/electrolyte interface.</p>

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Smart Mn3O4 cathodes derived from Mn(BTC = 1,3,5-benzenetricarboxylic acid) for zinc-ion batteries: light-modulated kinetics and charge storage mechanisms

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Byoungnam Park

摘要

We report a photoresponsive Zn-ion battery (ZIB) using an ultrathin Mn₃O₄ cathode derived from Mn(BTC = 1,3,5-benzenetricarboxylic acid) metal–organic framework (MOF) via an additive-free alternating current-electrophoretic deposition method. This approach enables fabrication of an interface-sensitive electrode platform without binders or conductive agents, allowing direct probing of intrinsic photoelectrochemical properties. Upon blue light (450 nm) illumination, the Mn₃O₄ cathode exhibited a dramatic increase in specific capacity—rising from ~1200 to over 2400 mAh g−1 along with enhanced redox kinetics and broadened voltage plateaus. Cyclic voltammetry and kinetic analyses confirmed that photoactivation primarily boosted diffusion-controlled charge storage, particularly at lower scan rates and current densities. Notably, the photoinduced enhancement persisted even after switching off the light, indicating a lasting interfacial modification. These findings demonstrate the promise of MOF-derived, binder-free photoelectrodes in light-responsive energy storage and provide a platform for understanding photon-coupled ion transport mechanisms at the electrode/electrolyte interface.