In the active Mn4CaO5 cluster of the natural water oxidation system, one of the dangling Mn atom is surrounded by water molecules through coordination and hydrogen bonding. It means that the enrichment of water molecules around the Mn catalysts has a positive effect on the water oxidation catalysis. Inspired by nature photosynthesis, the hydrophilic surfaces are believed to be able to capture water molecules to assist water oxidation. Herein, we report MnO2@PFANI nanowires with improved mass transfer efficiency and conductivity for electrocatalytic water oxidation. The as-prepared nanowires are synthesized by coating hydrophilic polymers on MnO2 nanowires. The hydrophilic surface captures water molecule and promote mass transfer processes, and the conductivity of the polymer can also increase charge transfer processes. To reach a current density of 10 mA cm-2, a low overpotential of 440 mV is required in a 1.0 M KOH solution for the MnO2@PFANI nanowires. The hydrophilicity and conductivity are systematically investigated by both physical and electrochemical measurements. This study provides a surface engineering idea for the fabrication of efficient electrocatalysts.

中文翻译：

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亲水性二氧化锰纳米线涂覆邻氟苯胺用于电催化水氧化

在天然水氧化系统的活性Mn4CaO5簇中，其中一个悬挂的Mn原子通过配位和氢键被水分子包围。这意味着Mn催化剂周围水分子的富集对水氧化催化具有积极作用。受自然光合作用的启发，亲水表面被认为能够捕获水分子以协助水氧化。在此，我们报道了 MnO2@PFANI 纳米线，其在电催化水氧化方面具有改进的传质效率和电导率。通过在 MnO2 纳米线上涂覆亲水性聚合物来合成所制备的纳米线。亲水表面捕获水分子并促进传质过程，并且聚合物的导电性也可以增加电荷转移过程。为了达到 10 mA cm-2 的电流密度，MnO2@PFANI 纳米线的 1.0 M KOH 溶液需要 440 mV 的低过电势。通过物理和电化学测量系统地研究了亲水性和电导率。这项研究为高效电催化剂的制造提供了表面工程思路。