Impacts of MnO2 Crystal Structures and Fe Doping in Those on Photoelectrochemical Charge–Discharge Properties of TiO2/MnO2 Composite Electrodes,ACS Sustainable Chemistry & Engineering

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Impacts of MnO2 Crystal Structures and Fe Doping in Those on Photoelectrochemical Charge–Discharge Properties of TiO2/MnO2 Composite Electrodes
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-05-27 , DOI: 10.1021/acssuschemeng.0c02964
Hiroyuki Usui _{1,

2} , Shin Suzuki _{2,

3} , Yasuhiro Domi _{1,

2} , Hiroki Sakaguchi _{1,

2}

Affiliation

We investigated the impacts of MnO₂ crystal structures and Fe doping into the MnO₂ crystal structures on photoelectrochemical charge–discharge properties of composite electrodes composed of TiO₂ and MnO₂ polymorphs (α-, β-, γ-, and δ-phases) in aqueous Na₂SO₄ solution. In a conventional electrochemical capacitor, the α-MnO₂ electrode delivered the highest specific capacitance among the undoped MnO₂ polymorphs because of its larger tunnel structure compared with β- and γ-MnO₂. Since the electronic conductivity of the δ-MnO₂ electrode was very low, its performance was poor despite its large interlayer spacing. Fe doping into δ-MnO₂ improved its conductivity, leading to a remarkable enhancement in capacitance. The photoelectrochemical capacitor properties of the TiO₂/α-MnO₂ and TiO₂/δ-MnO₂ composite electrodes were improved by Fe doping into MnO₂. In particular, the TiO₂/Fe-doped δ-MnO₂ electrode presented a significant improvement. This was because the photoinduced electrons could move easily in the MnO₂ layer due to its improved conductivity, thereby promoting the Na⁺ storage reaction.

中文翻译：

MnO ₂晶体结构和其中的Fe掺杂对TiO ₂ / MnO ₂复合电极的光电化学充放电性能的影响

我们研究了MnO ₂晶体结构和Fe掺入MnO ₂晶体结构对TiO ₂和MnO ₂多晶型物（α-，β-，γ-和δ-相）组成的复合电极的光电化学充放电性能的影响。在Na ₂ SO ₄水溶液中。在传统的电化学电容器中，α-MnO的₂电极输送的未掺杂的MnO中的最高的比电容₂与β-和γ-MnO的比较，因为其较大的隧道结构的多晶型物₂。由于的电子传导性δ型的MnO ₂电极非常低，尽管其层间间距很大，但性能仍然很差。的Fe掺杂到δ-的MnO ₂提高其导电性，从而导致电容量的显着提高。在TiO的光电化学性质电容器₂ /α-MnO的₂和TiO ₂ /δ-的MnO ₂复合电极的Fe掺杂改进成的MnO ₂。特别是，在TiO ₂ / Fe掺杂δ-的MnO ₂电极呈现一个显著改善。这是因为光导电子由于其提高的电导率而易于在MnO ₂层中移动，从而促进了Na ⁺储存反应。

更新日期：2020-06-23

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