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Intercalating MnO2 Nanosheets With Transition Metal Cations to Enhance Oxygen Evolution
ChemCatChem ( IF 3.8 ) Pub Date : 2019-02-27 , DOI: 10.1002/cctc.201802019 Yue Yang 1, 2 , Xingsong Su 2 , Lei Zhang 2 , Peter Kerns 2 , Laura Achola 2 , Veronica Hayes 2 , Rebecca Quardokus 2 , Steven L. Suib 2, 3, 4 , Jie He 2, 3
ChemCatChem ( IF 3.8 ) Pub Date : 2019-02-27 , DOI: 10.1002/cctc.201802019 Yue Yang 1, 2 , Xingsong Su 2 , Lei Zhang 2 , Peter Kerns 2 , Laura Achola 2 , Veronica Hayes 2 , Rebecca Quardokus 2 , Steven L. Suib 2, 3, 4 , Jie He 2, 3
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The catalytic activity of MnO2 nanosheets towards oxygen evolution depends highly on their interlayer environment. We present a systematic investigation on fine‐tuning of the interlayer environment of MnO2 nanosheets by intercalation through a facile cation exchange with inexpensive first‐row transition metal cations, including Ni2+, Co2+, Cu2+, Zn2+, and Fe3+ ions. Among them, the Ni‐intercalated MnO2 nanosheets show remarkably enhanced OER activity and long‐term stability, compared to pristine MnO2 nanosheets. The overpotential of 330 mV at a current density of 10 mA cm−2 is observed for the Ni‐intercalated MnO2 nanosheets. The ehancement mechanism of OER is studied by comparing physiochemical properties, such as the oxidation state of Mn, the interlayer distance, the increase in the disorder/twisting of MnO6 octahedra, and the interlayer cooperative binding of water molecules. The Ni intercalation, different from other metal cations, strengthens the Mn−O bond perpendicularly to the layer chains to facilitate the interlayer catalysis possibly between two Mn sites, and thus promotes the efficiency of oxygen evolution.
中文翻译：
插入带有过渡金属阳离子的MnO2纳米片以增强氧气的释放
MnO 2纳米片对氧的催化活性在很大程度上取决于其夹层环境。我们目前的的MnO夹层环境的微调系统调查2个通过与廉价的第一行过渡金属阳离子，包括镍一个浅显的阳离子交换通过嵌入纳米片2+，钴2+，铜2+，锌2+，和Fe 3+离子。其中，与原始MnO 2纳米片相比，Ni插入的MnO 2纳米片显示出显着增强的OER活性和长期稳定性。在10 mA cm -2的电流密度下为330 mV的过电势观察到镍插层的MnO 2纳米片。通过比较诸如Mn的氧化态，层间距离，MnO 6八面体的MnO 6的无序/扭曲增加以及水分子的层间协同结合等理化特性，研究了OER的增强机理。与其他金属阳离子不同，Ni插层可增强垂直于层链的Mn-O键，以促进可能在两个Mn位点之间的层间催化，从而提高氧气释放的效率。
更新日期：2019-02-27
中文翻译：
插入带有过渡金属阳离子的MnO2纳米片以增强氧气的释放
MnO 2纳米片对氧的催化活性在很大程度上取决于其夹层环境。我们目前的的MnO夹层环境的微调系统调查2个通过与廉价的第一行过渡金属阳离子，包括镍一个浅显的阳离子交换通过嵌入纳米片2+，钴2+，铜2+，锌2+，和Fe 3+离子。其中，与原始MnO 2纳米片相比，Ni插入的MnO 2纳米片显示出显着增强的OER活性和长期稳定性。在10 mA cm -2的电流密度下为330 mV的过电势观察到镍插层的MnO 2纳米片。通过比较诸如Mn的氧化态，层间距离，MnO 6八面体的MnO 6的无序/扭曲增加以及水分子的层间协同结合等理化特性，研究了OER的增强机理。与其他金属阳离子不同，Ni插层可增强垂直于层链的Mn-O键，以促进可能在两个Mn位点之间的层间催化，从而提高氧气释放的效率。
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