Nickel Confined in the Interlayer Region of Birnessite: an Active Electrocatalyst for Water Oxidation.
Nickel Confined in the Interlayer Region of Birnessite: an Active Electrocatalyst for Water Oxidation.
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限制在水钠锰矿层间区域的镍：一种水氧化活性电催化剂。
DOI：
10.1002/anie.201601935
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Strongin,DanielR
中科院分区：
文献类型：
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作者：
Thenuwara,AkilaC;Cerkez,ElizabethB;Shumlas,SamanthaL;Attanayake,NuwanH;McKendry,IanG;Frazer,Laszlo;Borguet,Eric;Kang,Qing;Remsing,RichardC;Klein,MichaelL;Zdilla,MichaelJ;Strongin,DanielR
报道了一种通过在层间插入Ni2+离子来提高水钠石对析氧反应(OER)电催化活性的合成方法。电催化研究表明，镍(7.7原子 %)插层水钠铝石的过电位(η)为400 mV，阳极电流为10 mA cm−2。这一η明显低于水钠镍矿的η(η≈700 mV)和活性OER催化剂β-Ni(OH)2(η≈550 mV)。分子动力学模拟表明，镍阳离子、水和水钠石之间的相互作用竞争促进了空间受限层间区域的氧化还原化学。
We report a synthetic method to enhance the electrocatalytic activity of birnessite for the oxygen evolution reaction (OER) by intercalating Ni2+ions into the interlayer region. Electrocatalytic studies showed that nickel (7.7 atomic %)‐intercalated birnessite exhibits an overpotential (η) of 400 mV for OER at an anodic current of 10 mA cm−2. Thisηis significantly lower than theηvalues for birnessite (η≈700 mV) and the active OER catalyst β‐Ni(OH)2(η≈550 mV). Molecular dynamics simulations suggest that a competition among the interactions between the nickel cation, water, and birnessite promote redox chemistry in the spatially confined interlayer region.