Cr-doped CoFe layered double hydroxides: Highly efficient and robust bifunctional electrocatalyst for the oxidation of water and urea
Cr-doped CoFe layered double hydroxides: Highly efficient and robust bifunctional electrocatalyst for the oxidation of water and urea
复制标题
Cr 掺杂 CoFe 层状双氢氧化物：用于水和尿素氧化的高效且稳定的双功能电催化剂
DOI：
10.1016/j.apcatb.2020.118959
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发表时间：
2020-09-05
影响因子：
22.1
通讯作者：
Li, Huaming
中科院分区：
文献类型：
--
作者：
Wang, Zhaolong;Liu, Wenjun;Li, Huaming
析氧反应（OER）和尿素氧化反应（UOR）在氢能制备和污染治理领域发挥着重要作用。在这项工作中，我们成功合成了在镍泡沫（NF）上均匀生长的Cr掺杂CoFe层状双氢氧化物（LDH）纳米片阵列。部分氧化的Cr6+在氧化过程中，凭借其较强的吸电子能力，可以调整电子结构，稳定高价活性位点。密度泛函理论（DFT）计算表明，将Cr掺入CoFe LDH中可以明显克服OER过程中H2O吸附的步骤。因此，CoFeCr LDH/NF电极表现出优异的OER性能。此外，作为UOR电极时，其性能也令人满意。 CoFeCr LDH/NF的设计将为构建更多双功能电极开辟一条全新途径，用于在有或没有尿素的碱性溶液中电催化水分解。
Oxygen evolution reaction (OER) and urea oxidation reaction (UOR) play important roles in the field of hydrogen energy preparation and pollution treatment. In this work, we successfully synthesize a Cr doped CoFe layered double hydroxides (LDH) nanosheets array with uniform growth on a nickel-foam (NF). The partially oxidized Cr6+ during the process of oxidation could adjust the electronic structure and stabilize the high-valence active sites by virtue of its strong electron-withdrawing ability. The calculation of density functional theory (DFT) shows that the incorporation of Cr into CoFe LDH could obviously overcome the step of H2O adsorption during the OER progress. Therefore, the CoFeCr LDH/NF electrode exhibits superior OER performance. Furthermore, when acted as a UOR electrode, its performance is also satisfying. The design of the CoFeCr LDH/NF would hew out a brand-new route to construct more bifunctional electrodes for electrocatalytic water splitting in an alkaline solution with or without urea.