Fast electrosynthesis of Fe-containing layered double hydroxide arrays toward highly efficient electrocatalytic oxidation reactions.
Fast electrosynthesis of Fe-containing layered double hydroxide arrays toward highly efficient electrocatalytic oxidation reactions.
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DOI：
10.1039/c5sc02417j
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发表时间：
2015-11-01
期刊：
影响因子：
8.4
通讯作者：
Duan X
中科院分区：
文献类型：
--
作者：
Li Z;Shao M;An H;Wang Z;Xu S;Wei M;Evans DG;Duan X
含铁层状双氢氧化物阵列的快速电合成及其对小分子氧化反应的高效电催化性能。提出了一种制备含铁层状双氢氧化物(MFe-LDHs，M=Ni，Co，Li)层状纳米阵列的新的电化学合成路线，该纳米阵列对几种小分子(水、肼、甲醇和乙醇)的氧化反应具有高效的电催化性能。垂直于衬底表面的超薄MFe-LDH纳米片(横向长200-300 nm，厚度8-12 nm)是在阴极电位下在数百秒内(<；300 S)直接制备的。所得NiFe-LDH纳米片阵列在析氧反应中表现出良好的性能，在10.0 mA·cm~(-2)处产生了相当低的过电位(0.224 V)，稳定性大大提高，远远优于以往报道的电氧化催化剂和最先进的Ir/C催化剂。此外，MFE-LDH纳米片阵列还可以有效地催化其他几种燃料分子(如联氨、甲醇和乙醇)的氧化，具有令人满意的电催化活性和较高的操作稳定性。特别是这种含铁水滑石的制备方法具有快速、高效、规模化生产的特点，在水分离、燃料电池等清洁能源装置中具有广阔的应用前景。
Fast electrosynthesis of Fe-containing layered double hydroxide arrays and their highly-efficient electrocatalytic performance toward small molecule oxidation reactions. A new electrochemical synthesis route was developed for the fabrication of Fe-containing layered double hydroxide (MFe-LDHs, M = Ni, Co and Li) hierarchical nanoarrays, which exhibit highly-efficient electrocatalytic performances for the oxidation reactions of several small molecules (water, hydrazine, methanol and ethanol). Ultrathin MFe-LDH nanoplatelets (200–300 nm in lateral length; 8–12 nm in thickness) perpendicular to the substrate surface are directly prepared within hundreds of seconds (<300 s) under cathodic potential. The as-obtained NiFe-LDH nanoplatelet arrays display promising behavior in the oxygen evolution reaction (OER), giving rise to a rather low overpotential (0.224 V) at 10.0 mA cm–2 with largely enhanced stability, much superior to previously reported electro-oxidation catalysts as well as the state-of-the-art Ir/C catalyst. Furthermore, the MFe-LDH nanoplatelet arrays can also efficiently catalyze several other fuel molecules’ oxidation (e.g., hydrazine, methanol and ethanol), delivering a satisfactory electrocatalytic activity and a high operation stability. In particular, this preparation method of Fe-containing LDHs is amenable to fast, effective and large-scale production, and shows promising applications in water splitting, fuel cells and other clean energy devices.
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