Efficient noble metal-free (electro)catalysis of water and alcohol oxidations by zinc-cobalt layered double hydroxide.
Efficient noble metal-free (electro)catalysis of water and alcohol oxidations by zinc-cobalt layered double hydroxide.
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DOI：
10.1021/ja407174u
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发表时间：
2013-11
影响因子：
15
通讯作者：
Xiaoxin Zou;A. Goswami;Tewodros Asefa
中科院分区：
文献类型：
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作者：
Xiaoxin Zou;A. Goswami;Tewodros Asefa
用廉价和地球资源丰富的催化剂取代稀有和昂贵的贵金属催化剂，用于各种可再生能源相关的化学过程以及高价值化学品的生产，是可持续化学的主要目标之一。本文中，我们表明，Zn-Co-LDH（Zn-Co-LDH）可以作为一个有效的电催化剂和催化剂，水和醇的氧化，分别。在电化学水氧化中，该材料表现出比基于钴的固态材料（例如，Co（OH）2和Co 3 O 4）-催化体系，最近报道对该反应有效。此外，在相同的外加电位下，该材料的每Co原子的翻转频率（TOF）是后者的10倍以上。Zn-Co-LDH还可以在较低的温度下催化醇氧化为相应的醛或酮，具有中到高的转化率和优异的选择性。
Replacing rare and expensive noble metal catalysts with inexpensive and earth-abundant ones for various renewable energy-related chemical processes as well as for production of high value chemicals is one of the major goals of sustainable chemistry. Herein we show that a bimetallic Zn-Co layered double hydroxide (Zn-Co-LDH) can serve as an efficient electrocatalyst and catalyst for water and alcohol oxidation, respectively. In the electrochemical water oxidation, the material exhibits a lower overpotential, by ~100 mV, than monometallic Co-based solid-state materials (e.g., Co(OH)2 and Co3O4)-catalytic systems that were recently reported to be effective for this reaction. Moreover, the material's turnover frequency (TOF) per Co atoms is >10 times as high as those of the latter at the same applied potentials. The Zn-Co-LDH also catalyzes oxidation of alcohols to the corresponding aldehydes or ketones at relatively low temperature, with moderate to high conversion and excellent selectivity.