Facile Synthesis of Co3O4 with Different Morphologies via Oxidation Kinetic Control and Its Application in Hydrogen Peroxide Decomposition
Facile Synthesis of Co3O4 with Different Morphologies via Oxidation Kinetic Control and Its Application in Hydrogen Peroxide Decomposition
复制标题
通过氧化动力学控制轻松合成不同形貌的Co3O4及其在过氧化氢分解中的应用
DOI：
10.1021/acs.cgd.6b00841
复制
发表时间：
2016-11-01
影响因子：
3.8
通讯作者：
Chen, Guangwen
中科院分区：
文献类型：
--
作者：
Chen, Huihui;Yang, Mei;Chen, Guangwen
通过CoOOH的形成和随后在空气中的高温煅烧，成功地合成了具有管状和中空结构的Co 3 O 4纳米颗粒（NPs）。合成的Co 3 O 4保留了CoOOH的形貌。因此，Co 3 O 4合成的关键步骤是具有管状和中空结构的CoOOH NPs的可控制备，其通过涉及在强碱性条件（无模板、水溶液和温和温度）下氧化β-Co（OH）（2）的简单策略制备。采用空气和H_2O_2作为氧化剂，对CoOOH的形貌进行了调整，这两种氧化剂具有不同的氧化能力，从而导致不同的氧化动力学。具有管状和中空结构的CoOOH纳米颗粒的合理形成机制都与Kirkendall效应有关。与市售Co 3 O 4相比，所制备的具有管状和中空结构的Co 3 O 4纳米粒子对H2 O2的分解具有上级催化活性。所制备的具有管状和中空结构的Co 3 O 4纳米粒子的反应速率常数是商业纳米粒子的100倍以上。
Co3O4 nanoparticles (NPs) with tubular and hollow structures were successfully synthesized by the formation of CoOOH and subsequent high-temperature calcination in air. The as-synthesized Co3O4 retained the morphologies of CoOOH. Therefore, the key step for the synthesis of Co3O4 was the controllable preparation of CoOOH NPs with tubular and hollow structures, which were prepared through a facile strategy involving the oxidation of beta-Co(OH)(2) under strong basic conditions (template-free, aqueous solution, and mild temperature). The morphology of CoOOH was tuned by employing air and H2O2 as the oxidizing agents which possessed different oxidation abilities and thus resulted in different oxidation kinetics. The plausible formation mechanism of CoOOH NPs with tubular and hollow structures was both related to the Kirkendall effect. In contrast to the commercial Co3O4, the as-prepared Co3O4 NPs with tubular and hollow structures showed superior catalytic activities for the decomposition of H2O2. The reaction rate constants of the as-prepared Co3O4 NPs with tubular and hollow structures were over 100 times the value of the commercial one.