Rational construction of strongly coupled metal-metal oxide-graphene nanostructure with excellent electrocatalytic activity and durability.
Rational construction of strongly coupled metal-metal oxide-graphene nanostructure with excellent electrocatalytic activity and durability.
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DOI：
10.1021/am5016606
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发表时间：
2014-06
影响因子：
9.5
通讯作者：
Haoliang Huang;Yingju Liu;Qiongzhi Gao;Weishuo Ruan;Xiao-Tan Lin;Xin Li
中科院分区：
文献类型：
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作者：
Haoliang Huang;Yingju Liu;Qiongzhi Gao;Weishuo Ruan;Xiao-Tan Lin;Xin Li
异质纳米结构内的相互作用可以提供一个很好的机会，从根本上提高其电催化性能，并增加其活性和耐久性。在这里，一个合理的，简单的，和集成的策略，以构建均匀的和强耦合的金属-金属氧化物-石墨烯纳米结构作为高性能的电催化剂。我们首先简单地合成了相互作用的SnO 2-prGO（保护和还原的氧化石墨烯）杂化物，其中SnO 2纳米颗粒（约4 nm）使用原位氧化还原和水解反应选择性地锚定在rGO的含氧缺陷上。在Pt的沉积之后，发现均匀的Pt NP与SnO 2-prGO混合物中的SnO 2相紧密且排他地接触。这种构造的纳米结构（Pt-SnO 2-prGO）表现出显着改善的电催化活性（2.19倍）和耐久性（2.08倍）对甲醇氧化的最先进的Pt/C催化剂。讨论了SnO 2和石墨烯之间以及Pt和SnO 2之间的强耦合的详细解释，揭示了这样的过程可以用于在金属氧化物修饰的催化剂上包覆各种金属催化剂，以实现具有增强性能的先进催化体系。
The interaction within heterogeneous nanostructures can provide a great opportunity to radically enhance their electrocatalytic properties and increase their activity and durability. Here a rational, simple, and integrated strategy is reported to construct uniform and strongly coupled metal-metal oxide-graphene nanostructure as an electrocatalyst with high performance. We first simply synthesized the interacted SnO2-prGO (protected and reduced graphene oxide) hybrid with SnO2 nanoparticles (∼4 nm) selectively anchored on the oxygenated defects of rGO using an in situ redox and hydrolysis reaction. After the deposition of Pt, uniform Pt NPs are found to contact intimately and exclusively with the SnO2 phase in the SnO2-prGO hybrid. This constructed nanostructure (Pt-SnO2-prGO) exhibits significantly improved electrocatalytic activity (2.19-fold) and durability (2.08-fold) toward methanol oxidation over that of the state-of-the-art Pt/C catalyst. The detailed explanation of the strong coupling between SnO2 and graphene as well as between Pt and SnO2 is discussed, revealing that such a process can be used to immobilize various metal catalysts on metal-oxide-decorated catalysts for realizing advanced catalytic systems with enhanced performance.