Defective titanium dioxide single crystals exposed by high-energy {001} facets for efficient oxygen reduction.
Defective titanium dioxide single crystals exposed by high-energy {001} facets for efficient oxygen reduction.
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DOI：
10.1038/ncomms9696
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发表时间：
2015-10-23
影响因子：
16.6
通讯作者：
Yu HQ
中科院分区：
文献类型：
--
作者：
Pei DN;Gong L;Zhang AY;Zhang X;Chen JJ;Mu Y;Yu HQ
阴极材料在能量转换和储存系统的氧还原反应中起着至关重要的作用。二氧化钛作为一种半导体材料，由于其低导电性和差的反应活性，通常不被认为是一种有效的氧还原电催化剂。在这里，我们证明，纳米结构的二氧化钛，自掺杂的氧空位和选择性暴露的高能量{001}方面，表现出令人惊讶的竞争力的氧还原活性，优异的耐久性和上级耐受甲醇。结合电化学测试与密度泛函计算，我们阐明了以缺陷为中心的氧还原反应机制的还原{001}-TiO 2 −x纳米晶体的优越性。我们的研究结果可能提供一个机会，开发一个简单的，高效的，成本效益和有前途的催化剂的氧还原反应的能量转换和存储技术。 二氧化钛通常不被认为是有效的氧还原催化剂。在这里，作者表明，纳米结构的二氧化钛，自掺杂氧空位和暴露的高能{001}面，表现出竞争性的氧还原催化活性和耐久性。
The cathodic material plays an essential role in oxygen reduction reaction for energy conversion and storage systems. Titanium dioxide, as a semiconductor material, is usually not recognized as an efficient oxygen reduction electrocatalyst owning to its low conductivity and poor reactivity. Here we demonstrate that nano-structured titanium dioxide, self-doped by oxygen vacancies and selectively exposed with the high-energy {001} facets, exhibits a surprisingly competitive oxygen reduction activity, excellent durability and superior tolerance to methanol. Combining the electrochemical tests with density-functional calculations, we elucidate the defect-centred oxygen reduction reaction mechanism for the superiority of the reductive {001}-TiO2−x nanocrystals. Our findings may provide an opportunity to develop a simple, efficient, cost-effective and promising catalyst for oxygen reduction reaction in energy conversion and storage technologies. Titanium dioxide is not generally considered to be an effective oxygen reduction catalyst. Here, the authors show that nanostructured titanium dioxide, self-doped with oxygen vacancies and with exposed high-energy {001} facets, exhibits competitive oxygen reduction catalytic activity and durability.