Ultrathin Spinel-Structured Nanosheets Rich in Oxygen Deficiencies for Enhanced Electrocatalytic Water Oxidation
Ultrathin Spinel-Structured Nanosheets Rich in Oxygen Deficiencies for Enhanced Electrocatalytic Water Oxidation
复制标题
富含缺氧的超薄尖晶石结构纳米片，用于增强电催化水氧化
DOI：
10.1002/anie.201502226
复制
发表时间：
2015-06-15
影响因子：
16.6
通讯作者：
Xie, Yi
中科院分区：
文献类型：
--
作者：
Bao, Jian;Zhang, Xiaodong;Xie, Yi
电化学水裂解是一种清洁的氢燃料技术，但由于析氧反应（OER）动力学缓慢，极大地阻碍了电化学水裂解。在此，一系列的尖晶石结构的纳米片的氧缺陷和厚度的设计，以增加的反应性和催化剂的活性位点的数量，然后作为一个很好的平台，促进水的氧化过程。理论研究表明，氧空位限制在纳米片可以降低水的吸附能，导致OER效率增加。正如预期的那样，富含氧空位的NiCo_2O_4纳米片在0.8V下表现出285 mAcm（-2）的大电流密度和0.32 V的小过电位，这两个值都上级本体样品或几乎没有氧缺陷的样品的相应值，甚至高于大多数已报道的非贵金属催化剂的相应值。本工作为新型OER催化剂的设计提供了一条新的途径。
Electrochemical water splitting is a clean technology for H-2 fuels, but greatly hindered by the slow kinetics of the oxygen evolution reaction (OER). Herein, a series of spinel-structured nanosheets with oxygen deficiencies and ultrathin thicknesses were designed to increase the reactivity and the number of active sites of the catalysts, which were then taken as an excellent platform for promoting the water oxidation process. Theoretical investigations showed that the oxygen vacancies confined in the ultrathin nanosheet could lower the adsorption energy of H2O, leading to increased OER efficiency. As expected, the NiCo2O4 ultrathin nanosheets rich in oxygen vacancies exhibited a large current density of 285 mAcm(-2) at 0.8V and a small overpotential of 0.32 V, both of which are superior to the corresponding values of bulk samples or samples with few oxygen deficiencies and even higher than those of most reported non-precious-metal catalysts. This work should provide a new pathway for the design of advanced OER catalysts.