材料科学
化学链燃烧
三元运算
尖晶石
制氢
氧气
氢
化学工程
冶金
化学
计算机科学
工程类
有机化学
程序设计语言
作者
Dewang Zeng,Yu Qiu,Min Li,Dongxu Cui,Li Ma,Yulin Lv,Shuai Zhang,Rui Xiao
标识
DOI:10.1021/acsami.9b14989
摘要
Operating chemical looping at moderate temperatures circumvents the issue that the sintering of oxygen carrier materials is serious at typical operating conditions, 800-950 °C. However, lower temperatures can lead to deterioration on the reaction kinetics and thereby the low H2 production rate and yield. Here, we present several doped spinel oxides consisting of earth-abundant elements for chemical looping water splitting. By virtue of the ability of the Cu dopant to improve the reduction of the Co-based binary spinel, the high reducibility of the dopants in the reduction period, as well as the phase reversibility in the water splitting period, Cu0.25Co0.25Fe2.5Oy shows a high hydrogen yield (∼11.9 mmol g-1) and an average hydrogen production rate (∼137.7 μmol g-1 min-1) at 550 °C, with negligible decays in repetitive redox cycles. The performance of this material is comparable to that of the state-of-the-art perovskites which usually contain rare-earth metals, enabling its potential in industrial implementation.
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