A highly active and stable IrOx/SrIrO3 catalyst for the oxygen evolution reaction
A highly active and stable IrOx/SrIrO3 catalyst for the oxygen evolution reaction
复制标题
DOI：
10.1126/science.aaf5050
复制
发表时间：
2016-09-02
期刊：
影响因子：
56.9
通讯作者：
Jaramillo, Thomas F.
中科院分区：
文献类型：
--
作者：
Seitz, Linsey C.;Dickens, Colin F.;Jaramillo, Thomas F.
氧电化学在燃料电池和电解槽等可再生能源技术中发挥着关键作用，但析氧反应（OER）的缓慢动力学限制了此类设备的性能和商业化。在这里，我们报告的氧化铱/氧化锶铱（IrOx/SrIrO 3）催化剂在电化学测试过程中形成的SrIrO 3薄膜的表面层的锶浸出。该催化剂已证明在10毫安/平方厘米氧化物催化剂下的比活性（OER电流归一化为催化剂表面积），在酸性电解质中连续测试30小时的过电位仅为270至290毫伏。密度泛函理论计算表明，形成高活性的表面层，在锶浸出与IrO 3或IrO 2图案。IrOx/SrIrO 3催化剂优于已知的IrOx和氧化铱（RuOx）体系，这是仅有的在酸性电解质中具有合理活性的其它OER催化剂。
Oxygen electrochemistry plays a key role in renewable energy technologies such as fuel cells and electrolyzers, but the slow kinetics of the oxygen evolution reaction (OER) limit the performance and commercialization of such devices. Here we report an iridium oxide/strontium iridium oxide (IrOx/SrIrO3) catalyst formed during electrochemical testing by strontium leaching from surface layers of thin films of SrIrO3. This catalyst has demonstrated specific activity at 10 milliamps per square centimeter of oxide catalyst (OER current normalized to catalyst surface area), with only 270 to 290 millivolts of overpotential for 30 hours of continuous testing in acidic electrolyte. Density functional theory calculations suggest the formation of highly active surface layers during strontium leaching with IrO3 or anatase IrO2 motifs. The IrOx/SrIrO3 catalyst outperforms known IrOx and rutheniumoxide (RuOx) systems, the only other OER catalysts that have reasonable activity in acidic electrolyte.