Immobilization of Ir(OH)3 Nanoparticles in Mesospaces of Al-SiO2 Nanoparticles Assembly to Enhance Stability for Photocatalytic Water Oxidation
Immobilization of Ir(OH)3 Nanoparticles in Mesospaces of Al-SiO2 Nanoparticles Assembly to Enhance Stability for Photocatalytic Water Oxidation
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DOI：
10.3390/catal10091015
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发表时间：
2020-09
期刊：
影响因子：
3.9
通讯作者：
Gentaro Sakamoto;H. Tabe;Yusuke Yamada
中科院分区：
文献类型：
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作者：
Gentaro Sakamoto;H. Tabe;Yusuke Yamada
氢氧化铱（Ir（OH）3）纳米粒子表现出高催化活性的水的氧化被固定在介孔内的二氧化硅纳米粒子组件（SiO2 NPA），以抑制由于团聚的催化失活。固定在SiO2 NPA中的Ir（OH）3纳米颗粒（Ir（OH）3/SiO2 NPA）通过可见光照射分别含有过硫酸根离子（S2 O 82-）和三（2，2 ′-联吡啶）钌（II）离子（[RuII（bpy）3]2+）作为牺牲电子受体和光敏剂的溶液来催化水氧化。使用通过共积累法制备的Ir（OH）3/SiO2 NPA，在4次重复运行中，基于S2 O 82-的使用量的氧（O2）产率保持在80%以上，尽管在相同的反应条件下，使用通过平衡吸附法制备的Ir（OH）3/SiO2 NPA或不含SiO2 NPA载体的Ir（OH）3纳米颗粒的反应体系的产率降低。将Ir（OH）3纳米颗粒固定在Al 3+掺杂的SiO2 NPA（Al-SiO2 NPA）中，进一步提高了催化剂的稳定性，在重复实验的第四轮中，产率超过95%。
Iridium hydroxide (Ir(OH)3) nanoparticles exhibiting high catalytic activity for water oxidation were immobilized inside mesospaces of a silica-nanoparticles assembly (SiO2NPA) to suppress catalytic deactivation due to agglomeration. The Ir(OH)3 nanoparticles immobilized in SiO2NPA (Ir(OH)3/SiO2NPA) catalyzed water oxidation by visible light irradiation of a solution containing persulfate ion (S2O82−) and tris(2,2′-bipyridine)ruthenium(II) ion ([RuII(bpy)3]2+) as a sacrificial electron acceptor and a photosensitizer, respectively. The yield of oxygen (O2) based on the used amount of S2O82− was maintained over 80% for four repetitive runs using Ir(OH)3/SiO2NPA prepared by the co-accumulation method, although the yield decreased for the reaction system using Ir(OH)3/SiO2NPA prepared by the equilibrium adsorption method or Ir(OH)3 nanoparticles without SiO2NPA support under the same reaction conditions. Immobilization of Ir(OH)3 nanoparticles in Al3+-doped SiO2NPA (Al-SiO2NPA) results in further enhancement of the catalytic stability with the yield of more than 95% at the fourth run of the repetitive experiments.