N掺杂FeNi催化剂提升Fe2O3光阳极析氧活性
N-doped FeNi Cocatalysts for Enhancing the OER Activity in Fe2O3 Photoanodes
罗亿 1毕迎普2
作者信息
- 1. 中国科学院兰州化学物理研究所 羰基合成与选择氧化国家重点实验室,甘肃 兰州 730000;中国科学院大学,北京 100049
- 2. 中国科学院兰州化学物理研究所 羰基合成与选择氧化国家重点实验室,甘肃 兰州 730000
- 折叠
摘要
光电催化分解水技术可将太阳能直接转化为清洁、可储存的氢能源,然而目前光阳极普遍存在析氧动力学缓慢、光生载流子复合快等问题导致太阳能分解水转换效率较低.我们在Fe2O3 纳米棒光阳极表面修饰N掺杂FeNi催化剂(Fe2O3-FNNO),在 1.23 V时光电流密度达到 2.5 mA·cm-2(AM 1.5G,100 mW·cm-2),相比未修饰Fe2O3 光阳极性能提升 2.5倍(1.0 mA·cm-2).进一步研究表明,FeNi催化剂与Fe2O3 之间的N-O界面键合能够有效促进光生电子-空穴高效分离与转移,光生空穴快速转移至FeNi催化剂表面活性位,从而大幅度提高析氧催化活性与稳定性.该研究工作为构筑高效稳定的Fe2O3 光阳极提供了新的研究思路.
Abstract
Photoelectrochemical(PEC)catalysis has been perceived as a promising approach in the water splitting,utilizing the drive of sunlight to yield evironmentally and storable hydrogen energy.However,the photoanodes were restricted in sluggish water oxidation kinetics and high charge recombination,resulting in low energy conversion.Herein,we demonstrated the N-doped FeNi cocatalysts over the surface of pristine Fe2O3 photoanodes(Fe2O3-FNNO),whose photocurrent density could reach to 2.5 mA·cm-2 at 1.23 V vs.RHE(reversible hydrogen electrode,AM 1.5G).Further experimental and characterization studies reveal that the reduction properties of NH3 and formation of N―O bond could enhance the ratio of Fe2+and Ni3+in FeNi cocatalysts to offer more active sites in the PEC water splitting.Thus,this work provides a potential and promising route to developing high-performance Fe2O3 photoanodes.
关键词
太阳能/Fe2O3光阳极/N掺杂/FeNi催化剂/水氧化Key words
solar energy/Fe2O3 photoanodes/N-doped/FeNi cocatalyst/water oxidation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据