3D interconnected nanoporous TaN films for photoelectrochemical water splitting: thickness-controlled synthesis and insights into stability

作     者：Qiang Wang Lingxia Zhang Bing Li Hongmin Zhu Jianlin Shi 王强;张玲霞;李冰;朱鸿民;施剑林

作者机构：Department of MetallurgyGraduate School of EngineeringTohoku UniversitySendai 980-8579Japan School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Lab of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Chemistry and Materials ScienceHangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China 

基　　金：financially supported by the National Natural Science Foundation of China (51774145,51872317 and 21835007) China Postdoctoral Science Foundation (2019M661644) China Scholarship Council (CSC) for financial support 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2021年第64卷第8期

页      码：1876-1888页

摘      要：Solar-driven photoelectrochemical(PEC) water splitting is a promising technology for sustainable hydrogen production, which relies on the development of efficient and stable photoanodes for water oxidation reaction. The thickness and microstructure of semiconductor films are generally crucial to their PEC properties. Herein, three-dimensional(3D) interconnected nanoporous Ta3N5 film photoanodes with controlled thickness were successfully fabricated via galvanostatic anodization and NH3 nitridation. The porous Ta3N5 nanoarchitectures(NAs) of 900 nm in thickness showed the highest PEC performance due to the optimal lightharvesting and charge separation. Compared with the holeinduced photocorrosion, the electrochemical oxidation at high anodic potentials resulted in severer performance degradation of Ta3N5. Although the surface oxide layer on deteriorated Ta3N5 photoanodes could be removed by NH3 re-treatment,the PEC performance was only partially recovered. As an alternative, anchoring a dual-layer Co(OH)x/Co OOH co-catalyst shell on the porous Ta3N5 NAs demonstrated substantially enhanced PEC performance and stability. Overall, this work provides reference to controllably fabricate 3D nanoporous Ta3N5-based photoanodes for efficient and stable PEC water splitting via optimizing the light absorption, hole extraction,charge separation and utilization.

主 题 词：Ta3N5 3D interconnected porous nanoarchitectures thickness-controlled synthesis photoelectrochemical water splitting photostability 

学科分类：07[理学] 08[工学] 070205[070205] 080501[080501] 0805[工学-能源动力学] 080502[080502] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1007/s40843-020-1584-6

馆 藏 号：203102164...