Atomic-scale topochemical preparation of crystalline Fe3+-doped beta-Ni(OH)(2) for an ultrahighrate oxygen evolution reaction

作者：Zhu, Kaiyue; Liu, Huanying; Li, Mingrun; Li, Xuning; Wang, Junhu; Zhu, Xuefeng^*; Yang, Weishen

来源：Journal of Materials Chemistry A, 2017, 5(17): 7753-7758.

DOI：10.1039/c7ta01408b

• LAYERED DOUBLE HYDROXIDE
• WATER OXIDATION
• MOSSBAUER-SPECTROSCOPY
• PHASE-TRANSFORMATION
• NICKEL HYDROXIDES
• AIR BATTERIES
• NIFE
• ELECTROCATALYSTS
• FILM
• EFFICIENT

The development of highly efficient and affordable electrocatalysts for the sluggish oxygen evolution reaction (OER) has been considered as a great challenge to the practical applications for water splitting and in rechargeable metal-air batteries. Herein, we report active and robust OER catalysts of Fe3+-doped beta-Ni(OH)(2) prepared via an atomic-scale topochemical transformation route. Based on the premise that all Fe3+ is incorporated into the beta-Ni(OH)(2) lattice, the OER activity increases directly with the content of Fe3+. The Fe(0.5)-doped beta-Ni(OH)(2) catalyst affords a current density of 10 mA cm(-2) at an overpotential as low as 0.26 V and a small Tafel slope of 32 mv dec(-1). Comparing the state-of-the-art IrO2 catalyst, the Fe(0.5)-doped beta-Ni(OH)(2) catalyst exhibits higher activity and stability from galvanostatic tests at 10 mA cm(-2). Additionally, we experimentally demonstrate that Fe(0.5)-doped beta-Ni(OH)(2) exerts higher OER activity than Fe(0.5)-doped alpha-Ni(OH)(2). All evidence indicates that Fe and the beta-Ni(OH)(2) matrix play an important role in NiFe-based catalysts.

• 出版日期2017-5-7
• 单位中国科学院大学; 催化基础国家重点实验室; 中国科学院大连化学物理研究所