中国物理B ›› 2022, Vol. 31 ›› Issue (11): 118201-118201.doi: 10.1088/1674-1056/ac70b1

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Accelerated oxygen evolution kinetics on Ir-doped SrTiO3 perovskite by NH3 plasma treatment

Li-Li Deng(邓丽丽), Xiao-Ping Ma(马晓萍), Man-Ting Lu(卢曼婷), Yi He(何弈), Rong-Lei Fan(范荣磊), and Yu Xin(辛煜)   

  1. School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, China
  • 收稿日期:2022-01-07 修回日期:2022-04-30 接受日期:2022-05-18 出版日期:2022-10-17 发布日期:2022-11-01
  • 通讯作者: Rong-Lei Fan, Yu Xin E-mail:rlfan@suda.edu.cn;yuxin@suda.edu.cn
  • 基金资助:
    Project supported by the Priority Academic Program Development (PAPD) Program of Jiangsu Higher Education Institutions, Jiangsu Province, China and the National Natural Science Foundation of China (Grant No. 11675117).

Accelerated oxygen evolution kinetics on Ir-doped SrTiO3 perovskite by NH3 plasma treatment

Li-Li Deng(邓丽丽), Xiao-Ping Ma(马晓萍), Man-Ting Lu(卢曼婷), Yi He(何弈), Rong-Lei Fan(范荣磊), and Yu Xin(辛煜)   

  1. School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, China
  • Received:2022-01-07 Revised:2022-04-30 Accepted:2022-05-18 Online:2022-10-17 Published:2022-11-01
  • Contact: Rong-Lei Fan, Yu Xin E-mail:rlfan@suda.edu.cn;yuxin@suda.edu.cn
  • Supported by:
    Project supported by the Priority Academic Program Development (PAPD) Program of Jiangsu Higher Education Institutions, Jiangsu Province, China and the National Natural Science Foundation of China (Grant No. 11675117).

摘要: Exploring low-cost and high-performance catalysts for oxygen evolution reaction (OER) remains to be a great challenge. Iridium-based perovskite oxide has large potential in OER because of its intrinsic activity and outstanding physicochemical properties. In this study, iridium-doped strontium titanate (Ir-STO) solution is brushed on a Ti sheet by the traditional method to obtain the Ir-STO/Ti electrodes after being calcined at a high temperature. The microstructure and electrocatalysis properties of the Ir-STO are further modified by a facile and scalable NH3-plasma strategy. In addition to the doping of Ir, the NH3 plasma treatment further results in N-doping into Ir-STO, which enriches active species and causes oxygen vacancies near doped sites. The resulting N, Ir-STO/Ti electrode reveals excellent acidic OER activity with the lowest overpotential of 390 mV at 10 mA/cm2 and the smallest Tafel slope of 140 mV/dec after 10-min plasma treatment. Therefore, the great potential of activated N, Ir-STO/Ti is regarded as a catalyst for the OER, and thus making a new opportunity for developing other perovskite catalysts via NH3 plasma treatment.

关键词: electrocatalysts, NH3 plasma, oxygen vacancies, N doping

Abstract: Exploring low-cost and high-performance catalysts for oxygen evolution reaction (OER) remains to be a great challenge. Iridium-based perovskite oxide has large potential in OER because of its intrinsic activity and outstanding physicochemical properties. In this study, iridium-doped strontium titanate (Ir-STO) solution is brushed on a Ti sheet by the traditional method to obtain the Ir-STO/Ti electrodes after being calcined at a high temperature. The microstructure and electrocatalysis properties of the Ir-STO are further modified by a facile and scalable NH3-plasma strategy. In addition to the doping of Ir, the NH3 plasma treatment further results in N-doping into Ir-STO, which enriches active species and causes oxygen vacancies near doped sites. The resulting N, Ir-STO/Ti electrode reveals excellent acidic OER activity with the lowest overpotential of 390 mV at 10 mA/cm2 and the smallest Tafel slope of 140 mV/dec after 10-min plasma treatment. Therefore, the great potential of activated N, Ir-STO/Ti is regarded as a catalyst for the OER, and thus making a new opportunity for developing other perovskite catalysts via NH3 plasma treatment.

Key words: electrocatalysts, NH3 plasma, oxygen vacancies, N doping

中图分类号:  (Electrolysis)

  • 82.45.Hk
82.45.Jn (Surface structure, reactivity and catalysis) 52.77.Dq (Plasma-based ion implantation and deposition) 74.62.Dh (Effects of crystal defects, doping and substitution)