J. Mater. Sci. Technol. ›› 2025, Vol. 204: 268-275.DOI: 10.1016/j.jmst.2024.03.058

• Research Article • Previous Articles     Next Articles

Sulfur poisoned PtNi/C catalysts toward two-electron oxygen reduction reaction for acidic electrosynthesis of hydrogen peroxide

Xin Yanga, Lijie Zhonga,*, Songxin Yea, Dequan Hea, Shuxian Yuana, Huixin Lia, Yuting Maa, Xiaocheng Moa, Shiyu Gana, Li Niua,b,*   

  1. aCenter for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials & devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & devices, Key Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial Universities, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;
    bSchool of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China
  • Received:2024-01-16 Revised:2024-03-21 Accepted:2024-03-22 Published:2025-01-01 Online:2024-04-27
  • Contact: *E-mail addresses: ccljzhong@gzhu.edu.cn (L. Zhong), lniu@gzhu.edu.cn (L. Niu).

Abstract: Selective electrocatalysis of two-electron oxygen reduction reaction (2e- ORR) has been recognized as a sustainable and on-site process for hydrogen peroxide (H2O2) production. Great progress has been achieved for 2e- ORR in alkaline media. However, it is challenged by insufficient activity and selectivity of the catalysts in acidic electrolytes. Herein, we report sulfur-poisoned PtNi/C catalysts (PtNiSx/C) that could regulate ORR from the 4e- to 2e- pathway. The identified PtNiS0.6/C offers high activity in terms of onset potential of ∼0.69 V (vs. RHE) and ∼80 % selectivity. The mass activity is also comparable and outperforms representative Pt-based precious and transition-metal-based catalysts. In addition, it is interestingly found that the Faradaic efficiency further increased to 95 % during the long-term electrolysis test due to Ni atom surface migration. The electrochemical production of the H2O2 system was applied to the electro-Fenton process, which has realized the effective degradation of organic pollutants. This work offers a strategy by sulfur poisoning PtNi/C catalyst to realize Pt-based 2e- ORR active catalysts to electrolysis of H2O2 in acidic media.

Key words: Oxygen reduction reaction, Hydrogen peroxide, Acidic media, Electrocatalysis