N-doped carbon sheets supported P-Fe3O4-MoO2 for freshwater and seawater electrolysis

Xuehong Wang; Guangrui Liu; Di Zhang; Shuo Han; Jie Yin; Jiatong Jiang; Wenpin Wang; Zhongcheng Li

doi:10.1016/j.jcis.2023.08.141

N-doped carbon sheets supported P-Fe₃O₄-MoO₂ for freshwater and seawater electrolysis

J Colloid Interface Sci. 2023 Dec 15;652(Pt B):1217-1227. doi: 10.1016/j.jcis.2023.08.141. Epub 2023 Aug 23.

Authors

Xuehong Wang¹, Guangrui Liu¹, Di Zhang¹, Shuo Han¹, Jie Yin², Jiatong Jiang¹, Wenpin Wang³, Zhongcheng Li⁴

Affiliations

¹ Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
² College of Materials Science and Engineering, School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage, Liaocheng University, Liaocheng 252059, China.
³ Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address: [email protected].
⁴ Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China. Electronic address: [email protected].

PMID: 37657221
DOI: 10.1016/j.jcis.2023.08.141

Abstract

Electric-driven freshwater/seawater splitting is an attractive and sustainable route to realize the generation of H₂ and O₂. Molybdenum-based oxides exhibit poor activity toward freshwater/seawater electrolysis. Herein, we adjusted the electronic structure of MoO₂ by constructing N-doped carbon sheets supported P-Fe₃O₄-MoO₂ nanosheets (P-Fe₃O₄-MoO₂/NC). P-Fe₃O₄-MoO₂/N-doped carbon sheets were precisely prepared by pyrolysis of Schiff base Fe complex and MoO₃ nanosheets through phosphorization. Benefiting from the unique structures of the samples, it required 119/145 mV to drive freshwater/seawater reduction reaction at 10 mA/cm². P-Fe₃O₄-MoO₂/NC catalysts exhibited superior freshwater/seawater oxidation reactivity with 180/189 mV at 10 mA/cm² compared with commercial RuO₂. The low cell voltages for P-Fe₃O₄-MoO₂/NC were 1.47 and 1.59 V towards freshwater and seawater electrolysis, respectively. Our work might shed light on the structural modulation of Mo-based oxides for enhancing freshwater and seawater electrolysis activity.

Keywords: Freshwater electrolysis; Interface structure; N-doped carbon; P-Fe(3)O(4)-MoO(2); Seawater electrolysis.