Modifying Ti-Based Gas Diffusion Layer Passivation for Polymer Electrolyte Membrane Water Electrolysis via Electrochemical Nitridation

Yue Liu; Shaobo Huang; Dongdong Wang; Heng Zhang; Dongfang Shan; Shanlong Peng; Guixin Shen; Lifan Wang; Xindong Wang

doi:10.1021/acsami.1c22639

Modifying Ti-Based Gas Diffusion Layer Passivation for Polymer Electrolyte Membrane Water Electrolysis via Electrochemical Nitridation

ACS Appl Mater Interfaces. 2022 Apr 6;14(13):15728-15735. doi: 10.1021/acsami.1c22639. Epub 2022 Mar 25.

Authors

Yue Liu^{1

2}, Shaobo Huang³, Dongdong Wang^{1

2}, Heng Zhang^{1

2}, Dongfang Shan^{1

2}, Shanlong Peng^{1

2}, Guixin Shen^{1

2}, Lifan Wang^{1

2}, Xindong Wang^{1

2}

Affiliations

¹ School of Metallurgical and Ecological Engineering, University of Science and Technology, 30 College Road, Beijing 100083, China.
² State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, No. 30 College Road, Haidian District, Beijing 100083, China.
³ Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.

PMID: 35333508
DOI: 10.1021/acsami.1c22639

Abstract

A gas diffusion layer represents an important element of collector and stack components used in polymer electrolyte membrane (PEM) water electrolyzers (WE). Nowadays, titanium-based gas diffusion layers (GDLs) have high stability and are frequently employed as anode GDLs, yet reliability issues emerging from passivation have limited their practical deployment. Hence, we develop an inexpensive way of producing high conductivity and corrosion resistance of Ti-based GDLs through electrochemical nitridation. The morphology and content of the nitride phase on the surface of the Ti felt GDL are efficiently regulated by adjusting reduction potential and reaction time. According to X-ray photoelectron spectroscopy studies, the modified Ti felt is coated with ammonium ions and nitrogen-incorporated oxides, namely, TiN/TiO_x, on the surface. The nitride surface shows a low interfacial contact resistance (ca. 1.0 mΩ cm² at 140 N/cm²) and excellent corrosion resistance (0.920 μA cm^-2) in the simulated PEM WE environments. The electrochemical nitridation provides an economic way to introducing N layers on the surface of the Ti-based GDL with high performance, which is very promising for efficient PEM water electrolysis.

Keywords: PEM water electrolysis; electrochemical nitridation; gas diffusion layer; surface modification; titanium passivation.