Proton-exchange membrane water electrolysis (PEM WE) is a particularly promising technology for renewable hydrogen produc-tion. However, the excessive passivation of the gas diffusion layer (GDL) will seriously affect the high surface-contact resistance and result in energy losses. Thus, a mechanism for improving the conductivity and interface stability of the GDL is an urgent issue. In this work, we have prepared a hydrophilic and corrosion resistant conductive composite protective coating. The polydopamine (PDA) film on the Ti surface, which was obtained via the solution oxidation method, ensured that neither micropores nor pinholes existed in the final hybrid coatings. In-situ reduced gold nanoparticles (AuNPs) improved the conductivity to achieve the desired interfacial contact resistance and further enhanced the corrosion resistance. The surface composition of the treated samples was investigated using scanning electron microscopy (SEM), transmis-sion electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results indicated that the optimized reaction conditions included a pH value of 3 of HAuCl4 solution with PDA deposition (48 h) on papers and revealed the lowest con-tact resistance (0.5 mΩ·cm2) and corrosion resistance (0.001 μA·cm?2) in a 0.5 M H2SO4 + 2 ppm F? solution (1.7 V vs. RHE) among all the modified specimens, where RHE represents reversible hydrogen electrode. These findings indicated that the Au–PDA coating is very appropri-ate for the modification of Ti GDLs in PEM WE systems.

Yue Liu;Shaobo Huang;Shanlong Peng;Heng Zhang;Lifan Wang;Xindong Wang

State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Department of Energy Storage Science and Engineering,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Physics and Engineering,Henan University of Science and Technology,Luoyang 471023,China

矿物冶金与材料学报

[1]Yue Liu;Shaobo Huang;Shanlong Peng;Heng Zhang;Lifan Wang;Xindong Wang-.Novel Au nanoparticles-inlaid titanium paper for PEM water electrolysis with enhanced interfacial electrical conductivity)[J].矿物冶金与材料学报,2022(05):1090-1098

GDLs

Novel,nanoparticles,inlaid,titanium,PEM,water,electrolysis,enhanced,interfacial,electrical,conductivity,Proton,exchange,membrane,WE,particularly,promising,technology,renewable,hydrogen,produc,However,excessive,passivation,gas,diffusion,layer,will,seriously,affect,high,surface,contact,resistance,energy,losses,Thus,mechanism,improving,interface,stability,urgent,issue,In,this,work,have,prepared,hydrophilic,corrosion,resistant,conductive,composite,protective,polydopamine,PDA,film,Ti,which,was,obtained,via,solution,oxidation,method,ensured,that,neither,micropores,nor,pinholes,existed,final,hybrid,coatings,situ,reduced,gold,AuNPs,improved,achieve,desired,further,composition,treated,samples,investigated,using,scanning,electron,microscopy,transmis,TEM,ray,diffraction,Fourier,transform,infrared,spectroscopy,FTIR,results,indicated,optimized,reaction,conditions,included,value,HAuCl4,deposition,papers,revealed,lowest,H2SO4,ppm,RHE,among,all,modified,specimens,where,represents,reversible,electrode,These,findings,very,appropri,modification,systems

0.632104