SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Jiajia Cai,Lingna Kong,Xiangxuan Tang,Jianmin Wang,Zhihong Xie,Xianxuan Wang,Qian Xie,Qiyan Xu
Hematite (α-Fe 2 O 3 ) is one of the most promising candidates as a photoanode for photocathodic protection (PCP) of 304SS. However, serious charge recombination has hindered the application. In this work, we verified the feasibility of constructing heterojunction for enhancing the PCP performance. α-Fe 2 O 3 @Bi 2 S 3 can not only broaden the solar light absorption region but also provide a built-in electric field to improve charge separation and close junctions for charge transport. When α-Fe 2 O 3 @Bi 2 S 3 was coupled with 304SS, the OCP under illumination negatively shifted to −0.788 V Ag/AgCl , which was ca . 600 mV negative than the corrosion potential of 304SS. The photoinduced current density reached 32 μA cm −2 , outperforming the bare Bi 2 S 3 and α-Fe 2 O 3 . The formation of a type II heterojunction between Bi 2 S 3 and α-Fe 2 O 3 was proposed and verified by the electrochemical impedance measurements.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jiajia Cai,Yongjun Li,Zhengxin Cai,Xiangxuan Tang,Zhi Zhang,Jianmin Wang,Qian Xie,Pengyan Zhang,Song Li
Photocathodic protection (PCP) can convert solar energy into protecting marine metallic structures from corrosion. However, the serious photocarrier recombination in the photoanode has hindered the development of the PCP technique. This study reported a feasible approach to construct the heterojunction with a tunable built-in electric field by epitaxially growing CdIn 2 S 4 (CIS) on the surface of WO 3 . The light absorbance, carrier separation, and transportation were found to be strongly dependent on the built-in field, and it would enable not only protection of the 304SS but also retard the corrosion of more vulnerable Q235. Accordingly, the OCP of coupled photoelectrode shifted to -950 and -880 mV Ag/AgCl for 304SS and Q235, and their photocurrent density also reached 100 and 170 μA/cm 2 , respectively. Notably, the PCP performance of anti-corrosion on the 304SS and Q235 was visualized by microscopy, further proving the effectiveness of the photoanode. The underlying mechanisms and different protection capabilities were discussed in detail.
研究领域:
材料科学
·
腐蚀与防护
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Lin He,Yimin Gao,Yefei Li,Zhiwei Liu,Weiyao Zhang,Guangcan Zhou,Hongying He,Siyong Zhao,Honggang Liu,Wentao Yan
Ti(C,N)-304ss cermets with various rare earth yttrium addition were fabricated via powder metallurgy . Fe and Cr atoms dissolved into Ti(C,N) grains and formed a core-rim structure. The first-principle method was employed to calculate the lattice parameters and elastic modulus of the solid solution. The formation of solid solution not only reduced the lattice misfit between the binder phase and hard phase but also improved the hardness of hard phase. The in-situ formed nano-Y 2 O 3 particles existed at the center of Ti(C,N) grains acting as ‘mid effect’ heteromorphic nuclei. The microstructure of cermets was refined with Y addition and the abnormal growth of hard phase was suppressed. The mechanical properties were also improved with Y addition. When the Y content reached 0.3 wt%, the optimal mechanical properties were obtained with a TRS value of 1527 MPa and a hardness value of 91.7 HRA.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Jiang,Junaid Ali Syed,Yangzhi Gao,Qiuxiang Zhang,Junfeng Zhao,Hongbin Lu,Xiangkang Meng
Conductive polymer coating doped with large molecular organic acid is an alternative method used to protect stainless steel (SS) bipolar plates in proton exchange membrane fuel cells (PEMFCs). However, it is difficult to select the proper doping acid, which improves the corrosion resistance of the coating without affecting its conductivity. In this study, large spatial molecular group camphorsulfonic acid (CSA) doped polypyrrole (PPY) conductive coating was prepared by galvanostatic electropolymerization on 304SS. The electrochemical properties of the coating were evaluated in 0.1 M H 2 SO 4 solution in order to simulate the PEMFC service environment. The results indicate that the coating increased the corrosion potential and shifted E corr towards more positive value, particularly the j corr value of PPY-CSA coated 304SS was dropped from 97.3 to 0.00187 μA cm −2 . The long-term immersion tests (660 h) show that the PPY-CSA coating exhibits better corrosion resistance in comparison with the small acid (SO 4 2− ) doped PPY-SO 4 2− or PPY/PPY-SO 4 2− coatings. Moreover, the PPY-CSA coating presents low contact resistance and maintains strong corrosion resistance during the prolonged exposure time due to barrier effect and anodic protection.
研究领域:
材料科学
·
电化学
·
能源工程
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Haifeng Bian,Yanyan Du,Yilun Ren,Hao Wu,Yujie Ma,Beibei Yang,Shaochun Tang,Duan Bin,Hongbin Lu,Xiangkang Meng
Polypyrrole (PPY) coating is promising for the anticorrosion of stainless steel (SS) bipolar plates (BPs) in virtue of its good conductivity and corrosion resistance . However, the poor adhesion and pore defects of pure PPY coating limit its application. In this work, a PPY/Ti 3 C 2 T x MXene composite coating was synthesized on 304SS BPs by one-step electrodeposition , which is a facile method to realize the polymerization of PPY and the doping of MXene at the same time. The PPY/MXene coating exhibits better long-term immersion stability in simulated proton exchange membrane fuel cell (PEMFC) environment than pure PPY. The enhanced corrosion resistance is mainly benefited from the enhanced barrier effect, anodic protection effect and adhesion by the introduction of MXene. Meanwhile, the introduction of MXene significantly improves the conductivity of the coating and decreases the interfacial contact resistance at 1.4 MPa from 108.16 mΩ·cm 2 to 55.24 mΩ·cm 2 .
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Li Jiang,Junaid Ali Syed,Hongbin Lu,Xiangkang Meng
The enhancement in long-term corrosion resistance of conductive polymer coating is essential for the practical application, particularly to protect metallic bipolar plates in the aggressive environment of proton exchange membrane fuel cell (PEMFC). In this study, graphene oxide (GO) was introduced to polypyrrole (PPY) matrix, furthermore, PPY-GO composite coatings with different GO content were in-situ electrodeposited on 304 stainless steel (SS) bipolar plates to protect them from corrosion in the aggressive working environment. The electrochemical results imply that the conductive PPY-GO composite coatings significantly decrease the polarization current density of 304SS during potentiostatic polarization in the simulated PEMFC environment. The existence of GO in PPY matrix enhances the coatings adhesion strength and makes the diffusion pathway of corrosive species longer and more circuitous, further restricts their inward penetration. The PPY-GO coating with the optimized GO content of 1 mg mL −1 in the electrodeposition electrolyte shows the best corrosion resistance among the prepared coatings. This enhanced long-term corrosion protection of the PPY-GO composite coating in comparison with the pristine PPY coating is resulting from the enhanced physical barrier and anodic protection .
研究领域:
材料科学
·
电化学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Beibei Yang,Guoli Zhang,Jiayu Dong,Shaochun Tang,Lifang Zhang,Zhengguang Wu,Duan Bin,Yaqiong Song,Hongbin Lu
A conducting and anticorrosive coating is crucial for the application of metal bipolar plates (BP) in proton exchange membrane fuel cell (PEMFC). In this work, a Ti 3 C 2 T x (T)-carbon black (C)-acrylic epoxy (AE) coating is prepared on 304 stainless steel (SS) with enhanced corrosion resistance and conductivity. The corrosion resistance of the T-C-AE coating is investigated in a 0.5 M H 2 SO 4 solution as compared to the AE, T, and T-AE coatings. The T-C-AE coated 304SS exhibits the strongest corrosion resistance with the most positive corrosion potential and the lowest corrosion current density of 0.00673 μA cm −2 in all the samples, while retaining intact and compact surface morphology with the lowest metal ion dissolution even after immersed for 720 h. The addition of Ti 3 C 2 T x and carbon black into the AE matrix greatly decreases interfacial contact resistance (ICR), and the T-C-AE coating achieves a low ICR of 15.5 mΩ cm −2 under 140 N cm −2 compaction force . The excellent anticorrosion performance is mainly attributed to the physical barrier and the cathodic protection provided by the stacked Ti 3 C 2 T x (MXene) nanosheets in the T-C-AE coating. This eco-friendly, conducting, and anticorrosive T-C-AE coating has a good application prospect on SS BP of PEMFC.
研究领域:
材料科学
·
能源工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Haifeng Bian,Guoli Zhang,Qingxi Zhai,Yanyan Du,Yujie Ma,Beibei Yang,Shaochun Tang,Duan Bin,Xiangkang Meng,Hongbin Lu
Stainless steel (SS) is a promising material for designing bipolar plates (BPs), but their further application is limited by serious corrosion problems in the acidic environment. Ti 3 C 2 T x is expected to be used for SS BPs coatings, while galvanic corrosion will occur after the damage of Ti 3 C 2 T x coating. Herein, a PPY/Ti 3 C 2 T x -AE double-layer coating (DC) is well-designed and prepared on 304SS BP, which is composed of an inner electropolymerized PPY layer and an outer Ti 3 C 2 T x -acrylic epoxy layer. When tested in 0.2 M HCl solution, the corrosion potential and corrosion current density of the DC are 38 mV and 0.00927 μA cm −2 respectively, which are superior to those of the PPY coating and the Ti 3 C 2 T x coating. Moreover, the DC presents the best long-term stability among the three coatings. The excellent corrosion resistance is attributed to the barrier and anodic protection effects as well as the solution of galvanic corrosion. The new coating system provides a new insight into the design of DC coatings of SS BPs.
研究领域:
材料科学
·
电化学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.7
Qian-Yu Wang,Teng Xu,Ji-Ming Hu
In this work, TiO 2 was firmly attached on freestanding graphene (Gr, rather than graphene oxide or reduced graphene oxide) nanosheets (Gr@e-TiO 2 ) by a novel electrodeposition method. The morphology, crystal structure, band gap characteristics, optical properties and photoelectric properties were systematically investigated. It is indicated that the absorption of visible light increased and the recombination of photogenerated electron-hole pairs decreased for the as-obtained Gr@e-TiO 2 . Compared with pure TiO 2 as well as GO (graphene oxide)@h-TiO 2 prepared by conventional hydrothermal method, Gr@e-TiO 2 exhibited a more negative open circuit potential and higher photocurrent density for 304SS protection. The enhanced photocathodic protection performance of Gr@e-TiO 2 can be attributed to the large specific surface area and good charge transport efficiency of graphene.
研究领域:
材料科学
·
电化学
·
纳米技术
·
腐蚀防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Li Jiang,Junaid Ali Syed,Guoli Zhang,Yujie Ma,Jun Ma,Hongbin Lu,Xiangkang Meng
The enhanced corrosion resistance with sustained conductivity are the prerequisites of stainless steel bipolar plates for practical application in proton exchange membrane fuel cell. Herein, we prepare a conductive polypyrrole-graphene oxide/polypyrrole-camphorsulfonic acid bilayer composite coating (PPY-GO/PPY-CSA) on 304 stainless steel bipolar plate by electrodeposition method. The electrochemical tests are conducted in the simulated bipolar plates working environment, the potentiostatic polarization results imply that the PPY-GO/PPY-CSA composite coating offers stable corrosion resistance with low potentiostatic corrosion current density in comparison with the PPY-GO coating. The corresponding electrochemical impedance spectroscopy measurements reveal that the PPY-GO/PPY-CSA composite coating exhibits satisfactory conductivity and displays sustained anodic protection effect with superior anticorrosion performance during the 696 h of immersion. The excellent corrosion protection ability of the PPY-GO/PPY-CSA composite coating owing to its good adhesion strength, compact structure, satisfactory conductivity as well as the synergetic interaction between the two layers of the coating.
研究领域:
材料科学
·
电化学
·
能源工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）