Frontiers in Energy Research
·
2021
·
IF 4.008
Liu Yang,Zhang Yuchen,Xie Tao,Yue Ming,Wang Dongsen,Li Bin
In light of the difficulty of solid-liquid separation of waste PEM drilling fluid in the Bohai oilfield, constructing an inorganic-organic flocculation system is proposed and the processing method of destabilization technology is optimized. The biggest influence factor on the flocculation process of PEM drilling fluid was determined by designing an orthogonal test. The flocculation mechanism was researched through single factor optimization, combined with zeta potential and particle size distribution test. The results showed that the most significant factors affecting the flocculation of waste PEM drilling fluid were the dosage of inorganic flocculant CaCl2 and flocculation pH value. When the dosage of inorganic flocculant CaCl2 was 1.2% (w/v), the dosage of organic flocculant SDYJ-2 was 0.05%, the flocculation pH value was 3, and the flocculation time was 5 min, the flocculation technology reached the optimization and then the liquid yield can reach 70.96%. The mechanism of flocculation and destabilization was as follows: the inorganic flocculant of CaCl2 mainly reduced the zeta potential of clay particles through electric neutralization. 1% CaCl2 could reduce the potential mean value of drilling fluid system from -38.1 mV to -32.5 mV, and then decrease the repulsion among suspensions. Through bridging curling and electric neutralization, the organic flocculant of SDYJ-2 can absorb and wrap the clay particles after flocculation destabilization to form a network spatial structure, which made clay particles aggregate into large flocs and particles. D50 can increase by 21.5 times, when the concentration of SDYJ-2 was 0.15%.
研究领域:
石油工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Shuyu Zhang,Yu Luo,Di Yu,Xianfeng Guan,Wanzhen Wu,Cuicui Li,Guangpeng Ma,Xinpu Zhou,Shuang Wang
Quaternary ammonium (QA) group is widely used in high-temperature proton exchange membranes (HT-PEMs) because of its own strong basicity and ability to form QA–diphosphate ion pairs with phosphoric acid (PA). In this work, compared with other introductions of QA groups in membranes, by adding QA sites to the polybenzimidazole (PBI) main chains, not only PA retention is improved but also the imidazole N–H sites are conserved, which allow them to participate in proton transfer and further improve proton conductivity. QMPBI was prepared by introducing QA groups into the main chains of methyl-containing polybenzimidazole (MPBI) through a series of modifications in order to improve PA uptake and retention. Then, QMPBI and presynthesized polymeric ionic liquid (PIL) containing two nitrogen-positive ion pairs undergo cross-linking to generate composite membranes with different quaternization ratios-QMPBI-X-PIL (where X = 30, 50, 70%). It is experimentally verified that the QMPBI-70%-PIL membrane at a quaternization ratio of 70% has the best proton conductivity and PA retention rate. The QMPBI-70%-PIL membrane had a proton conductivity of 126.22 mS cm–1 at 180 °C and a maximum residual mass of 85.71% at 160 °C/0% RH after a 240 h PA retention test. At 160 °C without humidity, the peak power density of the QMPBI-70%-PIL membrane could reach 454.89 mW cm–2. In conclusion, QMPBI-70%-PIL membranes are expected to be widely used in HT-PEMs.
研究领域:
材料科学
·
电化学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·Vol. 54
·期 10
·2269-2279
·
IF 2.4
Huang He,Chen Taipu,Fang Dahui,Cao Longsheng,Wang Guoxiang,Hao Jinkai,Shao Zhigang
The design of low-cost and high-performance anodic electrocatalyst is essential in proton exchange membrane water electrolysis (PEMWE) application. Herein, we design and synthesize a core–shell structure with Ir-rich shell and AuIr alloy core by using a simple liquid phase reduction method, which exposed a large number of active sites. The d-band center of Ir active sites, merely 2 nm in size, was shifted by the electronegativity difference between the Au and Ir atoms at the core–shell interface. The strong electronic effect can inhibit the dissolution and corrosion of Ir active sites under acidic and high potential conditions. As a result, Ir x @Au 0.25 Ir 0.75− x catalyst shows merely 235 mV overpotential at the current density of 10 mA cm −2 , 75 mV lower than the commercial Ir black catalyst, and 2.6-fold higher mass activity than the commercial Ir black catalyst. Furthermore, when Ir x @Au 0.25 Ir 0.75− x was used as the anionic catalyst, the electrolysis voltage at 1 A cm −2 is 1.7 V in PEMWE, and this activity was maintained for more than 100 h and had exhibited excellent stability, indicating its ideal prospects as an electrocatalyst. Graphical abstract AuIr alloy with Ir-rich core and AuIr alloy shell exposed numerous active sites and improved the utilization efficiency of electrocatalyst.
研究领域:
电化学
·
材料科学
·
催化
·
纳米技术
·
能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 3
·034513
·
IF 4.386
Yu Leng,Daijun Yang,Pingwen Ming,Bing Li,Cunman Zhang
Corrosion of stainless steel bipolar plate (BPP) remains a big challenge while it has been considered to be one of the most appropriate candidates for proton exchange membrane fuel cell (PEMFC) in automotive application. This work aims to study comprehensively the effects of temperature, pH, bubbled gas and potential on corrosion behaviours of SS316L. Moreover, SEM and EDX are performed to reveal the evolutions of surface morphology, microstructure and chemical composition of SS316L under different testing conditions. The results indicate that temperature, pH and potential have significant influences on corrosion potential (Ecorr.), corrosion current density (Icorr.) and passive current density (Ip) of SS316L. In addition, interactions between different testing conditions on corrosion resistance are strong. The main corrosion mechanism of SS316L would be shifted from pitting to intergranular or uniform corrosion as pH decreases from 3 ∼ 5 to 0.3 ∼ 1. Accelerated testing solutions with pH in the range of 0.3 ∼ 1 may be suitable to evaluate corrosion resistance of materials for BPP at lower potential. However, simulated testing conditions with pH in the range of 3 ∼ 5 is more appropriate when higher potentials of 1.0 ∼ 1.4 V (vs Ag/AgCl) need to be considered.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2018
·
IF 0.734
GAO PINGPING,OUYANG CHUN,XIE ZHIYONG,TAO TAO
The Ni-P/TiN coating was used as bipolar plate by electroless plating on Ti. Surface morphology and phase structure of the coatings were characterized by SEM and XRD, respectively. Corrosion resistance of Ni-P and Ni-P/TiN coating was measured in the simulated solution of Proton exchange membrane fuel cells (PEMFCs). The interfacial contact resistance (ICR) was conducted by applied different forces. SEM images indicated that the particles of core–shell structure were formed on the surface of coating on Ti substrate. The core–shell structure was composed of TiN core and Ni-P electroless plating shell. Compared with Ni-P coatings, the Ni-P/TiN coating showed better corrosion resistance behaviors and low ICR (below 10 m Ω cm − 2 under pressure of 200 N/cm 2 ) . TiN particles and distribution of core–shell were in favor of the formation of coating and compact surface morphology. The good conductivity was attributed to the compact surface morphology of coating. The Ni-P/TiN coating showed excellent interfacial conductivity and good corrosion resistance at applied high potential in simulated solution of PEMFCs.
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 MEMBRANE SCIENCE
·
2021
·
IF 8.742
Youxiu Huo,Qingbing Li,Zhiyan Rui,Rui Ding,Jia Liu,Jia Li,Jianguo Liu
The need to reduce the cost of proton exchange membranes (PEMs) leads to less usage of perfluorinated sulfonic acid (PFSA), which would definitely result in a decline in the membrane lifespan under the attack of free radicals. In this study, polytetrafluoroethylene (PTFE) is used as a reinforced material to make a thinner composite membrane due to the poor mechanical strength of the pristine membrane. Moreover, a polydopamine (PD)-treated strategy was selected to make hydrophilic PTFE, which allows the adoption of a high-boiling point solvent for the dissolution of resveratrol , a natural antioxidant produced by plants that acts as a free radical scavenger (FRS) in the membrane to prevent the membrane from being attacked. With the help of dimethyl formamide (DMF), a high-boiling point solvent, and hydrophilic groups in PD molecules, a Nafion/PD@PTFE/resveratrol composite membrane with a thickness of 10 μm was prepared and tested using an accelerated degradation test (ADT) strategy. With a resveratrol dose of 1 wt%, the cell presented a lower hydrogen crossover of 2.82 mA cm −2 and a longer lifespan than those of a membrane without resveratrol while cell performance did not suffer too much damage. In the ADT experiment, the hydrogen crossover of Nafion/PD@PTFE/resveratrol was still less than 20 mA cm −2 after 8 open circuit voltage (OCV) cycles, while that without resveratrol increased to 80 mA cm −2 in 3 OCV cycles.
研究领域:
材料科学
·
能源化学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2018
·Vol. 33
·期 1
·212-220
·
IF 0.524
Liu Qingting,Ni Na,Sun Quan,Wu Xiaoxue,Bao Xujin,Fan Zhang,Zhang Rong,Hu Shengfei,Zhao Feng,Li Xiao
Novel organic-inorganic composites were in-situ synthesized by using TriSilanolPhenyl polyhedral oligomeric silsesquioxane (SO-POSS) as fillers and poly(2,5-benzimidazole) (ABPBI) as polymer matrix. The uniformly dispersed 3% SO-POSS particles in ABPBI matrix increased the thermal stability of the composite membranes. It was found that both the water and H 3 PO 4 uptakes were increased significantly with the addition of SO-POSS due to the formation of hydrogen bonds between the POSS and H 2 O/H 3 PO 4 , which played a critical role in the improvement of the conductivity of the composite membranes at temperature over 100 °C. Proton conductivities of H 3 PO 4 doped with 3wt% SO-POSS contained ABPBI membranes increased with the increase of H 3 PO 4 absorbance, reaching the maximum proton conductivity of 2.55 × 10 -3 S·cm -1 at 160 °C, indicating that the ABPBI/SO-POSS composite membrane could be a promising candidate for mid-temperature PEMFCs.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 6
·1025-1030
·
IF 1.113
Gao Zhe,Jiang Gaoming,Ma Pibo
Building proton transfer channel is an important strategy to optimize the proton transfer process of the proton exchange membrane (PEM). In this work, sulfonated pre-oxidized nanofibers were prepared by solution blowing of polyacrylonitrile (PAN) nanofibers followed by pre-oxidization and sulfonating, and the nanofibers were composited with SPEEK to enhance its performance as PEM. The results of the proton conductivity verified that the employment of sulfonated pre-oxidized nanofibers improved the proton conductivity. Meanwhile, the introduction of the sulfonated pre-oxidized nanofibers realized the upgrades of the thermostability and water absorbency of the membrane, and led to the decrease of the swelling property and methyl alcohol’s permeability of the material. It is indicated that the composite membrane is promising materials for PEM fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jinpeng Li,Zhi Wang,Xiangrui Chen,Zhaokun Wang,Jiashuai Wang,Haofeng Shi,Chengdeng Wang,Zhiming Bai,Yan Gao,Chuang Zhu,Xiaoqin Yan
The development of efficient, stable, and cost-effective electrocatalysts for hydrogen evolution reactions is of utmost importance in order to replace expensive Pt-based catalysts in proton exchange membranes (PEMs) and advance the storage and conversion of hydrogen energy. Herein, a novel electrocatalyst, NixCo1–xSe2 N-doped carbon hollow polyhedrons (NCHP), was prepared by employing a ZIF-8@67 core–shell composite precursor and implementing a pyrolysis–selenylation process. In particular, Ni0.1Co0.9Se2/NCHP demonstrated a remarkable performance for the HER in a wide pH range. It exhibited a low overpotential of 89.8 mV and a small Tafel slope of only 48.3 mV dec–1 at a current density of 10 mA cm–2 in 0.5 M H2SO4. It could also exhibit exceptional properties in 0.1 M PBS and 1.0 M KOH conditions simultaneously. The PEM electrolyzer, incorporating Ni0.1Co0.9Se2/NCHP as the cathode, exhibited remarkably high critical current density (1.83 V@500 mA cm–2) and outstanding stability (500 mA cm–2@100 h). The microscopic characterization and theoretical calculation revealed that the evaporation of inner zinc effectively mitigated element agglomeration, while the incorporation of an appropriate amount of nickel atoms into CoSe2 induced favorable adsorption–desorption behavior. This modification accelerated the kinetics of the HER, thereby enhancing the electrocatalyst’s intrinsic catalytic activity and stability.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Shengyang Zheng,Fan Gong,Wenyuan Chen,Rui Zhang,Mingya Chen,Mengqi luo,Wanxiang Zhao,Zhiqiang Xie,Shuiyong Wang,Gaoqiang Yang
The interface between the anode porous transport layer (PTL) and the catalyst-coated membrane (CCM) plays a crucial role in determining the efficiency of the proton exchange membrane water electrolyzer (PEMWE). Notably, clamping pressure emerges as a crucial factor that affects this interfacial contact. This work focuses on the assembling parameters contributing to variations in clamping pressure between the PTL and the CCM in PEMWE. We systematically examine the impact of PTL compression, torque, and CCM expansion caused by water uptake on PEMWE performance. The assembling parameters determined in this study—0% PTL compression, 3.5 N m torque, and CCM expansion—satisfy the performance requirements for PEMWE while maintaining the integrity of the electrode. Electrochemical diagnostics, combined with pressure-sensitive paper analyses, demonstrate that CCM expansion provides a sufficient conductive pathway between the catalyst layer (CL) and PTL, thereby achieving lower contact resistance. Physical characterization analysis demonstrates that the CCM expansion provides a more uniform clamping pressure, further protecting the CL from damage and resulting in better performance and durability.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Wenyuan Chen,Jinchao Jiang,Zhenye Kang,Min Wang,Bin Hou,Zhiqiang Xie,Gaoqiang Yang
The interfacial structure between the porous transport layer (PTL) and catalyst layer (CL) plays a critical role in determining the performance of PEM water electrolyzers. This study investigates three titanium PTLs—Ti felt, Ti woven mesh, and Ti mesh—focusing on their contact area, contact edge length. Results show that a larger contact area enhances catalyst activation at low current densities, while longer edge length supports uniform reaction distribution and improved transport under high current loads. Excessively wide land regions were found to hinder water accessibility and reduce effective reactive area. A current-dependent transition was observed in the dominant structural factor affecting catalyst utilization, further validated by an equivalent resistance model. These findings highlight that optimizing PTL/CL interfacial geometry is key to enhancing electrolyzer performance beyond material selection alone.
✓ 已验证
DOI
高影响因子
Energies
·
2025
·Vol. 18
·期 16
·4396
·
IF 3.2
Shufeng Yang,Bin Hou,Zhiqiang Xie,Gaoqiang Yang
The engineering of porous transport layer (PTL)–catalyst layer (CL) interfacial architecture plays a critical role in optimizing the performance of proton exchange membrane water electrolyzers (PEMWEs). Particularly, at the PTL-CL interface, our results reveal that anode catalyst loadings affect the modulation of the PTL surface structure on the overpotentials of PEMWEs. Under high anode catalyst loadings, the magnitude of overpotentials is predominantly governed by the electronic conductivity and mass transport resistance within the CL, where the modifying effects of PTL-CL interfacial contact characteristics become negligible. However, when the catalyst loading is reduced, the PTL-CL interfacial contact characteristics become critical for electron conduction, mass transport, and kinetic reaction. Under low catalyst loadings, the etched PTL demonstrates a maximum reduction of 59 mV compared to the pristine PTL at 4 A/cm2, with the former exhibiting a 10 mΩ·cm2reduction. Meanwhile, the etched PTL integrated with a cell demonstrates superior performance in both mass transport and kinetic overpotentials compared to a pristine PTL. This clearly indicates that the surface structure of the PTL plays an increasingly significant role in regulating the overpotentials of PEMWEs as the catalyst loadings decrease.
研究领域:
电化学能量转换
·
氢气生产
·
能源系统材料科学
·
燃料电池与电解槽
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）