Journal of Rubber Research
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2023
·Vol. 26
·期 1
·47-54
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IF 1.3
Jiang Jian-Liang,Yang Xiao,Zhao Dongqi,Feng Ya-kai
Blending is an economical and feasible method to improve the properties of polymers. To improve the mechanical properties of ethylene acrylate rubber (AEM), a series of hydrogenated nitrile butadiene rubber (HNBR)/AEM blends were prepared. The mechanical, thermal properties and compatibility of HNBR/AEM blends were investigated in detail. Carbon black filled HNBR/AEM blends exhibited excellent mechanical properties as well as good resistance to high and low temperature. The reactivity of HNBR was higher than that of AEM at a high temperature (180 °C) in air. The crosslinking reaction was more likely to occur in HNBR rubber, while it is not easy to remove small molecules at high temperature. The degradation temperature ( T d5% ) of AEM (350 °C) was lower than that of HNBR (390 °C), while the hot-air ageing tests indicate that the retention of tensile strength of AEM (95%) was much higher than that of HNBR (58%). HNBR/AEM blends were compatible within the full range of formulations, and have been mutually validated by SEM, dynamic mechanical analysis and mechanical property models of HNBR/AEM blends.
研究领域:
材料科学
·
高分子化学
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 32
·21106-21113
·
IF 10.7
Minghui Cui,Yansong Zhou,Rongjing Guo,Wenqi Zhao,Yanjing Liu,Qiongrong Ou,Shuyu Zhang
Electrolytic water splitting using renewable energy sources, such as solar power, provides a green and sustainable approach for hydrogen production. Anion exchange membrane (AEM) electrolyzers present substantial commercial prospects; however, the rate of hydrogen evolution reaction (HER) in alkaline electrolytes is limited by the water dissociation step. In this work, we fabricated an N-doped Ni substrate for loading ultrafine Pt nanoparticles, realizing spatial decoupling of the reaction process to break the limitation of water dissociation, where the N-doped Ni substrate and Pt nanoparticles facilitate the supply of ample H* and H2 release, respectively. The prepared Pt–N–Ni/NC with extremely low Pt loading (1.0 wt%) requires only 15 and 149 mV overpotentials to reach current densities of 10 and 1000 mA cm−2, respectively. When assembled into an AEM electrolyzer, the system requires a cell voltage of only 1.75 V to achieve a current density of 1000 mA cm−2. Notably, the solar-driven AEM electrolyzer demonstrates a current density of 1390 mA cm−2 with a solar-to-hydrogen efficiency (STH) of 8.27%. This study proposes a strategy to achieve efficient utilization and performance improvement of precious metals, promoting the development of efficient green hydrogen production.
研究领域:
材料科学
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可再生能源
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电化学
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Membranes
·
2019
·Vol. 9
·期 3
·36
·
IF 0
Zhihao Zheng,Bart Van der Bruggen,Pang Xiao,Jiangnan Shen,Huimin Ruan,Junbin Liao,Congjie Gao,Bart Van der Bruggen,Jiangnan Shen
A facile membrane surface modification process for improving permselectivity and antimicrobial property was proposed. A polydopamine (PDA) coating was firstly fabricated on pristine anion exchange membrane (AEM), followed by in situ reduction of Ag without adding any extra reductant. Finally, 2,5-diaminobenzene sulfonic acid (DSA) was grafted onto PDA layer via Michael addition reaction. The as-prepared AEM exhibited improved permselectivity (from 0.60 to 1.43) and effective inhibition of bacterial growth. In addition, the result of the long-term (90-h continuous electrodialysis) test expressed the excellent durability of the modified layer on membrane surface, because the concentration of Cl−and SO42−in diluted chamber fluctuated ~0.024 and 0.030 mol·L−1with no distinct decline. The method described in this work makes the full use of multifunctional PDA layer (polymer-like coating, in situ reduction and post-organic reaction), and a rational design of functional AEM was established for better practical application.Keywords:electrodialysis;antimicrobial;anion exchange membrane;permselectivity
研究领域:
材料科学
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化学工程
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环境科学
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PubMed
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhen Xu,Qi Xiang,Junchi Zhao,Xuede Qi,Hu Yuan,Dongdong Li,Jingwen Liu,Xiaoyi Huang,Qian Xue,Andreu Cabot,Xueqiang Qi
Fe-doping and oxygen vacancies synergistically optimize NiCo 2-x Fe x O 4-y for alkaline OER. • Oxygen vacancies facilitate OH − adsorption to accelerate the AEM pathway. • Fe species modulate oxygen covalency to trigger the LOM pathway. • Oxygen vacancies act as oxygen reservoirs to regenerate lattice oxygen. • Dynamic regeneration prevents structural collapse, harmonizing AEM and LOM. Developing oxygen evolution electrocatalysts that combine high activity, long-term durability, and low cost remains a central challenge because these properties are often constrained by competing reaction pathways. The adsorbate evolution mechanism (AEM) is limited by linear scaling relationships, whereas the lattice oxygen mechanism (LOM) offers higher activity but typically suffers from structural degradation due to lattice oxygen loss. Here, we demonstrate that Fe doping in NiCo 2 O 4 creates a synergistic interplay between Fe active sites and oxygen vacancies, enabling both enhanced activity and durability. Experimental and theoretical analyses reveal a dual-mechanism pathway: oxygen vacancies facilitate OH − adsorption to accelerate the AEM, while Fe species regulate O covalency to activate the LOM. Consequently, the optimized NiCo 1.4 Fe 0.6 O 4-y catalyst achieves an ultralow overpotential of 196 mV at 10 mA cm −2 . Furthermore, oxygen vacancies are proposed to facilitate lattice‑oxygen replenishment during LOM operation, thereby helping to mitigate structural degradation. This dynamic regeneration mechanism underpins the excellent long-term stability of more than 290 h. Overall, this work offers a practical strategy to break the activity–stability trade-off in oxygen evolution catalysis through oxygen-vacancy engineering of dual-mechanism pathways. Defect engineering synergistically unlocks coupled AEM and LOM pathways, with abundant oxygen vacancies accelerating intermediate adsorption and dynamically regenerating lattice oxygen, effectively breaking the intrinsic trade-off between catalyst activity and durability during alkaline water splitting. Download: Download high-res image (199KB) Download: Download full-size image
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Science Advances
·
2026
·Vol. 12
·期 9
·
IF 13.9
Xinyi Li,Jiyu Liu,Zhongfeng Wang,Hong Huang,Xiaoyuan Sun,Wenting Lu,Xiao Zhao
Coordination engineering is often used to tune the electronic structures of active sites, while their catalytic performances are determined not only by electronic structures but also by microenvironments. Herein, we introduce interfacial functional ligands that not only optimize the electronic structures of active sites but also regulate the interfacial microenvironment for oxygen evolution reaction (OER). Specifically, the pore edge–hosted FeF 3 O 2 sites enable a favorable electronic structure to generate * OOH intermediates and simultaneously promote the interfacial transport of hydroxide for enhanced OER kinetics. The F ligands in FeF 3 O 2 sites interact with interfacial water strongly via H-bonding to promote H-bond network connectivity, thus encouraging the temporally concerted proton transfer during hydroxide diffusion. Consequently, FeF 3 O 2 sites realize the 331.5-fold enhancement in turnover frequency for alkaline OER over the NiOOH and efficient water electrolyzers (1.663 voltage at 1.0 amperes per square centimeter at 60°C, durably operating at 1.0 amperes per square centimeter > 1200 hours).
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Small
·
2026
·
IF 11.8
Xinyi Han,Ziliang Deng,Yongping Yang,Zipeng Zhao
Self-supported electrodes represent a promising anode architecture for anion exchange membrane water electrolyzers; however, their practical implementation is hindered by an insufficient understanding of their formation mechanisms and the consequently limited catalytic efficiency and stability. In this work, we developed a self-supported electrode comprising a composite catalyst of β-Ni(OH) 2 and NiFe layered double hydroxide (LDH), grown on nickel felt (denoted as Ni(OH) 2 /NiFe-LDH/NFt) via a one-step hydrothermal process. We systematically investigated and clarified the role of NH 4 F in governing the synthesis of self-supported Ni(OH) 2 /NiFe-LDH/NFt. The coordination effect of F − with Fe 3+ and etching effect of NH 4 + on the surface oxide layer of nickel felt leads to favorable heterogeneous nucleation. Moreover, the etching effect provides an additional Ni source that favors the deposition of Ni(OH) 2 on NiFe-LDH. However, excess NH 4 + leads to the formation of Ni-based complex compounds in solution during the hydrothermal process and suppresses the deposition of Ni(OH) 2. When applying as the Ni(OH) 2 /NiFe-LDH/NFt anode catalyst in practical anion exchange membrane water electrolysis, it requires only 1.81 V to deliver 1.0 A cm −2 and exhibits outstanding durability, with no noticeable performance decay after 750 h of continuous operation at 0.5 A cm −2 .
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Zhaodi Huang,Xu Wang,Shuzhao Feng,Yaqi Bi,Qin Hao,Yan Liu,Caixia Xu,Ruiqin Zhang,Hong Liu,Weijia Zhou
Polymetallic foam-supported multiscale porous NiCrFeAlZn HEA is fabricated via Zn-driven selective dealloying strategy. • NiCrFeAlZn delivers 3000 mA/cm 2 at 1.8 V, and runs stably for 1200 h at 1000 mA/cm 2 with an ultralow decay rate of 48.3 μV/h. • Multi-site synergistic catalysis on NiCrFeAlZn mitigates active-site poisoning from excessive adsorption of intermediates. Self-supporting high-entropy alloys (HEAs) present great application potential for anion exchange membrane water electrolysis (AEMWE), but still confront challenges in achieving efficient gas-liquid mass transfer while mitigating interfacial delamination under ampere-level current densities. Herein, an integrated NiCrFeAlZn HEA embedded within the substrate interior is fabricated by liquid-solid alloying between polymetallic NiCrFeAl foam and deposited Zn, followed by chemical Zn etching. The resultant bark-like architecture with multiscale pore networks and superaerophobic-superhydrophilic surfaces accelerates electrolyte infiltration, gas bubble detachment, and reaction kinetics toward overall water electrolysis. Accordingly, the bifunctional NiCrFeAlZn-based AEMWE achieves an ampere-level current density of 3000 mA/cm 2 at 1.8 V, and exhibits robust durability over 1200 h at 1000 mA/cm 2 with a degradation rate of 48.3 μV/h. In situ Raman spectroscopy and theoretical calculations reveal a multi-site synergistic catalysis mechanism. Al and Cr function as active centers for water dissociation and OH - adsorption; Ni and Fe promote the conversion of key intermediates toward H 2 and O 2 generation; Zn and Al act as electron donors to modulate the electronic structure and reduce the reaction energy barrier. This Zn-driven selective dealloying protocol based on polymetallic foams for fabricating bifunctional high-entropy electrodes with multi-site synergy holds great promise for AEMWE applications. Download: Download high-res image (194KB) Download: Download full-size image An integrated NiCrFeAlZn high-entropy alloy immobilized on polymetallic foam with multiscale pore structures and multisite synergistic catalytic is fabricated via a Zn-induced selective dealloying route for ampere-grade AEM water electrolysis
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Heming Wang,Xueyong Song,Huihui Zhang,Pan Tan,Fanxin Kong
An ion exchange membrane (IEM) is an important component in dual-chamber microbial fuel cells (MFCs) to separate cathodic chromium from anode bacteria to avoid toxicity. Common used IEMs (e.g., BPM, CEM, PEM, AEM) have different ionic transfer abilities which could influence MFC performance and chromium removal. Additionally, to distinguish chromium “removal” or “reduction” by MFCs, the chromium removal in this study was further analyzed into cathodic reduction, adsorption on the membrane and permeation through membrane to the anode chamber. It was found that BPM achieved the best performance in removing hexavalent chromium (99.4 ± 0.2 %) and balancing pH and conductivity in both chambers, followed by AEM (97.9 ± 0.8 %) and CEM (95.6 ± 0.8 %), while PEM can not well maintain pH and conductivity leading to the worst anode performance and lowest chromium removal efficiency. However, the adsorption of chromium on the AEM accounts for 91.1 ± 0.7 %, which was much higher than the other three membranes. The permeation of chromium through the membrane were all lower than 0.2% which can be ignored. SEM and EDS results showed that chromium deposits and bacteria were detected on the membrane facing cahtode and anode, respectively, indicating that membrane scaling and fouling were inevitable and happened within 24 h operation.
研究领域:
环境工程
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化学工程
·
电化学
·
水处理
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Shi-Yu Lu,Chuan Li,Longyu Qiu,Yan Zhang,Jiaming He,Minqi Liang,Xin Peng,Jun Zhang,Yin Liu,Juan Liu,Chuan Tan,Menggang Li,Meng Jin
Targeted regulation of electrocatalyst reconstruction during the oxygen evolution reaction (OER) under alkaline conditions proves essential to achieving highly efficient hydrogen production via electrochemical water splitting. Yet this remains a considerable challenge. Herein, we prepare an iron nickel phosphate (Fe-NPO) catalyst, which possesses substantial oxygen vacancies and an asymmetric Fe-O(P)-Ni coordination structure. This structural merit facilitates the effective deep reconstruction of Fe-NPO, which then transforms into the highly active Fe-Vo-P-NiOOH active phase during OER. For the reconstructed Fe-Vo-P-NiOOH, it effectively tunes the d-band center, bringing it notably closer to the Fermi level. This type of electronic modulation not only strengthens the water adsorption capacity but also optimizes the rate-determining step (RDS) in the OER pathway. The anion-exchange membrane water electrolyzer (AEMWE) integrated with the Fe-NPO catalyst as an anode catalyst achieved high industrial current densities of 500, 1000, 1500 and 2000 mA cm-2 at low applied voltages of 1.68, 1.76, 1.84 and 1.92 V, respectively. This work presents a strategy to realize the deep and efficient conversion of OER catalysts into highly active components through defect engineering and asymmetric coordination regulation, while also confirming Fe-NPO’s considerable potential for practical hydrogen production scenarios.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Can Cheng,Jianjun Li,Jinyan Cao,Jiaxiu Guo,Wanglai Cen
The absorption properties of N-(2-hydroxyethyl) morpholine (HEM), morpholine (MP) and N-(2-aminoethyl) morpholine (AEM) for SO 2 were studied using sulfolane (SUL) as solvent in this work. Among these solvent combinations, HEM/SUL shows the best cyclic absorption performance, and the capacity of HEM-SUL-40 (40 wt% of HEM and 60 wt% of SUL) to absorb 8580 mg/m 3 SO 2 (the remainder is N 2 ) is 192.18 mg/g at 293.15 K. The absorption capacity of the second cycle is 97.5% of the first absorption cycle, which is higher than 70% of the Cansolv amine solution in a commercial application with similar experimental conditions. However, MP/SUL is difficult to desorb at high temperature, and the absorption capacity of AEM/SUL is much lower than HEM/SUL and MP/SUL. According to the FTIR , 1 H NMR and 13 C NMR, all three cyclic amines have charge transfer effects with SO 2 . The structure of HEM/SUL can be recovered after heating, but MP cannot be recovered. Δ r G m ° in the reaction against HEM with SO 2 increases significantly with increasing temperature. The Δ r G m ° of HEM-SO 2 and MP-SO 2 at 353.15 K is −12.56 kJ/mol and −16.29 kJ/mol, respectively, which further explains the easy desorption of HEM-SO 2 and the difficult desorption of MP-SO 2 at high temperature.
研究领域:
化学工程
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环境科学
·
物理化学
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhuoming Wei,Mengwei Guo,Qibo Zhang
Water electrolysis is a promising technique for green hydrogen production to achieve the global strategic goal of carbon neutrality . Herein, we propose an optimized-electrodeposition set-up in Ethaline-based deep eutectic solvent (DES) for the electrochemical preparation of NiFe-based catalysts. The developed synthesis procedure involves the anodic dissolution of Fe plates to provide Fe sources, which are gradually incorporated into the in-situ grown Ni films to fabricate NiFe-based electrodes. Our findings show that introducing nitrate ions coupled with electrochemical water oxidation can induce the formation of multi-vacancy-rich NiFe-based catalysts with outstanding water splitting performance in quasi-industrial conditions. A simulated industrial anion exchange membrane (AEM)-based device loaded with our NiFe-based electrocatalysts requires only 1.73 V cell to reach 1000 mA cm −2 in 5.0 M KOH at 60 °C and works continuously for up to 200 h. The present work provides a means for the scalable synthesis of self-supported NiFe-based catalysts for industrial water splitting.
研究领域:
电化学
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材料科学
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可持续能源
·
催化
·
化工工程
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高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2025
·
IF 3.7
Weiyu Xie,Zhenkun Cai,Zehua Bao
Saccharomyces cerevisiae is an important organism for basic research and applied biotechnology. Genome editing techniques, particularly CRISPR/Cas9 from Streptococcus pyogenes, have greatly facilitated saturation genome editing in yeast to understand mutant functions on a large scale. However, Cas9 is restricted by its targeting preference for G-rich protospacer-adjacent motif (PAM) sequences. To broaden the targeting scope, we established an efficient homology-integrated CRISPR/Cas12a system to install genetic variants through homologous recombination by targeting T-rich PAMs. We benchmarked the PAM compatibility of PAM-relaxed Cas12a variants and identified the improved LbCas12a (impLbCas12a) as the most efficient and PAM-relaxed variant in S. cerevisiae, showing high editing purity and an editing window centering the double-strand break. We show that our system can be used to perform targeted saturation mutagenesis to reveal functional variants not captured previously. By using a homology-integrated CRISPR RNA array, we utilized the multiplexing capability of CRISPR/Cas12a to realize multiplex genetic variant installation. Our system enriches the yeast genetic variant engineering toolbox, complementing the commonly used CRISPR/Cas9 system.
研究领域:
遗传学
·
分子生物学
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合成生物学
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基因组工程
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生物技术
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高影响因子
危险品化学品经营许可证（带存储）