JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Junqiao Jiang,Min Xiao,Sheng Huang,Dongmei Han,Shuanjin Wang,Yuezhong Meng
Phosphoric acid (PA)-dependent proton conductivity and polymer-offered mechanical properties are contradictory in high-temperature proton exchange membranes (HT-PEMs). Microphase separation strategy contributes to achieve a tradeoff between proton conductivity and mechanical properties. Herein, a kind of phosphonic acid-imidazolium containing polymer (PICP) ionomeric membranes, in which acidophilic (imidazolium) and acidophobic groups (-PO 3 H 2 ) can be induced to form a microphase separation structure by PA, are firstly prepared. The acidophilic phase with adsorbed PA plays the role of proton conduction and the acidophobic phase can not only provides -PO 3 H 2 group synergistically conduct protons but also largely maintains the intrinsic mechanical properties. As a result, the PICP ionomeric membranes with microphase separation structure possess high proton conductivity (48 mS cm −1 , 160 °C) and satisfying mechanical strength (16.5 MPa) simultaneously at a moderate PA doping level (130 wt%). The fuel cell based on such HT-PEMs demonstrates a peak power density of 493 mW cm −2 and high voltage stability. This is the first report of phosphonic acid-imidazolium containing ionomeric membranes with satisfactory fuel cell performance and durability, representing a meaningful step towards practical HT-PEM fuel cells.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 45
·31518-31525
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IF 10.7
Qiyan Sun,Yu Miao,Ruixue Zhang,Guang-Rui Xu,Chuanfang Zhang,Kang Liu,Zexing Wu,Lei Wang
Water electrooxidation in proton exchange membrane (PEM) water electrolyzers has been considered to be a four-electron pathway mechanism, which leads to inherent sluggish kinetics that severely limits the scalable production of high-purity H2. Herein, cobalt phosphide/iron phosphide (Co2P/FeP) nanosheets with electron redistribution through aerogel-assisted and gas-phase phosphorization strategies have been reported. Benefiting from the unique nanosheet structure and electron redistribution induced by p–d hybridization interaction, the as-obtained Co2P/FeP nanosheets display outstanding alkaline oxygen evolution reaction (OER) performance. Co–P and Fe–P charge bridges trigger p–d orbital hybridization between the transition metal and P elements, which downshifts the d-band center of Co2P/FeP nanosheets and accelerates the formation of *OOH with a lower energy barrier that can expedite the water electrooxidation process with an overpotential of 257 mV to reach the 10 mA cm−2 current density and a Tafel slope of 39.6 mV dec−1. This work provides a deep insight into understanding the remarkable OER properties of transition metal phosphates by electron redistribution.
研究领域:
材料科学
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电化学
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纳米技术
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能源材料
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Pengtao Lei,Xiangyang Xu,Chenyu Huang,Dongsheng Chen,Zhenkun Jiang
To optimize the proton transport performance of polyvinylidene fluoride (PVdF), a proton exchange membrane (PEM) material, carbon nanotube (CNT), and zirconium hydrogen phosphate (ZrP) have been blended into the PVdF matrix. Adopting a hydrothermal synthesis route, the acidic ZrP can be better conjugated with the positively charged CNT functionalized by cetyltrimethylammonium bromide (CTAB). As visualized using electroscopes, ZrP nanocrystallines are intimately dotted and homogeneously distributed on CNT. The ZrP–PVdF interaction can be attributed to hydrogen bonding between hydroxyl and F-terminal groups. By incorporating well CNT/ZrP into PVdF via solution casting, the pore architecture can be regulated; namely, the macro-voids in PVdF are greatly reduced. The composite membranes exhibit tensile stress of 48–52 MPa while sustaining the thermal stability of PVdF. The incorporated CNT/ZrP can suppress void porosity and enhance film hydrophilicity. With improved wettability, the methanol permeability can be reduced to less than 2 × 10 −9 cm 2 ∙s −1 , ca. one-sixth that of pure PVdF. The proton conductivity for PVdF-CNT 0.03 -ZrP 0.06 , with CNT and ZrP mass content respectively 3 and 6 wt% that of PVdF, attains 0.089 S·cm −1 at 100°C, showing upgraded conducting capability. The membrane selectivity can be remarkably enhanced, verifying that CNT/ZrP blending is a facile and profitable approach for PEM optimization.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 32
·2201600
·
IF 29.698
Zhenyu Chen,Chao Hao,Bowen Yan,Qiuyan Chen,Huiyan Feng,Xiaoqing Mao,Jianmei Cen,Zhi Qun Tian,Panagiotis Tsiakaras,Pei Kang Shen
Traditional calcination usually causes sintering of Pt, which diminishes Pt exposure in proton exchange membrane fuel cell (PEMFC) electrodes. In the present work, a facile self-confined method for synthesizing highly dispersed PtCo-alloy on Co, N co-doped mesoporous carbon (PCN-MC) is developed via a dual-template strategy. Owing to the co-confined effect of Zn in the bimetallic zeolite-based imidazolate framework (ZIF) and Mg(OH) 2 template, ultra-fine 2.7 nm PtCo-alloy with 2–3 atomic-layer Pt-skin nanoparticles are obtained. By adjusting the Co/Zn feeding-ratio in the bimetallic ZIF at 8/7, the alloying degree and nanoparticle size are optimized to achieve an outstanding oxygen reduction reaction activity with a high mass activity (MA) of 0.956 A mg Pt −1 in 0.1 m HClO 4 , about 7.5-fold of that of commercial Pt/C. Furthermore, notable durability is also achieved with 81% retention of the initial MA after 30k cycles conducted between 0.6–1.0 V (versus reversible hydrogen electrode). These features are also verified by a H 2 –Air fuel cell test with an excellent combination of mass activity, power density, and durability. This strategy provides a feasible route for the large-scale synthesis of highly-dispersed PtCo-alloy catalysts.
研究领域:
材料科学
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电化学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Fanfan Shang,Huijie He,Peng Li,Hairui Cai,Bei An,Xiaoqian Li,Shengchun Yang,Zhanbo Sun,Bin Wang
It is challenging to develop high-efficient and stable nonprecious metal-based electrocatalyst for oxygen evolution reaction (OER) in acid for proton exchange membrane (PEM) water splitting. Herein, P atoms were introduced into the lattice of spinel Co 3 O 4 (P-Co 3 O 4 ) to replace with octahedral coordinated Co 3+ via a hydrothermal process following a thermal treatment. The formation of PO 6 geometric configuration unit in Co 3 O 4 can trigger electron rearrangement around Co ions , which resulted in the high-active Co 2+ site on the surface, significantly decreasing the energy barrier of rate-determining step for OER. Moreover, the weaker covalency of the Co 3d-O 2p bond and higher formation energy of oxygen vacancy around Co 2+ in P-Co 3 O 4 inhibited the participation of lattice oxygen during OER process, enabling that P-Co 3 O 4 can work stably in acidic media. The obtained P-Co 3 O 4 afforded satisfying stability over 30 h in a PEM electrolysis device with an overpotential of 400 mV@10 mA/cm 2 in 0.1 M HClO 4 .
研究领域:
电化学
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催化
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材料科学
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能量转换与存储
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2023
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IF 16.5
Mingjia Lu,Lecheng Liang,Binbin Feng,Yiwen Chang,Zhihong Huang,Huiyu Song,Li Du,Shijun Liao,Zhiming Cui
The electronic conductivity and durability of porous carbon supports can be improved by increasing the degree of graphitization in the material; however, the preparation of highly graphitic porous carbon using conventional furnaces remains a significant challenge. Herein, we demonstrate a universal and highly efficient carbothermal shock strategy that significantly improves the degree of graphitization of porous carbon supports, including bowl-like carbon, hollow carbon spheres, ZIF8-derived carbon, BP2000, and Ketjen EC 300J. Taking bowl-like carbon as an example, we illustrate the synthesis of a graphitized bowl-like carbon (G-BC-S) support and evaluate the performance of PtCo/G-BC-S in the oxygen reduction reaction (ORR) in rotating disk electrodes (RDE) and H 2 /air PEM single cells. PtCo/G-BC-S exhibits faster ORR kinetics than PtCo/BC and Pt/C, with little loss of activity (25%) and only 13 mV of E 1/2 decay after 20000 cycles accelerated stress testing under 1.0–1.5 V vs . a reversible hydrogen electrode (RHE). The significantly enhanced performance of the PtCo/G-BC-S catalyst arises from the high activity and chemical/structural stability of the PtCo intermetallic nanoparticles and from the high degree of graphitization and well-defined porous structure of the bowl-like carbon support, which confers excellent electrical conductivity and oxygen transport properties. This study provides a reliable and universal strategy for the development of high-performance porous carbon supports for practical applications in fuel cells.
研究领域:
材料科学
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电化学
·
能源材料
·
催化
✓ 已验证
产品关联
DOI
高影响因子
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