CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Peng Wei,Yang Sui,Dong Huang,Bensheng Zhu,Xiaoyu Meng,Qiong Zhou
Sulfonated poly ether ether ketone (SPEEK) was used to fabricate proton exchange membrane (PEM) due to its adaptable proton conductivity. However, PEM cannot simultaneously enhance its conductivity and stability. To solve the problem mentioned above, phosphotungstic acid (HPW) with strong inherent proton conductivity was chosen to add to the SPEEK matrix, but it still faces the leaky problem. NH 2 -UiO-66 (NU6) with a large surface area and chemical stability was synthesized in situ on the surface of polyimide (PI) nanofiber to create NU6@PI nanofiber, which can be used to anchor HPW. Meanwhile, the stability of proton transport channel may be further enhanced by the sandwich structure, which may be advantageous for proton transport. The NU6@PI/SPEEK + HPW-20 exhibited a conductivity of 174.9 mS·cm −1 and a swelling ratio of 19 % at 60 °C and 100 % RH. After 6 weeks of testing, its conductivity decreased to 151.2 mS·cm −1 which was 24 % higher than that of SPEEK, while the swelling ratio increased to 31 % which was lower than that of SPEEK. The outcome demonstrates that the sandwich-structure NU6@PI/SPEEK + HPW membrane may really boost proton conductivity and stability at the same time. By using XPS and TEM, it is possible to confirm the acid-base interaction and acid-rich layer that exist at the interfaces of NU6@PI nanofiber and HPW/SPEEK matrix. After 6-weeks of usage, the sandwich-structure composite membrane with nanofiber at both the top and bottom of PEM can still maintain high proton conductivity and high stability, offering a novel research idea for resolving the issue that PEM cannot simultaneously achieve significant proton conductivity as well as elevated stability.
研究领域:
材料科学
·
化学工程
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Zuobo Yang,Xiaokuan Wu,Leilei Cai,Yaqi Cao,Zandong Zhang,Xin Teng,Chaoyang Li,Jiayi Wang,Jimmi Yun,Jie Zhang,Xin Liang,Hong Zhao
This study focuses on the development of high-performance and durable supported iridium-based catalysts. Mesoporous antimony tin oxide (ATO) supports with high conductivity, high specific surface area, and rich in oxygen vacancies is prepared by employing a Pt-catalyzed oxidation of carbon template removal approach. The pore sizes of mesoporous ATO supports are tuned from 5 to 12 nm by adjusting the template removal temperature. These supports, used for IrO 2 substrates, improved ultrahigh OER performance, both catalytic activity and mass transfer, demonstrated excellent Proton exchange membrane water electrolysis (PEMWE) performance with a 0.3 mg cm −2 of Ir loading, with a polarization performance of 1.75V@2A cm −2 . Simultaneously, the ATO-supported catalysts demonstrated outstanding performance even at ultra-low loadings owning to the ATO mesoporous structure and surface oxygen-vacancy, achieving 1.8V@2A cm −2 with an Ir loading of 0.05 mg cm −2 . Density functional theory (DFT) computations revealed the strong oxide-support interaction (SOSI) between the IrO 2 and ATO. This research not only validates the effective role of conductive ATO in supported iridium-based catalysts but also provides valuable guidance on the influence of support pore structure to the supported iridium-based catalysts. It offers a new perspective for the development of supported low-iridium OER catalysts.
研究领域:
电化学
·
催化
·
材料科学
·
纳米技术
·
能量转换
·
表面科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2025
·
IF 15.6
Jing Liang,Yuanyuan Zhao,Chenyu Yang,Shandong Zhu,Liang Wang,Ke Xu,Xueliang Mu,Yong Han,Zhi Liu,Zhiwei Zhao,Wei Liu,Fei Li,Zhangquan Peng,Edmund C. M. Tse,Qinghua Liu,Junfeng Gao,Qing Li,Jianfeng Li,Jinxuan Liu
Developing efficient, cost-effective, and durable electrocatalysts for proton exchange membrane water electrolysis (PEMWE) remains a significant challenge, requiring the stabilization and enhancement of catalyst activity under harsh conditions. Here, we present cobalt-doped ruthenium dioxide (Co0.3Ru0.7O2) on TiO2 as an electrocatalyst toward an acidic oxygen evolution reaction. The Co0.3Ru0.7O2–TiO2 achieves an impressive overpotential of 322 mV at 1 A cm–2 and demonstrates stable operation for over 1000 h at 500 mA cm–2 in a PEMWE device. Comprehensive experimental and theoretical calculation results demonstrate that the doping of Co atoms into the rutile RuO2 lattice optimizes the geometric configuration. Moreover, the lattice-matched interface between Co0.3Ru0.7O2 and TiO2 promotes interfacial electron redistribution and stabilizes active centers under oxidative conditions. This facilitates a dual-site fully parallel oxidation (DFO) pathway in which intermediates are synchronously adsorbed and desorbed at Ru and Co sites, enabling direct O–O coupling. This work highlights the synergistic effect of the Ru–Co dual sites and TiO2 support in establishing a stable, self-regulating electronic environment that drives efficient intermediate transformation via the DFO mechanism.
研究领域:
电催化化学
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材料科学
·
能源化学
·
纳米材料
·
表面科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Huijuan Bai,Jin Zhang,Haining Wang,Yan Xiang,Shanfu Lu
Poly(vinyl pyrrolidone) (PVP)-based high-temperature polymer electrolyte membranes (HT-PEMs) doped with phosphoric acid (PA) present an attractive prospect for high-temperature fuel cell. However, its proton conductivities and mechanical properties are inversely dependent on PVP content in membranes. Herein, chloromethyl-polysulfone is used as a polymeric crosslinker to fabricate cross-linked PVP. The effects of chloromethylation degree of polysulfone on PVP cross-linking degree, free volume and other parameters are studied. The quaternary amine groups introduced by cross-linking reaction enhances PA adsorption and retention capacity of membrane. The increased molar free volume created by polymeric crosslinker can accommodate more PA storage and reduce the polymer main chain plasticization. Thus, the mechanical properties of membranes are maintained. When compared to uncross-linked C-PVP-0/PA, the cross-linked C-PVP-13.7%/PA exhibits improved mechanical strength with increasement of 140% (4.5 MPa) and enhanced proton conductivity with increasement of 119% (120.0 mS cm −1 @160 °C). Also, these superior characteristics allow a significantly enhanced H 2 –O 2 fuel cell performance with the membrane of 724.9 mW cm −2 @160 °C, which has increasement of 50% in comparison with that of the C-PVP-0%/PA membrane, and excellent durability. These praiseworthy results suggest that the cross-linked membrane within moderately molar free volume is potential to act as HT-PEMs materials for real-world applications.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2016
·
IF 2.38
Baohua Yue,Guangbo Zeng,Yepei Zhang,Sheng Tao,Xiaoming Zhang,Liuming Yan
The synergetic proton conducting effect was observed in an acid-base composite composed of phosphonic acid functionalized polysulfone (PSF-PA) and triazolyl functionalized polysulfone (PSF-CH 2 -iPrOHTri), with three orders of magnitude improvement compared to that of the acidic or basic component. The maximum proton conductivity of 42.71 mS cm − 1 at 100 °C and 90% RH was observed in PSF-PA/PSF-CH 2 -iPrOHTri composite membrane composed of 75.0% PSF-CH 2 -iPrOHTri. In addition, the acid-base composite membrane showed higher thermal and oxidative stability , reduced hydrophilicity and methanol permeability , significantly improved mechanical strength . For the hydrated membranes of PSF-PA or PSF-CH 2 -iPrOHTri, the tensile strengths showed significant degradation with values only about halves of the dry membranes. On the other side, the tensile strength of the acid-base composite composed of 75.0% PSF-CH 2 -iPrOHTri showed only slight drop from 35.52 MPa to 30.59 MPa.
研究领域:
材料科学
·
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
Han Sun,Shuang Wang,Yinghe Cui,Zhipeng Yong,Dan Liang,Xiaodong Wang,Xiaorui Wang,Chenglong Li,Feng Pan,Zhe Wang
Branched polymers have unique three-dimensional dendritic structures, so they have received a lot of attention in the application of high temperature proton exchange membranes . In this work, we synthesize BOPBI-X (X = 3%, 6%, 9%) membranes with different branched ratios based on the synthesis of OPBI, due to the introduction of a rigid triazine structure with a larger free volume, the membranes could absorb more phosphoric acid (PA) while maintaining sufficient mechanical strength . Among them, the BOPBI-6% membrane obtains splendid comprehensive performance, when the PA doping level (ADL) is 9.55, it achieves a proton conductivity of 99.2 mS cm −1 at 180 °C, which is 1.8 times higher than OPBI (54.8 mS cm −1 ), and it performs well in long-term oxidation stability test after 144 h, it still has a mass retention rate of 90%. For the sake of further boost the performance of the membrane, cross-linkable polymeric ionic liquid (PIL) is introduced to the system. Among them, BOPBI-PIL-30% membrane has sufficient mechanical properties (5.50 ± 0.8 MPa), and the proton conductivity (146.9 mS cm −1 ) at 180 °C is also excellent, so BOPBI-PIL-30% membrane is expected to be a promising candidate as HT-PEMs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhenyu Chen,Jia Liu,Bin Yang,Mingjie Lin,Costas Molochas,Panagiotis Tsiakaras,Peikang Shen
Intermetallic ordered PtCo is effective for high oxygen reduction reaction (ORR) activity and stability. However, preparing small-sized, highly ordered PtM alloys is still challenging. Herein, we report a controlled two-stage confinement strategy, in which highly ordered PtCoZn/NC nanoparticles of 5.3 nm size were prepared in a scalable process. The contradiction between the high ordering degree with the small particle size as well as the atomic migration with the space confinement was well resolved. An outstanding PEMFC performance was achieved for L1 0 -PtCoZn/NC with a high mass activity (MA) of 1.21 A/mg Pt at 0.9 V iR-free , 80.1 % MA retention after 30 k cycles in H 2 -O 2 operation, and a high mass-specific power density of 8.24 W mg -1 Pt in H 2 -Air operation with a slight loss of cell voltage@0.8 A cm −2 of 28 mV after 30 k cycles. The high performance can be ascribed to the high Pt area exposure, the enhanced Pt-Co coupling, and the prevented agglomeration in the mesoporous carbon wall. Overall, this strategy may contribute to the commercialization of fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Yingfeng Wang,Jiabin You,Zhuowei Cheng,Kun Jiang,Linlin Zhang,Wanli Cai,Yun-Quan Liu,Shuirong Li
An improved sulfonated poly (ether ether ketone) (SPEEK) nanocomposite membrane was prepared by incorporating both phosphotungstic acid (HPW) and Al doped cerium-based oxides (Al-CeZrO4) in SPEEK matrix. The HPW was immobilized by Al-CeZrO4 so that firmly dispersed acid–base pairs were formed. The introduction of Al-CeZrO4 helped improve the chemical stability of the pristine (baseline) SPEEK membrane without compromising the conductivity, and the addition of HPW further enhanced the conduction of protons through acid–base interactions. Stability tests showed that when the SPEEK/Al-CeZrO4 nanocomposite membrane was immersed in a Fenton’s solution for 108 h at 80°C, a loss of 34.9% in proton conductivity was observed, which is 24.1% less than that of the pristine SPEEK membrane, indicating that the attenuation of membrane proton conductivity was inhibited. At the same time, the proton conductivity of the SPEEK/Al-CeZrO4/HPW nanocomposite membrane (that has already incorporated HPW) was increased by 15.5% compared to the SPEEK/Al-CeZrO4 nanocomposite membrane. Hence, Al-CeZrO4/HPW is considered as an effective inorganic nanofiller for improving both proton conductivity and chemical stability of SPEEK membranes, and the hybrid composite membrane is worth further studying.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 38
·32416-32426
·
IF 9.5
Runcheng Zhang,Zhuolin Yuan,Xutao Qiu,Zhiyan Rui,Xiaoyun Shi,Jia Li,Aidong Tan,Jianguo Liu
Proton exchange membrane (PEM) water electrolysis efficiency can be significantly enhanced by reducing the membrane thickness; however, this approach leads to excessive H2 permeation into O2 (HiO), causing serious safety hazards and accelerated degradation. This study presents a novel thin (about 60 μm) composite membrane incorporating Pt and CeO2 nanoparticles supported on carbon nanotubes (Pt-CeO2-CNT/Nafion) to address these challenges. The catalysts embedded in the membrane exhibit synergistic multifunctional effects at the microscopic level. CeO2 transfers electrons to Pt through metal–support interactions, enhancing the H2–O2 recombination activity. Oxygen vacancies in CeO2 effectively scavenge free radicals (H˙, HO2˙, HO˙, etc.). CNTs serve as stable anchoring sites, preventing Ceδ+ migration and membrane poisoning. At the macroscopic level, Pt-CeO2-CNT/Nafion maintains superior electrochemical performance with an electrolysis voltage of 1.746 V at 3.0 A cm−2. Meanwhile, the HiO concentration remains below 0.7% across all tested current densities, and the F− release rate decreases by 3.8-fold compared to Pt-CNT/Nafion during long-term operation, indicating improved safety and durability. This work provides both fundamental insights and practical strategies for developing next-generation thin PEMs suitable for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2026
·
IF 7
Junlin Cai,Pengfei Li,Hongpu Huang,Shupeng Wang,Yu Peng,Yuhang Peng,Qiuxiang Wang,Xiaohong Wang,Zhaoxiong Xie,Shuifen Xie
Defect-rich RuO2 catalysts, although possessing high electrocatalytic activity, are inherently unstable for the anode oxygen evolution reaction (OER) in proton exchange membrane water electrolysis (PEMWE) due to rapid lattice oxygen depletion. Here we report an atomically Ir-doped, grain-boundary-rich RuO2 catalyst (Ir-GB-RuO2) that suppresses overactivation of lattice oxygen by forming robust Ru–O–Ir bridging motifs at grain boundaries, achieving high-performance acidic OER electrocatalysis and ampere-level stable PEMWE. The induced electronic modulation shifts the catalytic mechanism from a pure lattice oxygen mechanism (LOM) to a balanced coexistence of LOM and the adsorbate evolution mechanism (AEM), thereby achieving robust stability while preserving high intrinsic activity. The primary Ir-GB-RuO2 catalyst requires only 191 mV overpotential to achieve 10 mA cm–2 and exhibits a prolonged durability exceeding 1000 h at 100 mA cm–2. In a PEM electrolyzer, it attains the current density of 1.0 A cm–2 at a notably low cell voltage (1.67 V) and exhibits a minimal potential decay rate of only 55.3 μV h–1 over 1500 h of continuous operation. This work overcomes the intrinsic activity–stability trade-off in defect-rich Ru-based catalysts for industrial PEMWE.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Guoxiang Wang,Taipu Chen,Dahui Fang,Jinkai Hao,Zhigang Shao
The development of highly active and stable catalysts of oxygen evolution reaction (OER) plays a crucial role in proton-exchange-membrane water electrolysis (PEMWE). Herein, an electronic modulate was used to fabricate oxygen defect-rich and supported metal catalysts AuIr/Nb 2 O 5-x , and it promoted the sluggish kinetics and low efficiencies of OER with the interaction between oxygen defects and the active sites. The Nb–O defect with an electron redistribution and manipulated active electronic state tailored the OER performance. The Ir actively exposed the AuIr/Nb 2 O 5-x -500 catalyst, which exhibited a low overpotential of 230 mV and maintained an excellent stability for 200 h at the current density of 10 mA cm −2 in 0.5 M H 2 SO 4 electrolyte. Furthermore, the PEMWE using AuIr/Nb 2 O 5-x -500 as the anode revealed a high water-splitting performance (1.61 V @ 0.5 A cm −2 & 1.70 V @ 1 A cm −2 ). In-situ Raman spectra and theoretical calculations revealed the electronic structure of AuIr/Nb 2 O 5-x -500 and the mechanism of OER processes, which rationalized the improved performance through the synergistic effect of metal–support interaction and defect effect.
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 3
·034522
·
IF 4.316
Zhenjie Chen,Tao Fu,Xiangbang Kong,Xingqiao Chen,Qi Yang,Jinbao Zhao,Bing Li,Jiangshui Luo
The fuel cells have outstanding advantages in the new energy application, but the membrane electrode assembly (MEA) of fuel cells is difficult to produce at low-cost and large-scale, which restricts their applications. To simplify the preparation of MEA, for the first time, we successfully develop a novel impregnation-reduction method combined with galvanic replacement to grow Ag/Pt bimetallic nanocatalyst onto a Nafion membrane (Nafion-Ag/Pt membrane), and the deposited Ag/Pt catalyst is very stable, which can be directly used as a novel ultra-thin catalyst layer in MEA. This novel method possesses mild conditions, simple procedure, good repeatability and practicability in a large-scale production. Moreover, a very low Pt loading amount of Nafion-Ag/Pt membrane can be achieved by regulating experimental conditions, which brings excellent Pt utilization. Therefore, the MEA made from Nafion-Ag/Pt membrane exhibits a Pt mass specific power (1.519 W mgPt−1) that is 12.3 times higher than that of a conventional MEA. These results demonstrate that this novel impregnation-reduction method can reduce the cost of fuel cells by reducing the difficulty of MEA preparation and the Pt loading amount of MEA and simultaneously enhancing its performance, which shows great potential in fuel cell application.
研究领域:
材料科学
·
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）