Small
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2024
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IF 13
Zequan Huang,Danyi Zhu,Mingjie Ma,Bing Zhao,Jiazhen Liang,Liang Zhang,Chao Chen,Mengjiao Liu,Congjie Gao,Fei Huang,Lixin Xue
The degradation of fixed cationic groups in most anion exchange membranes (AEMs) under alkaline environments limits their durability for alkaline water electrolysis (AWE). Ion-solvating membranes (ISMs) have emerged as a promising alternative to address this issue. Herein, a cationic group-free ion solvating membrane in a free-standing gel form (ISM-PBI-FG) is presented, created through a sol-to-gel transformation process followed by KOH imbibing. This approach yields a 3D porous microstructure composed of entangled polybenzimidazole (PBI) nanofibrils, achieving 89% porosity, which enables ultrahigh alkali uptake (346% in 6 M KOH) and exceptional ionic conductivity (763 mS cm −1 at 80 °C). The absence of cationic groups avoids the attack by OH − , thus ensures good alkaline stability with a conductivity retention rate of 91.6% over a 3120 h ex situ test in 6 M KOH. The resulting membrane delivered outstanding AWE performance with current densities of 5.5 A cm −2 using platinum-group-metal (PGM) catalysts and 2.2 A cm −2 using PGM-free catalysts at 2.0 V. Notably, the in situ electrolyzer device based on ISM-PBI-FG offers extensive operational flexibility ranging from 40–100 °C and demonstrates record durability in concentrated alkaline conditions, with a voltage decay rate of only 23.5µV h −1 , outperforming most reported AEMs and ISMs.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Lin Guan,Su Yan,Yangguang Zhu,Da Zhang,Lijin Xu,Xiao Wang,Gang Ao
The development of efficient oxygen evolution reaction electrocatalysts capable of operating at industrial-level current densities (1 A cm −2 ) remains a major bottleneck for clean energy. This work tackles this challenge by constructing three-dimensional FeCo alloy aerogels via a straightforward co-reduction strategy. The unique porous architecture of the optimized Fe1Co2 catalyst enables unparalleled electron and mass transport, registering merely 333 mV even under a high current density of 1 A cm −2 . Moreover, the Fe1Co2 product delivers an outstanding endurability of 120 h continuous voltage output under 1 A cm −2 . Similarly noteworthy is its mass activity, which reaches 226.1 A g −1 at an overpotential of 300 mV. This value exceeds those of commercial benchmark catalysts IrO 2 and RuO 2 by factors of 14.1 and 12.1, respectively. Furthermore, an electrolyzer assembled with Fe1Co2 as the anode and 40%Pt/C as the cathode operates at a lower cell voltage than systems employing noble-metal anodes, confirming its viability for industrial water splitting.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·369-379
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IF 10.733
Chun Li,Lingling Shi,Lili Zhang,Peng Chen,Junwu Zhu,Xin Wang,Yongsheng Fu
Organic two-dimensional (2D) materials with unique optic-electronic properties are attracting great interest for application in functional electronic devices. However, low electronic conductivity and poor stability still are major defects of 2D organic systems. Herein, we demonstrated ultrathin 2D conductive cobalt–hexaaminobenzene metal–organic coordination polymer nanosheets (Co–HAB-NSs) with a thickness of ∼4.5 nm. The as-prepared Co–HAB-NSs exhibit a low overpotential (310 mV @ 10 mA cm−2) and high durability in 1 M KOH. The experimental and computational results show that the high electrocatalytic activity is ascribed to the enhanced electrochemically active surface area as well as the dense and stable catalytic active sites of Co–HAB-NSs.
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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DOI
高影响因子
Chemical Science
·
2025
·
IF 7.4
Fengjiao Meng,Junsen Zhong,Xiaoqian Tan,Jian-Bo Cheng,Bo Xiao,Shengliang Zhang,Fuyi Jiang,Wenbao Liu,Wei Liu,L Kang
Electrochromic (EC) windows are receiving numerous attentions owing to their flexibly adjustable optical properties controlled by external bias. Nevertheless, the widespread commercialization of EC windows still faces substantial impediments including high cost, intricate fabrication process, slow switching times and especially poor durability. Herein, we propose a facile yet high-performance EC system based on the reversible electrodeposition of iodine, which is theoretically free of “ion-trapping”, structure degradation, dendrite growth and corrosion issues encountered by the traditional EC windows. To overcomes the polyiodide shuttle problem, the electrolyte is further modified with [EMIM]+, which can coordinate with the polyiodide intermediates to form insoluble [EMIM]I3, and thereby effectively suppress polyiodide formation and shuttling. Moreover, the preferential adsorption of [EMIM]+ on to the Zn counter electrode ensures uniform and stable Zn deposition/striping, synergistically improving the durability of the I2-Zn EC window. With these multifaceted merits, the austere EC system simultaneously achieves rapid response speeds (tcoloring: 7 s, tbleaching: 6 s), high optical modulation amplitude (89.6% at 500 nm), impressive coloration efficiency (44.8 cm2 C-1) and excellent lifetime (without performance attenuation after 10,000 cycles). The scaling potential of the device is further demonstrated by constructing a large-area (10 * 10 cm2) device.
研究领域:
材料科学
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电化学
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功能材料
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智能窗技术
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能源材料
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zuozhu Yin,Yi Cheng,Yuanting Deng,Zihao Li,Kaiyuan Liu,Min Li,Xiaoxiang Chen,Mingshan Xue,Junfei Ou,Sheng Lei,Yidan Luo,Chan Xie,Zhen Hong
Colorful superhydrophobic coating with high durability and versatility has been receiving tremendous attention in decorative applications. A one-step spraying method for fabricating colorful superhydrophobic nanocellulose-based membrane (CSNBM) with high durability, high-efficiency oil/water separation and oil spill cleanup is established by using octadecyltrichlorosilane (OTS), pigment dispersions and n-hexane. The color diversity and depth of the CSNBM are regulated by adjusting the dosage of pigment dispersions. Due to the stoichiometrically regulated reaction of long-chain organosilanes with water, which produces micro to nanoscale hierarchical siloxane aggregates dispersible in industrial solvents, the colorful coating securely clings to the NBM surface to form CSNBM. Even after several severe testing, this CSNBM is proven to be exceedingly resilient, with no substantial decrease in superhydrophobicity (pH soultion test, wear abrasion, blending test and UV irradiation). Furthermore, this CSNBM can be employed to create various colorful paintings. This CSNBM can also be used to separate diverse oil/water combinations with high efficiency. Moreover, this CSNBM had excellent anti-fouling properties in a variety of liquids, including water, orange juice, coffee, tea, milk, and cola. This strategy will pave the way for the huge potential application in technological design or decoration, as well as hasten their commercialization in near future.
研究领域:
材料科学
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环境工程
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表面化学
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DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Khan Karim,Tareen Ayesha Khan,Aslam Muhammad,Ali Khan Sayed,khan Qasim,Khan Qudrat Ullah,Saeed Muhammad,Siddique Saleemi Awais,Kiani Maryam,Ouyang Zhengbiao,Zhang Han,Guo Zhongyi
Since the last decades, non-precious metal catalysts (NPMC), especially iron based electrocatalysts show sufficient activity, potentially applicant in oxygen reduction reaction (ORR), however they only withstand considerable current densities at low operating potentials. On the other hand iron based electrocatalysts are not stable at elevated cathode potentials, which is essential for high energy competence, and its remains difficult to deal. Therefore, via this research a simple approach is demonstrated that allows synthesis of nanosize Fe-doped mayenite electride, [Ca 24 Al 28 O 64 ] 4+ ·(e − ) 4 (can also write as, C 12 A 7−x Fe x :e − , where doping level, x = 1) (thereafter, Fe-doped C12A7:e − ), consist of abundantly available elements with gram level powder material production, based on simple citrate sol-gel method. The maximum achieved conductivity of this first time synthesized Fe-doped C12A7:e − composite materials was 249 S/cm. Consequently, Fe-doped C12A7:e − composite is cost-effective, more active and highly durable precious-metal free electrocatalyst, with 1.03 V onset potential, 0.89 V (RHE) half-wave potential, and ~5.9 mA/cm 2 current density, which is higher than benchmark 20% Pt/C (5.65 mA/cm 2 , and 0.84 V). The Fe-doped C12A7:e − has also higher selectivity for desired 4e − pathway, and more stable than 20 wt% Pt/C electrode with higher immunity towards methanol poisoning. Fe-doped C12A7:e − loses was almost zero of its original activity after passing 11 h compared to the absence of methanol case, indicates that to introduce methanol has almost negligible consequence for ORR performance, which makes it highly desirable, precious-metal free electrocatalyst in ORR. This is primarily described due to coexistence of Fe-doped C12A7:e − related active sites with reduced graphene oxide (rGO) with pyridinic-nitrogen, and their strong coupling consequence along their porous morphology textures. These textures assist rapid diffusion of molecules to catalyst active sites quickly. In real system maximum power densities reached to 243 and 275 mW/cm 2 for Pt/C and Fe-doped C12A7:e − composite, respectively.
研究领域:
电化学
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材料科学
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催化
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能源材料
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）