ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Rong Zhao,Zheyuan Wang,Qingli Xu,Xiaopo Niu,Yunxi Han,Yue Qin,Qingfa Wang
Developing highly active and stable electrocatalysts for acidic oxygen evolution reaction is still a great challenge. Herein, we developed a novel self-supported amorphous IrO x catalyst (IrO x /Ti) encapsulated with a small number of crystalline nanoparticles for efficient acidic OER. The resulting IrO x -50-AC/Ti electrode exhibits a superior OER performance with an overpotential of 250 mV at 10 mA cm −2 and Tafel slope of 50.4 mV dec −1 in 0.1 M HClO 4 . High contents of Ir III species and surface hydroxide groups, hierarchically porous structure and high defective density contribute to boost the OER activity. Importantly, the amorphous IrO x -50-AC/Ti also demonstrates a super long-term durability for 190 h due to the strong interaction between IrO x film and Ti. The unique amorphous-crystalline structure also enhances the stability and the activity by promoting the synergy between amorphous phase and crystalline phase. This work provides some valuable insights on developing efficient Ir-based catalysts for acidic water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yong Zheng,Lufeng Wang,Fulan Zhong,Guohui Cai,Yihong Xiao,Lilong Jiang
As a class of natural clay minerals, the special surface characteristic of the negatively charged outer surface and the positively charged inner lumen enables halloysite to be of potential interest for catalytic applications. In this work, thermal treatment and modification with cetyltrimethylammonium bromide made the outer surface of halloysite hydrophobic, which resulted in the selective loading of palladium on the hydrophilic inner surface of halloysite. The designed site-oriented loading endowed catalysts with the desired structure and favorable properties for methane combustion. Because of the uniformly dispersed palladium particles (ca. 2 nm), a suitable ratio of Pd2+/Pd4+, better reducibility, and appropriate surface acidity, the tailored catalyst exhibited a remarkably higher activity with the T99 decreasing from 620 °C (unmodified catalysts) to 425 °C. More importantly, the stabilized palladium species could resist sintering and the diminishing of hydroxyl groups on the surface weakened the interaction with water, invoking an excellent long-term/cyclic stability and water resistance for methane combustion.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yanyan Duan,Gen Zhao,Xiaotao Liu,Jiale Ma,Shuyao Chen,Yanlin Song,Xiaodong Pi,Xuegong Yu,Deren Yang,Yiqiang Zhang,Feng Guo
High power conversion efficiency (PCE) and good long-term stability are everlasting pursuit for perovskite solar cells. We present here CsPbBr 3 perovskite film deposited by vacuum co-evaporation of CsBr and PbBr 2 . By optimizing evaporation rate ratio of the two precursor and annealing temperature, perovskite films with large grain and high crystallinity are obtained. Furthermore, by regulating spinning speed of TiO 2 precursor solution and thickness of CsPbBr 3 film, a best PCE of 9.43% is recorded under 100 mW cm −2 illumination, providing a significant enhancement in contrast with 6.26% of device based on spin-coating method. Additionally, the PCE of resulting perovskite solar cell without encapsulation remains at 96% of initial value after storing for 480 h under humidity of 40% in air. Our findings in this work deliver an effective strategy to fabricate high-performance inorganic perovskite solar cells.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ziyu Qin,Chao Ouyang,Jian Zhang,Li Wan,Shimin Wang,Changsheng Xie,Dawen Zeng
Recently, Tungsten disulfide (WS 2 ) nanosheets are widely used for room-temperature NH 3 sensing. However, the lower sensitivity and the microstructural instability severely limit its potential application. Here, few- or mono-layer WS 2 nanosheets decorated with different amounts of TiO 2 quantum dots (QDs) were successfully prepared for room-temperature NH 3 sensing. The gas sensing studies revealed that the nanohybrids exhibited significantly enhanced sensitivity to NH 3 at room temperature. The response of nanohybrids with the optimal molar ratio to 250 ppm NH 3 is nearly 17 times higher than that of the pristine WS 2 . Especially, the TiO 2 QDs decorated WS 2 nanohybrids showed almost no decline in sensitivity after several testing cycles, indicating the long-term stability of the nanohybrids-based sensing materials. The sensing mechanism based on the largely enhanced sensitivity and the long-term stability of nanohybrids also discussed in detail. It was believed that the largely enhanced sensitivity was attributed to the effective electron transfer between the WS 2 and the TiO 2 QDs through S O Ti bonding, which was confirmed by XPS analysis. We hope that this work could help us to further understand the QDs sensitization mechanism and could provide a guideline to explore more transition metal dichalcogenides-based gas sensors with even higher sensing performances.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Rongli Zhang,Guoya Wei,Chunhui Luo
Conductive hydrogels (CHs) were widely applied in actuating, sensing, health monitoring, etc. However, their applications in aquatic environments faced challenges, due to the excessive swelling and poor underwater adhesion. To address this issue, it was necessary to combine anti-swelling, adhesion, and long-term usability into one strain sensor. Hence, bilayer-structured CHs with stable sensing properties both in water and on land were developed via radical copolymerization of 2-hydroxyethyl methacrylate (HEMA) and L-serinyl acrylate-copper complex (LSA) to form an anti-swelling yet conductive matrix, followed by painting the adhesive layer of gelatin-tannin acid at the bottom. Because of the Cu2+ ions, it achieved ion conductivity, while the strong interaction between Cu2+ and carboxylic acid (-COOH)/amine (-NH2) groups stabilized Cu2+ ions and retarded leakage of conductive components. Due to the delicate balance of hydrophilic hydroxyl groups and hydrophobic backbones, the hydrogel displayed excellent swelling-resistance (with a swelling ratio of approximately 20%, tensile stress of 215 kPa, tensile strain of 180%, and conductivity of 17.9 mS/m) even after immersing in water for a month. Meanwhile, the hydrogel maintained robust adhesion (15 kPa) in aquatic environments for a month. Strain sensors based on the bilayered hydrogel exhibited linear sensitivity in monitoring human motions both on land and underwater, and enabled information transmission through the Morse code. Consequently, this strain sensor holds significant potential in underwater wearable devices.
研究领域:
材料科学
·
生物医学工程
·
柔性电子器件
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Kaifeng Wang,Ran Mao,Rui Liu,Juanjuan Zhang,Xu Zhao
The electrocatalytic reduction of nitrate (NO 3 − ) to ammonia (NH 4 + ) and further oxidation to N 2 via active chlorine is an effective method for denitrification. High activity, NH 4 + –N selectivity and long-term stability of a cathode are essential for the application. Herein, we reported a sulfur-modified Fe foam (FeS x @FF) cathode, which achieved high NO 3 − –N conversion (94.96%) and NH 4 + –N selectivity (82.29%) due to its enhanced electron transfer, atomic hydrogen (H*) generation, and adsorption of NO 3 − . Combined in-situ differential electrochemical mass spectrometry and theoretical calculations reveal that the ultrafast *NO 3 reduction to *NO 2 and low formation energy of *NO are crucial in reduction of *NO 3 to *NH 3 . The FeS 0.2 @FF cathode for realistic industrial wastewater (∼350 mg L −1 NO 3 − –N) treatment shows high TN removal (90.75%) and N 2 selectivity (98.88%) with an ultralow electrical cost (∼0.22 kWh g −1 N). This designed system has potential for efficient NO 3 − removal in the saline wastewater.
研究领域:
环境科学
·
电催化
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2025
·
IF 8.5
Jia Ke,Zhang Yanan,Zuo Rui,Lu Hongbing,Ji Kemeng,Chen Mingming
The sluggish bidirectional conversion rate between Li 2 S n (2 ≤ n ≤ 4) and Li 2 S, coupled with the uncontrolled deposition of Li 2 S, significantly impedes the realization of high-performance lithium–sulfur batteries (LSBs). In this study, a metal–organic framework was employed as a precursor for the synthesis of a CoO x –CeO 2− y /C (0 < x < 3/2, 0 < y < 1/2) heterojunction via pyrolysis, which was subsequently introduced onto the cathode side of the polypropylene (PP) separator in LSBs. The modification of CoO x –CeO 2− y /C enhances the kinetics of converting of Li 2 S n to Li 2 S during the discharge process. The Tafel slope for the Li 2 S deposition reaction is reduced to 52.1 mV/dec, representing a 56.6% decrease compared to LSBs with bare PP separator. Conversely, during the charging process, the modification lowers the energy barrier for the Li 2 S decomposition reaction, with the activation energy reduced to 6.12 kJ/mol, indicating a 70.3% decrease relative to LSBs with PP separator only. Consequently, more Li 2 S is promoted to undergo decomposition. The CoO x –CeO 2− y /C heterojunction facilitates uniform deposition of Li 2 S, featuring fine particles and a uniform distribution, after brief potentiostatic charging for decomposition, thereby effectively mitigating the deactivation of sulfur species. Thanks to the enhanced bidirectional conversion of lithium polysulfides (LiPS) facilitated by the CoO x –CeO 2− y /C modification layer, the (−)Li|CoO x –CeO 2− y /C@PP|S(+) coin cell maintains a Coulombic efficiency of 90.4% after 500 cycles at a current density of 1 C, exhibiting a low capacity-decay rate of only 0.081% per cycle, thereby demonstrating excellent long-cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Shixiang Zhou,Li Yao,Hui Mei,Mingyang Lu,Laifei Cheng,Litong Zhang
As the operation reliability for gas sensors under complex environments is in increasing demand, the stability and safety performance are significant besides qualified gas sensing properties. In this work, structural-strengthened and self-protective ammonia sensing micro-tunnels were constructed by 3D printing . Modified methyl-silsesquioxane (MK) resin was employed as the feedstock to build the SiOC honeycomb structures . Polypyrrole (PPy) nanoparticle decorated TiO 2 arrays sensitized the structures to form inner gas-sensitive tunnels . The sensing structure exhibited high selectivity toward ammonia at room temperature. Response to 50 ppm NH 3 was 18.67%, while the response and recovery times were 119 and 86 s, respectively. The excellent long-term stability also ensured reliable operation in complex environments. More importantly, the enhanced honeycomb had an outstanding mechanical performance with the compressive strength , Young's modulus , and energy absorption of 33.72 MPa, 2.40 GPa, and 28.22 kJ/m 3 , respectively. It can serve as a load-bearing part of the fundamental component to avoid catastrophic collapse while maintaining a regular sensing capability under pressure loading as the excellent deformation resistance ensured the integrity and connection of the sensing layer. Moreover, the inner through-holes facilitated the exposure of the sensing tunnels to the atmosphere, which can detect target gas simultaneously without the embedding of extra sensors. Thus, the construction of self-protective gas sensing structures was promising to be an efficient strategy for reliable gas detection in extreme environments.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Journal of Bionic Engineering
·
2021
·Vol. 18
·期 4
·887-899
·
IF 2.682
Tian Yanling,Feng Jiekai,Cai Zexin,Chao Jiaqi,Zhang Dawei,Cui Yuxiao,Chen Faze
Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival. Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation. However, further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment. Herein, we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh (SSCM). The prepared SSCM possesses excellent water repellence and oil affinity, enabling it to successfully separate various oil-water mixtures with high separation efficiency (e.g., > 99% for hexadecane-water mixture). The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures, indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh. Additionally, the efficiency can be well maintained during 50 cycles of separation, and the water repellence is even stable after storage in air for 120 days, demonstrating the reusability and long-term stability of the SSCM. Furthermore, the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper, and oil-water separation efficiency of > 96% can be obtained after 10 cycles of abrasion. The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh, and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiaoyu Li,Yujia Han,Yike Huang,Jian Lin,Xiaoli Pan,Ziang Zhao,Yanliang Zhou,Hua Wang,Xiaofeng Yang,Aiqin Wang,Lin Li,Botao Qiao,Xiaodong Wang
Selective methanation of CO (SMET) is promising for deep removal of low-concentration CO in excess H 2 . However, the development of suitable catalysts applied in practical conditions remains a great challenge. Here we report a general strategy to develop highly efficient SMET catalysts by using hydrogenated TiO 2 (H-TiO 2 ) as support. The H-TiO 2 supported Ru catalysts can remove CO to below 10 ppm with greater than 50 % selectivity in a wide temperature range of 200−265 °C, with a good long-term stability. Detailed characterizations including operando spectroscopy and in-situ XPS combined with DFT calculation revealed that the lowered Ru valance on H-TiO 2 strengthens CO adsorption on both metal surface and metal-support interface which improved CO activation and inhibited CO 2 hydrogenation, respectively, leading to enhancement of both activity and selectivity.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 17
·2376-2382
·
IF 4.446
Gang Yuan,Xiaopo Niu,Zhichao Chen,Li Wang,Xiangwen Zhang,Qingfa Wang
Graphical Ni 3 S 2 acts as a noble catalyst : A 3D porous, defect rich, and self-supported Ni 3 S 2 @Ni foam with core-shell structure is fabricated as electrocatalyst for methanol fuel cells. The electrocatalyst shows Pt-like activity, high poison tolerance, and long-term stability towards methanol oxidation in alkaline media. Direct methanol fuel cells are promising renewable energy devices for automobiles and portable electronic devices. The development of high effciency, poison tolerance, long-term stability, and noble metal-free electrocatalysts for methanol oxidation is still a major challenge. Herein, we develop a noble metal-free, 3D self-supported, defect-rich, hierarchical shell-core structured Ni 3 S 2 composite on Ni foam as electrocatalyst. This electrocatalyst shows a good activity, poison tolerance, and long-term durability towards methanol oxidation in alkaline media. It shows the lowest onset potential (−340 mV vs. Hg/HgO) among all the Ni-based catalysts reported up to date and a Pt-level specific activity. The methanol oxidation peak current of the electrocatalyst retains more than 97.5 % even after 5,000 voltammetry cycles in 0.5 M KOH+1 M CH 3 OH. The morphology and composition of the electrocatalysts before and after stability test were characterized by SEM, TEM, XRD, and XPS. The high activity, poison tolerance, and stability are attributed to the binder-free, directly grown Ni 3 S 2 shell on the Ni foam backbone, the lattice defect sites, and the synergetic effects between the in-situ formed active NiO x core and Ni 3 S 2 shell during methanol oxidation. This work indicates that the self-supported hierarchical shell-core Ni 3 S 2 @Ni foam electrocatalyst is a viable alternative for commercial Pt-based electrocatalyst applied in fuel cells.
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
NANO LETTERS
·
2021
·
IF 11.189
Chen Li,Shuai Zhou,Jing Nie,Jie Huang,Xiaoping Ouyang,Qiang Xu
Because of the extraordinary properties including high atomic numbers and large μτ products, metal halide perovskites have been widely employed and used for radiation detecting. Cs4PbI6 material has a high X-ray attenuation coefficient and excellent electrical properties that have a good potential in X-ray detection applications. Here, we have designed a flexible polymer-encapsulated Au/Cs4PbI6/Au X-ray detector with outstanding sensitivity of 256.20 μC Gy–1 cm–2 irradiated by 30 keV X-ray at 10 V bias, long-time stability, and durable flexibility without obvious degradation after bending for 600 cycles. These features demonstrate that this polymer-encapsulated durable flexible and sensitive X-ray detector could open a new possibility for next-generation radiation applications in dosimeter, imaging technologies.
研究领域:
材料科学
·
医学影像
·
辐射探测技术
✓ 已验证
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）