APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Zhuangzhi Wu,Rongbin Zhang,Hao Fei,Ruoqi Liu,Dezhi Wang,Xinli Liu
The NH 3 is generally synthesized by the traditional Haber–Bosch method, which is energy-consuming and releases a lot of CO 2 . Electrocatalytic fixation of N 2 is highlighted as a carbon-free route to generate NH 3 by the nitrogen reduction reaction (NRR), but strongly demands highly efficient and durable electrocatalysts. Herein, we propose the multiphasic 1T@2H-MoSe 2 as a highly active NRR catalyst for the first time, which exhibits excellent activity for the NRR with a NH 3 yield of 19.91 ± 0.89 μg h −1 mg cat . −1 and a FE of 2.82% ± 0.1% at −0.6 V in 0.1 M Na 2 SO 4 . Moreover, a good durability is also demonstrated.
研究领域:
材料科学
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化学工程
·
催化科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Xin Dong,Xiaoli Cheng,Xianfa Zhang,Lili Sui,Yingming Xu,Shan Gao,Hui Zhao,Lihua Huo
The coral-shaped Dy 2 O 3 was prepared by a simple and environmentally friendly hydrothermal reaction combined with subsequent calcination. The coral-shaped Dy 2 O 3 was assembled by clusters, which were constructed by nanoparticles, whose sizes are 12.3 ± 3.6 nm. The gas sensors were investigated with nine gases at room temperature, and show a high response and selectivity to NH 3 . Compared with other reported metal oxide-based sensors, Dy 2 O 3 sensor exhibits not only high sensitivity, good selectivity and reproducibility to NH 3 at room temperature, but also two good linear relationships when the concentration of NH 3 is in the range of 0.1–1 ppm and 1–100 ppm. The good gas sensing property is mainly because of the 3D hierarchical structure of coral-like Dy 2 O 3 , which has a large specific surface area. This benefits NH 3 molecules to adsorb/desorb onto/from the surface as well as the electron transfer. In addition, the possible NH 3 -sensing mechanism is discussed in detail.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Enkang Fu,Yu Qiu,Huaichang Lu,Sijun Wang,Lishan Liu,Hanjun Feng,Yanxin Yang,Zizhan Wu,Yunlong Xie,Feng Gong,Rui Xiao
Ammonia (NH 3 ) has been regarded as an attractive energy source for hydrogen production via catalytic decomposition , especially over non-noble metal catalysts . Owing to the decent performance and low cost, nickel (Ni) based catalysts have been widely studied for catalytic decomposition of NH 3 where the decomposition rates, can be further tailored by adding other metals. Herein, we synthesized bimetallic M(M = Co, Fe, Cu)Ni/Al 2 O 3 catalysts delivering superior catalytic performance at a wide temperature range of 350–750 °C. Co-Ni/Al 2 O 3 demonstrated nearly 100% conversion of NH 3 decomposition to H 2 at 700 °C and the gas hourly space velocity of 30,000 ml g −1 min −1 , which was ~20.85% higher than that of intrinsic Ni/Al 2 O 3 . The structural characterizations indicated that Co could decrease the particle size and enhance the dispersion of active sites. The density functional theory calculations substantiated that the associative decomposition of N to generate N 2 was the rate-determining step of the NH 3 decomposition reactions . NH 3 Temperature Programmed Desorption (TPD) results suggested that the enhanced catalytic performance was predominantly attributed to the Co that decreases the energy barrier for the associative decomposition of N to form N 2 . This study provides new insights in designing diverse catalysts for efficient NH 3 decomposition for controllable H 2 production.
研究领域:
催化化学
·
能源材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Anye Shi,Huihui Li,Shu Yin,Zaili Hou,Jiayue Rong,Jiachi Zhang,Yuhua Wang
Cs x WO 3 nanorods can be used to sensitize the single layer g-C 3 N 4 , where full spectrum light harvesting excited electrons to drive the photocatalytic reduction of N 2 into NH 3 . Under UV light, both water splitting and solar ammonia synthesis reaction exhibit high activity. However, selectivity towards ammonia over hydrogen is realized under NIR irradiation. With the control of methanol, O 2 can directly decide the NH 3 or H 2 evolution on photocatalyst. The origin is the strong capture of O 2 with the electrons from the photocatalyst under light irradiation to yield the oxygen active species, which transfer electrons subsequently with help of methanol to generate NH 3 . However, H 2 production will be suppressed by O 2 . And with its sacrifice, methanol preserves the produced NH 3 from oxidation. The O 2 -sacrificial agent mediated NH 3 evolution reaction found here provides insights in the promotion role of them in other catalysis.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Linghong Xue,Fan Zhang,Jiale Dang,Yu Zhang,Xu Li,Tong Liu,Qingji Wang
The room temperature gas sensor has attracted sufficient attention due to the fact that low-power products are more suitable for practical environments. However, developing gas sensors with low detection limits remains challenging. In this paper, a room-temperature sensor was prepared by in situ growth of WO 3 nanospheres on SnO 2 inverse opal (IO) by aerosol assisted chemical vapor deposition (AACVD) method, detecting ppb level of ammonia. The WO 3 nanospheres are directly fabricated on IO, and their elemental composition, morphology and structure is characterized using XRD, SEM and TEM. The results show that WO 3 nanospheres have been prepared on SnO 2 IO successfully. It showes that the WO 3 /SnO 2 (WS) type sensor has a detection limit as low as 1 ppb at room temperature from the gas sensitivity data. In addition, the sensor's response value to 100 ppm NH 3 reached 65 %. Its excellent sensing performance depends on the distinctive morphology features of WO 3 and SnO 2 . The hierarchical characteristic effectively enhances the sensing performance for NH 3 . Consequently, this presents a feasible solution for fabricating the room temperature NH 3 sensor.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Jiazi Shi,Chen Liu,Meichen Lin,Yabo Fu,Diangang Wang,Jing Song,Gaimei Zhang,Hui Liu,Lanlan Hou
In this work, graphene oxide (GO) nanosheets modified with TiO 2 nanoparticles were prepared by a simple solution ultrasonication method. The GO/TiO 2 nanocomposites were successfully synthesized by in-situ oxidation of Ti 3 C 2 T x nanosheets on the surface of GO nanosheets . It is revealed that spindle-shaped TiO 2 nanoparticles are uniformly distributed on the GO nanosheets, which will provide more active sites for NH 3 adsorption. The response of NH 3 sensor based on GO/TiO 2 nanocomposites to 100 ppm NH 3 at room temperature is approximately twice that of pure GO, which may be attributed to its unique structure and GO/TiO 2 heterojunction . The GO/TiO 2 sensors also demonstrated good stability, ideal repeatability, great selectivity , and a quick response/recovery time of 13/33 s. Lastly, density-functional theory (DFT) was used to examine the adsorption behavior and charge transfer capacity between NH 3 molecules and the materials. The results indicate that the GO/TiO 2 nanocomposites are potentially useful materials for highly sensitive NH 3 detection at room temperature.
研究领域:
材料科学
·
化学
·
传感器技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Yang Zheng,Minghao Liu,Hui Wang,Rui Mao,Zuoqiao Zhu,Ningtao Zhang,Wei Su
Conventional carbon capture technologies often suffer from high energy demands during the desorption stage, whereas mineralization-assisted desorption provides a promising alternative to mitigate this challenge. This study investigates the mineralization-regeneration process of the NH 3 –CO 2 absorption system, with particular emphasis on the influence of CaCl 2 on desorption performance and the underlying reaction mechanisms. The work further examines the phase transition behavior and doping regulation of calcium carbonate, and introduces steel slag as a practical calcium source to evaluate its feasibility for large-scale applications.Results indicate that the desorption efficiency of the NH 3 –CO 2 absorption system is strongly dependent on the calcium dosage and reaction temperature. At a CO 2 /Ca 2+ molar ratio of 1.0:1.0, pH 9, and a reaction temperature of 25 °C, the desorption rate reached 93.55%. The purity of the mineralized calcium carbonate exceeded 99.84%. Moreover, in the presence of NH 3 and Mg 2+ , a distinct crystalline phase transition pathway was identified. Without Mg 2+ , the transformation proceeded along the aragonite → calcite pathway, whereas higher Mg 2+ concentrations (molar ratio of 0.4) promoted the formation of clustered calcite structures. The leachate reacted with the NH 3 –CO 2 absorption solution to achieve a desorption rate of 80.50%, producing calcium carbonate with 98.74% aragonite content, and demonstrating superior stability compared to the CaCl 2 -based system over multiple cycles. Collectively, these findings confirm the viability of indirect mineralization-assisted desorption in the NH 3 –CO 2 absorption system and highlight the potential of industrial solid wastes, particularly steel slag, as alternative calcium sources for carbon capture applications.
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高影响因子
Molecular Catalysis
·
2026
·
IF 4.3
Kang Cheng,Yuting Hu,Tianyu Liu,Ting Cheng,Taotao Liu,Chengzhu Zhu
MOF derivative (Zr (0.9)/CuO x (400)) had excellent denitrification activity, N 2 selectivity and stability. • Systematically revealed the regulation mechanism of Zr doping on the Cu 2+ /Cu + ratio and acid balance. • Proved that Zr doping could act as sacrificial sites to greatly improve the H 2 O and SO 2 resistance of the catalyst. Zr/CuO x composite were synthesized by hot-solvent and calcination method using metal-organic framework (MOF) as the precursor, and were applied for selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). The effects of Zr/Cu molar ratio, calcination temperature and time on catalyst activity and the physicochemical properties of the composites were systematically investigated. The results showed that Zr/CuO x composite revealed a favorable denitrification activity, stability and resistance to sulfur and water while Zr/Cu molar ratio was 0.9 and calcination temperature was 400 °C. When the NO concentration of 500 ppm and gas hourly space velocity (GHSV) of 35,000 h -1 , NO conversion efficiency was achieved 100% and over 94% N 2 selectivity at 275–375 °C. In the presence of 100 ppm SO 2 and 10 vol% H 2 O, the NO conversion of Zr (0.9)/CuO x (400) approached 92%. The enhanced activity was attributed to a synergistic Zr/Cu interaction that optimized the surface Cu 2+ /Cu + redox couple, enriched Cu + sites, and thereby accelerated the low-temperature “fast” SCR pathway. Moreover, doping Zr generated a larger number of well-dispersed acid sites and maintained strong reducibility across a broad temperature range, collectively providing favorable conditions for the NH 3 -SCR. Download: Download high-res image (230KB) Download: Download full-size image
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Jie Yang,Xinyu Li,Shuai Lyu,Shan Wang,Zhichao Chen,Junjiang Zhu
The key to optimizing cerium-based mid-low temperature NH 3 –SCR catalysts lies in elucidating the respective roles of Lewis acid sites (LAS) and Brønsted acid sites (BAS). Herein, a highly dispersed cerium-loaded ZrO 2 catalyst (Ce/Zr) with well-defined LAS and BAS was prepared to investigate their roles in the NH 3 –SCR reaction using in situ DRIFTS, transient DRIFTS coupled with mass spectrometry, operando modulation excitation (ME) DRIFTS, and isotopic 18 O 2 labeling. Experimental results demonstrate that the NH 3 –SCR reaction obeys Eley–Rideal mechanism, in which gas-phase NO reacts with surface adsorbed NH 3 . Both NH 3 adsorbed on LAS (L−NH 3 ) and NH 3 adsorbed on BAS (B−NH 3 ) can be consumed during the reaction. L−NH 3 directly reacts with NO to form N 2 , whereas BAS participates indirectly by adsorbing and transferring NH 3 to LAS, thereby acting as an NH 3 reservoir. Transient half-cycles experiments combined with 18 O 2 labeling reveal that O 2 reoxidizes Ce and drives NH 3 migration from BAS to LAS, regenerating reactive L–NH 3 . Density functional theory calculations further confirm that NH 3 transfer from BAS to LAS proceeds without an energy barrier. These findings reveal a redox-coupled NH 3 transfer mechanism and provide theoretical guidance for the design of efficient Ce-loaded SCR catalysts.
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DOI
高影响因子
RARE METALS
·
2026
·Vol. 45
·期 6
·e70378
·
IF 12.1
Tao Wen,Xiaohan Chen,Honglin Hu,Xiteng Yan,Krongthong Kamonsuangkasem,Gang Feng,Rongbin Zhang,Runping Ye,Sibudjing Kawi
en This link goes to a English section zh This link goes to a Chinese section Catalytic NH 3 decomposition has garnered substantial attention for hydrogen transformation and storage. Ni-based catalysts continue to suffer from limited thermal stability and suboptimal low-temperature activity, largely attributed to an incomplete understanding of the structure-activity relationships and reaction mechanisms governing their performance. In this study, we designed and constructed a novel Y-Mg bimetallic oxide support system to synergistically modulate the properties of Ni-based catalysts for NH 3 decomposition. Unlike conventional Ni/MgO or Ni/Y 2 O 3 , the precisely tuned Y/Mg ratio in the 20Ni/YMg 8 catalyst creates a unique interface that couples the structural and electronic advantages of both components. A series of Ni-based catalysts with varying Y/Mg ratios was synthesized, and the 20Ni/YMg 8 catalyst with a 1:8 ratio of Y: Mg achieved a hydrogen production rate of 29.77 mmol g cat −1 min −1 at 600°C. Characterizations revealed that Mg incorporation primarily increased surface area and refined Ni dispersion, whereas Y enhanced reducibility and active metal distribution. More importantly, their synergy optimally tailors the electronic structure of Ni and the distribution of basic sites, which collectively promote *NH 2 formation and accelerate N 2 desorption—the rate-determining step. Mechanistic studies confirmed that the optimized catalyst promoted *NH 2 formation and accelerated N 2 evolution, indicating enhanced NH 2 activation and dehydrogenation. This study presents a rational design approach of bimetallic supports to modulate structural and surface properties, offering valuable insights into the development of efficient and stable Ni-based catalysts for ammonia decomposition. 摘要 en This link goes to a English section zh This link goes to a Chinese section 氨催化分解因其在氢能转化与储存方面的潜力而备受关注。镍基催化剂仍面临热稳定性不足和低温活性欠佳的挑战,这主要归因于对其构效关系及反应机理的认识尚不完善。本研究中,我们设计并构建了一种新型的Y-Mg双金属氧化物载体体系,以协同调控镍基催化剂的氨分解性能。与传统的Ni/MgO或Ni/Y 2 O 3 催化剂不同,20Ni/YMg 8 催化剂中精确调控的Y/Mg比例形成了一种独特的界面,耦合了两种组分的结构优势与电子优势。通过合成一系列不同Y/Mg比例的镍基催化剂,我们发现Y:Mg比例为1:8的20Ni/YMg 8 催化剂在600°C时达到了29.77 mmol g cat −1 min −1 的产氢速率。表征结果显示,Mg的引入主要增加了比表面积并优化了Ni的分散性,而Y则增强了还原性和活性金属分布。更重要的是,二者的协同作用精准调控了Ni的电子结构和碱性位点分布,共同促进了NH 2 的形成并加速了N 2 脱附(速率控制步骤)。机理研究证实,优化后的催化剂促进了 NH 2 的形成并加快了N 2 的生成,表明NH 2 的活化和脱氢过程得到增强。本研究为双金属载体的理性设计以调控结构及表面性质提供了新思路,为开发高效稳定的氨分解镍基催化剂提供了重要见解。
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Shufeng Ma,Zhongli Liu,Qianru Meng,Shiqiang Ouyang,Yueming Hu,Feijie Wang
During meat spoilage, microorganisms rapidly proliferate and decompose nitrogen-containing compounds such as proteins, releasing volatile alkaline substances, including ammonia (NH 3 ). Among these, NH 3 is widely recognized as a key indicator gas for evaluating changes in food freshness. To enable real-time monitoring of perishable food quality, this study developed an integrated self-powered smart material system based on cellulose nanofibers (CNF) with combined sensing and power-generation functions. Ti 3 C 2 T x was used as the NH 3 -sensitive functional filler, and a Ti 3 C 2 T x /SnO 2 heterojunction was formed by introducing SnO 2 , enabling synergistic enhancement of both NH 3 sensing sensitivity and triboelectric output performance. In addition, a TEOS-induced cross-linked network was introduced to enhance the structural stability and electrical performance of the composite film. The results show that the device achieves a triboelectric open-circuit voltage (Voc) of 82 V and a maximum instantaneous power density of 7.99 μW·cm −2 . It exhibits a stable linear response over the NH 3 concentration range of 5–120 ppm, with response and recovery times of 14 s and 32 s, respectively, and maintains good long-term stability over 20 days. Within the ppm-level concentration range relevant to meat spoilage, the sensor maintains continuous and distinguishable response signals under varying humidity conditions, enabling trend identification and dynamic monitoring of freshness changes. Furthermore, pork storage experiments demonstrated that the system could continuously track NH 3 release and effectively distinguish freshness changes under storage conditions of 20 °C, 4 °C, and − 20 °C, highlighting its significant potential for self-powered intelligent food packaging applications.
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Yanzheng Zhao,Tao Zhang,Hao Huang,Zhiguang Xu,Tieling Xing,Yan Zhao
Although pH indicator-based, chromic fabrics are advantageous for monitoring the pH of aqueous solutions, they usually require a long time to respond to acidic or alkaline gases. Endowing hygroscopicity to such fabrics could significantly shorten the response time to gas, but moisture-absorption-driven color changes tend to decrease their reliability. Herein, we report the fabrication of hydrophobic-hygroscopic, pH indicator-based chromic fabric coatings with humidity tolerance for rapid colorimetric NH 3 sensing. The fabric coatings were fabricated by grafting a polymerizable pH indicator (cresol red), hygroscopic monomer, and hydrophobic monomer onto cotton fabrics. The resulting fabrics exhibited opposing hygroscopicity and hydrophobicity. Hydrophobicity, reflected by high water contact angles up to 139.4°, prevented color change induced by various aqueous solutions, and hygroscopicity, with moisture absorption capacity up to 11.3 %, did not have an influence on color change, with color preserved in all relative humidity ranges. After moisture absorption, the fabrics possessed a remarkable color change from yellow to purple upon exposure to alkaline gases (such as NH 3 ), and the color change could be realized within 5 s. The color change was reversible, and a reusability over 10 cycles was confirmed without obvious deterioration in color change. The simple fabrication, hydrophobicity-hygroscopicity, and rapid response to NH 3 via visual color change make the fabrics an excellent candidate for rapid NH 3 sensing and food spoilage monitoring via changes in color.
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高影响因子
危险品化学品经营许可证（带存储）