SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chuntian Tan,Feihong Wang,Kai Lv,Yangyang Shi,Binbin Dong,Luyuan Hao,Liangjun Yin,Xin Xu,Yuxi Xian,Simeon Agathopoulos
Developing a highly efficient, cost-effective, and stable bifunctional electrode for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is still a major challenge. This work reports on a novel method for fabricating TiN ceramic membrane supported nitrogen-incorporating NiCo 2 nanowires (NiCo 2 -N/TiN) as a bifunctional electrode. Owing to its unique structure, the ample reaction sites available, and the enhanced mass/charge transport ability, the NiCo 2 -N/TiN electrode exhibits efficient catalytic performance both in HER and OER, with overpotentials of 131 mV at 20 mA·cm −2 for HER and 330 mV at 20 mA·cm −2 for OER, together with excellent stability in alkaline solution. The NiCo 2 -N/TiN electrode only requires a cell voltage of 1.71 V to drive the current density of 20 mA·cm −2 for overall water splitting, which exhibits excellent stability for more than 100000 s. Accordingly, the produced ceramic membrane electrode has a great potential for application in industrial hydrogen production.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yupeng Shi,Dan Li,Haoxu Si,Yuping Duan,Chunhong Gong,Jingwei Zhang
Dielectric ceramics composites are potential high-temperature microwave absorption materials (MAMs), and the critical challenge is to achieve high-efficiency and temperature insensitive absorption characteristics suitable for wide temperature and frequency range. Herein, the electromagnetic attenuation properties of TiN/Fe 2 Ni 2 N/SiO 2 composites are studied in detail. The magnetic ceramic composites proposed exhibited stable attenuation behaviors at a wide temperature range (293–873 K). Notably, the optimal reflection loss (RL) value had reached −32.4 dB with a thickness of 2.8 mm at 373 K, and the effective absorption bandwidth (EAB) covered 3.89 GHz at 873 K. The excellent high-temperature attenuation capacity is attributed to the balancing strategy of dielectric and magnetic losses, as well as multiple polarization loss behaviors. The results showed that introducing magnetic components to form magnetic ceramic composites might shed light on the development of the TiN ceramic family for promising MAMs at a wide temperature range.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Chuntian Tan,Haisen Huang,Feihong Wang,Nianwang Ke,Anding Huang,Wangzhong Tang,Luyuan Hao,Liangjun Yin,Xin Xu,Yuxi Xian,Simeon Agathopoulos
The development of high-performance electrocatalytic electrodes for overall water splitting is a crucial issue to realize renewable hydrogen production . This paper presents the in situ growth of N -modified Co-based nanorods on porous TiN ceramic membranes using the hydrothermal method and thermal NH 3 treatment, resulting in a novel self-supported electrocatalytic electrode with abundant heterointerfaces, denoted as NCTN-x-y (x: nitridation temperature; y: nitridation time). In the alkaline medium (1 M KOH), the NCTN-350-2 electrode displays the best hydrogen evolution reaction (HER) activity (ƞ 10 = 66 mV), and the NCTN-250-3 electrode manifests the best oxygen evolution reaction (OER) performance (ƞ 10 = 270 mV). Accordingly, these two electrodes comprise an electrolyzer, which features a current density of 10 mA cm −2 at a low cell voltage of 1.63 V. The good electrocatalytic performance can be attributed to the abundant heterointerfaces formed between the porous TiN ceramic membrane and the N -modified Co-based nanorods , in conjunction with the hierarchical pore structure of the TiN ceramic membrane. Theoretical calculations identify that the construction of heterointerfaces modulates the electronic structure of active sites, thereby promoting the dissociation of H 2 O, optimizing the H* adsorption energy (ΔG H* ), and accelerating the reaction kinetics, which ultimately improve the electrocatalytic activity of electrode.
研究领域:
材料科学
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电化学
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Tete Daniel Koudama,Congxuan Su,Yihe Zhao,Xiaodong Wu,Ke Yuan,Sheng Cui,Xiaodong Shen,Xiangbao Chen
Ceramic aerogels are promising candidates for high-temperature thermal resistance and thermal insulation materials. However, their application can be restricted by their brittleness when exposed to harsh conditions. Herein, this study has developed a novel synthesis process based on a sol-gel method and carbothermal reduction-nitridation to produce a porous TiN composite aerogel from an organic/inorganic hybrid. The resulting TiN displays a polyhedral particle size of around 30–60 nm with nanoscale pores. In addition, the TiN aerogel demonstrates a high BET-specific surface area of 653.42 m 2 /g and a very low thermal conductivity of 0.046 W/(m·K). Furthermore, the TiN aerogel composite displays a good thermal difference with no shrinkage and cracks of the morphology during the butane blazing torch at 1300 °C for 10 min under air environment, demonstrating its excellent thermal insulation property and anti-oxidation characteristics. The gas-solid reaction mechanism of TiN aerogel based on the Gibbs free energy calculations is also proposed.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2018
·Vol. 28
·期 1
·423-430
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IF 1.34
Wang Bin,Du Jinjing,Gao Shoukun,Fang Zhao,Zhu Jun,Li Linbo
NiFe 2 O 4 /nano-TiN ceramics were fabricated by a two-step cold-pressing sintering process. Effect of sintering atmosphere (air, nitrogen, argon) on the synthesis process of NiFe 2 O 4 /nano-TiN ceramics was investigated. The DSC-TG and XRD analysis results indicated that besides principal phases of NiO and NiFe 2 O 4 , new-phase Ni 3 TiO 5 formed in the sintered ceramics under the three sintering atmospheres, and metallic phase including iron and nickel appeared in the sintered samples with inert gas (nitrogen, argon) sintering condition. Microstructure analysis results showed that considerable quantity of micropores appeared in the ceramic samples sintered under inert gases (argon, nitrogen), but lower porosity (3.0, 3.6%) and higher densities (4.78 g/cm 3 , 4.51 g/cm 3 ) can be obtained, comparing to the both values (14.4%, 4.17 g/cm 3 ) for the ceramic samples sintered under air atmosphere. Besides, the average bending strength and elastic modulus of the samples sintered under argon is 113.75 MPa and 7.13GPa, which is higher than that of 75.12 MPa, 5.42GPa and 91.96 MPa, 6.26GPa for the samples synthesized under air and nitrogen, separately. When changing sintering atmosphere from air to inert gases (argon, nitrogen), the fracture model of the 4 wt.%nano-TiN/NiFe 2 O 4 ceramics synthesized at 1400 °C for 4 h transformed from intergranular fracture to intergranular-transgranular fracture.
研究领域:
材料科学
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陶瓷工程
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固态化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）