JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiang Li,Kelei Huang,Xiangchao Meng
The design of efficient electrocatalysts for hydrogen evolution reaction (HER) suitable for industrial applications remains a challenging task. In this work, Ru clusters were loaded onto WO 3 which were grown on carbon nanotubes (WRu/C-JH) using a rapid Joule heating method. The crystal phases of WO 3 was transformed, and abundant active sites were exposed during the rapid heating and cooling process. All these modifications contributed to the greatly improved electrocatalytic activity in HER. As tested, in 1 M KOH, it only required an overpotential of 22 mV to reach 10 mA cm −2 and 401 mV to reach a high current density of 1 A cm −2 on WRu/C-JH. Moreover, WRu/C-JH demonstrated excellent stability at 500 mA cm −2 for 100 h. Furthermore, a two-electrode system was constructed to assess overall water splitting performance of WRu/C-JH. This system was capable of reaching 100 mA cm −2 at a low voltage of 1.94 V. The mechanism of the enhancement in HER for as-prepared sample was also deeply discussed.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Zhiyuan Chen,Peipei Han,Wenhui Chen,Zhi Wan,Jizhou Yang,Zhigang Liu,Peng Hu,Feng Teng,Haibo Fan
In recent years, Ga2O3 flexible solar-blind ultraviolet photodetectors (UVPDs) are gradually becoming the focus of research and the industry because of their excellent wearability, low manufacturing cost, portability, large area compatibility, and high scalability. However, the crystallization temperature required for high-quality α-phase Ga2O3 films exceeds the heat resistance of most flexible materials, so the growth of Ga2O3 films on flexible substrates is a very big challenge. In this study, a highly ordered α-Ga2O3 nanorod array and flexible solar-blind UV PDs with excellent performance were successfully prepared on a flexible titanium (Ti) substrate at 500 °C by a simple water bath heating method. When irradiated by 254 nm ultraviolet light, the α-phase Ga2O3 flexible photodetector exhibits an excellent self-power optical response at 0 V bias and exhibits excellent photoelectric performance with a responsivity of 15.3 mA/W, a fast rise and fall time of 0.104 and 0.077 s, a photocurrent density of 45.7 μA/cm2, and a high detectivity of 13.8 × 109 Jones. Bending and repeating experiments demonstrated that the detector had high stability. This study provides a simpler and less expensive method for the preparation of flexible self-powered α-Ga2O3 solar-blind UV photodetectors.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18154-18163
·
IF 8.067
Bingxu Liu,Lihua Wang,Xiao Gong,Haiguang Zhao,Yuanming Zhang
Luminescent solar concentrators (LSCs) are large-area sunlight collectors, and they are able to reduce the cost of electricity and are suitable for application in building integrated photovoltaics. The key factor determining the optical efficiency of the LSC is the optical properties of the fluorophores. Among various types of fluorophores, carbon quantum dots (C-dots) have attracted great attention because of their size/shape/composition dependent optical properties and high stability. Although LSCs based on C-dots have been reported recently, it is still a big challenge to produce highly-bright cost-effective C-dots on a large-scale via a simple approach for efficient LSC fabrication. In this work, we demonstrate a simple solvent-free heating method using metal salts as dehydrating agents to produce C-dots in a large-quantity (100 gram per batch). The as-prepared C-dots have a typical absorption ranging from 300 to 500 nm, a large Stokes shift of 0.73 eV, a quantum yield (QY) as high as 70% and a small absorption/emission spectral overlap. The metal cation can not only contribute to the dehydration of the precursors, but also cap the C-dot surface by forming a stable structure, leading to a strong absorption peak at 405 nm and a large Stokes shift because of the intermediate energy states. Compared to Cu, Fe, Mg, Al, and Sr cations, Ca2+/Ba2+ capped C-dots exhibited the highest QY because of the efficient surface passivation. As a proof-of-concept, we fabricated the laminated LSCs using the as-obtained C-dots as fluorophores. The optimized LSC based on C-dots produced using BaCl2 or CaCl2 exhibits an external optical efficiency as high as 3.2% with a lateral size of 100 cm2. These results indicate that the solvent-free heating method can provide high-quality C-dots as building blocks for potential LSC applications.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hanqing Yu,Jianyu Li,Ni Yang,Dan Zhao,Bo Yang,Yanqing Hou,Gang Xie
The hydrogen evolution reaction (HER) is a critical electrochemical reaction in water splitting. However, existing noble metal catalysts tend to aggregate and dissolve under acidic conditions, resulting in low preparation efficiency, poor catalytic activity, and stability. To address this issue, this study employed an ultrafast Joule heating (UJH) technique to rapidly synthesize a cobalt-nickel nanoalloy heterostructure supported on carbon cloth (Co-Ni@CC) and tested its performance in electrocatalytic HER under acidic conditions. The study demonstrated that the metallic heterostructure of Co and Ni nanocrystals on a conductive carbon cloth substrate exhibited excellent dispersion, significantly increasing the contact area of active sites and delivering superior electrocatalytic performance ( η 10 = 231 mV, 111.7 mV dec −1 ). With its high catalytic activity, low cost, good electrical conductivity, and chemical stability, Co-Ni@ CC represents an ideal alternative to noble metal catalysts. Furthermore, this study demonstrates the potential of the UJH technique for rapidly constructing high-performance metal heterostructures, offering a new approach for developing electrocatalysts for overall water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yunshuo Zhu,Lili Guan,Xiwen Song,Yarong Huang,Ming Li,Qingxian Zhang,Ruihua Guo
Strict control of carbon emissions is crucial for expediting the achievement of carbon neutrality. However, the current CO 2 RR electrocatalytic exhibits numerous shortcomings that impede the enhancement of catalytic activity. Issues such as lengthy catalyst preparation times, and high levels of precious metal content. Additionally, the aggregation of ultrafine nanoparticles contributes to a rapid deterioration in catalytic performance. Herein, a Joule-heating method is efficiently utilized to synthesize heterostructures nano-catalysts for CO 2 electroreduction on carbon cloth substrates. This method takes advantage of the thermoelectric coupling of the carbon cloth to achieve carbothermal reduction, while also regulating phase composition and introduction of oxygen vacancies. The Cu-CeO 2 /TiO 2 /CC catalyst synthesized in this method showed a current density in CO 2 of −32 mA·cm −2 at −1.0 V (vs. RHE). Notably, this catalyst demonstrated high CO selectivity and Faraday efficiency (FE CO ) of up to 82.5 % at a low potential of −0.3 V (vs. RHE). Optimal electrochemical performance is achieved at a power of 40 W. The ultra-fast temperature change process prevented the agglomeration of catalyst particles and facilitated the construction of a stable heterogeneous interface with a high oxygen vacancy concentration. In conclusion, this study presents a promising approach, particularly for the rapid preparation of low-cost, highly selective non-precious metal electrocatalysts.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 9
·6879-6885
·
IF 3.708
Ping An,Zhurong Liang,Xueqing Xu,Xin Wang,Hu Jin,Nan Wang,Junxia Wang,Furong Zhu
Pure phase kesterite Cu2ZnSnS4 (CZTS) nanocrystals (NCs) have been successfully synthesized via a heating-up method utilizing metal salts as cation sources and thioacetamide (TAA) as a coordinating sulphur precursor in combination with oleylamine (OAm) as a coordinating ligand and solvent. The slower release of H2S from the metal–TAA complexes, as compared with the commonly used sulphur powder, is crucial for control of the grain size and size distribution of the NCs. As dominating coordinating ligands, OAm led to Sn-rich nuclei and kesterite CZTS NCs. The formation of pure phase kesterite CZTS NCs depends significantly on the temperature and Zn2+/Sn4+ molar ratio of the reaction system. The formation mechanism of the pure phase kesterite CZTS NCs has been clarified taking into account the chemical potentials of the elements involved.
研究领域:
材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Hao Ye,Juan Su,Guangxu Yang,Lingyun Zhou,Yadian Xie,Xinxing Zhan,Juan Tian,Xin Tong
The hydrogen evolution reaction (HER) is critical for sustainable hydrogen production via water splitting. High-entropy alloys (HEAs) have emerged as promising catalysts due to their tunable electronic properties and compositional diversity. While numerous methods exist for synthesizing HEAs, systematic comparisons of these approaches are lacking, and the mechanistic role of support surface engineering in regulating catalytic performance remains underexplored. In this study, three synthesis methods—fast-moving bed heating (FH), carbothermal shock (CTS), and slow heating (SH)—were compared to fabricate HEA nanoparticles on CNTs. The FH method, leveraging its dynamic temperature gradient and ultrafast heating rate, achieved rapid synthesis of highly dispersed HEA nanoparticles with suppressed aggregation. Based on FH method, nitrogen doping via NH 3 calcination further tailored the electronic structure and active-site distribution of CNTs, significantly enhancing HER activity. The optimized FeCoNiMnZn/N-CNTs prepared by FH achieved an overpotential of 184 mV at 10 mA/cm². Density functional theory (DFT) calculations revealed that nitrogen incorporation induces near-ideal hydrogen adsorption free energy (ΔG H⁎ ), accelerating H adsorption/desorption kinetics. This work not only advances the rational selection of synthesis protocols for HEA catalysts but also underscores the transformative potential of support surface engineering in optimizing catalytic behavior for clean energy technologies.
研究领域:
材料科学
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催化化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Chaoliang Geng,Jiankun Yuan,Tao Hong,Chenxi Xu,Jigui Cheng
The sluggish oxygen reduction kinetics remains to be the main obstacle to the development of low temperature proton ceramic fuel cells which limits its commercial application. This phenomenon has driven the exploration of the oxide electrode materials which both possess high oxygen reduction reaction activity and heterogeneous structure. In this work, mixed ionic and electronic conductor SrFe 0.9 Nb 0.1 O 3-δ (SFN113) is partially transformed into the triple-phase conductor Sr 3 Fe 1.8 Nb 0.2 O 7-δ (SFN327) by in-situ reaction with uniformly coated SrO layer using a microwave water bath heating method. The introduction of the second phase SFN327 significantly improves the oxygen surface exchange kinetics of SFN113 investigated by the electrical conductivity relaxation method. The present work not only remarkably improves the electrocatalytic reduction activity of SFN113 by the introduction of the second phase SFN327 and the construction of the heterogeneous interface, but also provides a valuable route for the further optimization of the exiting electrode materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2012
·
IF 1.829
Tursun Abdiryim,Aminam Ubul,Ruxangul Jamal,Feng Xu,Adalet Rahman
The poly(3,4-ethylenedioxythiophene)/single-walled carbon nanotubes (PEDOT/SWNTs) composites with content of SWNTs varying from 4 wt% to 12 wt% were prepared by a simple solid-state heating method. The results from FTIR and UV–vis spectra showed that the composites were successfully performed by this method, and the strong interactions between the PEDOT and SWNTs occurred in the composite with 8 wt% SWNTs as compared to other composites. The galvanostatic charge–discharge measurements indicated that the PEDOT/SWNTs composite had higher specific capacitances than PEDOT, and the composite with 8 wt% SWNTs had the highest specific capacitance among the composites. The morphological studies showed that the composite with 8 wt% SWNTs exhibited a mixture of the plate-like PEDOT and nonuniformly distributed SWNTs. The further electrochemical tests on the composite with 8 wt% SWNTs showed that the composite had a high specific capacitance of 188 F g −1 at 0.5 mA cm −2 and a capacity retention of 66% over 1300 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mei Xue,Zhiwen Ma,Yali Pan,Sihui Mao,Yingqiang Sun,Yupeng Yuan
Using photoluminescent (PL) graphitic carbon nitride (g-C 3 N 4 ) to convert ultraviolet (UV) light into chloroplast absorbed blue or near infrared (NR) is an attractive methodology to facilitate sunlight energy storage and carbon sequestration by microalgae. However, most researches focus on inhibiting water bloom by g-C 3 N 4 , applying PL g-C 3 N 4 to promote growth of microalgae is rarely reported. Accordingly, PL g-C 3 N 4 is synthesized by a microwave heating method and co–cultured with Chlorella vulgaris ( C. vulgaris ) with concentration of 0, 50, and 250 mg/L, named as C. vulgaris -0, C. vulgaris -50, and C. vulgaris -250, respectively, to study effect of PL g-C 3 N 4 on growth of C. vulgaris . Results indicate that there is no significant effect of microwave synthesized g-C 3 N 4 on morphology of microalgae cells, while cell viability and growth rate of C. vulgaris -50 is obviously enhanced. Further analysis indicates that, on the one hand, PL fluorescence at 615 nm enlarges light absorption of microalgae; on the other hand, photogenerated electrons by g-C 3 N 4 accelerate electron transfer in photosystem, subsequently enhancing formation of NADPH and ATP, which is favorable to growth of microalgae. Metabolism analysis illustrates that glucose, fructose, and galactose, involved in glycolysis and photosynthesis, are all up-regulated in C. vulgaris -50 group. This work reveals low concentration of PL g-C 3 N 4 facilitates protein synthesis and energy metabolism through enhancing light absorption and electron transfers, providing a biochemical strategy to enhance carbon sequestration.
研究领域:
环境科学
·
微生物学
·
生物技术
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Pan Liu,Jiguang Liu,Jiahui Liu,Xia Dong,Rui Wang
Using nitrogen, the morphological evolution of iron oxide/alkoxide particles was investigated by altering the reaction temperature in a one-pot solvothermal synthesis , resulting in a series of particles with different shapes, such as smooth sheet-like, rough sheet-like and cubic particles. The particle shape began to transform at 180 °C due to the altered crystallization and compositions, accompanied by the evolution of the magnetic properties without post-calcination. Based on the above research, large flower-like particles could be prepared by a two-step heating process. In virtue of the structural and morphological advantages, the flower-like particles were applied in fabricating a superwetting surface.
研究领域:
材料化学
·
纳米科技
·
表面科学
·
功能材料
·
物理化学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2014
·Vol. 9
·期 1
·1-8
·
IF 2.481
Abdiryim Tursun,Ali Ahmat,Jamal Ruxangul,Osman Yakupjan,Zhang Yu
Poly(3,4-ethylenedioxythiophene)/zinc oxide (PEDOT/ZnO) nanocomposites were prepared by a simple solid-state heating method, in which the content of ZnO was varied from 10 to 20 wt%. The structure and morphology of the composites were characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) absorption spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The photocatalytic activities of the composites were investigated by the degradation of methylene blue (MB) dye in aqueous medium under UV light and natural sunlight irradiation. The FTIR, UV-vis, and XRD results showed that the composites were successfully synthesized, and there was a strong interaction between PEDOT and nano-ZnO. The TEM results suggested that the composites were a mixture of shale-like PEDOT and less aggregated nano-ZnO. The photocatalytic activity results indicated that the incorporation of ZnO nanoparticles in composites can enhance the photocatalytic efficiency of the composites under both UV light and natural sunlight irradiation, and the highest photocatalytic efficiency under UV light (98.7%) and natural sunlight (96.6%) after 5 h occurred in the PEDOT/15wt%ZnO nanocomposite.
研究领域:
材料科学
·
环境科学
✓ 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）