JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Wenjie Wei,Ping Li,Fenghong Lu,Kaicai Fan,Bin Li,Yanze Wei,Lingbo Zong,Lei Wang
Constructing highly efficient and stable electrocatalysts is the key to reducing the overall energy input for electrocatalytic water splitting, which ensures the reduced cost of environmentally friendly hydrogen resources with high energy density . Assisted by ultrafast pyrolysis with a flash Joule heating technique, CuRu ultrasmall alloy nanoparticles are uniformly coated on carbon nanotubes (CNTs) with tannic acid (TA) to chelate metal ions. During the pyrolysis procedure, the self-assembled TA molecules not only offer a cross-linked porous polyphenol framework but also provide more interactions to link the alloy nanoparticles and CNT substrates, forming highly conductive electrocatalysts with uniformly dispersed ultrasmall alloy metallic nanoparticles (∼ 4.3 nm in diameter) on the surface of porous CNTs (CuRu-CNTs). In particular, CuRu-CNTs with Cu-Ru alloy nanoparticles achieve the highest electrochemical activity, exhibiting tiny HER and OER overpotential of 39 mV and 330 mV at 10 mA cm −2 in 1.0 M KOH medium. The unique bifunctional feature of CuRu-CNTs allows good overall water splitting activity (10 mA cm −2 for 12 h), which is comparable with the best noble metal-based benchmark. This contribution provides a general energy saving pyrolysis method for the preparation of highly efficient, cost-effective and chemically stable electrocatalysts for water splitting.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
·Vol. 34
·期 39
·2403961
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IF 18.5
Sheng Zhu,Chong Guan,Yating Wu,Jiangfeng Ni,Gaoyi Han
Facilitating the transition and new application of fossil energy sources are crucial to attaining carbon neutrality. Conversion of coals into graphitic carbons represents an effective route to achieve their high-value utilization, while this process always involves corrosive/toxic chemical reagents and time-intensive heating treatment. Here, this work reports a green, rapid, and efficient flash Joule heating (FJH) technique to produce high-quality carbons from diverse coals within 1 s. The surface groups, defects, and graphitization degree of the resultant carbon materials are controlled during the instantaneous thermal shock process, and the relationships between the coal structures and the product properties are established. The results suggest that the anthracite with high coalification degree tends to form highly graphitic carbons at a peak temperature of ≈3300 K, presenting higher rate capability (79.1% capacity retention at 30 A g –1 ) and low relaxation time constant ( τ 0 = 0.27 s) toward capacitive energy storage. Besides, the flash carbon materials derived from lignite and bituminous coal with low coal rank show better capacitive performance with capacity above 80 F g –1 at 1 A g –1 . This study evidences that the FJH technology holds great potential to steer coals into valuable carbon materials.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2025
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IF 5.5
Pengchong Shen,Lili Guan,Zhekai Zhang,Jiaming Zhao,Yaqi Yang,Li Wu,Yarong Huang,Menggang Li,Xiwen Song
Water electrolysis has attracted the attention of many researchers as a green energy production pathway. However, the oxygen evolution reaction challenges the advancement of green energy from electrolytic water due to slow reaction kinetics and high overpotential. In this study, highly dispersed WCx nanoparticles on carbon cloth (CC) with good self-supporting properties were rapidly synthesized using flash Joule heating for 180 s. At the same time, the nonequilibrium ultrarapid impact process due to Joule heating makes it possible to have more defects in the integrated electrodes. As a result, JH-WCx/CC-900, which has been heat-treated at 900 °C, shows an excellent performance in alkaline media. To further enhance its electrocatalytic performance, the NiFe-LDH cladding layer was prepared on JH-WCx/CC-900 by a one-step electrodeposition technique, taking advantage of the synergistic effect between different components. The Ni5Fe5-LDH/WCx/CC electrode material showcased superior electrocatalytic performance in an alkaline medium, with a low overpotential of 215 mV at 10 mA cm–2 and a Tafel slope of 45.71 mV dec–1. The proposed synthesis and design strategy opens up a fast and simple route for the rapid synthesis of carbide catalysts.
研究领域:
材料科学
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能源化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
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2025
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IF 4.8
Jin Mengyu,Wu Detong,Song Yuanbo,Shi Yang,Wang Xiaoxia,Shen Zheng,Zhang Yalei
This study presents an efficient strategy for converting high-boiling solvent (HBS) pretreated cellulose into lactic acid (LA) over a Cr-Sn-Beta bimetallic catalyst synthesized by flash Joule heating (FJH). Ethylene glycol-based HBS pretreatment effectively enriched cellulose content in straw, while the FJH method enabled rapid and uniform metal incorporation. The resulting Cr-Sn-Beta catalyst exhibited a maximum LA yield of 33.54% with a carbon balance of 90.08%, showing high selectivity and catalytic efficiency. The synergistic function of Cr and Sn acid sites was also evaluated. This work provides a promising route for biomass valorization and catalyst design via combined pretreatment and advanced synthesis techniques.
研究领域:
催化
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生物质转化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2024
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IF 10.7
Lijuan Zhu,Zhongjie Lai,Jilong Xu,Peiyu Ma,Jiaxiang Lu,Qian Xu,Yitao Lin,Lei Zheng,Lihui Wu,Honghe Ding,Jiawei Ge,Yifan Ye
The metal–support interaction of heterogeneous catalysts has garnered significant attention due to its role in boosting electrocatalytic efficiency. Herein, we synthesized uniformly dispersed Pt nanoparticles decorated on a MoOx support by an ultrafast flash joule heating method. This method enables the simultaneous loading of metal and modification of support structures in a controllable, ultrafast manner. The optimal catalyst demonstrates exceptional performance in the hydrogen evolution reaction (HER) under acidic conditions, characterized by a low overpotential of only 55.08 mV to achieve a current density of 100 mA cm−2, a Tafel slope of 19.94 mV dec−1, and a significant mass activity of 13.80 A mgPt−1 at 50 mV vs. RHE. In addition, the optimal catalyst exhibits better stability for the HER than a commercial 20 wt% Pt/C catalyst. The spectroscopic characterization confirms the charge transfer between the metal and support, leading to a near-zero valence state of Pt in the optimal catalyst. Density functional theory calculations further corroborate that the metal–support interaction between Pt and MoOx leads to a suitable hydrogen adsorption free energy at the interfacial Pt site, which results in accelerating the reaction kinetics of the HER. This work aims to design and develop a metal–support heterostructure with high HER activity and stability, and provides a strategy for engineering crystalline structures and electronic configurations using an ultrafast flash Joule heating synthesis method.
研究领域:
材料科学
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电催化
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jin Li,Chengbin Wang,Xiaoyu Chen,Yu Zhang,Yuanyuan Zhang,Kaicai Fan,Lingbo Zong,Lei Wang
The design and controlled synthesis of high-performance alloy nanoparticles as bifunctional electrocatalysts towards hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of great industrial importance, but remains a great challenge. However, most of the prepared bimetallic alloys display unsatisfactory catalytic activity. Herein, NiRu alloy nanoparticles well-dispersed on N-rich carbon nanotubes (NiRu-CNTs) with a strong metal-support interaction (SMSI) are prepared through a flash Joule heating method in 0.5 s. Impressively, NiRu-CNTs exhibit remarkable HER activity under 1.0 M KOH solution with quite a small overpotential of 5.1 mV to reach the current density of 10 mA cm −2 . In addition, superior HER stability up to 10 h with no noticeable current density degradation is realized. As expected, NiRu-CNTs exhibits excellent OER performance with a small overpotential of 270 mV at 10 mA cm −2 , small Tafel slope of 54.1 mV dec −1 , and long-term durability over 5000 CV cycles. When used in two-electrode electrolyzer for overall water splitting, NiRu-CNTs displays a low voltage of 1.85 V at 100 mA cm −2 . This eco-friendly and cost-effective synthesis approach can be extended to the rational synthesis of various alloy catalysts with different metal species.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CARBON
·
2025
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IF 11.6
Junjie Wang,Cheng Wang,Haitao Yang,Hui Zhang,Dunyan Jiang,Shikuo Li
Design novel interfacial structure material to achieve highly efficient electromagnetic interference (EMI) shielding is one of the biggest challenges. Herein, the asymmetric C/SiC nanofiber film with conductive-dielectric gradient was precisely in situ prepared through the carbon thermal reduction reaction during the Flash Joule Heating (FJH) process. For the Fick diffusion of SiO 2 vapor, the SiC nanoparticles were gradually anchored on the carbon fibers with a gradient distribution from bottom to top. The electrical conductivity of the asymmetric C/SiC nanofiber film was thus continuously increasing from about 7.97 S cm −1 (bottom) to 0.59 S cm −1 (top). As a result, the asymmetric C/SiC nanofiber film achieved a maximum EMI shielding effectiveness (62.0 dB) in the X-band with a thickness of 1.5 mm, and superior stability in various extreme conditions. Moreover, the EMI shielding effectiveness of the asymmetric C/SiC nanofiber film can be adjusted by altering the incident direction or the film thickness. The effects of gradient structure on the potential distribution and electromagnetic wave loss for the asymmetric film were investigated by the Kelvin probe force microscope and finite element simulation analysis. This work provides a novel insight into designing reasonable interfacial structure to modulate EMI shielding performance.
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
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