Energy Materials
·
2024
·Vol. 4
·期 1
·N
·
IF 11.8
Teng Ke,Sining Yun,Kaijun Wang,Tian Xing,Jiaoe Dang,Yongwei Zhang,Menglong Sun,Jinhang An,Lijianan Liu,Jiayu Liu
Accelerants can enhance methane production in biomass energy systems. Single-component accelerants cannot satisfy the demands of anaerobic co-digestion (AcoD) to maximize overall performance. In this work, nitrogen-doped bio-based carbon derived from coconut shells, containing bimetallic Ni/Fe nanoparticles, FeNi3 alloys, and compounds (Fe2O3, FeN, and Fe3O4), was constructed as hybrid accelerants (Ni-N-C, Fe-N-C, and Fe/Ni-N-C) to boost CH4 production and CO2 reduction. The cumulative biogas yield (553.65, 509.65, and 587.76 mL/g volatile solids), methane content (63.58%, 57.90%, and 67.39%), and total chemical oxygen demand degradation rate (60.15%, 54.92%, and 65.38%) of AcoD with Ni-N-C (2.625 g/L), Fe-N-C (3.500 g/L), and Fe/Ni-N-C (2.625 g/L) were higher than control (346.32 mL/g volatile solids, 40.13%, and 32.03%), respectively. These digestates with Ni-N-C, Fe-N-C, and Fe/Ni-N-C showed excellent stability (mass loss: 22.97%-32.75%) and total nutrient content (4.43%-4.61%). Based on the synergistic effects of the different components of the hybrid accelerant, an understanding of the enhanced methanogenesis of AcoD was illustrated.
研究领域:
环境工程
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可再生能源
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生物能源
·
废物资源化
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微生物代谢
·
材料科学
·
碳材料化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Rongrong Li,Wenqi Liu,Huibin Liu,Hongyu Niu,Quan Zhou,Changhai Liang,Xiao Chen
One-pot hydrogenation of biomass-derived furfural with multiple reduction sites requires suitable metal sites to achieve a high value-added chemical in high yield. In this work, nonprecious Ni–Fe bimetallic catalysts with high efficiency derived from FexNiy/MgAl-LDH hydrotalcite precursors are prepared for one-pot sequential hydrogenation of furfural to tetrahydrofurfuryl alcohol at mild conditions. Through fine adjustment of metallic Fe/Ni molar ratios in hydrotalcite precursors, bimetallic FexNiy/MgAlO catalysts can be constructed. The topological transformation of hydrotalcite precursors provides a mesoporous structure for bimetallic supported catalysts. Due to the formation of the Ni–Fe alloy, there is an electron transfer from Fe to Ni in the catalyst due to the higher electronegativity of Ni than that of Fe, which greatly influences the adsorption of furfural on the surface of catalysts. Comparing the structures and catalytic performances of monometallic Ni/MgAlO and Fe/MgAlO catalysts, the Ni-rich Fe1Ni4/MgAlO catalyst with the dual active sites of metallic Ni and FeNi3 alloy presents high efficiency in sequential hydrogenation of the C═O bonds and C═C bonds of furfural to tetrahydrofurfuryl alcohol with the yield of 90.3% under 3 MPa H2 and 80 °C for 3 h, which can be an alternative for noble metal catalysts. Additionally, the Ni-rich Fe1Ni4/MgAlO catalyst presents excellent cycling stability. This design strategy for nonprecious NiFe bimetallic catalysts not only provide promising candidates for effective utilization of biobased furfural but also extend the application of bimetallic catalysts derived from hydrotalcite precursors for one-pot hydrogenation reactions.
研究领域:
催化
·
化学工程
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xupin Yang,Yu Du,Shicheng Yan,Zhigang Zou
The industrial application of NiFe-based electrocatalysts faces a critical challenge from Fe 3+ dissolution during alkaline water electrolysis. A breakthrough Fe/FeNi 3 @NiFeOOH heterostructure is reported that achieves remarkable industrial-grade performance, demonstrating both an ultralow overpotential (200 mV@100 mA cm −2 ) and unprecedented stability (>1800 h@70 °C, 1.7 V vs reversible hydrogen electrode, RHE). The exceptional stability stems from two synergistic effects: 1) a stepping interface electric field that stabilizes low-valence Fe species through electrostatic confinement, and 2) dynamic interfacial equilibrium maintained via uphill diffusion of trace Fe ions from electrolyte (ppm-level). This work provides a fundamental design strategy of highly stable electrocatalysts, paving the way for practical industrial-scale water electrolysis.
研究领域:
电化学
·
材料科学
·
能源技术
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Abdul Qayum,Xiang Peng,Jianfa Yuan,Yuanduo Qu,Jianhong Zhou,Zanling Huang,Hong Xia,Zhi Liu,Daniel Qi Tan,Paul K. Chu,Fushen Lu,Liangsheng Hu
Ni-/Fe-based materials are promising electrocatalysts for the oxygen evolution reaction (OER) but usually are not suitable for the hydrogen evolution reaction (HER). Herein, a durable and bifunctional catalyst consisting of Ni-FeOx and FeNi3 is prepared on nickel foam (Ni-FeOx/FeNi3/NF) by in situ solution combustion and subsequent calcination to accomplish efficient alkaline water splitting. Density functional theory (DFT) calculation shows that the high HER activity is attributed to the strong electronic coupling effects between FeOx and FeNi3 in the Janus nanoparticles by modulating ΔGH* and electronic states. Consequently, small overpotentials (η) of 71 and 272 mV in HER and 269 and 405 mV in OER yield current densities (j) of 50 and 1000 mA cm–2, respectively. The catalyst shows outstanding stability for 280 and 200 h in HER and OER at a j of ∼50 mA cm–2. Also, the robustness and mechanical stability of the electrode at an elevated j of ∼500 mA cm–2 are excellent. Moreover, Ni-FeOx/FeNi3/NF shows excellent water splitting activities as a bifunctional catalyst as exemplified by j of 50 and 500 mA cm–2 at cell voltages of 1.58 and 1.80 V, respectively. The Ni-FeOx/FeNi3/NF structure synthesized by the novel, simple, and scalable strategy has large potential in commercial water electrolysis, and the in situ combustion method holds great promise in the fabrication of thin-film electrodes for different applications.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wenji Ruan,Menglin Wu,Yuanhua Xia,Jiupai Ni,Chengsheng Ni
This study aimed at improving electrocatalytic activity of solid oxide electrolysis cell (SOEC) cathode via in-situ exsolved nanoparticles. La 0.67 Sr 0.33 Fe 0.67 Ti 0.33 O 3-δ (LSFT) and La 0.67 Sr 0.33 Fe 0.6 Ni 0.067 Ti 0.33 O 3-δ (LSFNT-67) cathodes with a La/Sr ratio about 2.0 showed the exsolution of Fe 0 and FeNi 3 alloy nanoparticles, respectively, under a reducing atmosphere. The SOEC with LSFT of electrocatalysis is better than LSFNT-67 at 800 °C for direct electrolysis of CO 2 , the current density of LSFT and LSFNT-67 reach − 0.54 A cm −2 and − 0.29 A cm −2 , respectively, and the Faradaic efficiency is close to unity during the 25 h′ durability under a − 1.3 V bias. The better cell performance for the cell with LSFT than LSFNT-67 could be related to the larger distortion and the less amount of insulating LaSrGa 3 O 7 in the former, causing its unexpectedly larger quantity of metal exsolution and electron conduction for more active reaction sites for CO 2 activation. This work demonstrated that apart from thermodynamic consideration, steric effect of the B site cation could be important for the exsolution of metal particles from a perovskite with high La/Sr ratio and the resultant electrocatalysis of CO 2 electrolysis.
研究领域:
材料科学
·
电化学
·
催化
·
能量转换
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xueqing Xu,Feitian Ran,Hua Lai,Zhongjun Cheng,Tong Lv,Lu Shao,Yuyan Liu
Metal–organic framework (MOFs) derived magnetic nanoparticles/porous carbon (M/C) composites featuring efficient interfacial engineering and spatially continuous three-dimensional (3D) networks are desirable electromagnetic wave (EMW) absorbing materials due to multiple transmission path and well impedance matching. However, it is challenging to construct such 3D interconnected carbon networks from a single MOF precursor. Herein, FeNi3 and N embedded 3D carbon networks comprising bamboo-like carbon nanotubes connected carbon nanorods (FeNi@CNT/CNRs) were prepared via one-step pyrolyzing of the composite of melamine and FeNi-MIL-88B. Attributed to the synergistic contributions of 3D interconnected carbon nanotube networks and MOFs derived M/C for multiple transmission path, impedance matching, and dielectric loss (especially for multiple polarization and micro-current), the FeNi@CNT/CNRs nanoarchitectures have demonstrated superior EMW absorbing performance. In particular, the optimized FeNi@CNT/CNR-0.9 has exhibited strong absorption (−47.0 dB, 2.3 mm in thickness) and broadband effective absorption (4.5 GHz, 1.6 mm in thickness). This attractive strategy holds promise as a general approach to fabricate the carbon hybrid network constituted of MOFs derived nanopolyhedron and CNTs for the target application.
研究领域:
材料科学
·
纳米技术
·
电磁材料
·
复合材料
✓ 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）