INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2023
·
IF 4.6
Yuping Gai,Junbo Hu,Wei Deng,Wenshuo Xie,Xiang Li,Jingjing Zhang,Dewu Long,Shanlin Qiao,Fei Jiang
Summary. Electrochemical water decomposition as a crucial approach for the gradual growth of renewable energy has attracted extensive attention. Metal-organic frameworks (MOFs) which benefit from ultra-high specific surface area, controllable nanostructures, and excellent porosity have been widely used as high activity catalyst for the decomposition of water by electrochemical means. Herein, the composition and morphology of metal–organic framework nanoclusters with bimetallic Co/Fe-incorporated PTA/FDA nanoclusters is designed for efficient and durable OER electrocatalysts, including CoFe-BTC/PTA, CoFe-BTC/FDA, and CoFe-PTA/FDA. The crystal structure of MOF materials is composed of alternating organic hydrocarbon BTC, PTA, or FDA and inorganic metal oxide layer. Co and Fe interact as central atoms, joining BTC, PTA, or FDA ligands to form a highly symmetric MOF structure. The electronic structures and active sites of various metals are different, and the insertion of iron atoms plays a certain role in the regulation of their electronic structures. CoFe-PTA/FDA shows significant OER overpotential (1.525 V vs. RHE) reached 10 mA cm-2, with 62.85 mV dec-1 for Tafel slope and pretty conspicuous stability (72 hours of continuous testing). The DFT calculation results show coordination unsaturated metal atom is the primary active center of these electrocatalytic reaction, and the coupling effect caused by adding Fe is the key to adjust the electrocatalytic activity.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fengjiang Chen,Fan Yang,Hongchen Liu,Sai Che,Ge Zhang,Chong Xu,Yongfeng Li
A novel magnetic surface vulcanized cobalt-iron aerogel (CoFe-S MA) with a self-supporting, crosslinked bimetallic nanowire structure was fabricated via NaBH 4 -mediated gelation followed by in-situ vulcanization with Na 2 S solution, which showed efficient sulfadiazine (SDZ) degradation through peroxodisulfate (PDS) activation. The optimized CoFe-0.2S aerogels exhibited the best degradation performance (99.8%) for SDZ (10 mg/L, 100 mL) within 15 min, and the total organic carbon (TOC) removal efficiency reached 53%. The excellent degradation performance was attributed to the accelerated redox process and rapid formation of sulfate radical (SO 4 ·- ) caused by bimetal synergistic effect, as well as the sufficient exposed active sites provided by the self-supporting hierarchical porous structure of the aerogel. Compared with CoFe-MAs, electrochemical impedance spectroscopy (EIS) demonstrated lower resistance and more rapid charge transfer of CoFe-S MAs, which was ascribed to the presence of delocalized electrons in iron sulfides layer. A high turnover frequency (TOF) of 4.0 L∙min −1 ∙g −1 was achieved due to that the reduction effect of S 2- on the surface promoted the regeneration of Fe and Co active species. Electron paramagnetic resonance (EPR) and quenching experiments revealed the dominant reactive oxide species (ROS) to be SO 4 ·- , ‧OH, and Fe (Ⅳ). This work paves the way for the application of metal aerogels in the field of advanced oxidation process based on sulfate radical (AR-AOPs).
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Water
·
2026
·Vol. 18
·期 16
·1928
·
IF 3.5
Yixin Pan,Yajun Chen,Wenshuo Zhang,Xiaofan Lv
A nitrogen-doped carbon-confined cobalt–iron bimetallic catalyst (CFNC) was fabricated through high-temperature pyrolysis of a ZIF-67-modified CoFe2O4precursor and employed as a heterogeneous activator for peroxymonosulfate (PMS)-mediated Rhodamine B (RhB) degradation. The physicochemical properties of the as-prepared catalyst were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) analysis. These analyses demonstrated that Co–Fe bimetallic species were successfully embedded within the nitrogen-doped carbon framework, forming a confined carbon-supported catalytic structure. Under optimized conditions (CFNC dosage of 20 mg L−1, PMS concentration of 150 mg L−1, and initial pH of 7), the CFNC/PMS system achieved 99.45% RhB removal within 10 min. Moreover, the catalyst retained 78.91% degradation efficiency after five successive cycles, indicating its satisfactory reusability and structural stability. Mechanistic investigations based on radical scavenging experiments and electron paramagnetic resonance (EPR) analysis revealed that PMS activation over CFNC involved the coexistence of radical and non-radical oxidation pathways, in which singlet oxygen (1O2) played a predominant role. The defect-rich nitrogen-doped carbon matrix facilitated PMS adsorption and activation, promoting the selective formation of1O2, while the confined Co–Fe bimetallic sites contributed to efficient electron transfer during the catalytic process. The synergistic coupling between the Co–Fe active centers and conductive carbon framework accounted for the enhanced catalytic performance, suppressed metal leaching, and long-term stability of CFNC. This work presents a promising approach for constructing robust bimetallic carbon-based catalysts and advances the application of PMS-driven advanced oxidation processes for wastewater remediation.
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HYDROMETALLURGY
·
2020
·
IF 3.338
Xintao Yi,Guangsheng Huo,Wei Tang
The extraction of Fe(III), Ni(II) and Co(II) from a Ni(II)-Co(II) solution containing Fe(III) was analyzed in a chloride medium using a mixed extractant consisting of 50% ( v /v) tributyl phosphate (TBP), 20% (v/v) 2-octanol and 30% (v/v) kerosene. The extraction of 0.5 mol/L Fe(III) in 4 mol/L hydrochloric acid reached 97%, and the consumption of chloride ions was investigated. Nickel(II) ions were not detectably extracted by TBP, with an inclusion of <1.1%. Compared with Fe(III), TBP extracted only a small amount of Co(II). The iron complexes formed by TBP and 2-octanol were [H 2 FeCl 4 · 2TBP] and [H 2 FeCl 4 · 5(2-octanol)], and the possible compositions of Co-containing extracts were [H 2 CoCl 4 · 2TBP] and [H 2 CoCl 4 ] · n[2-octanol]. An industrial process consisting of two-step extraction was designed to achieve the separation of Co(II) and Fe(III), resulting in a decrease in the Fe/Co mass ratio from 0.46 to <3.5 × 10 −4 in the raffinate.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Guoru Li,Xiaobo He,Fengxiang Yin,Biaohua Chen,Huaqiang Yin
The development of highly efficient electrocatalysts with low cost for oxygen reduction reaction (ORR) is urgently required for metal-air batteries and fuel cells. In this work, Fe Co/MIL-101(Cr) with various molar ratios of Fe/Co as hybrid catalysts was prepared by a facile and mild impregnation method. MIL-101(Cr) increased the specific surface areas of the hybrid catalysts, thus improving the dispersion of Fe and Co species at their surfaces. The effects of Fe and Co species on ORR activity of the hybrid catalysts were investigated. It is found that the synergistic effects between the well-dispersed Fe and Co species contribute mainly to ORR activity. More specifically, Fe species exert a partial-charge-transfer-activation effect on Co ones, which reduces the charge transfer resistance and thus improves the catalytic activity . As a result, Fe Co/MIL-101(Cr) showed the excellent ORR activity, in which Co 50 Fe 50 /MIL-101(Cr) exhibited the superior ORR activity to the other prepared hybrid catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yunhao Liu,Qingpeng Cheng,Shuaishuai Lyu,Xincheng Li,Song Song,Tong Ding,Ye Tian,Xingang Li
In the realm of Fischer-Tropsch synthesis (FTS), the escalating cost of cobalt has spurred interest in Co-Fe bimetallic catalysts as substitutes for monometallic Co catalysts. Unfortunately, it is difficult to clarify specific functions and interactions of the two phases, as investigating catalysts in a unified dimension of both metal and support is still a challenge. Herein, we realize precise control over synthesizing nitrogen-doped carbon materials supported bimetallic catalysts containing CoFe alloy and Co + Fe 2 C dual active phases. The catalysts are comprehensively characterized to address the above problem by excluding the influence of metal sizes and support properties. Our findings reveal that compared to metallic Co alone and Co + Fe 2 C dual active phases, the Co-Fe interaction in CoFe alloy with electron transfer from Fe to Co optimizes reactant adsorption behaviors through achieving a larger number of strongly adsorbed CO per active site to increase the density of C* adsorbates and a higher surface CO/H 2 ratio to inhibit the hydrogenation of CH x * intermediates for chain termination, as well as an appropriate ability for CO adsorption/ dissociation. These advantages collectively enhance both CO activation and C-C coupling, and consequently, the CoFe/NC (CoFe alloy) catalyst exhibits the superior catalytic performance in the cobalt space–time yield in C 5+ products (3011.2 g C5+ kg Co −1 h −1 ), which surpasses the Co/NC (monometallic Co) and Co + Fe/NC (Co + Fe 2 C dual active phases) by 2.2 times and 2.4 times, respectively. This study serves as a promising route for the development of efficient and low-cost bimetallic catalysts through the strategic arrangement of multiple active phases for various reactions.
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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.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Zhewen Ma,Jianxin Zou,Darvaish Khan,Wen Zhu,Chuanzhu Hu,Xiaoqin Zeng,Wenjiang Ding
Two kinds of metal-organic frameworks (MOFs) based on Co (II) and Fe (II) as metal ions and trimasic acid (TMA) as organic linker were synthesized. They were used to prepare corresponding MgH 2 -TM MOF (TM = Co, Fe) composites via ball-milling. X-ray diffraction analyses show the formation of Mg 2 Co and α-Fe phases in MgH 2 -TM MOF composites after decomposition. Both of the well dispersed Mg 2 Co and α-Fe nanoparticles exhibit considerable catalytic efficiency in accelerating the sorption kinetics of MgH 2 . The dehydrogenated MgH 2 -Fe MOF composite shows faster hydriding kinetics than the pure MgH 2 and MgH 2 -Co MOF. Meanwhile, the apparent dehydrogenation activation energy ( E d ) of the MgH 2 -Co MOF and MgH 2 -Fe MOF composites are 151.3 ± 9.4 and 142.3 ± 6.5 kJ/mol H 2 , both of which are lower than that of pure MgH 2 (181.4 ± 9.2 kJ/mol H 2 ). The improvement on the sorption kinetics of the MgH 2 -TM MOF powders is mainly attributed to the catalytic effects of nano-sized Mg 2 Co and α-Fe formed on the surface of Mg/MgH 2 particles.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Liwei Chen,Xu Zuo,Liang Zhou,Yang Huang,Shengjiong Yang,Tianming Cai,Dahu Ding
The contamination issue caused by the antibiotics is now a big challenge due to its great potential hazardous to the human beings. Herein, three Co/Fe bimetallic oxides were synthesized for the activation of peroxymonosulfate (PMS) to degrade norfloxacin. The elemental analysis results confirmed the stoichiometric ratio of Fe/Co was 1.02, 2.03, and 6.65 (CoFe 2 O 4 ·CoO x , CoFe 2 O 4 , Co 0.4 Fe 2.6 O 4 ), respectively. The normalized pseudo-first-order kinetic rate constant ( k app ) of Co 0.4 Fe 2.6 O 4 was 0.18 L/(m 2 ·min), which was over 10 times higher than those of CoFe 2 O 4 ·CoO x (0.010 L/(m 2 ·min)) and CoFe 2 O 4 (0.012 L/(m 2 ·min)). The degradation process would be further accelerated under weak basic condition (pH = 8.5). The enhanced surface hydroxyl groups were found to be the probable reason for the higher efficiency through the XPS analysis. Moreover, the sulfate radical rather than hydroxyl radical dominated the degradation process in the developed Co 0.4 Fe 2.6 O 4 /PMS system. Overall, the magnetic Co/Fe bimetallic oxide catalyst prepared in this study could be served as a high-quality candidate for the catalytic oxidation of refractory organic pollutants.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Hao Lu,Lu Huang,Jingle Chen,Mingfeng Sun,Liguang Wu,Ting Wang
To address the efficient separation of refractory small-molecule pollutants such as p -nitrophenol (PNP) from industrial wastewater, bimetallic Co-Fe hydroxide nanoparticles were synthesized via a reverse microemulsion method and incorporated into polymer matrices. Initial studies on hybrid membranes with polyvinylidene fluoride (PVDF) matrices demonstrated enhanced hydrophilicity (contact angle reduction from 77.7° to 64.9°) and antifouling performance (85 % flux recovery rate), but their large pore size (∼70 nm) limited PNP rejection (22.5 %). To overcome this problem, polysulfone (PSF) was selected as an alternative matrix substrate. By systematically adjusting the film-forming time (15–50 min) during phase inversion, tight ultrafiltration membranes with controlled pore structures were fabricated. Prolonged film-forming time (30 min) optimized the solvent-nonsolvent exchange kinetics of the obtained PSF-3 membrane, yielding a dense selective layer with a narrow pore size distribution (3–8 nm) and molecular weight cut-off. This membrane achieved a PNP rejection rate of 71 % compared to 5 % of the PVDF membrane through synergistic "size sieving-hydroxyl adsorption" while maintaining low salt rejection (<15 %) and high flux stability (<15 % flux decline rate over 6 h). Hydrophilicity (49.6° contact angle) and antifouling performance (85 % flux recovery rate after four cycles) were significantly enhanced by uniformly dispersed nanoparticles. This study highlights the critical role of film-forming time in tailoring membrane architecture and performance, providing a novel strategy for efficient small-molecule separation from saline wastewater.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
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RSC Advances
·
2026
·Vol. 16
·期 3
·2205
·
IF 4.6
Qilin Guo,Jianchun Ma,Wenbo Lu,Ying Wang,Ergui Luo,He Xiao,Li Zhang,Haishun Wu,Tianjun Hu,Jianfeng Jia
The development of high-performance anode materials remains a critical challenge in advancing microbial fuel cells (MFCs). In this work, we present a novel strategy employing ternary transition metal Co-Fe-Ni sulfides to overcome the inherent trade-off between catalytic activity and structural stability commonly observed in conventional polymetallic sulfides. Through a facile one-pot solvothermal approach, we synthesized low-crystallinity CoFeNiS x (Co-Fe-Ni) ternary sulfides with precisely tunable Co/Fe/Ni molar ratios. When integrated as an MFC anode, the optimized Co-Fe-Ni sulfide delivered a maximum power density of 3915 mW m −2 using Escherichia coli ( E. coli ) as the biocatalyst, representing an 8.4% enhancement over its binary CoFeS x (Co-Fe) analogue. This performance exceeds that of most previously reported carbon-based anodes. The synthesized transition metal sulfides combine ease of fabrication with outstanding electrocatalytic efficiency. Our findings highlight the underexplored potential of ternary transition metal sulfides in engineering next-generation bioelectrochemical interfaces. Doping Ni into Co-Fe anode forms novel intermetallic linkages, accelerating electrochemical kinetics and reducing charge transfer resistance for maximum MFCs power output.
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