ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Xianshu Qiao,Hongjun Kang,Yang Li,Kai Cui,Xin Jia,Henghao Liu,Wei Qin,Max Pupucevski,Gang Wu
We report a highly efficient and stable electrode composed of a porous Fe-doped β-nickel hydroxide nanopyramid array supported on nickel foam (U–Fe-β-Ni(OH)2/NF) for overall water splitting. The unique structure is assembled via a self-templated strategy by utilizing the FeNi oxalate (FeNi–C2O4/NF) nanopyramid as the templates, followed by an anion-exchange reaction at room temperature. Due to the intrinsic activity of Fe-doped β-Ni(OH)2 along with unique porous array structures consisting of two-dimensional (2D) active materials on three-dimensional (3D) conductive substrates, the developed electrode exhibited outstanding electrocatalytic activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline medium. The introduced amount of Fe plays a significant role in promoting OER and HER activity compared to the β-Ni(OH)2 electrode. The optimal electrode (U–Fe-β-Ni(OH)2/NF-2) generated a current density of 10 mA cm–2 at low overpotentials of 218 mV for the OER and 121 mV for the HER. The electrode also demonstrated considerably stable performance during the continuous water splitting process. Furthermore, we elucidated the promotion mechanisms of the active Fe-doped β-Ni(OH)2 compound for the OER and HER based on extensive characterization and electrochemical measurements. Hence, this work provides a facile approach to developing low-cost, efficient, and stable hydroxide-based electrodes for bifunctional OER and HER in water splitting.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
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IF 2.627
Dairui Xie,Hongcheng Zhang,Meng Jiang,Hao Huang,Heng Zhang,Yang Liao,Shilin Zhao
Humic acid (HA) was carbonized at 300, 400 and 500 °C and then functionalized with 1 wt%–12 wt% Fe(III) respectively [CHA300/400/500-Fe(III)]. Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous tetracycline (TC: 25 mg·L −1 ) was studied. The adsorption equilibrium time for CHA400-Fe(III) to TC was 6 h faster and the adsorption removal efficiency ( R e ) was two times higher than that of HA/CHA. The adsorption R e of CHA400-Fe(III) loaded 10% iron [CHA400-(10%)Fe(III)] to TC could reach 99.8% at 8 h and still kept 80.6% after 8 cycles. The adsorption kinetics were well fitted to the pseudo-second-order equation and the adsorption isotherms could be well delineated via Langmuir equations( R 2 > 0.99), indicating that the homogeneous chemical adsorption of TC occurred on the adsorbents. The main adsorption mechanisms of TC were complexation Fe(III) and hydrophobic distribution. Electropositive and electronegative repulsion between TC and CHA400-(10%)Fe(III) at lowly pH(2) and highly pH(8–10) respectively, leaded to the relatively low adsorption capacity and more notable influence of ion concentration. When the pH was between 4 and 8, TC mainly existed in neutral molecules (TCH 2 ), so the influence of ion concentration was not obvious. The dynamic adsorption results showed that the CHA400-(10%)Fe(III) could continuously treat about 2.4 L TC(27 mg·L −1 ) wastewater with the effluent concentration as low as 0.068 mg·L −1 . Our study suggested a broad application prospect of a new, effective, low-cost and environment-friendly adsorbent CHA400-(10%)Fe(III) for treatment of low-concentration TC polluted wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Lei Liu,Huan Liu,Xingwei Sun,Chunping Li,Jie Bai
Transition metal iron-based catalysts are promising electrocatalysts for oxygen reduction reaction (ORR), and they have the potential to replace noble metal catalysts . The one-dimensional of carbon nanofibers with tubular structure can effectively promote the electrocatalytic activity , which facilitates electron transport . Herein, the Pt–Fe/CNFs were synthesized by electrospinning and subsequent calcination . Benefiting from the advantages of one-dimensional structure, Pt–Fe/CNFs-900 with fast electrochemical kinetics and excellent stability for ORR with excellent onset of 0.99 V, a low Tafel slope of 62 mV dec −1 and high limiting current density of 6.00 mA cm −2 . Long-term ORR testing indicated that the durability of this catalyst was superior to that of commercial Pt/C in alkaline electrolyte . According to RRDE test, the ORR reaction process of Pt–Fe/CNFs-900 was close to four-electron transfer routes.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11970-11983
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IF 3.553
Niu Yingchun,Li Xueai,Dong Wenqi,Zhang Can,Zhao Kuihu,Wang Fengyan,Wang Haiyan
Carbon and iron composites have drawn much attention for their unique electromagnetic properties. In addition, nitrogen doping of carbon can effectively modulate the dielectric properties of carbon. Therefore, synthesis of N-doped carbon and iron composites is an alternative method for obtaining high-efficiency microwave absorption materials. In previous studies, the synthesis process was very complicated including multistep routes. In this work, N-doped carbon with embedded Fe/Fe 3 C was synthesized in-situ via pyrolysis of amino phenol formaldehyde resin (APF) scattered with Fe 2 O 3 nanoparticles (APF/Fe 2 O 3 ), which was obtained through a simple hydrothermal process. During the heat-treatment process, the APF resin was converted into N-doped carbon, and simultaneously, the Fe 2 O 3 was reduced to iron nanoparticles. Then, inevitably, the iron nanoparticles reacted with carbon to form Fe 3 C at the interface between the iron particles and carbon. Taking advantage of multiple heterogenous interface, the interfacial polarization relaxation could be enhanced. Therefore, the N-doped carbon with embedded Fe/Fe 3 C particles displays microwave absorption with a maximum reflection loss of − 70 dB. Moreover, the effective absorption bandwidth (reflection loss of less than − 10 dB) reaches 6.02 GHz at a thickness of 2.13 mm. This study not only provides composites of N-doped carbon with embedded Fe/Fe 3 C particles with excellent stable microwave absorption but also offers a simple method for synthesizing N-doped carbon with embedded Fe/Fe 3 C particles.
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APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Fang Liu,Weiyang Jin,Ying Li,Lekai Zheng,Yongchuan Hu,Xuewen Xu,Yanming Xue,Chengchun Tang,Hui Liu,Jun Zhang
The development of efficient non-precious metal catalysts to accelerate the oxygen evolution reaction (OER) kinetics is important for the development of water-derived hydrogen fuel. Iron-cobalt oxide ((Co, Fe) 3 O 4 ) is one of the most promising transition metal-based OER electrocatalysts under alkaline conditions, but its activity is unsatisfactory due to its limited active sites and poor electronic conductivity. Herein, self-supported (Co, Fe) 3 O 4 hierarchical nanosheet arrays with massive oxygen vacancies (denoted as V O -(Co, Fe) 3 O 4 /CC) are synthesized by a simple reduction method at room temperature. Oxygen vacancies can regulate the ratio of Co 2+ /Co 3+ , which leads to the modification of its electronic properties, and it also significantly improves the charge transfer ability and accelerates the reaction. Meanwhile, the unique hierarchical nanosheet arrays structure and abundant oxygen vacancies effectively adjust the number of OER active sites, which has a key role in developing a cost-effective oxygen electrode. Accordingly, V O -(Co, Fe) 3 O 4 /CC exhibits a relatively low overpotential of 286 mV at 10 mA cm −2 and a low Tafel slope of 41 mV dec −1 .
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Journal of Chemistry
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2020
·
IF 1.79
Xiaofang Liu,Zhigang Liu,Qiuyun Zhang,Hongguo Wu,Rui Wang
MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2020
·Vol. 22
·期 14
·7218-7223
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IF 3.43
Mengyao Lv,Haichuan Guo,Hangjia Shen,Jun Wang,Jiacheng Wang,Yuichi Shimakawa,Minghui Yang
A key challenge in carrying out an efficient oxygen reduction reaction (ORR) is the design of a highly efficient electrocatalyst that must have fast kinetics, low cost and high stability for use in an energy-conversion device (e.g. metal–air batteries). Herein, we developed a platinum-free ORR electrocatalyst with a high surface area and pore volume via a molten salt method along with subsequent KOH activation. The activation treatment not only increases the surface area to 940.8 m2 g−1 by generating lots of pores, but also promotes the formation of uniform Fe3C nanoclusters within the atomic dispersed Fe–Nx carbon matrix in the final material (A-FeNC). A-FeNC displays excellent activity and long-term stability for the ORR in alkaline media, and shows a greater half-wave potential (0.85 V) and faster kinetics toward four-electron ORR as compared to those of 20 wt% Pt/C (0.83 V). As a cathode catalyst for the Zn–air battery, A-FeNC presents a peak power density of 102.2 mW cm−2, higher than that of the Pt/C constructed Zn–air battery (57.2 mW cm−2). The superior ORR catalytic performance of A-FeNC is ascribed to the increased exposure of active sites, active single-atom Fe–N–C centers, and enhancement by Fe3C nanoclusters.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Mingxuan Fu,Qi Zhang,Yuena Sun,Guyang Ning,Xinyu Fan,Haiyang Wang,Haijun Lu,Yufan Zhang,Huan Wang
Electrochemical water-splitting is widely regarded as one of the essential strategies to produce hydrogen energy, while Metal-organic frameworks (MOFs) materials are used to prepare electrochemical catalysts because of its controllable morphology and low cost. Herein, a series of trimetallic porous Pt-inlaid Ni–Fe nanocubes (NCs) are developed with bifunctions of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In the process of prepare the electrochemical catalysts, Pt nanoparticles are uniformly embedded in the Fe–Ni PBA cube structure, and ascorbic acid is employed as a reducing agent to reduce Pt 2+ to Pt nanoparticles. In this work, the cubic structure of Fe–Ni PBA is maintained and the noble metal Pt nanoparticles are embedded. Remarkably, the formation of PBA cubes, Pt inlay and reduction are completed in one step, and Pt nanoparticles are embedded by a simple method for the first time. By employing acid etching method, a porous structure is formed on the PBA cube, which increases the exposed area of the catalyst and provides more active sites for HER and OER. Due to the porous structure, highly electrochemical active surface area and the embedded of highly dispersed Pt nanoparticles, the porous 0.6 Ni–Fe–Pt nanocubes (NCs) exhibits excellently electrocatalytic performance and durable stability to HER and OER. In this work, for HER and OER, the Tafel slopes are 81 and 65 mV dec −1 , the overpotential η at the current density of 10 mA cm −2 are 463 and 333 mV, and the onset potential are 0.444 and 1.548 V, respectively. And after a 12-h i-t test and 1000 cycles of cyclic voltammetry (CV), it maintained high stability and durability. This work opens up a new preparation method for noble metal embedded MOF materials and provided a new idea for the preparation of carbon nanocomposites based on MOF.
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JOURNAL OF ORGANIC CHEMISTRY
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2020
·
IF 4.335
Zhiwei Chen,Xiang Bai,Jie Sun,Yicheng Xu
A facile Fe(III)-catalyzed oxidative decarboxylative radical coupling reaction of α,α-difluoroarylacetic acids with coumarins has been developed. This transformation, which provides a series of C-3 difluoroarylmethylated coumarins containing various functional groups in moderate-to-good yields, features easily accessible starting materials and operational simplicity.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Zhou Cao,Yuefa Jia,Qizhao Wang,Hongfei Cheng
Traditional homogeneous Fenton reactions can only be carried out under acidic conditions; however, visible light can greatly enhance the activity and stability of iron-doped semiconductor catalysts in the Fenton system. Therefore, in this study, a commercially applicable Fe/graphitic carbon nitride (g-C 3 N 4 )/kaolinite composite photocatalyst was prepared for the first time using an in-situ calcination process. The results showed that Fe ions and g-C 3 N 4 were successfully loaded onto kaolinite with a two-dimensional uniform sheet structure. The as-synthesized Fe/g-C 3 N 4 /kaolinite composite containing 0.9 mmol of Fe (Fe/CN/K-0.9) showed a degradation efficiency of 89% for tetracycline hydrochloride (TCH) within 80 min in the photo-Fenton system. Compared with photocatalytic degradation (29.6%) and Fenton degradation (76.6%), a photo-Fenton degradation efficiency of 85% was maintained after three cycles. Free radical scavenging experiments also showed that hydroxyl radicals were the main active substances. The enhanced photocatalytic activity of the composite was attributed to the large specific surface area of kaolinite, which could effectively adsorb TCH. Furthermore, Fe III acted as a photo-generated electron acceptor , which not only avoided photo-generated electron-hole recombination but also effectively reduced the consumption of H 2 O 2 to realize a stable Fe II /Fe III cycle reaction, thus improving photo-Fenton catalytic activity .
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
·
IF 5.268
Pu Zhang,Wanqiang Xia,Ping Deng,Yuanhong Min,Juan Tan,Yi Wang,Wensheng Fu
Peroxidase-like activity of MoS 2 quantum dots (QDs) can be reversibly regulated by means of Fe 3+ /alendronate sodium (ALDS)-induced aggregation/disaggregation of the QDs in solution. Specifically, Fe 3+ can selectively aggregate the MoS 2 QDs and thus greatly enhance their peroxidase-like activity, while such enhancement can be inhibited in the presence of ALDS owing to the competitive coordination of ALDS with Fe 3+ . By regulating the enzyme-like activity of MoS 2 QDs, different colorimetric signal of a typical substrate of horseradish peroxidase , 3,3΄,5,5΄-tetramethylbenzidine, can be measured in the presence of H 2 O 2 . Based on this mechanism, we develop a colorimetric approach for the determination of ALDS and further applied in quality control of pharmaceutical products, utilizing either smartphone or UV–vis spectrometer as a readout. This detection method is rapid and selective, where derivatization of ALDS before detection is not needed. Such a smartphone-based colorimetric detection platform is promising to be applied in point-of-care testing at home, small clinics, or underdeveloped regions.
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Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 9
·8115-8121
·
IF 4.987
Ren Dezhang,Jiang Xuelei,Zhang Nahui,Duo Jia,Norinaga Koyo,Huo Zhibao
Production of pyridine derivatives from bio-based feedstocks instead of fossil fuels is a promising strategy. The development of effective heterogeneous catalysts and mild reaction systems for pyridinization of renewable biomass derivatives remains a huge challenge. In this article, a direct and environment-friendly method was reported to produce 3-hydroxypyridine from bio-based furfural in water over a Raney Fe catalyst. Raney Fe exhibited an efficient catalytic performance for activation of the aldehyde group of furfural and afforded an 18.2% yield of 3-hydroxypyridine at 120 °C with ammonia as N source. The polymerization of furfural on the catalyst in hot water was the main cause of deactivation, which was verified by the scanning electron microscope (SEM), X-ray diffraction (XRD), and N 2 adsorption and desorption analysis. A possible mechanism for this reaction was also proposed. This study provides a new way for academia and industry to realize the synthesis of nitrogen-containing chemicals from biomass and its derivatives.
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