Chemistry-An Asian Journal
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2020
·Vol. 15
·期 9
·1484-1492
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IF 4.056
Muheng Wang,Yun Wu,Na Li,Fei Zhao,Qiang Zhao,Jinping Li,Guang Liu
Graphical Benefiting from synergistic effects between a NiFe layer and CoS film, the obtained heterostructure CoS@NiFe/NF electrocatalyst displayed excellent oxygen evolution reaction activities at high current densities towards water splitting. Electrochemical water splitting is an ideal pollution-free path to generate hydrogen at large scale, however, the development of highly catalytic electrocatalysts for the water oxidation reaction at large current densities is still a fundamental challenge. Herein, we report a novel, high-wettability water-oxidation electrocatalyst composed of an amorphous NiFe layer and CoS film on commercial nickel foam via a two-step electrodeposition synthetic path. Benefiting from the strong interactions between the NiFe layer and CoS film, enlarged surface active sites and enhanced wettability, the CoS@NiFe/NF electrode exhibited an outstanding water oxidation performance at 10 mA/cm 2 with an overpotential of 175 mV in 1 M KOH solution and steadily delivered a current density of 1 A/cm 2 at merely 330 mV in 30 wt% KOH solution. Even at large densities, the CoS@NiFe/NF hybrids also showed excellent water oxidation stability and corrosion resistance for at least 24 h. Such a synergistic assembling approach to fabricate a CoS@NiFe/NF heterostructure together with excellent OER performance may be a promising strategy for rationally building and designing heterostructural electrocatalysts towards highly efficient water oxidation reaction.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Tan Dang,Guiqing Zhang,Qinggang Li,Zuoying Cao,Guanhua Zhang,Huigao Duan
Nanohybrid-type Ni-Co-phosphide/C (Ni-Co-P/C) hollow microflowers with ultrathin nanosheets (HUNs) are constructed through a modified ethylene glycol-mediated self-assembly process and further phosphating treatment. The peculiar structure can availably provide affluent mass transfer channels and active sites, meanwhile inhibit the aggregation of nanosheets. The synergistic effects of the produced Ni-Co-P/C are demonstrated systematically through regulating the initial Ni/Co ratio. A remarkable specific capacity of 205 mAh g −1 can be achieved at 1 A g −1 , and the optimized Ni 1 -Co 2 -P/C (referred to as NiCoP/CoP/C) still holds a superior rate capability with a capacity retention of 71% even at 50 A g −1 . Notably, the electrode also reveals an attractive capacity of 133 mAh g −1 with a high mass loading of 9.1 mg cm −2 . A hybrid supercapacitor assembled with Ni 1 -Co 2 -P/C cathode and N -doped porous carbon anode demonstrates outstanding electrochemical performance, such as a high energy density (43 Wh kg −1 at a power density of 818 W kg −1 ) and excellent stability (90% retention after 20,000 cycles at 12 A g −1 ). The facile fabrication process and attractive performance make Ni 1 -Co 2 -P/C HUNs promising in energy storage applications.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Naixu Li,Xu Liu,Jiancheng Zhou,Quanhong Ma,Maochang Liu,Wenshuai Chen
Direct conversion of cellulose into ethylene glycol is a promising route for transforming sustainable biomass resources into high-value chemicals. Although numerous attempts have been made to exploit tungsten-based hydrogenolysis catalysts in the catalytic conversion of cellulose to ethylene glycol for high conversion rate and selectivity, maintaining catalyst stability remains challenging. Herein, we have developed a Ni–W/M catalyst with good catalytic performance and stability, which were obtained by calcining Ni–W/MIL-125(Ti) precursor. The synthesized catalyst showed good cellulose conversion rate (100%) and ethylene glycol yield (68.7%). The tungsten species was linked to the TiO2 support by Ti–O–W bonds to reduce loss of the active tungsten component. The formation of new bonds enhanced the catalyst stability and durability, enabling the catalysts to retain high catalytic activity during recycling.
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CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
Xuemei Li,Junying Tian,Hailong Liu,Congkui Tang,Chungu Xia,Jing Chen,Zhiwei Huang
A highly efficient and green process was developed for the synthesis of useful 5-amino-1-pentanol (5-AP) from biomass-derived dihydropyran by coupling the in situ generation of 5-hydroxypentanal (5-HP, via the ring-opening tautomerization of 2-hydroxytetrahydropyran (2-HTHP)) and its reductive amination over supported Ni catalysts. The catalytic performances of the supported Ni catalysts on different oxides including SiO 2 , TiO 2 , ZrO 2 , γ-Al 2 O 3 , and MgO as well as several commercial hydrogenation catalysts were investigated. The Ni/ZrO 2 catalyst presented the highest 5-AP yield. The characterization results of the oxide-supported Ni catalysts showed that the Ni/ZrO 2 catalyst possessed high reducibility and a high surface acid density, which lead to the enhanced activity and selectivity of the catalyst. The effect of reaction parameters on the catalytic performance of the Ni/ZrO 2 catalyst was studied, and a high 5-AP yield of 90.8% was achieved in the reductive amination of 2-HTHP aqueous solution under mild conditions of 80 °C and 2 MPa H 2 . The stability of the Ni/ZrO 2 catalyst was studied using a continuous flow reactor, and only a slight decrease in the 5-AP yield was observed after a 90-h time-on-stream. Additionally, the reaction pathways for the reductive amination of 2-HTHP to synthesize 5-AP were proposed.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Dandan Han,Yuan Zhao,Ye Shen,Yen Wei,Liucheng Mao,Guangjian Zeng
High electrochemical performance of supercapacitor electrodes largely rely on the heterostructure of different active component materials. Furthermore, the integration of Co 3 O 4 nanowire (internal conductive highway) to bridge the Ni-Co layered double hydroxides nanosheets (provided high specific capacity), which is favorable for fast charge transfer, as well as improved conductivity. Thus, the Co 3 O 4 @Ni-Co LDH core-shell nanowire arrays electrodes exhibit a remarkable specific capacitance (1318 F·g −1 at 0.5 A·g −1 ) and also a relatively low resistance. Due to synergistic interaction of porous NiCo-LDH nanosheets and inner Co 3 O 4 nanowire, an asymmetric supercapacitor (ASC) is assembled with Co 3 O 4 @Ni-Co LDH as the anode and active carbon as cathode. The as-fabricated ASC shows high energy density of 46.3 Wh·kg −1 and exhibit superior cyclic stability of 92% retention after 5000 cycles, suggesting this electrode is promising for efficient electrochemical capacitors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Yinghao Li,Hongjie Yu,Ziqiang Wang,Songliang Liu,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Control synthesis of self-standing porous bimetallic nanosheet array is of significant importance for electrocatalytic applications. Herein, we report an in-situ approach for directly fabricating interweaved porous palladium-ruthenium nanosheets on Ni foam (PdRu NS-NF) via a micelle-assisted galvanic replacement reaction using Ni foam as both the reductant and substrate. These nanosheets possess interconnected porosity and bimetallic compositions , which provide abundant active sites and strong electronic effect. The binder-free PdRu NS-NF shows outstanding activity and stability for electrocatalytic nitrogen reduction to ammonia. Different from traditional complex methods for the fabrication of metallic nanosheets, the proposed approach is very feasible to directly synthesize metallic array with tunable morphology and composition on three-dimensional metallic substrates.
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ENERGY
·
2021
·
IF 7.147
Xiuquan Li,Zhongqing Yang,Li Zhang,Ziqiang He,Ruiming Fang,Ziqi Wang,Yunfei Yan,Jingyu Ran
The catalytic reaction of C 2 H 6 with CO 2 provides an opportunity to use shale gas and the greenhouse gas as source materials to produce ethylene through oxidative dehydrogenation or produce syngas through dry reforming . In this work, the reaction characteristics of ethane with CO 2 on Fe/Co/Ni/Cu monometallic catalysts and Pd-doped bimetallic catalysts were studied through activity test, kinetic analysis , catalyst characterization and DFT calculation. It is found that Pd–Fe 6 /CeO 2 has a high and stable C 2 H 4 selectivity of 80.4%, which is suitable for oxidative dehydrogenation reaction, while Ni 6 /CeO 2 has a large ethane/CO 2 conversion and a high CO selectivity of 96.5%, which is suitable for dry reforming reaction. For Fe-based catalyst, the doping of Pd form double active component structure. It only reduces the energy barrier of ethylene formation and CO 2 direct activation to provide O∗, but also increases the energy barrier of ethylene deep dehydrogenation, thus increasing the conversion of reactants and selectivity of C 2 H 4 . For Ni-based catalysts, the doping of Pd forms the alloy structure, which reduces the energy barrier of O∗-assisted dehydrogenation reaction and increases the conversion of reactants, but increases the energy barrier of C–C bond cleavage and CO 2 activation reaction, which reduces the selectivity of reforming to syngas.
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FUEL
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2021
·
IF 6.609
Hanzi Liu,Yi Zhang,Haiming Wang,Changfu You
Selective non-catalytic reduction of NOx (SNCR) with NH 3 is commonly used in industrial facilities like circulating fluidized bed (CFB) furnaces. However, the strongly temperature-dependent de-NOx feature confines its applications in a specific temperature range (900–1050 °C). Here, we report a new strategy on using Fe-Ni-W exchanged zeolite (0.5FNW-H) as a catalyst to extend the SNCR temperature window. In the CFB reactor, a significant NOx conversion improvement ranging from 14.1% to 80.9% was achieved at 700 to 850 °C by applying the developed catalyst. Catalyst dosage of 4500 h −1 (GHSV), a particle diameter of 0.1–0.3 mm, and NH 3 injection position at the dense-phase zone were found preferred for NOx reduction with the highest efficiency of ~85% at 700 °C. The physicochemical properties of the catalysts remained stable after the circulating reactions in the CFB reactor. The developed catalyst is particularly applicable for improving the SNCR performance when the thermal power plants are operated at low loads.
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ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Tuo Wang,Huimin Wu,Chuanqi Feng,Yu Ding,He Mei
In this study, Ni, N-NiMoO 4 /NF, and other compared materials are synthesized as bifunctional electrocatalysts for hydrogen evolution (HER) and urea oxidation reactions (UOR). The results of characterizations and tests show that the electrocatalytic performance of Ni, N-NiMoO 4 /NF is higher than those of NiMoO 4 •xH 2 O/NF, Ni-NiMoO 4 •xH 2 O/NF, and N-NiMoO 4 /NF, which may be caused by the synergy between Ni, N, and NiMoO 4 . The introduction of N and Ni increases the wettability and adsorption of the material, which also increases the conductivity and catalytic performance of the material. Furthermore, it is found that the electrodeposition time of metallic nickel (Ni, N-NiMoO 4 /NF-x ( x =10, 20, 30 min)) can affect the catalytic performances of Ni, N-NiMoO 4 /NF. The results show that the Ni, N-NiMoO 4 /NF-20 shows the best bifunctional electrocatalytic activity among all prepared samples, with 176 mV towards HER and 1.444 V towards UOR at 100 mA•cm −2 , demonstrating its potential in a practical application as a bifunctional electrocatalyst for hydrogen production in urea-water electrolysis.
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CHEMOSPHERE
·
2021
·
IF 7.086
Chao Xue,Wanling Cai,Xiulan Weng,Gary Owens,Zuliang Chen
The use of biomass for the synthesis of value-added products, such as functional nanomaterial for the removal of contaminants, is a challenge. In this study, hybrid bimetallic Fe/Ni nanoparticles and reduced graphene supported bimetallic Fe/Ni nanoparticles (Fe/Ni-rGO) were prepared via a one-step green synthesis using green tea extract, and thereafter evaluated for the simultaneous removal of rifampicin (RIF) and Pb(II) from aqueous solution. The efficiencies of Pb(II) and RIF removal by Fe/Ni-rGO were 87.5 and 96.8%, respectively. The removal performance of the hybrid Fe/Ni-rGO was better than either n Fe/Ni, rGO, or Fe-rGO. Detailed characterization and analyses of Fe/Ni-rGO indicated that both Fe and Ni nanoparticles were evenly distributed over the surface of rGO and that aggregation of Fe, Ni nanoparticles, and stacking of rGO in the hybrid were decreased. Furthermore, while LC-TOF-MS analysis showed that RIF was degraded into small-molecule fragments, XPS showed that Pb(II) was not reduced to Pb 0 . The major conditions impacting removal efficiency, adsorption kinetics, and fit to adsorption isotherm models were examined to better understand the removal mechanism. While the adsorption of both contaminants fit well a pseudo-second-order kinetic model, the adsorption of RIF fit the Freundlich isotherm model best, while the adsorption of Pb(II) fit the Langmuir isotherm model best. Thus, the removal mechanism of both contaminants firstly being chemical adsorbed onto the surface, while n Fe/Ni continues to participate in the catalytic reduction of RIF. Moreover, Fe/Ni-rGO could be reused and performed well for wastewater treatment , thus suitable as a practical resource recycling technology .
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 42
·24056-24063
·
IF 12.732
Yanfang Chen,Xuemei Yan,Jixiang Xu,Lei Wang
H2O2 has a wide range of uses as an oxidant and is also utilized as a high density and environmentally friendly fuel. In this study, crystalline g-C3N4 was modified with K+, Ni and N-doped carbon by thermal-polymerization of Ni2+-anchored and polyvinyl pyrrolidone-encapsulated melamine-cyanuric acid supramolecules, followed by re-calcination in a KCl–LiCl mixture. The obtained strip-like g-C3N4 nanocrystals exhibited high charge separation efficiency and good light absorption capability. Density-functional theory calculations confirmed that the orbital hybridization of Ni–N atoms enabled the formation of charge-transfer channels, which can capture electrons, achieve enhanced oxygen adsorption and reduction via a two-electron pathway. Under the synergistic effects of K+, Ni and N-doped carbon dopants and crystallinity, the obtained sample exhibited high photocatalytic H2O2 yields of 79.6 μM in O2-saturated pure water, which was 10-fold higher than the yield using pristine g-C3N4. This work provides a novel design for production of highly efficient photocatalysts for H2O2 production.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Yaru Wang,Jiaqin He,Xunxun Li,Mengmeng Wang,Yuanbo Zhou,Jun Xiao,Dongyun Chen,Jianmei Lu
MnO2 nanotubes loaded with Pt and Ni–Fe spinel were synthesized using simple hydrothermal and sol–gel techniques. After loading with Ni–Fe spinel, the specific surface area of the material increases 3-fold. This change helped to provide more active sites and facilitated the association between the catalyst and volatile organic compounds (VOCs). X-ray photoelectron spectroscopy determined that the adsorbed oxygen concentrations were all greatly increased after Pt loading, indicating that Pt promoted the adsorption of oxygen and so accelerated the combustion process. The performance of the catalyst after loading with 2 wt % Pt was greatly improved, such that the T90 for benzene decomposition was decreased to 113 °C. In addition, the 2% Pt/2Mn@NFO exhibited excellent low-temperature catalytic activity when reacting with low concentrations of toluene and ethyl acetate. This work therefore demonstrates a viable new approach to the development of Mn-based catalysts for the low temperature catalytic remediation of VOCs.
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