Molecular Catalysis
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2021
·
IF 5.062
Kang Hu,Man Zhang,Biying Liu,Zhiyu Yang,Ruiqi Li,Kai Yan
2,5-furandicarboxylic acid (FDCA) is a key precursor for the sustainable synthesis of environmentally friendly materials such as polyethylene 2,5-furandicarboxylate (PEF). Developing noble-metal free and robust electrocatalysts are of great importance for the eco-friendly upgrading of biomass-derived 5-hydroxymethylfurfural (HMF) to produce FDCA. Herein we demonstrated a facile one-step hydrothermal method to grow tungsten trioxide (WO 3 ) nanorods on Ni foam, which was efficient for the electrochemical oxidation of HMF to FDCA. The 3D porous WO 3 /Ni electrode was controllably synthesized at low temperature with the aid of polyethylene glycol (PEG) template. Three types of electrodes were investigated and the catalytic results showed excellent electrochemical performance with the high electrochemically active surface area (ECSA) up to 40.0 cm 2 , 99.4 % HMF conversion rate, 88.3 % FDCA yield and 88.0 % Faradaic efficiency in 1.0 M KOH electrolyte under ambient conditions, avoiding the traditionally harsh environment (e.g. extra oxygen sources, high temperature and pressure). Besides, the product distribution, reaction kinetics and mechanisms were also investigated. This work provides an alternative and efficient way of electrocatalytic processing of biomass-derived monomers using noble-metal free catalysts under ambient conditions.
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RENEWABLE ENERGY
·
2020
·
IF 6.274
Han Chen,Qiong Xu,Du Zhang,Wenzhu Liu,Xianxiang Liu,Dulin Yin
A series of mesoporous nickel catalysts with different molar ratios of citric acid and nickel nitrate were synthesized via a simple two-step method by solid-state grinding and in-situ reduction; these catalysts were further employed for the catalytic transfer hydrogenation of levulinate esters to γ-valerolactone (GVL) with 2-propanol as the hydrogen donor. The effects of C 6 H 8 O 7 /Ni molar ratios , catalyst dosage, reaction temperature and time on the catalytic performance were investigated. An excellent GVL selectivity of 99.1% and an ethyl levulinate (EL) conversion of 100% could be achieved at 180 °C in 6 h over Ni-1.0 catalyst with a 1.0:1 M ratio of C 6 H 8 O 7 /Ni. The characterization results showed that the Ni-1.0 catalyst was composed of mesoporous metallic Ni bulk and a surface Ni–NiO composite, and the acid sites of NiO played a synergistic catalytic role in producing GVL from EL. The superior mesoporous structure and large surface area of Ni-1.0 increased the atomic utilization rate of nickel metallic active centers. Moreover, Ni-1.0 catalyst could be easily separated and reused ten times, with an EL conversion above 95% remaining in each recycle. This work provids a highly efficient and environmentally friendly catalytic procedure for the conversion of biomass into GVL, a fuel additive compound.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 45
·455503
·
IF 3.551
Mingzhu Wang,Xue Wang,Shiya Feng,Daiping He,Ping Jiang
Ever-growing efforts have been devoted to developing cost-effective and earth-abundant electrocatalysts with high-performance in biosensing and energy energy conversion. In this work, amorphous nickel-phosphorus (Ni-P) nanoparticles anchoring on Ni foam (Ni-P/NF) were prepared through a facile electroless deposition approach. The morphology and composition were characterized by scanning electron microscopy, x-ray diffraction and x-ray photoelectron spectroscopy. As an integrated anode, Ni-P/NF exhibits high performance towards glucose electrochemical sensing, with a high sensitivity of 13.89 mA mM−1 cm−2, a low detection limit of 1 µM, a wide detection ranges from 2 µM to 0.54 mM, and a quick response (<10 s), as well as good selectivity and reliability for real sample analysis in human serum. In addition to electrocatalytic glucose oxidation, Ni-P/NF shows remarkable catalytic activity towards oxygen evolution reaction (OER) in alkaline solution and it only needs an overpotential of 360 mV to afford 50 mA cm−2. Moreover, Ni-P/NF shows excellent durability under alkaline OER condition. All these results demonstrate Ni-P/NF as highly efficient integrated anode in both biosensing and energy conversion.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
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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CHINESE JOURNAL OF CATALYSIS
·
2020
·
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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Chemistry-An Asian Journal
·
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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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
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
·
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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CARBON
·
2020
·
IF 8.821
Sen Xue,Weimin Zhang,Qing Zhang,Jinhong Du,Hui-Ming Cheng,Wencai Ren
Water electrolysis in alkaline electrolyte is a promising technology for large-scale hydrogen production . However, the hydrogen evolution reaction (HER) is quite sluggish in alkaline electrolyte. Developing highly active and stable non-noble metal electrocatalysts is highly desired to solve this issue but of great challenge. Here, we report a catalyst constructed by Ni–Mo–N nanoparticles decorated on nitrogen-doped reduced graphene oxide (Ni–Mo–N/NG). Due to the high intrinsic electrocatalytic activity of heterostructured Ni–Mo–N nanoparticles and synergistic effects between the nanoparticles and graphene, the catalyst exhibits excellent HER electrocatalytic activity with zero onset potential and 46.6 and 159.8 mV overpotentials for 10 and 100 mA cm −2 , respectively, in alkaline electrolyte at low mass loading. Such electrocatalytic performances exceed those of many reported non-noble metal catalysts even with much higher mass loading, demonstrating the great potential of our Ni–Mo–N/NG catalysts for hydrogen production by water electrolysis.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·A4014
·
IF 3.12
Zhiyuan Song,Xueyu Zhang,Xuesong Li,Lianfeng Duan,Wei Lü
Flexible capacitor systems with high-performance and stretchable characteristics have been widely concerned due to potential applications in portable and wearable electronics. Herein, we prepared PVA/Carbon nanotube (CNT)@Ni(HCO3)2 flexible film as supercapacitor electrodes. CNTs is used as charge transfer pathway to enhance the conductivity of polymer and double-layer capacitance. Ni(HCO3)2 decorated on CNTs provides pseudocapacitance, and PVA matrix provides bendable and stretchable ability. The device achieves a specific capacitance of 143.6 mF cm−2, and the PVA/CNT@Ni(HCO3)2 film exhibits tensile strength of 0.37 MPa with elongation at break of 450%. The flexible device with excellent stretchable and bendable ability shows an instant response to the finger bending with the capacitance change more than 35%, which provides the possibility for fabricating novel smart flexible device to monitor human health and motion detection.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xin Guo,Menggang Li,Yequn Liu,Yarong Huang,Shuo Geng,Weiwei Yang,Yongsheng Yu
Rational construction of MnCo 2 O 4 -based core-shell nanomaterials with distinctive and desirable architectures possesses great potential in the advanced electrode material of high-performance supercapacitors. Here, a new class of hierarchical core-shell nanowire arrays (NWAs) with a shell of NiWO 4 nanoparticles and a core of MnCo 2 O 4 nanowires is reported, which can significantly improve the electrochemical energy storage properties of supercapacitors. The unique core-shell structure endows the MnCo 2 O 4 @NiWO 4 NWAs electrode with a high areal specific capacitance of 5.09 F cm −2 at a current density of 1 mA cm −2 and a superior cyclic retention of 96% after 5000 charge-discharge cycles, which are more preferable than those of MnCo 2 O 4 NWAs electrode. More importantly, an aqueous electrochemical energy storage device (core-shell MnCo 2 O 4 @NiWO 4 NWAs as the positive electrode and active carbon as the negative electrode, MnCo 2 O 4 @NiWO 4 //AC ASC) was assembled and shows a high energy density of 0.23 mWh cm −2 at a power density of 2.66 mW cm −2 , and 0.09 mWh cm −2 at 16.00 mW cm −2 , indicating hopeful potential for practical applications. This work highlights the significance of NiWO 4 as a shell for hierarchical core-shell nanostructures, which can further improve the electron transport characteristic of the electrode material, thereby achieving performance breakthroughs in energy storage devices.
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