ChemElectroChem
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2019
·Vol. 6
·期 20
·5313-5320
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IF 3.975
Jingting Chen,Suqin Ci,Genxiang Wang,Nangan Senthilkumar,Mengtian Zhang,Qiuhua Xu,Zhenhai Wen
Graphical In nanotechnology we trust : A high-performance acid-alkali asymmetric-electrolyte electrolyzer (AAAE) was set up to implement energy-saving H 2 generation thanks to nanotechnology advances that enable us to develop self-supported electrodes with Ni(OH) 2 nanosheets for high-activity catalysis of urea oxidation. It is highly attractive to develop efficient water electrolysis route to implement hydrogen generation in a low-cost way, which while requires excess energy to surmount the activation barriers majorly limited by oxygen evolution reaction at anode side. Herein, we report an acid-alkali asymmetric-electrolyte electrolyzer (AAAE) that can achieve substantial energy saving for electrolysis hydrogen generation, thanks to the assistance of electrochemical neutralization energy (ENE) and urea oxidation reaction (UOR). To this end, free-standing Ni(OH) 2 nanosheets on carbon cloth (Ni(OH) 2 −NSs/CC) is fabricated as catalytic anode for alkaline UOR, which manifests impressively high catalytic activity with delivering 10 mA cm −2 at 1.32 V and long-term durability. The as-developed AAAE only requires an applied voltage of 0.66 V to release the electrolysis current of 10 mA cm −2 , yielding the H 2 Faraday efficiency close to 100 % along with H 2 production rate of 183.8 μmol h −1 .
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TALANTA
·
2019
·
IF 4.916
Li Su,Xinai Yu,Yuqi Miao,Guojiang Mao,Wenpei Dong,Suling Feng,Siman Liu,Like Yang,Kaige Zhang,Hua Zhang
Nanozymes’ activities could be regulated by a simple and effective pH change in an in situ manner. In this work, for the first time, the peroxidase-like activity of Ni/Co layered double hydroxides (LDHs) was regulated via the alkaline-promoted reaction of fluorogenic substrate homovanillic acid and H 2 O 2 , and a promising tool for pH sensing was developed over the pH range of 8.3–9.6. As peroxidase nanozyme model, Ni/Co LDHs showed ease of preparation, low-cost, and water-solubility, which played an important role in this luminescence system. Based on the pH-dependent regulation of the Ni/Co LDHs activity, we constructed the bioassay platform for the determination urea, urease, penicillin G, and penicillinase with a wide linear range of 17–1000 µM, 3.3–270 mU mL −1 , 3.3–1300 µM and 3.3–100 mU mL −1 , respectively. This study not only demonstrated the alkaline-promoted modulation the nanozymes’ activities, but also established a facile approach to develop novel bioassays.
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PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2019
·Vol. 66
·期 12
·1610-1618
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IF 1.188
Tao Wang,Aiyun Hu,Haijun Wang,Yongmei Xia
Layered double hydroxides (LDHs) and their derivatives have been reported to be widely used as heterogeneous catalysts in various reactions. Herein, Ni-Fe LDHs with the controlled Ni/Fe molar ratios (2:1, 3:1, 4:1) were synthesized via an easy hydrothermal method, which were used to catalyze the selective reduction of biomass-derived furfural into furfuryl alcohol using 2-propanol as a H-donor under autogenous pressure and characterized using FT-IR, XRD, TGA, BET, SEM, NH 3 -TPD, and CO 2 -TPD. It was found that the LDH with a Ni/Fe molar ratio of 3:1 demonstrated the best catalytic activity among the LDHs with different Ni/Fe molar ratios, which showed 97.0% conversion of furfural and 90.2% yield of furfuryl alcohol at 140°C for 5 hr. This was attributable to the synergistic effect of acidic sites and basic sites of the catalyst.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yan Lin,Yuan Pan,Shoujie Liu,Kaian Sun,Yuansheng Cheng,Ming Liu,Zhaojie Wang,Xiyou Li,Jun Zhang
Tuning structure, morphology and electronic state of electrocatalysts is essential to achieve highly efficient water splitting. Herein, we report synthesis of snap bean-like multi-dimensional core/shell Ni/NiCoP nano-heterojunctions (NHs) by adopting a solid phase transformation strategy. In the special structure, Ni nanoparticles are enclosed and strung by single phased NiCoP, forming strings of Ni/NiCoP core/shell heterojunctions, which showed improved stability and activity for both hydrogen evolution (HER) and oxygen evolution reactions (OER). X-ray photoelectron spectroscopy and synchrotron-radiation-based X-ray absorption spectroscopy reveal that interactions at the interface of Ni/NiCoP greatly changed electronic structures, which is a key intrinsic factor to underpin the enhanced electrocatalytic performance. Density functional theory calculations demonstrate Ni/NiCoP interface provide more optimal binding strength for H adatom and H 2 O molecule for HER, strong capture of hydroxyl, high valence Ni/Co species for OER. All these peculiarities facilitate the electrocatalytic process: only 1.57 V was needed to reach the current density of 10 mA·cm −2 for the overall water splitting using Ni/NiCoP NHs as both electrodes. This work demonstrates a facile strategy for synthesis of sophisticated catalytic interface at nano level and endows nano-heterojunction catalysts with enhanced performance for catalytic applications.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7219-7229
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IF 6.641
Xiaole Zhang,Dalei Song,Qi Liu,Rongrong Chen,Jindi Hou,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Jun Wang
The reasonable design of semiconductor metal oxides modified by elemental doping and surface functionalization has been proven to be an effective method to improve the gas sensing abilities of chemiresistor-type sensors. In this work, Ni-doped In2O3 nanorods were fabricated via simple oil bath and annealing processes. To further enhance their gas sensing performances, Ag functionalization was carried out by a subsequent chemical reduction process. The experimental results reveal that these composites exhibit excellent formaldehyde sensing performance compared with pure In2O3 nanorods. In particular, 6%-Ag/Ni5.0In presents significantly enhanced gas sensing performance toward 100 ppm formaldehyde gas at a low working temperature (160 °C) with high sensitivity (123.97), fast response speed (1.45 s/58.2 s), and good selectivity and stability. Our research reveals that the improvement in sensing performance toward formaldehyde can be attributed to the large specific surface area, high relative contents of OV and OC components, electronic sensitization and the catalytic effect of Ag. The results provide an effective strategy to achieve excellent gas sensing performance for formaldehyde gas sensors.
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ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Shuli Yin,Ziqiang Wang,Xiaoqian Qian,Dandan Yang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Tailoring the morphology and composition of Pt-based nanostructures is crucial to design high-performance electrocatalysts for direct methanol fuel cells. In this work, we propose a facile strategy to fabricate one-dimensional PtM (M = Co, Ni) mesoporous nanotubes (PtM MNTs), in which F127 and Te nanowires facilitate the formation of mesoporous exteriors and cannular interiors, respectively. Owing to the structural advantages of bimetallic mesoporous nanotube architectonics, the PtM MNTs exhibit superior electrochemical performance for the oxygen reduction reaction and methanol oxidation reaction. The proposed dual-template strategy is highly promising for designing active Pt-based mesoporous nanotubes with desired composition toward various electrocatalytic fields.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2019
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IF 2.683
Zilong Zhang,Yangyang Lv,Xiqiao Chen,Zhuang Wu,Yaoyi He,Lei Zhang,Yanhong Zou
The porous flower-like Ni/C composites were simply prepared through the pyrolysis of Zn-doped metal organic frameworks (MOFs) under a N 2 atmosphere. The method is facile, controllable and without surface active agents. The microstructure, composition, and electromagnetic parameters can be easily controlled by varying thermal decomposition temperature to achieve the high electromagnetic loss. Interestingly, the Ni/C composites calcined at 800 °C have strong electromagnetic absorption with the maximum reflection loss (RL) value of −52.4 dB. In addition, the effective absorption band width (<−10 dB) of absorbing coating is as high as 5 GHz, and it is noteworthy that the composites have a very thin matching thickness of 1.6 mm. The excellent electromagnetic attenuation performance can be ascribed to the novel flower structures, synergistic effect between nickel and carbon, and remarkable impedance matching. This designed flower-like composites supply an impactful pathway to achieve potential candidate materials as highly effective microwave absorbers.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Heng Zhang,Muhammad Usman Tahir,Xiuling Yan,Xueming Liu,Xintai Su,Lijuan Zhang
Using sodium oleate as surfactant and intercalating agent, a regulated Ni-Al layered double hydroxide (NA-LDH-OA) nanosheets with a high interlayer space were prepared by two-phase method combined with a short reflux process and mild solvothermal reaction. In the process of electrochemical reaction, the electron transport is accelerated by the higher base spacing of the NA-LDH-OA ultrathin nanosheets. The as-prepared material exhibited a high specific capacity (1.040 C cm −2 at a current density of 1.68 mA cm −2 ) and good cycling performance (capacity retention of 88.25% after 2000 cycles) in a three-electrode system. Moreover, an aqueous asymmetric supercapacitor (ASC) was assembled using the synthesized NA-LDH-OA nanosheets as the positive electrode and activated carbon (AC) as the negative electrode. The aqueous ASC device (NA-LDH-OA-2//AC) achieved a high energy density of 40.26 Wh kg −1 at a power density of 943 W kg −1 , and a good cycling performance of 94.5% retention after 5000 cycles. These results demonstrated that the NA-LDH-OA nanosheets possess the potential for upcoming energy storage devices.
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Energy Technology
·
2019
·Vol. 7
·期 10
·1900649
·
IF 3.163
Yiqun Du,Shimeng Zhao,Cheng Xu,Wenyang Zhang,Pan Li,Huixin Jin,Youjian Zhang,Zihan Wang,Jianxin Zhang
Rechargeable aluminum batteries (RABs) have been intensively studied recently in virtue of high volumetric energy density and cheapness. However, limited options for suitable cathode materials is the major obstacle to their large-scale application. Herein, nickel-iron layered double hydroxide (NiFe–LDH) microspheres with reduced graphene oxide (rGO) are reported as cathode for RABs. It is demonstrated that NiFe–LDH can provide large interlayer spacing for aluminum ions to interact, and the introduction of rGO endows NiFe–LDH with excellent structure stability, electronic conduction, and electrochemical reaction kinetics. The aluminum battery with a NiFe–LDH/rGO cathode delivers a high reversible capacity of 131 mA h g −1 at 1 A g −1 with nearly 100% coulombic efficiency after 100 cycles. The characterization results reveal that the reversible Al 3+ insertion/extraction along with the multielectron redox reactions occurs in the NiFe–LDH/rGO during the cycling process. The aforementioned strategies shed new light on the selection of compatible cathodes for RABs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Dawei Zhang,Lijuan Jiang,Yiyi Liu,Lijun Qiu,Jinming Zhang,Dingsheng Yuan
In order to solve the problem of large overpotential in water electrolysis for hydrogen production , transition metal sulfides are promising bifunctional electrocatalysts for hydrogen evolution reaction/oxygen evolution reaction that can significantly reduce overpotential. In this work, Ni 3 S 2 and amorphous MoS x nanorods directly grown on Ni foam (Ni 3 S 2 -MoS x /NF) were prepared via one-step solvothermal process, which were used as a high-efficient electrocatalyst for overall water splitting. The Ni 3 S 2 -MoS x /NF composite exhibits very low overpotentials of 65 and 312 mV to reach 10 mA cm −2 and 50 mA cm −2 in 1.0 M KOH for HER and OER, respectively. Besides, it exhibits a low Tafel slope (81 mV dec −1 for HER, 103 mV dec −1 for OER), high exchange current density (1.51 mA cm −2 for HER, 0.26 mA cm −2 for OER), and remarkable long-term cycle stability. This work provides new perspective for further the development of highly effective non-noble-metal materials in the energy field.
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IONICS
·
2019
·Vol. 25
·期 8
·3859-3866
·
IF 2.289
Bao Wentao,Tian Hua,Jiang Yang,Zhu Kaixin,Zhang Runa,Tan Yu,Li Wang,Yu Zhifeng,Wang Lin
Ni–Al layered double hydroxide with nitrate anions as interlayer building blocks was synthesized by a dual-anion intercalating strategy of hydroxyl and nitrate anions during a facile co-precipitation process. In this case, nitrate anions with low charge densities are capable to expand the interplanar spacing between host layers of Ni–Al layered double hydroxide in the replacement of pristine carbonate anions, benefiting to the diffusion of electrolyte ions to active sites within electrodes. Moreover, the optimization for packed arrangement of Ni–Al layered double hydroxide with nitrate anions nanosheets can be effectively realized by modulating reactant concentrations, leading to the formation of nanolayered structure in favor of increasing electrolyte accessible active sites within electrodes. The optimized Ni–Al layered double hydroxide with nitrate anions achieves a high specific capacitance of 1616 F g −1 at 1 A g −1 together with a capacitance retention of 82% at 10 A g −1 and good cycling stability.
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IONICS
·
2019
·Vol. 25
·期 11
·5485-5494
·
IF 2.289
Wang Xiaoqing,Tian Songran,Zhang Xiaoqing,Li Guoyan,Liu Ying,Chen Botao,Cheng Bowen
A 3D Ni 3 S 2 @Mn-Co-OH/NF cross-linked nanosheet heterostructure composite electrode has been successfully fabricated by a facile two-step hydrothermal method. The as-prepared Ni 3 S 2 @Mn-Co-OH/NF composite electrode exhibits a high capacitance (3163 F g −1 at a current density of 3 mA cm −2 ), a superior rate performance (2071 F g −1 at a current rate of 30 mA cm −2 ), and stable cycling property (maintaining 96.6% of the initial capacitance after 4000 cycles at a current rate of 10 mA cm −2 ). This excellent electrochemical performance can be ascribed to the unique cross-linked nanosheet heterostructure formed directly on Ni foam current collector and the synergistic effect between Mn-Co-OH and Ni 3 S 2 of the composite electrode.
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