ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Mingshu Xiao,Yuqing Miao,Weiwei Li,Yang Yang,Xiaocai Liang
In this study, a technology was developed for producing hydrogen via glycerol electrolysis. A homogeneous stock solution of a Ni catalyst was prepared, conserved and used for an alkali electrolyte with no precipitation due to the coordinative and protective effects of sodium tartrate and polyvinyl pyrrolidone (PVP). The deposition of the Ni(OH) 2 catalyst and its electrocatalysis toward glycerol occurred nearly simultaneously. Tedious and laborious procedures for preparing common catalysts and immobilizing them on an electrode surface were not required. The Ni(OH) 2 catalyst film self-repaired due to the presence of Ni in the alkali electrolyte. This technique also exhibited satisfactory electrocatalytic performance for hydrogen production via glycerol electrolysis with a high transformation efficiency and good stability. The Ni(OH) 2 electrocatalyst electrolyzed glycerol at the glassy carbon anode to produce H 2 O and CO 2 , and this H 2 O was electrochemically reduced at the Pt cathodic electrode to release H 2 . The formation of bubbles and the presence of PVP provided the anodic electrode surface a brilliant iridescence similar to that of butterfly wings due to the distributed Ni(OH) 2 nanostructures with large circular spaces and small nanoholes. Such systems using an abundance of the non-noble metal Ni have potential applications for solar energy and fuel cell development.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Yan Sang,Xi Cao,Lvxuan Wang,Gaofei Ding,Yingjie Wang,Deshuang Yu,Yanan Hao,Linlin Li,Shengjie Peng
Synthesis of highly efficient, non-noble and bi-functional electrocatalysts is exceedingly challenging and necessary for water splitting devices. In this work, three-dimensional spherical Ni(OH) 2 /NiCo 2 O 4 heterojunctions are prepared by a one-step hydrothermal method and the hybrids are explored as efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte via tuning different Ni/Co atomic ratios of heterojunctions . The optimized Ni(OH) 2 /NiCo 2 O 4 (S (1:1)) exhibits high electrocatalytic activity with an ultralow over-potential of 189 mV at 10 mA cm −2 for the HER. With regard to the OER, the over-potential of the as-synthesized S (1:1) heterojunction is only 224 mV at the current density of 10 mA cm −2 . The improved catalytic performance of the Ni(OH) 2 /NiCo 2 O 4 heterojunctions is attributed to the chemical synergic combining of Ni(OH) 2 and NiCo 2 O 4 , large specific surface area for exposing more accessible active sites, and heterointerface for activating the intermediates that facilitates electron/electrolyte transport. The prepared catalyst exhibits good durability and stability in HER and OER catalyzing conditions. This study provides a feasible approach for the building of highly efficient bifunctional water splitting electrocatalysts and stimulates the development of renewable energy conversion and storage devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Yuanfeng Wu,Xianghai Song,Fufeng Cai,Guomin Xiao
A series of Ce-NiO catalysts prepared by co-precipitation method were tested for glycerol transesterification with diethyl carbonate (DEC) to produce glycerol carbonate (GC). The microstructural and physicochemical properties of the catalysts were determined by XRD , XPS , SEM, EDX, CO 2 -TPD, N 2 -adsorption, FT-IR, and TG-DTG. The results showed that the particle size (100–350 nm) of the Ce-NiO was smaller than that of pure NiO (400–900 nm), suggesting addition of Ce in the catalyst synthesis could lessen the aggregation or facilitate the dispersion of NiO particles. The highest catalyst activity was observed over the Ce-NiO catalyst with Ce/Ni atomic ratio of 0.2 and calcined at 400 °C. 94.14% of glycerol conversion and 90.95% selectivity to GC were obtained over this catalyst under the optimum conditions (5 wt.% catalyst of glycerol, 85 °C, 8 h, glycerol/DEC ratio of 1:3). This catalyst can be reused up to three cycles with a slight decrease in its catalytic activity. It was found the well dispersed NiO particles and the strong basic sites derived from the substitution of Ce 4+ by Ni 2+ in the CeO 2 lattices synergistically promoted the glycerol conversion.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Tingting Bao,Tianci Hu,Chenxu Guo,Weixiong Liu,Hang Qin,Pengzhao Gao,Hanning Xiao,Wenming Guo
Ni/SiC x O y catalysts with multi-size distribution of Ni particles, were prepared and supported on porous SiC ceramics by a combination of inverse microemulsion and precipitation methods, as reaction microchannels for ethanol steam reforming (ESR). The microstructure, phase composition , reduction performance, hydrogen production performance of ESR, and the type and growth of carbon deposition were investigated for Ni/SiC x O y catalysts. The Ni catalysts embedded in SiC x O y film with the appropriate amount of precipitant exhibited multi-size distribution and minimal particle size. The initial ethanol conversion rate and H 2 selectivity of Ni/SiC x O y catalysts during ESR reaction were 100% and 75%, respectively, remaining 95% and 69.2% after 20 h, respectively. Raman and SEM results indicate that Ni/SiC x O y catalysts with appropriate amounts of precipitant tended to grow more loosely arranged carbon nanowires. The combination of inverse microemulsion and precipitation methods produced smaller and multi-size distributed Ni/SiC x O y catalysts with superior durability and hydrogen production performance in ESR reaction.
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Materials Advances
·
2020
·Vol. 1
·期 5
·1212-1219
·
IF 0
Jing-Bo Tan,Jing-Qi Wu,Jia-Wei Zhao,Ling-Jie Xie,Gao-Ren Li
Here, we report the successful fabrication of highly dispersed ultrafine Ni nanoparticles (NPs) embraced into the partially carbonized Ni-MOF-74 (Ni NPs/C@Ni-MOF-74) microrod arrays by the heat treatment of the rod-like Ni-MOF-74 arrays grown on Ni foam. The partial carbonization is an effective strategy to realize the homogeneous dispersion of ultrafine Ni NPs and carbon in the skeleton of rod-like Ni-MOF-74. This can prevent the encapsulated Ni NPs and carbon from aggregation and oxidation, allowing them to serve as highly efficient electrocatalysts. The fabricated Ni NPs/C@Ni-MOF-74 not only provide high specific surface area and high conductivity, but also provide good hydrophilicity and synergetic effects among Ni NPs, carbon and Ni-MOF-74 for the adsorption and activation of H2O molecules. The HER electrocatalytic performance of Ni NPs/C@Ni-MOF-74 arrays can be optimized by the control of the carbonization time and temperature. The optimized Ni NPs/C@Ni-MOF-74/NF shows outstanding HER catalytic performance, with a low overpotential of 131 mV at 10 mA cm−2 and excellent durability, and it is superior to most of the recently reported MOF-based HER electrocatalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Yanyan Wu,Zijuan Xie,Ying Li,Zhe Lv,Lingling Xu,Bo Wei
Developing efficient oxygen evolution reaction (OER) electrocatalysts with earth-abundant elements is very important for sustainable H 2 generation via electrochemical water splitting. Here we design a crystalline-amorphous Ni–Fe–Al hybrid phosphides nanosheet arrays grown on NiFe foam for efficient OER application. Dynamic surface reorganization of phosphides at anodic/cathodic polarizations is probed by in situ Raman spectroscopy . The reconstructed amorphous Ni(Fe)OOH species are determined as the active phases that facilitate the OER process. This unique electrode shows highly catalytic activity toward water oxidation , achieving the current densities of 10 and 100 mA cm −2 at 181 and 214 mV in 1 M KOH, respectively. Meanwhile, it also exhibits excellent stability at a large current density of 100 mA cm −2 for over 60 h. This work reveals the dynamic structural transformation of pre-catalyst in realistic conditions and highlights the important role of oxyhydroxides as real reactive species in OER process with high activity.
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RSC Advances
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2016
·Vol. 6
·期 82
·78257-78263
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IF 3.289
Jiabao Cui,Jingjing Jiang,Linqi Shi,Fei Zhao,Dejun Wang,Yanhong Lin,Tengfeng Xie
Ni-Doped ZnO nanofibers have been synthesized by a simple, facile electrospinning method. The structure and morphology of the products were characterized by SEM, HRTEM and XRD analysis. X-ray photoelectron spectroscopy (XPS) confirmed that Ni2+ ions exist in the ZnO nanofiber structures. The photoelectric gas-sensing tests reveal that the response was significantly enhanced by Ni doping, and the 0.7% molar ratio Ni-doped sample (NZ0.7) exhibits the highest response of 532.7% to 100 ppm HCHO at room temperature. Photoluminescence (PL) measurements show that there are more donors in Ni-doped ZnO nanofibers by the introduction of Ni2+ ions. Furthermore, the surface photovoltage (SPV) and transient photovoltage (TPV) tests indicated that Ni doping can effectively enhance the donor density, which could facilitate charge separation and transport in the semiconductor, and promote photogenerated holes to move toward the irradiated surface of the samples. These results contribute to the photocatalytic oxidation of HCHO so as to achieve higher gas-sensing properties for Ni-doped ZnO nanofibers.
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ACS Omega
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2021
·
IF 3.512
Xianyu Liu,Tayyaba Najam,Ghulam Yasin,Mohan Kumar,Miao Wang
Herein, we successfully synthesized two novel metal thiophosphites (MTPs) hybridized with carbon, that is, NiPS3/C and SnPS3/C composites, via an environment-friendly and cost-effective approach without harsh reaction conditions. Subsequently, the electrochemical performances of NiPS3/C and SnPS3/C composites have been investigated in coin-cells, and it is revealed that MTPs/C have a significantly higher Li-storage capacity and better stability compared to the MTPs without carbon. Moreover, the SnPS3/C electrode shows a lower internal resistance and a better rate performance compared to NiPS3/C. We employed extensive ex situ experiments to characterize the materials and interpreted the remarkably improved performance of MTPs/C.
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Chinese Physics B
·
2016
·Vol. 25
·期 8
·088201
·
IF 1.436
Chao Li,Jun-Jie Sun,Duo Chen,Guang-Bing Han,Shu-Yun Yu,Shi-Shou Kang,Liang-Mo Mei
A facile step-by-step approach is developed for synthesizing the high-efficiency and magnetic recyclable Fe3O4@SiO2@Ag@Ni trepang-like nanocomposites. This method involves coating Fe2O3 nanorods with a uniform silica layer, reduction in 10% H2/Ar atmosphere to transform the Fe2O3 into magnetic Fe3O4, and finally depositing Ag@Ni core-shell nanoparticles on the L-lysine modified surface of Fe3O4@SiO2 nanorods. The fabricated nanocomposites are further characterized by x-ray diffraction, transmission electron microscopy, scanning electron microscope, Fourier transform infrared spectroscopy, and inductively coupled plasma mass spectroscopy. The Fe3O4@SiO2@Ag@Ni trepang-like nanocomposites exhibit remarkably higher catalytic efficiency than monometallic Fe3O4@SiO2@Ag nanocomposites toward the degradation of Rhodamine B (RhB) at room temperature, and maintain superior catalytic activity even after six cycles. In addition, these samples could be easily separated from the catalytic system by an external magnet and reused, which shows great potential applications in treating waste water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jie Chu,Chen Liang,Wenyan Xue,Pu Huang,Yafei Guo,Ruilin Wang,Jian Sun,Weiling Li,Chuanwen Zhao
Integrated CO 2 capture and utilization by reverse water gas shift (ICCU-RWGS) reaction for syngas production for C1 chemical industry has gained increasing attention. Designing highly active bifunctional materials that enables CO 2 adsorption and in-situ conversion is essential. In this work, Ni-Na 2 ZrO 3 bifunctional materials are prepared by different synthetic methods for ICCU-RWGS. N 2 physisorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), CO 2 temperature-programmed desorption (CO 2 -TPD) and H 2 temperature-programmed reduction (H 2 -TPR) analysis reveals that Ni-Na 2 ZrO 3 -CP prepared by the co-precipitation (CP) method shows small Ni crystalline size, moderate surface basicity, and excellent reducibility. ICCU-RWGS performance is investigated under isothermal conditions of 650 °C, 10 %CO 2 and 35 %H 2 . The results indicate that Ni-Na 2 ZrO 3 -CP demonstrates excellent performance in ICCU-RWGS, with a notable CO 2 capture capacity of 3.76 mmol CO 2 /g and a CO production rate of 3.10 mmol CO/g. Additionally, it exhibits relatively good operational stability. Detailed reaction paths of the ICCU-RWGS procedure for the Ni-Na 2 ZrO 3 bifunctional materials are proposed. The findings will shed new perspectives on the design of synthetic bifunctional catalysts for ICCU-RWGS.
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ACTA PHYSICO-CHIMICA SINICA
·
2023
·
IF 10.9
Kezhen Lai,Fengyan Li,Ning Li,Yangqin Gao,Lei Ge
Hydrogen is an important zero-pollution green energy source with potential for alleviating environmental contamination and energy shortages. Hydrogen evolution via solar-energy-induced semiconducting water splitting is among the most environmentally friendly methods available to date. In this study, a metal–organic-framework-derived, Ni-decorated carbon nanotube (Ni-CNT) is used as a non-noble co-catalyst. This Ni-CNT is grown in situ on ZnIn 2 S 4 nanosheets using a simple one-step oil bath strategy, wherein Ni nanoparticles are wrapped around the top and cross sections of the nanotubes, preventing their agglomeration. Notably, Ni-CNT/ZnIn 2 S 4 heterostructures feature intimate contact interfaces that promote charge transfer, facilitating their use as efficient photocatalysts for hydrogen evolution. The 38Ni-CNT/ZnIn 2 S 4 sample exhibits a high H 2 production rate (12267 μmolꞏh −1 ꞏg −1 ), with an apparent quantum efficiency (AQE) of 11.3% under 420 nm monochromatic light irradiation, which is nearly 6.4 times that of pure ZnIn 2 S 4 . The results of X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) corroborate the observations on Ni-CNT/ZnIn 2 S 4 heterostructures. Electrochemical measurements reveal that the combination of the Ni-CNT and ZnIn 2 S 4 facilitates the transfer of photogenerated electrons and effectively prevents rapid recombination of photocarriers, thus improving the hydrogen evolution performance of ZnIn 2 S 4 . Electron spin resonance (ESR) results further prove that cocatalyst Ni-CNTs are beneficial for prolonging the lifetimes of ZnIn 2 S 4 photogenerated electrons, thereby achieving effective charge separation. A charge transfer pathway in the heterojunction interfaces is further explored and confirmed by density functional theory (DFT) calculations. The difference in the Fermi level energy ( E f ) contributes to both charge migration and the generation of a built-in electronic field (BEF), indicating that the energy band of ZnIn 2 S 4 bends downward, which is favorable for photogenerated electron flow from ZnIn 2 S 4 to the Ni-CNT electron acceptor. The results of planar-averaged electron density difference analysis confirm that the hot electrons are transferred from Ni nanoparticles to the CNT and then to the ZnIn 2 S 4 nanosheets, indicating the formation of a photogenerated electron transfer pathway of ZnIn 2 S 4 → CNT → Ni. Furthermore, Gibbs free energy of H* adsorption (Δ G H* ) and crystal orbital Hamilton population (COHP) analysis indicate that Ni nanoparticles can serve as active sites, promoting H 2 evolution. Thus, the present study formulates a new strategy for developing low-cost, high-efficiency, non-noble-metal co-catalysts for photocatalytic hydrogen production. Download: Download high-res image (88KB) Download: Download full-size image
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Arabian Journal of Chemistry
·
2021
·
IF 5.165
Na Li,Kai Yuan,Tengjia Gao,Shun Li,Jianliang Qin,Yirong Zhu,Jingjing Du,Lijian Xu,Jianxiong Xu
Design of electrode materials with excellent electrochemical properties for advanced energy storage device are important to the sustainable development of energy resources. In this manuscript, a novel hierarchical nanoporous carbon@nickel hydroxide (HNCMs@Ni(OH) 2 ) composites were prepared through simple in-situ chemical deposition of Ni(OH) 2 nanocrystals on HNCMs. By tailoring the deposition amount, core–shell structured rambutan-like HNCMs@Ni(OH) 2 microspheres with hairy nickel hydroxide nanocrystal covered on HNCMs were obtained. Ascribed to the high specific capacitance of nickel hydroxide and the interconnected hierarchical porous structure of HNCMs, the resultant rambutan-like HNCMs@Ni(OH) 2 microspheres as electrode materials display outstanding electrochemical properties including high specific capacity of 248.9 mAh/g at 1 A/g and good capacitance retention of 62.9% at 20 A/g. Furthermore, a hybrid supercapacitor with rambutan-like HNCMs@Ni(OH) 2 microspheres as cathode and HNCMs as anode were assembled and showed a comparable energy density of 41.3 Wh/kg at the power density of 173.3 W/kg and high capacity retention of 85.2% after 20,000 cycles at 5 A/g. As a proof of concept example, the fabricated hybrid supercapacitor can be utilized as energy source to instantaneous light up a red LED indicator. We envisioned that the as-prepared rambutan-like HNCMs@Ni(OH) 2 microspheres have great potential in constructing of advanced energy storage devices.
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