DALTON TRANSACTIONS
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2020
·Vol. 49
·期 24
·8226-8237
·
IF 4.174
Chen Mu,Denys S. Butenko,Ievgen V. Odynets,Іgor V. Zatovsky,Junzhi Li,Wei Han,Nickolai I. Klyui
There is wide interest in developing efficient, robust and low-cost electrode materials for the electrolysis of water to produce clean hydrogen fuel. It is especially important to improve the performance and durability of electrocatalysts for the OER. Here we have shown that the transformation of nanoparticle (n-NNP) and crystalline (c-NNP) forms of mixed phosphate Na4Ni3(PO4)2P2O7 in highly alkaline solutions occurs along various routes and provokes the generation of 2D Ni(OH)2 nanosheets or stable core(phosphate)–shell(Ni(OH)2) particles, respectively. In both cases, in the carbon matrix (through chemical and electrochemical conversion of phosphate in situ during electrolysis in a 6 M KOH or NaOH solution) stable OER electrocatalysts with low overpotentials of 250–290 mV at a current density of 10 mA cm−2 were obtained. The best candidate for the OER process is core–shell particles, which maintain overpotentials of around 250 mV in 6 M KOH for more than 3 days. The activity enhancement can be attributed to the formation of abundant NiOOH nanoparticles on the shell surface due to improved lattice matching. This report discusses future prospects for the creation of core–shell particles to reduce the overpotential of durable electrocatalysts for the OER.
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高影响因子
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
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2020
·Vol. 1
·期 5
·1212-1219
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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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ACS Applied Energy Materials
·
2021
·
IF 6.024
Xianyan Jiang,Shuping Deng,Junjie Liu,Ning Qi,Zhiquan Chen
A Cu2+ and Zn2+ bimetallic doped metal–organic framework Ni2(bdc)2(dabco) (CuZnNi–MOF, where bdc is 1,4-benzenedicarboxylic acid and dabco is 1,4-diazabicyclo[2.2.2]-octane), has been successfully synthesized by the solvothermal method. The carbon-held metal compound nanoparticles (MCN@C) and metal oxide composite (CuOZnONiO) were subsequently obtained by using the CuZnNi–MOF as the precursor. The electrochemical performance of the prepared samples was evaluated in an electrolyte with and without a redox additive (K4Fe(CN)6). The specific capacity of the samples tested in the electrolyte with Fe(CN)64–/Fe(CN)63– has a high value of 112.5 mA h g–1 at 1 A g–1, which is much higher than that measured in the electrolyte without the redox additive, indicating that the Fe(CN)64–/Fe(CN)63– redox couple can effectively enhance the electrochemical performance of electrode materials. An asymmetric supercapacitor (ASC) CuZnNi–MOF//PEDOT-AC (poly(3,4-ethylenedioxythiophene)-activated carbon) was further assembled and tested in 3 M KOH + 0.05 MK4Fe(CN)6 electrolyte. The ASC shows a high energy density of 25.2 W h kg–1, a maximum power density of 8 808 W kg–1, and also superb cycling performance. Moreover, two assembled ASCs in series connection are found to be able to light up a red light-emitting diode for at least 20 min.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
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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ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Longsheng Zhang,Qianwei Ding,Yunpeng Huang,Huahao Gu,Yue-E Miao,Tianxi Liu
The practical applications of transition metal oxides and hydroxides for supercapacitors are restricted by their intrinsic poor conductivity, large volumetric expansion, and rapid capacitance fading upon cycling, which can be solved by optimizing these materials to nanostructures and confining them within conductive carbonaceous frameworks. In this work, flexible hybrid membranes with ultrathin Ni(OH)2 nanoplatelets vertically and uniformly anchored on the electrospun carbon nanofibers (CNF) have been facilely prepared as electrode materials for supercapacitors. The Ni(OH)2/CNF hybrid membranes with three-dimensional macroporous architectures as well as hierarchical nanostructures can provide open and continuous channels for rapid diffusion of electrolyte to access the electrochemically active Ni(OH)2 nanoplatelets. Moreover, the carbon nanofiber can act both as a conductive core to provide efficient transport of electrons for fast Faradaic redox reactions of the Ni(OH)2 sheath, and as a buffering matrix to mitigate the local volumetric expansion/contraction upon long-term cycling. As a consequence, the optimized Ni(OH)2/CNF hybrid membrane exhibits a high specific capacitance of 2523 F g–1 (based on the mass of Ni(OH)2, that is 701 F g–1 based on the total mass) at a scan rate of 5 mV s–1. The Ni(OH)2/CNF hybrid membranes with high mechanical flexibility, superior electrical conductivity, and remarkably improved electrochemical capacitance are condsidered as promising flexible electrode materials for high-performance supercapacitors.
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高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 10
·2745-2751
·
IF 4.853
Xinyang Guo,Fei Xue,Shikai Xu,Shaohua Shen,Hongwen Huang,Maochang Liu
Graphical How do you wave ? In this work, we realized the coupling of localized photothermal effect into a cocatalytic material by developing a unique core-shell Cu@Ni nanoplate cocatalyst for efficient photocatalytic H 2 production from water. Specifically, Cu nanoplate could induce localized hot spots on Ni nanoparticles via a visible-light-driven surface plasma resonance effect. As a result, photogenerated electrons transferred from g-C 3 N 4 to Ni, could be elevated to a more energetic state, leading to a substantially improved photocatalytic activity. The general moderate reaction condition in solar photocatalytic hydrogen production (i. e., near ambient pressure, room temperature) makes interfacial mass and energy transfer extremely slow, even by employing a cocatalytic material (usually in the form of noble metal nanoparticles or their counterparts). Herein, by fabricating well-defined Cu@Ni core-shell nanoplate cocatalyst and further incorporating it with a g-C 3 N 4 photocatalyst, we demonstrate that interfacial processes could be significantly improved by coupling localized photothermal effect into a cocatalyst. Specifically, Cu nanoplate can induce localized strong hot spots on Ni nanoparticles via a visible-light-driven surface plasma resonance effect. As a result, photogenerated electrons transferred from g-C 3 N 4 to Ni, could be elevated to a more energetic state, leading to a substantially improved photocatalytic activity toward H 2 evolution from water. The highest hydrogen generation rate reaches 55 μmol h −1 g −1 , 110 times of that pristine g-C 3 N 4 . This work indicates that photoelectric and photothermal effects can be effectively coupled by integrating metal hetero-nanoparticles.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yanxue Guan,Juan Qin,Xinyue Guo,Zongjia Li,Haoran Guo,Miaomiao Zhang,Bailin Zhang,Jilin Tang
Nickel-aluminum layered double hydroxides (Ni-Al LDHs) are widely used in energy storage and conversion devices, and the impact of the Ni/Al molar ratio on the structural evolution and kinetic process is of great significance for improving reaction kinetics and efficiency. In this paper, the morphological evolutions and nanomechanical property changes of Ni-Al-n LDH (n is the Ni/Al molar ratio) nanosheets during potential cycling were explored by in situ electrochemical atomic force microscopy. The conversion of Ni2+ into Ni3+ and the amphoteric properties of Al3+ during potential cycling resulted in the dissolution of Ni-Al-n LDH nanosheets. The dissolution rate of Ni-Al-2 LDH nanosheets was slower than those of Ni-Al-2.5 LDH and Ni-Al-3 LDH nanosheets. Meanwhile, the Young’s modulus value of the dissolved area was much larger than that of the undissolved area, and the dissolved area exhibited a harder property. It was attributed to the different microcrystalline structures of Ni-Al LDH nanosheets affected by the Ni/Al molar ratio and the rearrangement of Ni2+ and Al3+ during the reaction. The slow dissolution of Ni-Al-2 LDH nanosheets was beneficial to improving the electrochemical performance, while the fast dissolution of Ni-Al-2.5 LDH and Ni-Al-3 LDH nanosheets was not conducive to the electrochemical performance. Understanding the effect of the Ni/Al molar ratio on the morphological evolutions and nanomechanical property changes of Ni-Al LDH nanosheets during potential cycling has important guiding significance for the subtle compositional modification and structural design of Ni-Al LDHs as an electrode material.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yang Xia,Jiaojiao Li,Zhen Xiao,Xiaozheng Zhou,Jun Zhang,Hui Huang,Yongping Gan,Xinping He,Wenkui Zhang
All-solid-state lithium batteries (ASSLBs) paired with an argyrodite sulfide solid electrolyte have become a candidate to take the world by storm for achieving high energy and safety. However, the undesirable interface design between a sulfide solid electrolyte and cathode is difficult to address its scalability production challenge. Particularly, the inferior interfacial contact between a sulfide solid electrolyte and cathode is an intractable obstacle for the large-scale commercial application of ASSLBs. Herein, an elaborately designed conformally in situ integration of a sulfide solid electrolyte onto a Ni-rich oxide cathode is proposed to overcome this issue through a facile tape casting method. In this unique integrated electrode structure, the sulfide solid electrolyte intimately makes contact with the Ni-rich oxide cathode, which significantly strengthens the solid–solid interfacial compatibility, as well as decreases the interfacial reaction resistances, thereby enabling rapid Li+ transportation and a stable interfacial structure. As a result, ASSLBs consisting of a sulfide solid electrolyte-integrated Ni-rich oxide cathode and Li anode exhibit high discharge capacity, excellent cyclic stability, and remarkable rate performance, which are superior to the cells with segregated structures composed of a Ni-rich oxide cathode, sulfide solid electrolyte, and Li anode. The features clearly indicate that the advanced interfacial contact between the cathode and solid electrolyte is responsible for ASSLBs with low polarization and fast reaction kinetics. Therefore, this work provides a rational proof-of-concept fabrication protocol for the reliable interfacial structure design of high-performance ASSLBs.
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高影响因子
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yumeng Lian,Yi Wang,Dun Zhang,Likun Xu
Developing a stable and reusable material for antibacterial application in an enzyme-like system is still a challenge. Herein, Mn–Co–S–Se (MnCo 2 S x Se 4–x )/Ni foam (NF) are synthesized by introducing S 2– and Se 2– in MnCo 2 O 4 /NF with a facile hydrothermal approach. With the different molar ratios of S/Se, the surface morphology of MnCo 2 S x Se 4–x /NF shows different growth and the catalytic activity also presents regular changes. MnCo 2 S 3.1 Se 0.9 /NF possesses a high enzyme-like ability with higher V max than natural horseradish peroxidase . Due to the outstanding peroxidase-like activity, MnCo 2 S 3.1 Se 0.9 /NF also exhibits broad-spectrum bactericidal performance towards Escherichia coli and Staphylococcus aureus which stems from the formation of ·O 2 – from H 2 O 2 . In the reutilization experiment, the enzyme-like activity keeps a stable value after 25 cyclic tests and the bactericidal performance is still stable after 10 cyclic tests, proving that MnCo 2 S 3.1 Se 0.9 /NF possesses relative stability and reusability. This research showed the great prospect of new energy and environmental catalysis.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
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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高影响因子
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