CRYSTENGCOMM
·
2020
·Vol. 23
·期 1
·69-81
·
IF 3.117
Yue Zhou,Yanli Chen,Maobin Wei,Hougang Fan,Xiaoyan Liu,Qianyu Liu,Yumeng Liu,Jian Cao,Lili Yang
The exploitation of low-cost, efficient and stable electrocatalysts for overall water splitting in alkaline media is critical for future renewable energy systems, yet still remains a great challenge. Herein, we report the in situ growth of porous NiCoSe nanosheet arrays derived from 2D MOFs on Ni foam through a simple ion-exchange reaction followed by a hydrothermal process. Benefiting from the unique 2D multi-porous framework with high electrochemical active surface area, conductivity and open channels for the release of gaseous products, the as-prepared NiCoSe nanosheet arrays exhibit excellent electrochemical activity with a low overpotential of 170 mV for the hydrogen evolution reaction (HER) at 10 mA cm−2 and 278 mV for the oxygen evolution reaction (OER) at 20 mA cm−2 and long-term stability. Furthermore, the full cell only requires 1.51 V to drive the current density of 10 mA cm−2 when the NiCoSe nanosheet arrays are used as both anode and cathode, which also exhibits distinguished durability for over 48 h. The present work presents a general strategy for the rational design and synthesis of multifunctional 2D porous electrocatalysts, which is also expected to extend to other noble-metal-free catalysts.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Mingxuan Fu,Guyang Ning,Jiaxian Liu,Qi Zhang,Yuena Sun,Xinyu Fan,Haiyang Wang,Haijun Lu,Yufan Zhang,Huan Wang
What is essential to solving energy scarcity problems is that develop the high activity, durable and non-noble metal-based dual-functional electrocatalysts for hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). In this work, a series of core-shell structure M@Fe–Cu-GR nanocubes (NCs) are prepared. In the prepared process, the bimetallic FeCu prussian blue analogues (PBA) is used as precursor, transition metals ions Co 2+ and Ni 2+ are introduced into the FeCu-PBA using the exchange of potassium ions with other metal ions , and then the FeCu-PBA are successfully loaded on the graphene oxide (GO) employed the attraction of opposite charges between polydiallyldimethylammonium chloride (PDDA) and GO. Electrochemical tests show that the Tafel slope of Co–Ni@Fe–Cu–GR NCs for HER and OER are 60 and 82 mV dec −1 , respectively, and Co–Ni@Fe–Cu–GR NCs shows excellent performance in long-term stability test.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yifei Li,Zhongzhu Qiu,Meng Qu,Yuedi Wang,Haodong Wang,Junjie Jiang
Supercapacitors have the advantages of high power density, rapid charge and discharge rates, and extended cycling stability. However, their energy density and specific capacity are still inadequate to satisfy the current requirements for energy storage in the industry. The current work demonstrates the synthesis of Mo-ZIF-67/CNT composites through mechanical stirring and co-precipitation. After that, Ni, Co and Mo trimetallic sulfide/CNT composites (Ni-Co-Mo-S/CNT) are produced through further ion exchange/etching and vulcanization processes . The material has multiple valence states of three different metal ions, providing a large number of oxidation-reduction sites. The doping of CNT endows it with a unique coral-like structure, which helps to form its huge specific surface area and larger mesopores. Furthermore, the effect of vulcanization temperature on the electrochemical performance of the material is also studied. According to the results, the Ni-Co-Mo-S/CNT-180, which is vulcanized at 180 °C, exhibits the most outstanding electrochemical performance. The electrode exhibits impressive performance with a specific capacitance of 1728.6 F/g at a current density of 1 A/g. It also has good rate capability, maintaining 55.8 % of the specific capacitance when the current density increases tenfold. Finally, the prepared Ni-Co-Mo-S/CNT-180//AC asymmetric supercapacitor generated a high energy density of 43 Wh/kg at a power density of 735 W/kg. After 2000 charge-discharge cycles at a current density of 1 A/g, it maintains a capacity of 76.42 %. This study serves as a reference for researching multi-metal sulfides as electrode materials for high-performance supercapacitors.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 10
·1806884
·
IF 15.621
Chenbao Lu,Jian Yang,Shice Wei,Shuai Bi,Ying Xia,Mingxi Chen,Yang Hou,Ming Qiu,Chris Yuan,Yuezeng Su,Fan Zhang,Haiwei Liang,Xiaodong Zhuang
Electrochemically driven carbon dioxide (CO 2 ) conversion is an emerging research field due to the global warming and energy crisis. Carbon monoxide (CO) is one key product during electroreduction of CO 2 ; however, this reduction process suffers from tardy kinetics due to low local concentration of CO 2 on a catalyst's surface and low density of active sites. Herein, presented is a combination of experimental and theoretical validation of a Ni porphyrin-based covalent triazine framework (NiPor-CTF) with atomically dispersed NiN 4 centers as an efficient electrocatalyst for CO 2 reduction reaction (CO 2 RR). The high density and atomically distributed NiN 4 centers are confirmed by aberration-corrected high-angle annular dark field scanning transmission electron microscopy and extended X-ray absorption fine structure. As a result, NiPor-CTF exhibits high selectivity toward CO 2 RR with a Faradaic efficiency of >90% over the range from −0.6 to −0.9 V for CO conversion and achieves a maximum Faradaic efficiency of 97% at −0.9 V with a high current density of 52.9 mA cm −2 , as well as good long-term stability. Further calculation by the density functional theory method reveals that the kinetic energy barriers decreasing for *CO 2 transition to *COOH on NiN 4 active sites boosts the performance.
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高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Quanyao Yu,Zhixiang Zeng,Wenjie Zhao,Yongcun Ma,Xuedong Wu,Qunji Xue
Patterned hydrophobic Ni–P alloy films consisting of orderly and regular micro-nanoscale particles were fabricated through the synergistic effect of electrochemical deposition and chemical deposition. Ni–P alloy films were deposited for different times and characterized by scanning electron microscope (SEM). It was confirmed that the addition of reducing agent induced the formation of nanoscale particles, in contrast with pure Ni film deposited by single electrochemical deposition. As “point-discharge effect”, the current density was higher at the edge of the nanoscale particles, and Ni ions would be deposited at the particles through the “point-discharge effect”. Then the Ni–P alloy films grew by “reducing–discharging” process. The X-ray photoelectron spectroscopy (XPS) was used to detect the composition and valence states of these alloy films. The existence of oxidation state of element P in these films corresponding to that in H2PO3–, also gave direct evidence for the occurrence of chemical deposition, during the electrochemical deposition process. The prolongation of deposition time could provide more time for the patterned morphology to grow up. The surface roughness, evaluated by surface profilometer, increased as the deposition time extension. And these films showed gradually increased hydrophobic properties with the increase in deposition time.
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高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 6
·1845-1856
·
IF 6.367
Zhiliang Ou,Zhonghui Zhang,Changlei Qin,Hongqiang Xia,Tao Deng,Juntian Niu,Jingyu Ran,Chunfei Wu
Perovskites are good candidates as a catalyst support to enhance the catalytic performance of Ni catalysts in steam methane reforming for hydrogen production. To obtain a Ni/perovskite catalyst with a high activity and stability, different LaBO3 (B = Al, Fe, Mn), La0.7A0.3AlO3−δ (A = Ca, Ba, Ce, Zn, Sr, Mg) and La1−xMgxAlO3−δ perovskites were prepared and their role in supporting Ni catalysts was comprehensively investigated in the current work. Catalyst characterization methods, including XRD, H2-TPR, H2-TPD, XPS, TG and Raman spectroscopy, were also used to understand the underlying mechanisms. The results show that the doping of Ca, Ba, Ce and Zn in the A site of the perovskite lowers the catalytic activity, while the partial substitution of Mg and Sr could improve the activity of Ni/LaAlO3. More importantly, it is suggested that the Ni/La0.7Mg0.3AlO3−δ catalyst has an outstanding catalytic activity and resistance to carbon deposition, and there is some carbon deposited after a stability test lasting for 35 h. The excellent catalytic performance is determined to be due to the higher dispersion of active Ni, the greater the amount of surface oxygen, the stronger the interaction between the active metal and support due to the partial doping of Mg.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Shan Zhang,Ze Feng,Ranjusha Rajagopalan,Dan Sun,Chenghuan Huang,Yougen Tang,Qunxuan Yan,Yurong Ren,Haiyan Wang
Ni-rich layered cathodes have been regarded as one of the high-priority materials, but their commercial application was limited by the highly active surfaces, poor thermal stability, and irreversible phase transition. Furthermore, when they are stored in moist air, the particles can easily form an impurity layer of Li2CO3/LiOH. This inert substance hinders the transmission of lithium ions and electrons, leading to electrochemical performance deterioration. Herein, we report a simple method, namely, metaphosphate repair, which can successfully restore the degraded LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode materials and form an in situ multifunctional hybrid repaired layer of Li3PO4-YPO4-Y(PO3)3 on the secondary particle. The repaired NCM811 delivers a discharge capacity of 171.7 mAh g–1 after 100 cycles, which is much higher than those of pristine (147.6 mAh g–1) and stored degraded (116.2 mAh g–1) samples. Moreover, the restored sample could deliver a capacity retention of 92.3% after 100 cycles at 1C along with a better initial Coulombic efficiency (CE) of 88.4%. This study provides a facile strategy to revive degraded Ni-rich cathode materials and other similar layered oxide cathodes for advanced batteries.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Haihua Wu,Zhihua Wei,Junying Yin,Sen Jiang,Jiahao Wu,Shuanghao Zheng,Jinpeng He,Xin Xu,Yunfang Gao
Bimetallic sulfides have been suggested as a novel class of electrode materials for supercapacitors (SCs) due to their high conductivity, rich redox active sites and wide operating potential window. To improve the property, tremendous efforts have been devoted to controlling the morphology, structure and size of bimetallic sulfides. We report here a strategy to achieve Ni-Co sulfide hollow nanoboxes with rich lattice interfaces and widespread mesopores via ion-exchange process. The lattice interfaces in the nanoboxes play a key role in improving the performance by developing more active sites. The thin nano-shell with porous structure makes it highly permeable for efficient ion diffusion, yet shortens the electron transport pathway. Such synergistic effects endow the Ni-Co sulfide hollow nanoboxes with high specific capacity of 789.0 C g − 1 at 1 A g − 1 and excellent rate capability of 82.1% capacity retention at 20 A g − 1 . Quantitative analysis of capacitive contribution sheds light on the rapid charge-discharge kinetics. Additionally, the as-fabricated hybrid SC , using optimized Ni-Co sulfide (Ni/Co molar ratio: 1/1) as anode and active rice husk carbon as cathode, exhibits a high energy density of 46.7 Wh kg −1 at power density of 400 W kg −1 and remarkable cycling stability of 82.7% at 5 A g − 1 after 10,000 cycles, demonstrative of potential application for high-performance SCs.
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高影响因子
Nano Energy
·
2013
·
IF 0
Wei Wen,Jin-Ming Wu,Min-Hua Cao
Rapid and economical fabrications of macroporous materials are of general interest in various fields of energy storage, energy conversion, catalysis and gas sensors. In this paper, macroporous NiO/Ni powders were achieved in a flash by the direct decomposition of a metal complex, which is template-free, surfactant-free and highly effective. The metal complex was achieved by simply mixing nickel acetate, nickel nitrate, hydrazine hydrate and glycine in water. The pore size, porosity and even morphology of the porous network (three- or two-dimensional architectures) can be conveniently tuned by adjusting the composition of the complex. It is found that, the amounts of hydrazine hydrate and glycine in the reactants affected the morphology of the porous network; whilst that of nickel acetate determined the macropores . The electrochemical performance of the achieved macroporous NiO/Ni as anodes in Li-ion batteries was comparatively investigated. The 3D macroporous NiO/Ni powders exhibited better electrochemical performances than that of 2D macroporous NiO/Ni and 3D compact NiO/Ni because of its better electrical conductivity and unique porous architecture. The presence of Ni and the continuous network of 3D structures improved the electrical conductivity of electrode materials. In addition, the macroporous architectures not only favored the ingress of electrolytes but also compensated the large volume change of the active materials during the cycling.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Sehrish Mehdi,Yanyan Liu,Huijuan Wei,Hao Wen,Ruofan Shen,Zhikun Peng,Huanhuan Zhang,Xianli Wu,Chengming Wang,Shuyan Guan,Tao Liu,Baojun Li
Zeolitic imidazole framework (ZIF-67)-derived Co metal catalysts have gained attention as competitive catalysts due to their high metal loading and superior metal dispersion. However, the problems of Co cluster aggregation during use and difficulty in collection of the powder catalyst from the reaction system need to be solved. In this work, Co-based nanoparticles (NPs) are fabricated on a Ni foam. The monolithic catalyst, Co–NC/NF, has been prepared by the pyrolysis of the ZIF-67/NF precursor using manual coating. The characterization confirms the embedding and uniform distribution of Co NPs (10–20 nm) in the N-doped C matrix. The optimized Co–NC/NF600 reveals satisfactory catalytic activity upon hydrolysis of ammonia borane with a hydrogen evolution (rB = 1176 mL min–1 g–1Co), a turn over frequency (TOF = 180 h–1), and an apparent activation energy (Ea = 64 kJ mol–1). The catalytic activity of Co–NC/NF600 with Co and CoOx as active sites has the best rank among the previously reported Co monolithic catalysts. The superior stability and reusability of the catalyst with ∼ 90% retention after five uses are demonstrated under mild NH3BH3 hydrolysis conditions, originating from the high antiaggregation ability of the active sites and the easy recollection of the catalyst. The adopted novel strategy has the potential to synthesize monolithic catalysts applicable in other fields of heterogeneous catalysis in industrial applications such as energy storage and conversion.
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高影响因子
RARE METALS
·
2020
·Vol. 40
·期 7
·1753-1761
·
IF 2.161
Li Jiang-Wei,Song Qi,Li Jiang-Bing,Yang Sheng-Chao,Gao Yan-Shan,Wang Qiang,Yu Feng
Abstract For better performances of Ni-based catalysts at low temperatures, Ni/SiC catalyst doped with a little amount of additive La was successfully prepared. The catalytic CO methanation activity tests showed that 3%La–Ni/SiC catalyst was excellent at a low reaction temperature (95.9% CO conversion and 85.1% CH 4 selectivity at 250 °C) with a superior stability compared with Ni/SiC (3.4% CO conversion and 0% CH 4 selectivity at 250 °C). This can be attributed to that the addition of La can markedly improve the dispersibility of active metal Ni and reduce the particle sizes of Ni nanoparticles or clusters, and can also regulate the interaction between active components and supports. Moreover, the high thermal conductivity and thermal stability could avoid the generation of hot spots in the catalyst bed. These results will promote the development of highly active Ni-based catalysts for the low-temperature methanation reaction. Graphic Abstract
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Waqar Uddin,Sajid ur Rehman,Muhammad Adnan Aslam,Shafiq ur Rehman,Mingzai Wu,Manzhou Zhu
Impedance matching has a key role in strong microwave absorption. To achieve the perfect impedance matching and enhanced interface dielectric relaxation, nickel-doped rGO@MoS 2 composite has been prepared. The complex permittivity and complex permeability of rGO@Ni-MoS 2 show significant improvement by the combination of the high magnetocrystalline anisotropy of Ni metal with highly conductive reduced graphene oxide, leading to remarkable microwave absorption. The prepared rGO@Ni-MoS 2 achieved maximum microwave absorption of −40 dB at 2 mm thickness. The control samples of MoS 2 , Ni-MoS 2 and rGO@MoS 2 indicate that micro-cluster of MoS 2 and Ni doping is indeed helpful to improve the performance of rGO@Ni-MoS 2 . The study provides a pathway for practical applications of microwave absorption materials in terms of impedance matching.
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高影响因子
危险品化学品经营许可证（带存储）