JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Naizhang Xu,Bowei Cai,Qi Li,Yubing Liu,Jie Tang,Kaiqiang Wang,Bolian Xu,Yining Fan
The covalent triazine frameworks (CTFs) have recently become a new generation of organic semiconductor for photocatalytic hydrogen production from water splitting because of their great application potentials. However, the CTFs need to be combined with noble-metal-cocatalysts to achieve photocatalytic water splitting. Herein, we reported the noble-metal-free Ni 2 P/CTF composites as an efficient catalyst for photocatalytic hydrogen evolution . With increasing the Ni 2 P alloy loading on the surface of CTF, the photocatalytic activity increases obviously and then decreases gradually, and the highest photocatalytic H 2 evolution rate is achieved for 2.8%Ni 2 P/CTF, which is almost the same as that of 3.0%Pt/CTF photocatalyst. It has been revealed that the Ni 2 P alloy act as a cocatalyst for effectively suppressing the recombination of photogenerated electrons and holes, promoting the separation and migration of the charge carriers, thereby improving the efficiency of photocatalytic H 2 evolution. This work provides a promising strategy for preparation of cheap and stable photocatalytic system based on CTF for efficient photocatalytic hydrogen evolution under visible-light irradiation.
研究领域:
材料化学
·
光催化
·
能源化学
·
半导体物理
·
可持续能源
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Chunying Fan,Bobo Wang,Tianle Wu,Qinchun Kang,Huishuang Wang,Jiajia Sun,Xiaofeng Wei
Nickel-catalyzed radical relayed dicarbofunctionalizations of olefins, utilizing carbon electrophiles as coupling partners, present a powerful strategy for the streamlined construction of aliphatic structures. However, traditional solution-phase methods encounter challenges such as the need for bulk solvents, limited coupling partners, long reaction times, and air-/moisture-sensitive reagents. As an alternative strategy, ball-mill-enabled metal-catalyzed cross-coupling reactions have gained attention due to their high reactivity and atomic efficiency. While many ball-mill-enabled cross-coupling reactions are limited to single- and two-component methodologies, three-component solid-state cross-coupling reactions remain relatively scarce. In this work, we report the first, to our knowledge, ball-milling-enabled Ni-catalyzed reductive dicarbofunctionalization of alkenes. Two distinct readily available electrophiles, Csp 2 and Csp 3 halides, are simultaneously installed across a variety of olefins at room temperature in a highly regioselective manner withing 1.5 h. By harnessing the benefits of ball milling and radical relayed reactions, we anticipate further advancements in sustainable and efficient synthetic methodologies.
研究领域:
有机化学
·
绿色合成
·
金属催化
·
自由基化学
·
机械化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xiaoyun Zhang,Panpan Zhang,Tianyi Zeng,Zhenlu Yu,Xingyu Qu,Xiaoqi Peng,Yu Zhou,Xiaoguang Duan,Aichun Dou,Mingru Su,Yunjian Liu
The structural instability of high-nickel materials severely limits their commercial applications. In this article, a one-step high-temperature solid-phase sintering method is applied to form a Ta2O5 protective layer on the surface of LiNi0.8Co0.15Al0.05O2 (NCA) with Ta5+ entering the lattice, which achieves the double-effect of coating and doping. The Ta2O5 protective coating can inhibit the side reaction between the electrode material and electrolyte, and Ta5+ doping can relieve the Li+/Ni2+ disorder ratio. These significantly enhance the structural stability of NCA. The obtained NCA-Ta2O5 displays an excellent capacity retention rate (94.46%, at 1C after 200 cycles), which is much better than that (60.97%) of the pristine NCA. The exploration of structural evolution reveals that NCA-Ta2O5 can maintain a good spherical structure without obvious cracks after 200 cycles at 1C, while the original NCA has a serious structural collapse. Besides, NCA-Ta2O5 presents outstanding discharge capacity (151.02 mAh g–1 vs NCA: 131.70 mAh g–1) at a high rate of 10C. This work provides ideas for improving the performance of high-nickel materials, which is of great significance to the optimization of the cathode material for lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
锂离子电池
·
能源材料
·
固态化学
·
电极材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Youpeng Li,Miao Liu,Shuang Hou,Pu Wang,Xuexue Pan,Meixiang Xie,Yongxin Chen,Lingzhi Zhao
In this work, a novel urchin-like CuCo 2 O 4 directly grown on three-dimenstional (3D) Ni foam as a binder-free anode materials of lithium-ion batteries via one-step solvothermal method followed by subsequent annealing. The microstructure and phase composition were characterized systematically. The result indicated that the product at a calcination temperature of 550 °C yielded the most outstanding electrochemical properties with incredible reversible specific capacity of 1700 mAh/g after 100 cycles at 200 mA/g and extraordinary rate performance of 1250 mAh/g at 1000 mA/g. The likely contributing factors to the glorious electrochemical performance of the product were related to the unique urchin-like structure containing one-dimenstional (1D) nano-needles, which could tolerate the volume effect during the Li + insertion/extraction process and provide more channels for the transmission of electron and ions, as well as the introduction of Ni foam accelerating the transmission rate of electron.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Long Zhang,Dongsheng Yang,Lilei Miao,Chunmeng Zhang,Jiexiang Li,Jiawei Wen,Chunxia Wang,Tiantian Cao,Guoyong Huang,Shengming Xu
The nickel-rich layered cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) has high energy density , lower cost and is a promising cathode material currently under development. However, its electrochemical and structural stability is poor during cycling. Among the many modification methods, cation doping has been consistently proven to be an effective strategy for enhancing electrochemical performance . Herein, the NCM811 cathode material was modified by solid-phase reactions with Mg and Al doped. In addition, the corresponding mechanism of NCM811 cathode material-doped modification is explored by density functional theory (DFT) calculations, and we have extended this approach to other ternary cathode materials with different ratios and obtained universal laws. Combined with DFT calculations, the results show that Mg 2+ occupies the Li + site and reduces the degree of Li + /Ni 2+ mixture; Al 3+ acts as a structural support during charging and discharging to prevent structural collapse. The electrochemical properties were tested by an electrochemical workstation and the LAND system, and the results showed that the capacity retention rate increased to varying degrees from 63.66% to 69.87% and 89.05% for NCM811-Mg and NCM811-Al at room temperature after 300 cycles, respectively. This study provides a theoretical basis and design strategy for commercializing cationic-doped modification of nickel-rich cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
计算材料学
·
无机固体化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Lei Wu,Yan Liu,Dengke Zhang,Liwei Feng,Wenchao Qin
Layered LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM 622) cathode materials were synthesized through spray-drying method with different pressure treatments (0, 2, 3, 4 MPa). The results of XRD and XPS showed that the LiNi 0.6 Co 0.2 Mn 0.2 O 2 with 3 MPa treated presented lower level of cation mixing. And it also led to the increase of lithium interlayer spacing and the decrease of transition metal interlayer slab. It exhibited high specific capacity of 168 mA h g -1 at 0.5 C and 130 mA h g -1 at 10 C. After 150 cycles at 10 C, the retention also maintained above 85.1%. The sample treated with 3 MPa possessed superior lithium-ion diffusion ability and lithium ion diffusion coefficient were nearly three times than that of the untreated sample. The results illustrated that pressure-treatment was a practical approach for LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathodes to improve the electrochemical performance .
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zixiang Gao,Jun Liu,Ying Wang,Yuqiong Zhao,Guoqiang Li,Wenzhe Si,Yuefeng Liu,Guojie Zhang
Activated carbon (AC) adsorbents are extensively utilized for the adsorption and elimination of volatile organic compounds (VOCs), such as styrene, owing to their remarkable adsorption capacity and cost-effectiveness. However, the regeneration and reutilization of activated carbon face significant limitations due to incomplete cleavage of styrene and carbon accumulation during heated styrene cracking. This research focuses on the preparation of Ni-Fe bimetal-enriched adsorbent columns by successfully loading transition metals Ni and Fe onto activated carbon saturated with styrene adsorption using a simple impregnation method. A series of characterizations were conducted to unveil the formation process of active sites in the alloy phase and the mechanism behind the synergistic anti-accumulation effect of Ni and Fe on carbon deposits. Furthermore, the adsorption performance of the regenerated activated carbon for styrene was evaluated. The results revealed the formation of Fe 0.64 Ni 0.36 and Ni-Fe alloy (Kamacite) phases on the activated carbon carriers, which enhanced the cracking of styrene and exhibited superior anti-carbon accumulation properties. The styrene adsorption capacity of the synthesized bimetallic 2.5Fe-2.5Ni-900 regenerated sample reached 407.5 mg/g, approximately 1.5 times higher than that of the monometallic samples 5Fe-900 and 5Ni-900, and 1.6 times higher than that of the unmodified activated carbon RAC-900. Furthermore, kinetic studies indicated that the adsorption process of styrene by the samples followed a multilayer adsorption mechanism, predominantly governed by physical adsorption. Intra-pore diffusion was identified as the primary rate-determining step during the adsorption process. Moreover, after three regenerative adsorption cycles, the decrease in styrene adsorption capacity for the 2.5Fe-2.5Ni-900 sample was below 20 %. This study presents novel perspectives and methodologies for addressing the regeneration challenge of activated carbon saturated with styrene adsorption.
研究领域:
环境化学
·
吸附科学
·
材料再生
·
大气污染控制
·
环境功能材料
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Hongsheng Yu,Suhang Chen,Xiaodong Yu,Wei Zhang,Christian Paravan,Luigi T. DeLuca,Ruiqi Shen
The slow regression rate induced by the difficulty of pyrolysis has limited the practical application of hydroxyl-terminated polybutadiene (HTPB)-based fuels for hybrid rocket propulsion. A possible strategy is the use of suitable transition metal elements promoting polymer matrix thermal decomposition of fuels. This paper investigates the effects of nickel acetylacetonate, Ni(acac) 2 , on the thermal stability and combustion of HTPB-based fuel formulations. The presented experimental results show that the addition of Ni(acac) 2 can intensely decrease the thermal stability of HTPB thus enhancing the solid fuel regression rate even at a small additive mass fraction: under an oxygen mass flux of 50 kg/m 2 s, HTPB + 5 wt% Ni(acac) 2 shows a 25.5% increase over the non-loaded baseline. Kinetics analyses reveal that the catalytic effect is mainly induced by the Ni 2+ in Ni(acac) 2 at the early stage of decomposition, and by the NiO produced from the oxidative decomposition of Ni(acac) 2 in the fuel final degradation stage. On the other hand, the addition of Ni(acac) 2 decreases the combustion heat of HTPB-based fuels significantly and implies the accumulation of its decomposition products (much metal Ni, moderate elemental C, and a little NiO.) at the fuel regressing surface. Eventually, when the content of Ni(acac) 2 exceeds 5 wt%, the growth of regression rate slows down rapidly, and a performance detriment occurs at 40 wt%. This study verifies the catalytic effect of Ni(acac) 2 on polymer matrix for HTPB based fuels showing the attractive regression rate performance of this additive.
研究领域:
推进剂化学
·
燃烧学
·
高分子材料科学
·
航天动力工程
·
催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 83
·35352-35364
·
IF 7.139
Zhichao Yu,Wei Zhang,Yongxi Zhang,Yaokun Fu,Ying Cheng,Sanyang Guo,Yuan Li,Shumin Han
Magnesium hydroxide (MgH 2 ) has excellent reversibility and high capacity, and is one of the most promising materials for hydrogen storage in practical applications. However, it suffers from high dehydrogenation temperature and slow sorption kinetics. Rare earth hydrides and transition metals can both significantly improve the de/hydrogenation kinetics of MgH 2 . In this work, MgH 2 –Mg 2 NiH 4 –CeH 2.73 is in-situ synthesized by introducing Ni@CeO 2 into MgH 2 . The unique coating structure of Ni@CeO 2 facilitates homogeneous distribution of synergetic CeH 2.73 and Mg 2 NiH 4 catalytic sites in subsequent ball milling process. The as-fabricated composite MgH 2 -10 wt% Ni@CeO 2 powders possess superior hydrogenation/dehydrogenation characteristics, absorbing 4.1 wt% hydrogen within 60 min at 100 °C and releasing 5.44 wt% H 2 within 10 min at 350 °C. The apparent activation energy of MgH 2 -10 wt% Ni@CeO 2 is determined to be 84.8 kJ/mol and it has favorable hydrogen cycling stability with almost no decay in capacity after 10 cycles.
研究领域:
材料科学
·
无机化学
·
能源化学
·
纳米催化
·
氢能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Wangning Zhang,Waqar Uddin,Gang Hu,Lin Hu,Zhaohui Fang
A novel method for identification of four isomers of dihydroxynaphthalene (DHN) was reported by their different perturbation effects on a Briggs-Rauscher (BR) oscillating system. In the system, macrocyclic nickel (II) complex NiL(ClO 4 ) 2 is used as the catalyst, where the ligand L in the complex is 5,7,7,12,14,14‑hexemethyl‑1,4,8,11‑tetraazacyclotetradeca‑4,11‑diene. By putting equal amount of the same concentrations of four isomers (1,4‑dihydroxynaphthalene (1,4-DHN), 1,5‑dihydroxynaphthalene (1,5-DHN), 2,3‑dihydroxynaphthalene (2,3-DHN) and 2,7‑dihydroxynaphthalene (2,7-DHN)) into BR system, the system could or couldn't be perturbed, being reflected in quite different oscillating behaviors after addition of isomers. These four isomers were identified in their concentration range of 5.0 × 10 −6 to 2.5 × 10 −4 mol/L. An explanation of such perturbation mechanism is that, 1,4-DHN couldn't be oxidized by BR matrix, but 1,5-DHN, 2,3-DHN and 2,7-DHN could be oxidized by HOO to yield 5‑Hydrox‑1,4‑naphthoquinone, phthalic acid and 6,7‑dihydroxyperylene‑1,12‑quinone (DHPQ), respectively.
研究领域:
分析化学
·
物理化学
·
化学生物学
·
反应动力学
·
分子识别
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhixin Yao,Yuandong Peng,Chao Xia,Xuwu Yi,Shenghua Mao,Miantuan Zhang
The effect of calcination temperature on the coating layer and the phase of the alloy matrix is the main problem to improve the heat treatment process of SMCs and obtain excellent magnetic properties . In this study, FeNiMo@Al 2 O 3 powders which were coated by sol-gel and calcined at 900–1300 °C were prepared and these powders were pressed into SMCs. The results showed that the surface of the powder was uniformly coated with Al 2 O 3 . As the heat treatment temperature increases, the phase of the coating changed from AlOOH to γ-Al 2 O 3 , δ-Al 2 O 3 , θ-Al 2 O 3 , and α-Al 2 O 3 . Meanwhile, the new phase γ-Fe, Ni appeared in the alloy matrix. The magnetic permeability of the sample is very stable in the frequency range of 10–500 kHz. The magnetic loss decreases first and then increases, with a minimum at 1100 °C. The permeability and magnetic loss of the sample pressed from the powder obtained by calcination at 1100 °C are 321.78 mw/cm 3 and 87.61 (50 kHz, 100 mT) at the typical industrial application conditions of Iron–Nickel SMCs. The microstructure and the magnetic properties show that the obtained α-Al 2 O 3 have excellent insulation and heat resistance. This resulted in a significant reduction in core losses of FeNiMo SMCs.
研究领域:
材料科学
·
磁性材料
·
无机非金属材料
·
粉末冶金
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 7
·3642-3656
·
IF 2.302
Long Lu,Yao Yadong,Yan Minglei,Wang Hongjing,Zhang Guanggao,Kong Menglai,Yang Lin,Liao Xiaoming,Yin Guangfu,Huang Zhongbing
Ni 3 S 2 @polypyrrole/nickel foam (Ni 3 S 2 @PPy/NF) composite was successfully synthesized by combining a facile hydrothermal synthesis and a simple electrochemical-deposited process. For comparative study, the honeycomb-shaped Ni 3 S 2 had in situ been grown on NF without the addition of any nickel salt to obtain the Ni 3 S 2 /NF composite. The electrochemical measurement results show that the area capacitance of the Ni 3 S 2 @PPy/NF electrode is 1.13 F cm −2 that is slightly lower than 1.26 F cm −2 of the Ni 3 S 2 /NF electrode at a high current density of 30 mA cm −2 , yet its rate capability and cycling stability are far better than those of the Ni 3 S 2 /NF electrode. Meanwhile, an asymmetric supercapacitor on the basis of the Ni 3 S 2 @PPy/NF anode and the AC cathode exhibits a high energy density and power density of 17.54 Wh kg −1 and 179.33 W kg −1 at 2.5 mA cm −2 , respectively; besides, the energy density is still 8.67 Wh kg −1 at a power density of 3587.41 W kg −1 even at 50 mA cm −2 . Moreover, the capacitances of the device remain unchanged after 3000 galvanostatic charge/discharge cycles at a high current density of 30 mA cm −2 . Furthermore, two such 1 cm 2 devices connected in series can light five 40-mW LED indicators or power one of the same-power LED indicator for 20 min after being fully charged. The results demonstrate that our asymmetric supercapacitor has a promising potential in commercial applications.
研究领域:
电化学
·
材料科学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）