Inorganic Chemistry Frontiers
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2017
·Vol. 5
·期 1
·172-182
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IF 4.036
Bingrong Wang,Yang Cao,Yong Chen,Ruzhi Wang,Xiaohong Wang,Xiaoyong Lai,Chunhui Xiao,Jinchun Tu,Shujiang Ding
NiCo2O4 nanoflowers were synthesized through a microwave-assisted hydrothermal method and used as a type support for Ni(OH)2 nanoparticles. In the three-dimensional NiCo2O4 nanoflowers, two-dimensional ultrathin nanosheets supported the Ni(OH)2 nanoparticles by homogeneous precipitation. The materials were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The electrochemical oxidation of methanol was probed through the NiCo2O4/Ni(OH)2 modification on a glassy carbon electrode in an alkaline medium by employing cyclic voltammetry (CV) and chronoamperometry (CA). The current density of the NiCo2O4/Ni(OH)2 electrode in 1 M KOH with 0.5 M methanol ascends to 92.3 A g−1 and restores to 94.6% of the primitive value through the replacement with a new solution after a long-term CV cycling (500 cycles). Therefore, the compounds further corroborate their excellent electrocatalytic activity and superb perennial stability for methanol oxidation. This study demonstrates that NiCo2O4/Ni(OH)2 is a peculiar material with an outstanding performance in direct methanol fuel cells.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Wenyu Dong,Qizhao Pan,Zhaoshun Liu,Hongbin Sun,Zhongning Shi,Junli Xu
High-entropy materials has achieved much attention in the recent decade years. However, there is few reports on high-entropy MOFs due to the large difference of coordination ability for different metal ions . In this work, high-entropy ZIFs are successfully electrodeposited on the nickel foam substrate under high overpotential, and the effects of potential, electrodeposition time and metal precursor concentration on the morphologies and catalytic activity of deposits are examined. The results indicate that the prepared HE-ZIF is made of nanoparticles with a low crystalline structure, and it shows a high electrocatalytic activities for oxygen evolution reaction (OER) as it possesses an abundance of defects such as vacancy defects , lattice distortions and amorphous structure. The overpotential at the current density of 100 mA cm −2 is 290 mV with good durability in 100 h continuous test for OER in 1 mol L −1 KOH.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yousen Wu,Ying Wang,Guozhe Sui,Dongxuan Guo,Dawei Chu,Guang Xu,Jinlong Li,Yue Li,Dong-Feng Chai
Nowadays, the inherent re-stacking nature and weak d-p hybridization orbital interactions within MXene remains significant challenges in the field of electrocatalytic water splitting, leading to unsatisfactory electrocatalytic activity and cycling stability. Herein, this work aims to address these challenges and improve electrocatalytic performance by utilizing cobalt nanoparticles intercalation coupled with enhanced π-donation effect. Specifically, cobalt nanoparticles are integrated into V 2 C MXene nanosheets to mitigate the re-stacking issue. Meanwhile, a notable charge redistribution from cobalt to vanadium elevates orbital levels, reduces π*-antibonding orbital occupancy and alleviates Jahn-Teller distortion. Doping with tellurium induces localized electric field rearrangement resulting from the changes in electron cloud density. As a result, Co-V 2 C MXene-Te acquires desirable activity for hydrogen evolution reaction and oxygen evolution reaction with the overpotential of 80.8 mV and 287.7 mV, respectively, at the current density of −10 mA cm −2 and 10 mA cm −2 . The overall water splitting device achieves an impressive low cell voltage requirement of 1.51 V to obtain 10 mA cm −2 . Overall, this work could offer a promising solution when facing the re-stacking issue and weak d-p hybridization orbital interactions of MXene, furnishing a high-performance electrocatalyst with favorable electrocatalytic activity and cycling stability.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Yimin Zhang,Youhai Cao,Dong Chen,Penglei Cui,Jun Yang
The use of Ionic Liquids (ILs) to enhance the electrocatalytic activity of metal nanoparticles has garnered sustained research interest. However, current strategies involving ionic liquids do not exploit their use and advantages in chemical synthesis of metal nanoparticles. Herein, we demonstrate a straightforward method, which combines the advantages of ILs in nanoparticle synthesis with the potentials of ILs in electrocatalysis , for the synthesis of Pd nanoclusters for electrochemical oxidation of formaldehyde. This method relies on the use of 1-(2′-aminoethyl)-3-methyl-imidazolum tetrafluoroborate ionic liquid as stabilizers to directly generate Pd nanoclusters with average sizes of 1.8 ± 0.3 nm in a reaction medium consisting of water and methanol at room temperature . The electrochemical measurements prove that the ionic liquid-assisted Pd nanoclusters have mass-normalized activity approximately 7 times than that of commercial Pd/C catalysts for the oxidation of formaldehyde.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Chengcheng Qi,Chongchao Zhang,Ziyin Yang
Defect engineering was considered as an effective strategy to regulate electrocatalytic activities of transition metal oxides . However, there are seldom reports about metal defects in electrochemical sensing. In this work, Co-defected Co 3 O 4 was synthesized via thermal treatment of glycerolatocobalt (CoGly) precursor for constructing a novel electrochemical nonenzymatic glucose sensor. The obtained nanomaterials were characterized by transmission electron microscopy (TEM), powder X-ray diffractometry (XRD), Raman spectra , X-ray photoelectron spectroscopy (XPS) and electrochemical techniques . The presence of Co defects regulated electronic structure of Co 3 O 4 , which not only speeds up electron transfer rate but also exposes more high-valent Co sites, thus improving electrocatalytic activities. Under optimized conditions, Co-defected Co 3 O 4 electrode exhibited excellent performance for glucose analysis with a wide linear range of 0.2 µM to 0.5 mM, a low detection limit of 0.16 µM. Importantly, an ultrahigh sensitivity of 2595.7 µA·mM −1 ·cm −2 was also obtained, which was about 10 times higher than that of conventional Co 3 O 4 . Therefore, engineering Co 3 O 4 with Co defects is an effective strategy to tailor electrocatalytic activity, which sheds light on the potential applications of metal defects in the field of electrochemical nonenzymatic sensing.
研究领域:
材料科学
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电化学传感
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生物医学工程
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DOI
高影响因子
SENSORS
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2019
·Vol. 20
·期 1
·140
·
IF 3.031
Yaqi Lu,Dan Wu,Ziyin Li,Quanjie Lin,Xiuling Ma,Zhangjing Zhang,Shengchang Xiang
It very important to be able to efficiently detect hydrazine hydrate in an aqueous medium due to its high toxicity. Here, we have proposed a new idea: to construct a sensor for the rapid determination of hydrazine hydrate based on the nano-CuO derived by controlled pyrolysis of HKUST-1 [Cu3(BTC)2(H2O)3]. The as-prepared CuO at 400 °C possesses a uniform appearance with nano-structure via SEM images, and the nano-CuO-400 has exhibited excellent electrocatalytic activity towards hydrazine oxidation. Amperometrici-tcurves shows the peak current as linearly proportional to the hydrazine concentration within 1.98–169.3 μmol L−1and 232–2096 μmol L−1with the detection limit of 2.55 × 10−8mol L−1and 7.01 × 10−8mol L−1, respectively. Moreover, the sensor constructed in the experiment shows good selectivities, and it is feasible to determining actual water samples.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Chunli Wang,Na Yang,Dongxue Cai,Shu-Zhong Zhan,Kun Liu
The electrocatalytic processes of hydrogen evolution reaction and hydrogen oxidation reactions have emerged as global strategies to address critical environmental and energy challenges associated with fossil fuel consumption. To enhance electrocatalytic activity, we focus on the design of novel electrocatalysts based on first-row transition metal complexes. A new nickel complex [Ni(dppe)Cl 2 ] by the reaction of NiCl 2 with 1,2-bis(diphenylphosphino)ethane (dppe) were synthesized and characterized in our group. The structure of nickel complex was determined cryptographically. The electro-catalyze hydrogen evolution (HER) activity of complex Ni(dppe)Cl 2 in acetonitrile solution with acetic acid as proton and a neutral buffer (pH 7.0) medium was evaluated by controlled potential electrolysis, with a turnover frequency (TOF) of 155 and 366 (mol of H 2 /mol of cat/h), respectively. Notably, electrocatalytic activity towards hydrogen oxidation (HOR) in acetonitrile solvent using Ni(dppe)Cl 2 as a catalyst has also been studied, and the complex exhibits highly catalytic efficiency with a TOF of 0.77 s −1 . The above results indicate that the Ni complex can be act as promising electrocatalyst for HER and HOR.
研究领域:
化学
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材料科学
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能源研究
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产品关联
DOI
高影响因子
LANGMUIR
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2019
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IF 3.683
Xuelian Yu,Wenchao Yin,Tao Wang,Yihe Zhang
One of the major challenges associated with fuel cells is exploring highly efficient and low-cost electrocatalysts for the oxygen reduction reaction (ORR). Herein, the feasibility of using Ti3C2 MXene nanoparticles (NPs) to enhance the electrocatalytic activity of g-C3N4 for ORR was investigated. By varying the content of Ti3C2 NPs, a series of g-C3N4/Ti3C2 heterostructures were obtained, displaying enhanced electrocatalytic activity, including a positive shift in both onset and peak potentials toward ORR, compared to the original g-C3N4 in basic solution. We attribute the improvement to the favorable electrical conductivity of well-dispersed Ti3C2 MXene nanoparticles and also enhanced O2 adsorption due to the electronic coupling effect between g-C3N4 and Ti3C2 in the heterostructures. This work demonstrates the potential of earth-abundant MXene family materials to construct low-cost and high-performance electrocatalysts.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2016
·Vol. 46
·期 12
·1177-1186
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IF 2.223
Guo Jie,Hou Yongjiang,Li Bo,Wang Yaquan
Abstract The Ni–B-modified carbon paste electrodes were synthesized by the electroless deposition, followed by thermal treatment. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were performed to gather information about the morphology, crystallinity, and binding energy. The fabricated Ni–B/C electrodes are applied to methanol electrooxidation in alkaline media. The results show that Ni–B/C catalyst with a comparable amount of microcrystalline Ni and Ni 3 B, 59 and 41 wt%, displayed a significantly enhanced electrocatalytic activity, which is approximately three times the activity of the unheated Ni–B/C catalyst. The synergetic mechanism of methanol oxidation was proposed that involves one Ni 3 B site favor the adsorption and activation of the methanol molecule and one Ni site for oxidative mediation of methanol. In addition, the kinetic parameters of the reaction were calculated using linear sweep voltammetry. Graphical abstract The illustration of the speculated methanol oxidation mechanism.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Nan Jia,Yaru Shi,Shuxia Zhang,Xinbing Chen,Pei Chen,Zhongwei An
The carbon supporting materials play a crucial role for improving the utilization and electrocatalytic activity of noble metal nanocrystals . In this work, the high-quality carbon nanobowls (CNBs) with high surface area are synthesized successfully by a simple sol–gel synthetic method. Then, the as-prepared CNBs are used as advanced supporting material to anchor Pd nanocrystals by a facile homogeneous precipitation–reduction method. The as-prepared CNBs supported Pd nanocrystals (Pd/CNBs) nanohybrids are examined thoroughly by various physical characterizations . Physical measurements display that the CNBs facilitate the dispersion and anchorage of Pd nanocrystals due to their high surface area and abundant O-containing surface groups. Cyclic voltammetry , electrochemical impedance spectroscopy , and chronoamperometry measurements reveal that the Pd/CNBs nanohybrids have higher electrocatalytic activity and durability for the formic acid electro oxidation than Vulcan XC-72 carbon supported Pd nanocrystals (Pd/C-72) nanohybrids and commercial Pd/C electrocatalyst .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Huan Wang,Xiangjie Bo,Yufan Zhang,Liping Guo
Sulfur-doped ordered mesoporous carbons (OMC-S-X) (X = 1, 2 and 3) with different sulfur contents were synthesized as metal-free electrocatalyst for oxygen reduction reaction (ORR). Transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectra (EDX), nitrogen adsorption–desorption, X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS) were employed to confirm the characterizations of OMC and OMC-S. The prepared OMC-S-3 exhibits high electrocatalytic activity, good stability and excellent tolerance to crossover effect for ORR. The high electrocatalytic activity of OMC-S-3 for ORR can be mainly ascribed to the doping of sulfur especially the existence of sulfide groups ( C S C ) which play an important role in promoting the ORR.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Jingyang Tian,Chundi Yang,Ruihua Hao,Funan Li,Zhirui Liu,Wei Chen,Yuancai Lv,Chong Lin
Molybdenum sulfide (MoS 2 ) as a graphene-like sheet material has attracted wide attention owing to the potential for hydrogen evolution reaction (HER). However, the large-scale application of MoS 2 is still difficult due to the inherent poor conductivity and insufficient active edge sites. Herein, we develop a simple method to grow P-doped MoS 2 nanosheets on carbon cloth for high efficiency HER. The 2D carbon cloth can prevent the stacking of MoS 2 nanosheets and improve the conductivity with the doping of P atoms. As a result, the P–MoS 2 /CC-300 shows the excellent electrocatalytic activity with an overpotential of 81 mV at 10 mA cm −2 and the lower Tafel slope of 98 mV/dec. Furthermore, it also shows the good electrocatalytic durability for 15 h. This work provides an opportunity for the design of excellent and robust MoS 2 -based catalyst via structural engineering and doping method.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）