Catalysts
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2023
·Vol. 13
·期 11
·1426
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IF 3.9
Shihu Zhu,Tiantian Liu,Shuang Yu,Huijing Yang,Qimeng Sun,Jin You Zheng
The hydrothermal method is a frequently used approach for synthesizing HER electrocatalysts. However, a weak tolerance to high temperature is an intrinsic property of carbon cloth (CC) in most situations, and CC-based catalysts, which require complex technological processes in low-temperature environments, exhibit weak stability and electrochemical performance. Hence, we provide a new solution for these issues. In this work, MoO3-NiSxfilms of 9H5E-CC catalysts are synthesized, first through electrodeposition to form Ni particles on CC and then through a hydrothermal reaction to reform the reaction. The advantages of this synthetic process include mild reaction conditions and convenient operation. The obtained MoO3-NiSxfilm presents excellent catalytic activity and stability for HER. MoO3-NiSxfilm requires only a low overpotential of 142 mV to drive 10 mA cm−2for HER in 1.0 m KOH, and the obtained 9H5E-CF film only needs 294 mV to achieve 50 mA cm−2for OER. Remarkably, they also show excellent OER, HER, and full water splitting long-term electrochemical stability, maintaining their performance for at least 72 h. This work can be expanded to provide a new strategy for the fabrication of stable, high-performing electrodes using simple, mild reaction conditions.Keywords:hydrothermal reaction;MoO3-NiSxfilm;electrodeposition and reforming reaction;anodizing
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Nano Energy
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2018
·
IF 13.12
Yuanhui Cheng,Dongming Li,Lei Shi,Zhonghua Xiang
Air-based flow batteries have triggered huge interests as promising large-scale energy storage devices due to their high energy density and extremely low cost. However, the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) lower their energy conversion efficiencies . Herein, we in situ grow amorphous NiS x -FeO y particles on sulfur doped carbon fiber paper (termed as NiS x -FeO y /SCFP) as practical self-supported oxygen electrode through a simple and economic synthesis route. Benefiting from the synergetic effects of amorphous NiS x -FeO y and SCFP, NiS x -FeO y /SCFP possesses massively accessible active sites, enhanced electrons and reactants transfer, and stable integrated structure, exhibiting a low overpotential (0.37 V) at 10 mA cm −2 for OER, a positive half-wave potential for ORR and a small potential gap (0.82 V). Zinc air flow battery assembled with newly developed NiS x -FeO y /SCFP shows a coulombic efficiency of 100% and a voltage efficiency of 50% at the charge-discharge current of 10 mA cm −2 , and vigorously operates 110 h without performance decay, showing highly catalytic activity and super cycling stability, which are among the best performance ever reported. We believe that this work will open up new ways for fabricating practical oxygen electrode for metal air based batteries applications.
研究领域:
材料科学
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电化学
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能源存储
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CATALYSIS TODAY
·
2024
·
IF 5.2
Chengfeng Yi,Jingwen Li,Zhigang Liu
NiS X stands out in the electrochemical oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) due to the favorable conductivity and diverse chemical composition. However, NiS X usually exhibits few exposed active sites and poor charge transfer kinetics. Moreover, during the electrochemical oxidation of HMF, the conductivity of the catalyst would decrease rapidly with the formation of oxidized Ni species, leading to a rapid decline in catalytic performance. Therefore, a series of NiS X /carbon black (CB) hybrids (NiS X /CB-n) were synthesized via a one-step solvent hydrothermal method in which NiS X displayed a large cubic block structure assembled from small nanosheets. Among the prepared catalysts, NiS X /CB-2, with the optimal amount of introduced CB, exhibited superior electrocatalytic activity for the oxidation of HMF, achieving 100% HMF conversion, 98% FDCA yield, and 100% Faradaic efficiency at 1.45 V (vs. RHE). The outstanding electrocatalytic activity of NiS X /CB-2 was attributed to the suitable CB doping, which not only enhanced the conductivity of catalyst but also separated the small nanosheets, preventing the formation of densely packed NiS X structure and increasing the specific surface area of catalyst, thereby exposing more active sites and improving the availability of material. Furthermore, the formation of C-S bonds facilitated charge interactions between NiS X and CB, promoting the transfer of charges during the electrolysis process and enhancing electrocatalytic kinetics. Open circuit potential tests demonstrated that the introduction of CB also strengthened the adsorption capacity of catalyst for HMF, further benefiting its electrocatalytic activity.
研究领域:
材料科学
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电化学
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Huazhen Liao,Song Ye,Haoran Zhang,Ruihao Huang,Tianning Zheng,Deping Wang
Luminescent metal organic frameworks (MOFs) based composites have potential applications for sensitive and selective detection of various substances like heavy metal cations, glucose, biogas molecules and antibiotics. In this research, the UCNCs@MOFs composites were synthesized by combing the rare earth ions doped NaYF 4 nanocrystals with ZIF-8 and UiO-66-NH2 MOFs, respectively, both of which exhibit core-satellite structures with good crystallinity, high pore volume and large specific surface area, as well as excellent upconversion luminescence performance under 980 nm excitation. The differences in the detail morphology and formation mechanism of the composites were compared based on TEM, XPS, FTIR, Zeta potential, N 2 adsorption and desorption isotherm characterizations. After loading with NiS x nanoparticles, the real-time to initial total emission intensity ratio (I/I 0 ) of Er 3+ in NaYF 4 :Yb,Er@ZIF-8/NiS x and NaYF 4 :Yb,Er@UiO-66-NH 2 /NiS x probes, and the emission intensity ratio of Tm 3+ peaked at 476 and 802 nm (I 476nm /I 802nm ) in NaYF 4 :Yb,Tm@UiO-66-NH 2 /NiS x probe can be applied to the sensitive and selective detection of H 2 O 2 , in which the last one shows the superior LOD. This research presented a universal method for the synthesis of various UCNCs@MOFs composites with tunable upconversion emission and microstructure by combing MOFs with desirable UCNCs, which may promote their applications in sensing, detection, and display.
研究领域:
材料科学
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分析化学
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生物传感
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Catalysis Science & Technology
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2021
·Vol. 11
·期 22
·7445-7453
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IF 6.119
Yijuan Wang,Ziyi Guo,Jianzhi Wang,Ningbo Yu,Yanan Xue,Faquan Yu
Crystal structure and morphology can be regulated by inducing the positioning growth of metal sulfide, which is an efficient strategy to improve the oxygen evolution activity of the anode. Herein, solid NiMoO4 nanoplate arrays were used as cages to immobilize the metal source, and Mo doped NiSx is obtained by in situ solvothermal sulfuration reaction with polysulfide as the sulfur source. The electronic structure, conductivity, crystallographic phase and microscopic morphology of oxygen evolution catalysts could be controlled simultaneously by polysulfide induced solid metal oxide sulfidation, thereby greatly improving their electrocatalytic oxygen evolution activity. Benefiting from these, the prepared Mo doped nickel-sulfur electrodes show great performance toward the oxygen evolution reaction with overpotentials of 184 mV and 240 mV at current densities of 50 and 100 mA cm−2 in alkaline electrolyte. This study provides a new pathway by polysulfide induced sulfidation based on solid metal oxide for developing metal sulfide electrode materials with high oxygen evolution reaction performance for overall water splitting.
研究领域:
材料科学
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电催化
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 31
·2201086
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IF 6.389
Zhixuan Yuan,Zilong Li,Zewei Chen,Weilong Xu,Junmin Zhu,Xiulan Li,Jinchang Xu,Yujie Peng,Yanshuo Jin,Nan Wang,Xiang Yu,Hui Meng
Hydrogen production from overall water splitting assisted by organic oxidation reforming reaction is an innovative method to improve the anode behavior. Utilizing transition metal chalcogenides where the electronic states are regulated by anion modification, hexagonal Se-NiS x pine-needle-like nanowires are prepared via a simple one-pot hydrothermal reaction without any post-processing steps. The nanowires can serve as ethanol electrooxidation reaction (EOR) catalyst with outstanding electrocatalytic activity ( j 100 = 1.36 V) and long-term durability. In the practical tests of the hybrid water splitting, the catalyst required only 1.50 V to obtain 50 mA cm −2 , and worked stably for over 50 h at a high current density of 200 mA cm −2 accompanied by an excellent selectivity ( F E = 98.0%). These demonstrate that the introduction of Se significantly improves the catalytic performance of transition-metal chalcogenides for EOR, indicating a new avenue for the design and improvement of other electrocatalysts.
研究领域:
电化学
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能源材料
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催化
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纳米材料
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氢能
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xiaoyue Chen,Yaru Wang,Xiangchao Meng
Electrocatalytic reduction of dinitrogen to produce ammonia at ambient conditions has increasingly attracted attentions. Molybdenum sulfide (MoS 2 ) exhibits promises in electrocatalysis. However, the lack of reactive sites significantly limited the electrocatalytic activity of MoS 2 when applied in the reduction of N 2 to produce ammonia. Herein, we successfully prepared a NiS x /MoS 2 heterostructural composite with abundant interfaces exposed. Moreover, the presence of metallic phase 1T-MoS 2 provided better conductivity and more active sites. Benefited from this interface design, as-prepared NiS x /MoS 2 composites exhibited excellent electrocatalytic activity in reduction of N 2 . The ammonia yield rate reached as high as 68.78 µg h −1 mg −1 cat. at −0.60 V ( vs. RHE) with a Faradic efficiency of 48.53 % at −0.50 V ( vs. RHE), as well as charming selectivity and long-term stability. The density functional theory (DFT) calculation results indicated that the heterointerface formed between NiS x /MoS 2 composites facilitated electrons transfer . And the adsorption of N 2 on the Mo site is more stable, which synergistically improves the NRR performance. This work provides new evidences of constructing heterojunction materials to accelerate electron transfer between interfaces for highly efficient electrocatalytic nitrogen reduction.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Guangjun Lv,Xin Dai,Yide Qiao,Guopan Ren,Qiang Tan,Sheng-Wu Guo,Yong-Ning Liu,Yuanzhen Chen
Challenges remain to show good capacitive performance while achieving high loadings of active materials for supercapacitors. Trying to realize this version, a nickel-protecting carbon fiber paper@Co-doped NiSx (Ni-CP@Co–NiSx) electrode with high specific gravimetric, areal, and volumetric capacitance is reported in this work. This free-standing electrode is prepared by an electroplating-hydrothermal-electroplating (EHE) three-step method to achieve a high loading of almost 26.7 mg cm–2. The cobalt-doping and nickel-protection strategies effectively decrease the impedance and inhibit the active material dropping from the electrode resulting from the expansion stress, which endows the Ni-CP@Co–NiSx electrode with a high rate and good cycling performance, especially with an ultrahigh specific areal/volumetric/gravimetric capacitance of 53.3 F cm–2/2807 F cm–3/1997 F g–1 at 5 mA cm–2, respectively. Employing activated carbon functionalized with riboflavin (AC/VB2) as a negative electrode, the asymmetric supercapacitor device delivers a very high energy density of up to 60.4 W h kg–1. This work demonstrates that electrodes with a high loading density and excellent performance can be obtained by the combination of the EHE method to adjust the internal conductivity and external structural stability.
研究领域:
材料科学
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能源存储技术
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Lan li,Jie Sun,Hao Ling,Feng Ju
NiSO4/ZnO-Al2O3-SiO2 adsorbent, as a novel reactive adsorption desulfurization (RADS)adsorbent, has self-sulfidation ability and high desulfurization performance when treating model fuel. However, the RADS performance of the adsorbent under FCC gasoline feedstock is not well understood. Here, we compare the performance of the adsorbent under FCC gasoline with model fuel to test the effect of the hydrocarbon composition of the feedstock. The complex composition of FCC gasoline makes it sensitive to the nickel loading amount of the adsorbent. Under the influence of specific surface area and pore structure, the adsorbent loaded with 3 wt% nickel shows better desulfurization activity when treating FCC gasoline. As hydrocarbons in FCC gasoline compete with sulfur compounds for active Ni sites, the reaction conditions have been tested and optimized to achieve deep desulfurization while maintaining low olefin loss to ensure the octane number of the product. By experimental tests and characterization, it has been proved that NiSx and NiO acted as active Ni sites of the adsorbent. Based on these observations, the mechanism of RADS of FCC gasoline over NiSO4/ZnO-Al2O3-SiO2 adsorbent has been proposed, which provides theoretical support for the development of new adsorbents and the optimization of RADS process.
研究领域:
化学工程
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环境科学
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石油炼制
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