ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xiaomei Ning,Yifan Wei,Zhiqiang Tang,Silin He,Xiaoting Chen,Kaitong Yan,Liang Zhan
The catalytic efficiency of the formic acid electro-oxidation reaction (FAOR) and glycerol electro-oxidation reaction (GOR) using a Pt catalyst was substantially enhanced by adding 7,7,8,8-tetracyanoquinodimethane (TCNQ) dissolved in acetonitrile solution (ACN) into the reaction solution. The dynamic structure of TCNQ(ACN) and blank ACN modified Pt catalysts, along with their impacts on the performances in FAOR and GOR were analyzed. A strong relationship was established between the performance of FAOR and GOR and the modifier concentration in the reaction solution. ACN exerted a geometric blocking effect on Pt, thereby considerably improving the direct dehydrogenation process of FAOR. Based on ACN, the performance of the dehydrogenation process of FAOR and GOR was further boosted for the surface electron-rich Pt catalyst due to modification with additional TCNQ modifier. Additionally, the resistance to CO poisoning of modified Pt catalyst was notably improved, and the onset potential decreased from 0.656 V of the unmodified Pt to 0.583 V for a specific amount of TCNQ(ACN) modified Pt catalyst. This study offers a novel perspective to optimize the catalytic performance of the catalyst.
研究领域:
化学
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催化科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Xiaomei Ning,Xiaosong Zhou,Jin Luo,Liang Zhan
Pt modified by Bi had a great improvement for its catalytic performances. Herein, Bi-modified Pt was directly supported on carbon cloth (CC) as an efficient flexible electrode without using polymer binder. The catalyst structure of CC-based electrodes and their catalytic performances in glycerol and formic acid electro-oxidation reactions (GOR and FOR) were systematically studied. The research results indicated that Bi blocked certain sites of Pt, which limited the formation and adsorption of toxic products and intermediates. Bi-modified Pt on CC electrode had higher current density, better stability, and improved selectivity of dehydrogenation process in FOR and higher selectivity of glyceric acid in GOR. The electron enriched Pt resulting from Bi electron transfer and the increased bismuth hydroxide were in favor of the electro-oxidation catalytic performances. On the basis of introducing Bi, the added glucose was further beneficial to the performance due to the improved interaction between metal and CC.
研究领域:
材料科学
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电化学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Guangya Hou,Zhongwei Shen,Yiping Tang,Qiang Chen,Huazhen Cao,Huibin Zhang,Guoqu Zheng,Jianli Zhang
Direct methanol fuel cells and direct urea fuel cells are significant for mitigating the energy crisis and protecting the environment. However, as the common critical anodes for the electrooxidation of methanol and urea, most Ni-based catalysts are severely poisoned by the CO group, resulting in a decrease in current densities and stability of fuel cells. Herein, efficient bacterial cellulose (BC)-derived carbon aerogel loaded with Ni-based catalyst and WC nanoparticles co-catalyst was developed for the electrooxidation of methanol and urea. As a result, the catalytic electrode exhibits high electrocatalytic activity for methanol electrooxidation (105.7 mA cm −2 at 0.8 V) and urea electrooxidation (90.4 mA cm −2 at 0.8 V). The synergistic effect between Ni and WC can significantly weaken the surface adsorption of CO on the electrode to obtain excellent and durable electrochemical performance. For methanol oxidation reaction and urea oxidation reaction, the retentions of the peak current density after 2000 cycles in the original electrolytes are 48.94% and 74.79%, respectively. Moreover, applying the new electrolyte, the peak current density can return to 88.42% and 84.4% of the original value.
研究领域:
材料科学
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能源科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
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2016
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IF 2.322
Yuhang Xie,Hulin Zhang,Guang Yao,Saeed Ahmed Khan,Xiaojing Cui,Min Gao,Yuan Lin
In this paper In 2 O 3 nanoshells have been synthesized via a facile hydrothermal approach. The nanoshells can be completely cracked into pony-size nanocubes by annealing, which are then used as a support of Pt catalyst for methanol and ethanol electrocatalytic oxidation . The prepared In 2 O 3 and supported Pt catalysts (Pt/In 2 O 3 ) were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), field effect scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry and electrochemical impedance spectroscopy (EIS) were carried out, indicating the excellent catalytic performance for alcohol electrooxidation can be achieved on Pt/In 2 O 3 nanocatalysts due to the multiple active sites, high conductivity and a mass of microchannels and micropores for reactant diffusions arising from 3D frame structures compared with that on the Pt/C catalysts.
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 Materials Chemistry A
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2014
·Vol. 2
·期 12
·4384-4390
·
IF 0
Jing-Jing Lv,Jie-Ning Zheng,Shan-Shan Li,Li-Li Chen,Ai-Jun Wang,Jiu-Ju Feng
In this report, well-dispersed porous Pt–Pd nanodendrites (Pt–Pd NDs) were synthesized at high yield by a simple, one-pot, wet chemical method without using any seed, template, or toxic organic solvent. Poly(vinylpyrrolidone) (PVP) and urea were employed as the co-stabilizing and co-structure-directing agents. It was found that the reaction temperature, the amount of PVP and urea, the Pt/Pd molar ratio, and the pH value of the reaction media greatly affected the size and shape of the Pt–Pd product. The as-prepared Pt–Pd nanocrystals had a larger active surface area, superior catalytic activity, and better stability for the electrooxidation of methanol and ethylene glycol (EG), compared with the commercial Pt-black and Pd-black catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
JOURNAL OF THE ENERGY INSTITUTE
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2016
·
IF 1
Nan Li,Wei-Yan Xia,Chang-Wei Xu,Shuang Chen
This study investigated Pt/C and Pd/C catalysts promoted by Au for glycerol electrooxidation in alkaline medium . The results show that addition of Au can significantly promote the catalytic activity and stability of Pt/C and Pd/C for glycerol electrooxidation. The catalysts with a weight ratio of 4:1 for Pt to Au and Pd to Au show the best performance for glycerol electrooxidation and the PtAu(wt 4:1)/C shows a better performance than the PdAu(wt 4:1)/C. Glycerol electrooxidation on the PdAu(wt 4:1)/C has a better stability than that on the Pt/C. The results show that the PdAu(wt 4:1)/C can give a better discharge performance than the Pt/C in a direct glycerol fuel cell. Electrooxidation of pre-adsorbed CO has been used to explain the results.
研究领域:
化学
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催化科学
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 63
·36353-36359
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IF 2.936
Cuiping Zhai,Shenshen Li,Jianhong Wang,Yong Liu
A simple method for the preparation of porous nitrogen-doped carbon spheres (MNCS) with honeycomb-like structures through the self-assembly of colloidal silica by using polyaniline as the nitrogen source and a carbon precursor is reported. The BET surface area calculated from N2 adsorption/desorption measurement of the MNCS is up to 882 m2 g−1. The synthesized MNCS were employed as a support for Pt nanoparticles for the oxidation of methanol and ethanol in alkaline media. Compared to Pt supported on commercial Vulcan XC-72R carbon (Pt/C), Pt/MNCS exhibit higher electro-catalytic performance and greater stability, indicating that MNCS have potential application prospects as electro-catalyst supports for alcohol oxidation in alkaline media. This enhancement in performance is due to the honeycomb-like porous structure of the MNCS and the doping with nitrogen.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
·
IF 2.93
Shan-Shan Li,Yuan-Yuan Hu,Jiu-Ju Feng,Zhang-Ying Lv,Jian-Rong Chen,Ai-Jun Wang
In this paper, a simple, fast, and green method is developed for preparation of uniform Pd nanodendrites anchored on reduced graphene oxide (Pd/RGO) at room temperature , with the assistance of octylphenoxypolye thoxyethanol (NP-40) as a soft template, while no seed, organic solvent , or special apparatus involved. The as-prepared nanocomposites show the improved CO tolerance, enhanced catalytic activity , and better stability for ethylene glycol (EG) and glycerol (Gly) electrooxidation in alkaline media , compared with commercial Pd black and Pd/C catalysts. The synthetic strategy can be extended to fabricate other electrocatalysts in direct alcohol fuel cells .
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiaomei Ning,Xiaosong Zhou,Jin Luo,Lin Ma,Xuyao Xu,Liang Zhan
The effects of catalyst support and synthesis process on the interaction between Pt nanoparticles (NPs) and S-doped carbon nanotubes (SCNTs), and the resultant electro-oxidation catalytic performance of glycerol, formic acid and CO were systematically researched. Pt NPs on SCNTs had better electro-oxidation catalytic performances than that of Pt NPs on CNTs. The doped S in thiophene-like structure (C-S-C) activated the neighboring C atoms to interact with Pt NPs, improving the catalytic performance with stronger ability to remove poisonous intermediates. The formed C-S-C had a synergistic effect with the neighboring Pt-C, promoting the adsorption and activation of reactants. The improved metal-support interaction resulted in Pt with smaller nanoparticle size and more exposed active sites. In different synthesis process, Pt NPs were more likely to interact with activated C neighboring S in ethylene glycol reduction method. However, defects containing doped S preferred to interact with Pt NPs in impregnation method. The research results indicated that rationally regulating the surface properties of carbon support and choosing an appropriate catalyst synthesis strategy to intensify the required metal-support interaction can greatly improve the catalytic performance.
研究领域:
材料科学
·
电化学催化
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Ning Zhang,Jing Wang,Wen Zhang,Yingxiu Zhao,Zemeng Dong,Zexing Wu,Guang-Rui Xu,Lei Wang
Despite considerable efforts to study direct alcohol fuel cells (DAFCs), the development of efficient bifunctional catalysts for monohydric alcohol and polyhydric alcohols remains a great challenge. This work reports the preparation of self-supported PdNi dendrites on Ni foam (self-supported PdNi DNTs/NF) with a large specific surface area by a simple self-sacrificing template and hydrothermal method. The presence of NF with enrichment of nucleation sites is crucial for the generation of self-supported PdNi DNTs. The as-obtained self-supported PdNi DNTs/NF exhibits an excellent property for ethanol and glycerol electrooxidation with the mass activity of 2375.7 mA mg cat −1 and 2451.6 mA mg cat −1 , the specific activity of 10.07 mA cm −2 and 10.84 mA cm −2 , respectively, in alkaline media, which should attribute to abundant high-index facets and low-coordinated atoms on the edge of branches. Furthermore, the PdNi DNTs/NF exhibits outstanding long-term durability in the current–time test for 7200 s with superior anti-CO poisoning performance, possessing a potential application in DAFCs.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
He Xiao,Wenxiang Wang,Man Zhao,Zimei Fu,Meng Bai,Li Zhang,Junming Zhang,Ergui Luo,Jian Zhang,Haishun Wu,Jianfeng Jia
Cut-lost, highly active and stable (photo-)electrocatalysts are earnestly expected to overcome high energy obstacles in methanol oxidation reaction (MOR). A hybrid of NiW/graphene (NiW/G) is prepared by a simple self-designed electrosynthesis method. During the process of electrosynthesis, exfoliation of bulky graphite into graphene and generation of multivalent NiW bimetal precursor are both achieved. This obtained composite displays superior photoelectrocatalytic performance towards MOR. As for NiW/G-light, its area activity (peak current) and mass activity (peak current) are up to 343.4 mA cm −2 and 5960.7 mA mg −1 respectively, much higher than NiW/G, Ni/G and W/G. Operando electrochemical impedance spectroscopy, in-situ Fourier transform infrared spectroscopy and other ex-situ techniques uncover that the excellent MOR performance for NiW/G-light results from synergetic modulation of nickel sites by introducing tungsten and light, which provides desired adsorption behavior and high electrochemical active surface area. It’s found that introduction of W component promotes the formation of W-O-Ni(Ni 3+ ) species, supporting more strong adsorption sites for methanol. This results in new reaction path between adsorbed methanol and OH* for producing formic acid. With application of light, the photo-generated hole promotes oxidation of residual Ni 2+ into Ni 3+ species, which provides additional formed NiOOH sites for MOR. It’s concluded introduction of tungsten and light is efficient for greatly enhancing methanol electrooxidation. This work is highly instructive for application of self-designed electrosynthesis method to construct dimetal/graphene composite and photoelectric synergistic catalysis towards MOR.
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
WATER RESEARCH
·
2019
·
IF 7.913
Dongni Sun,Xiaoting Hong,Keming Wu,K.S. Hui,Yingying Du,K.N. Hui
Electro-oxidation using RuO 2 –IrO 2 /Ti plate anode and electrocoagulation using iron plate anode were widely applied to remove ammonia and phosphate in an aquatic environment, respectively. In this work, we designed magnetically bound ZVI microparticles on RuO 2 –IrO 2 /Ti plate as a composite electrode for the simultaneous removal of ammonia and phosphate from aqueous solution via combined EO and EC (EO/EC) processes. We present a series of experiments to study such simultaneous removal under an electric field via the EO/EC process. In the electrochemical unit, mZVI-RuO 2 -IrO 2 /Ti, mZVI-graphite, and RuO 2 –IrO 2 /Ti electrodes were used as anodes. The influence of applied voltage, initial pH, zero-valent iron dosage, reaction temperature, and organic compounds on the EO/EC process was also examined. Ammonia and phosphate could be completely removed at an applied voltage of 10 V, pH of 7, zero-valent iron dosage of 0.1 g, and reaction temperature of 35 °C using mZVI-RuO 2 -IrO 2 /Ti anode when influent ammonia and phosphate concentrations is 200 and 100 mg L −1 . Ammonia degradation was consistent with pseudo-zero-order kinetic model. The characterization was analyzed by scanning electron microscope-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Hence, the mZVI-RuO 2 -IrO 2 /Ti electrode can be used for efficient simultaneous removal of ammonia and phosphate.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）