CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shukai Diao,Tianwen Wang,Wen Kuang,Su Yan,Xiaotian Zhang,Mingxuan Chen,Ying Liu,Aidong Tan,Tianrang Yang,Jianguo Liu
Alkaline water electrolysis (AWE) is a leading “green hydrogen” production technology. Industrial electrodes use alkaline leaching to remove Al from NiAl alloy, creating pores and increasing specific surface area (SSA) but still suffer from poor electrode performance. This study presents a method for fabricating an efficient bifunctional electrode. The process involves creating a porous Ni layer with high SSA on nickel mesh (NM) by reducing NiO, which facilitates the formation of Ni(OH) 2 nanosheets. The resulting Ni/Ni(OH) 2 @NM electrode features a hydrophilic, gas-repellent and highly electrochemically active surface. It achieves low overpotentials for hydrogen and oxygen evolution reactions (164 mV and 337 mV at 100 mA/cm 2 , respectively). The electrolyzer using Ni/Ni(OH) 2 @NM electrodes only requires 1.695 V to achieve 300 mA/cm 2 at 80 °C after a 2000 h durability test. The electrode also demonstrates excellent stability under frequent start-stop cycles, making it well-suited for integration with intermittent renewable energy sources.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Ain Shams Engineering Journal
·
2022
·
IF 4.79
Muhammad Zaheer,Haris Naeem Abbasi
Supercapacitors are getting a lot of attention as high-performance energy storage devices that can find applications in multiple fields including high-power military devices and wearable or portable electronics. For a better supercapacitor device electrode plays a vital role and graphene is being widely studied as an efficient material for electrodes due to its large specific surface area of 2630 m 2 /g. However, the disordered alignment and the severe aggregation hinder the maximum utilization of its surface area. In this work nickel nitrate and chloroform treatments were used to improve the deposition of graphene on the current collector and to improve the substrate surface quality, respectively. In addition, the stacking technique is used to improve the overall energy storage capability of the device. The electrophoretic deposition (EPD) coating method was used to deposit graphene on the current collector. The important optimization was also performed in a KOH-based 3-electrode system and the chloroform treated and graphene-coated electrode showed an improved capacitance of 151 F/g at scan rate 0.01 V/sec as compared to the 126 F/g of the untreated sample. The graphene-coated electrode showed good cyclic stability with capacitance fading of ∼4.4 × 10 −6 %/cycle and a higher operating voltage up to 6 V has been achieved by utilizing the stacking method.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Sun Jiaqi,Peng Yaru,Chen Zeng
Applications of the molten salt electrodeposition method have attracted researcher’s attention in the preparation of magnesium-based alloys in the past decades. Sometimes, hot corrosion occurs on the surface of a metal electrode in molten salt. Here, the corrosion of a Ni electrode and its effect on the electrochemical formation processes of Mg-Ni alloys were studied in LiCl-KCl-MgCl 2 molten salt under an Ar atmosphere. Immersion experiments and some electrochemical experiments, such as cyclic voltammetry (CV), open-circuit chronopotentiometry (OCP), and potentiostatic electrolysis, were carried out to investigate the performance of a Ni metal electrode in LiCl-KCl-MgCl 2 molten salt. Hot corrosion of the Ni electrode became serious with the addition of MgCl 2 , and MgO was deposited on the surface of the Ni sheet. The CV and OCP experiments showed that the water introduced from outside had serious effects on the electrochemical reaction processes in this experiment. Corrosion of the Ni substrate was dynamically and thermodynamically inhibited in the electrochemical formation processes of Mg-Ni alloys. However, there was a small amount of MgO in the Mg-Ni alloys, and corrosion of the Ni sheet showed obvious effects on the morphology of Mg-Ni alloys
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Shijie Wang,Shenghan Zhang,Zhenye Zhang,Yu Tan,Kexin Liang,Xinliang Guo,Xuhui Kong
Nitrogen heterocyclic organics are promising hydrogen storage carriers with the advantage of being capable of large-scale transportation over long distances using existing oil and gas facilities. However, traditional methods for the hydrogenation and dehydrogenation of organic hydrogen carriers usually require high temperature and pressure conditions and external hydrogen supplies, which hinder their large-scale applications, as well as having certain safety risks. In this paper, a reversible electrochemical hydrogen storage system using quinoxaline as a hydrogen carrier was developed with potential for use at room temperature and atmospheric pressure. Experiments revealed that the hydrogenation conversion of quinoxaline reached 95% within 120 min at −0.20 V vs. RHE, and the dehydrogenation conversion of 1,2,3,4-tetrahydroquinoxaline reached 100% within 30 min at 1.30 V vs. RHE. This means that the system achieved quick and efficient reversible hydrogen storage. The Pd/NF dual-function electrode prepared by spontaneous redox reaction still showed high catalytic activity after 8 cycles, indicating its good long-term stability. The proton donor in the electrochemical hydrogenation process of quinoxaline was water, which completely eliminates the safety risk from the use of external hydrogen. This work provides a simple and reliable strategy for efficient hydrogen storage using nitrogen heterocyclic organics.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2015
·
IF 4.847
Wenbin Zhang,Shungao Yin,Xiaogang Li,Guanlian Xu,Tao Xie
The effect of electrolyte alkali metal cations (Li + , Na + , or K + ) on the electro-oxidation of urea and benzyl alcohol on NiOOH catalyst has been investigated by means of cyclic voltammetry and chronoamperometry in the presence of an electrolyte containing LiOH, NaOH, or KOH. The catalytic activity toward the electro-oxidation of urea and benzyl alcohol was found to increase in the sequence Li + < Na + < K + . This activity's difference is partly caused by different surface blockage abilities by OH–M + (H 2 O) x (M: Li, Na, K) clusters, which is similar to many electrocatalytic reactions on Pt reported previously, additionally, incorporation of various cations to the catalyst may induce the activities difference as well.
研究领域:
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 1
·50-55
·
IF 1.158
Li Junjing,Wang Huan,Cui Yuqi,Luan Cong,Wang Liang,Zhang Zhaohui,Zhao Bin,Ma Chang,Zhang Hongwei,Cheng Xiuwen
Understanding the kinetics during electrochemical hydrodechlorination was of great importance to the design of treatment process. In this study, the six isomers of dichlorophenol were subjected to electrochemical hydrodechlorination using homemade palladium/polypyrrole/foam nickel electrode.
Under the conditions of dechlorination current is 5 mA, temperature is 25 °C, initial concentration of pollutants is 0.5 mmol L–1, electrochemical dechlorination time is 120 min, the dechlorination processes of 2,3-dichlorophenol (2,3-DCP), 2,4-dichlorophenol (2,4-DCP),
2,5-dichlorophenol (2,5-DCP), 2,6-dichlorophenol (2,6-DCP), 3,4-dichlorophenol (3,4-DCP) and 3,5-dichlorophenol (3,5-DCP) were compared. The degradation of dichlorophenol reaction followed pseudo-first-order kinetics. During the electrolysis process, the products of six DCP (dichlorophenol)
isomers dechlorination are mainly phenol, a small amount of monochlorophenol produced at the same time. The classification kinetics of six kinds of DCP (dichlorophenol) was studied according to the dechlorination path. Then the reaction rate constants of different reaction stages were obtained.
Besides, we speculated that the degradation rates of six DCP isomers were affected by pK
a
and molecular structure.
研究领域:
环境科学
·
电化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Junjing Li,Yu Wang,Bin Zhao,Jing Ding,Jun Zhang,Menghua Yin,Zhaohui Zhang,Shumin Ma,Yaqian Liu,Zilin Tan,Hongwei Zhang,Liang Wang,Dionysios D. Dionysiou
In this work, a nickel-cobalt bimetallic organic framework (NiCo-MOF) was introduced as an intermediate layer to synthesize a Pd/NiCo-MOF/Nickel foam composite electrode, which was applied for electrocatalytic hydrodechlorination (ECH) of chlorinated pharmaceuticals and personal care products (PPCPs). The introduction of the NiCo-MOF structure dramatically improved the catalytic activity compared with the common Pd/Nickel foam electrode. Combined with transmission electron microscope and X-ray absorption fine structure analysis, catalyst on Pd/NiCo-MOF/Nickel foam surface had smaller particle size. The removal of the Pd/NiCo-MOF/Nickel foam electrode for chloramphenicol (CAP) reached more than 95 % at 40 min, while the removal of the Pd/Nickel foam electrode was only approximately 55 %. In this study, the active atomic hydrogen (H*) adsorbed on the Pd and NiCo-MOF structures is the critical active species to remove chlorinated PPCPs by Pd/NiCo-MOF/Nickel foam electrode. Density functional theory (DFT) was used to calculate and investigate the adsorption strength of the composite electrode structure for CAP, the product and H*. This work provided a new method to achieve higher catalytic performance and reactivity operability and longevity of catalytic materials through the synergism of a NiCo-MOF interlayer with Pd particles.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xianda Sun,Yinshi Li,Ming-Jia Li
The low performance and low catalyst utilization of electrodes have been challenging issues for anion-exchange membrane direct liquid fuel cells (AEM DLFCs). Herein, a high-utilization and high-activity three-dimensional electrode that enables palladium nanoparticles to be directly dispersed on carbon-decorated porous nickel is reported by a facile and well-controlled fabricating method. The as-synthesized Pd@C–Ni electrode possesses an electrochemically active surface area as high as 121.8 m2 g–1, 1 order of magnitude higher than conventional Pd/C@CP electrode. The electro-oxidation of ethanol in Pd@C–Ni shows a low onset potential (0.3 V) and a high peak current density (0.16 A cm–2) in alkaline environment. When Pd@C–Ni acts as anode in an AEM direct ethanol fuel cell (DEFC), the peak power density up to 202 mW cm–2 is achieved at 60 °C, representing the best performance for oxygen-based AEM DEFCs reported in the open literature under the same operating temperature. Additionally, a stable 16 h discharge at 100 mA cm–2 demonstrates its good stability. This work presents an effective strategy for high-performance DLFCs.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Junjing Li,Shumin Ma,Ziyan Qi,Jing Ding,Menghua Yin,Bin Zhao,Zhaohui Zhang,Yu Wang,Hongwei Zhang,Liang Wang,Dionysios D. Dionysiou
To effectively improve the particle dispersion of the catalytic metal and catalytic activity of the palladium electrode, a new type of efficient Pd/NiFe-MOF/foam-Ni composite electrode was prepared. The results showed that the reaction rate constant of chloramphenicol (CAP) by Pd/NiFe-MOF/foam-Ni was three times that of Pd/foam-Ni. X-ray absorption fine structure (XAFS) results showed that palladium on Pd/NiFe-MOF/foam-Ni had a lower oxidation state than that on Pd/foam-Ni. The Pd nanoparticles were uniformly dispersed on the composite electrode and had a small particle size. The electrode had good resistance to sulfites and the electrocatalytic activity was hardly affected in the presence of Cl - , NO 3 - , HCO 3 - , CO 3 2- and Ca 2+ in wastewater. Besides, the introduction of nickel-iron bimetallic organic framework (NiFe-MOF) increased the electron density of Pd, improved the dispersion and electrochemical active surface area (ECSA) of Pd. The reaction pathway of CAP was proposed, and the ecotoxicity of CAP and its products was evaluated by the Ecological Structure Activity Relationships (ECOSAR) model. Combined experimental data and density functional theory (DFT) analysis enable us to propose the hydrodechlorination mechanism of CAP on the Pd/NiFe-MOF/foam-Ni electrode. The Pd/NiFe-MOF/foam-Ni composite electrode has good application prospects in the treatment of organic pollutants in wastewater and other environmental remediation applications.
研究领域:
环境科学
·
电化学
·
污染治理
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 13
·期 18
·17247-17254
·
IF 4.05
Wang Wei,Zhang Zhe,Wang Min
The electrochemical catalytic oxidation of 5-hydroxymethylfurfural (HMF) derived from biomass to produce 2,5-furandicarboxylic acid (FDCA) has attracted significant attention. Herein, the catalyst NiO-N/C composite was prepared and showed high activity for the electrochemical oxidation of HMF. The optimized NiO-N/C composite electrode supported by foamed nickel exhibits 99% conversion of HMF, 84% yield of FDCA, and 96% faradic efficiency. The NiO-N/C composite electrode is stable and remains active after six consecutive measurements. This work provides an effective method for the design and preparation of biomass energy electrocatalysts based on nitrogen-modulated NiO materials.
研究领域:
电化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 1
·119
·
IF 3.52
Yuyang Wei,Wenbin Zhang
Nickel electrodes under continuous potential cycling were applied for the electrooxidation of benzyl alcohol and glycine in KOH solutions, and their activities were measured and compared by cyclic voltammetry. It is shown that intrinsic activities of both reactions decrease with the increasing catalyst loadings, and a more significant decreasing trend was observed in glycine electrooxidation when compared to benzyl alcohol electrooxidation. These phenomena may be explained by an increasing of mass loading induced a decrease of the catalyst surface conductivity, structure changes of Ni(OH)2from α-phase to β-phase, and the intercalation of glycine molecules into nickel hydroxide interlayers.
研究领域:
电化学
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Liu Shengqin,Jin Yangxin,Huang Shuquan,Zhu Qi,Shao Shan,Lam Jason Chun-Ho
The catalytic valorisation of biomass to afford synthetically useful small molecules is essential for sustainable biorefinery processes. Herein, we present a mild cascaded electrochemical protocol for converting furoic acid, a common biomass-derived feedstock, into a versatile platform chemical, gamma-butyrolactone. In the platinum(+)|nickel(−) electrode paired undivided cell, furoic acid is electrochemically oxidised with 84.2% selectivity to 2(5 H )-furanone, the olefin of which is then hydrogenated to yield gamma-butyrolactone with 98.5% selectivity. The final gamma-butyrolactone yield is 69.1% with 38.3% Faradaic efficiency and 80.1% carbon balance when the reaction is performed with 100 mM furoic acid at 80 °C at +2.0 V Ag/AgCl . Mechanistic investigation revealed the critical temperature and electrolyte pH conditions that maximise the production and protection of the key intermediate, furan radical, promoting its transition to 2(5 H )-furanone rather than self-polymerising. The reaction is scalable, as 2.1 g of 98.1% pure gamma-butyrolactone is isolated through a simple solvent extraction.
研究领域:
化学工程
·
电化学
·
可持续化学
·
生物质转化
✓ 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）