SEPARATION AND PURIFICATION TECHNOLOGY
·
2014
·
IF 3.065
Ji-Ming Song,Cheng-Cheng Liu,Song-Song Zhang,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
Adsorption is an effective method of removing contaminants from water, however, desorption often becomes more difficult after adsorption process, due to the strong binding force between the adsorbent and pollutants, so that the desorbent cannot be reused. In this paper, Co 0.85 Se nanosheets prepared through a hydrothermal reaction have been used to remove cationic dye methylene blue from aqueous solution in the presence of sodium borohydride. The results show that adsorption/desorption properties of the Co 0.85 Se nanosheets to MB can be greatly changed in the presence/absence of sodium borohydride (NaBH 4 ), and the equilibration time of the adsorption/desorption depends on the amount of NaBH 4 . When NaBH 4 or Co 0.85 Se nanosheets existed together, the residual quantity of MB in solution was less than one-twentieth of that in the system alone using either NaBH 4 or Co 0.85 Se nanosheets; while a large number of MB (ca.90%) was released once again into the solution after NaBH 4 was decomposed because of catalysis of Co 0.85 Se. The zeta potential and pH tests have been elucidated the mechanism for the adsorption of MB onto Co 0.85 Se nanosheets. The efficient adsorption and recovery of dyes indicate that the prepared Co 0.85 Se nanosheets have potential application in wastewater treatment under the assistance of NaBH 4 .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Electrocatalysis
·
2023
·Vol. 14
·期 5
·776-787
·
IF 3.1
Zheng Yingping,Yu Dehua,Zhang Ke,Xu Wei,Ma Kaili,Wang Yuhang,Lou Yongbing
As a representative anodic reaction, the oxygen evolution reaction (OER) is often combined with hydrogen evolution, carbon dioxide reduction, and other cathodic reactions. Bimetallic selenides can satisfy the requirement of efficiency and economy for OER. However, the OER performance of Fe-Co-Se is less than satisfactory, restricted by the limited inherent active sites. Therefore, by doping P into Fe-Co-Se, the electron density and mass transfer were successfully adjusted. The 3D dandelion-like flower Fe-Co-Se-P/CC showed η 10 of 210 mV and the 45.3 mV dec −1 Tafel slope better than Fe-Co-Se/CC and RuO 2 . Experimental investigations demonstrated that outstanding OER activity was ascribed to the double modulation influences of P dopant both in electron environment and morphology which could not only improve conductivity but also enrich catalytic reactive sites. This work presents another choice for the design of a transition metal OER catalyzer and propels the development of electrocatalytic oxygen production to higher efficiency and lower cost. Graphical Abstract 3D dandelion-like flowers Fe - Co-Se-P structure anchored on carbon cloth has been firstly synthesized as economy and efficient OER electrocatalyst, which displays outstanding catalytic perform ance (equipped with 210 mV low overpotential at η 10 ) and stability benefited from the double modulation effect of P doping on the electronic environment and morphology.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yunhua Zheng,Huiting Hu,Long Qian,Yao Zhu,Tao Zhang,Dongya Yang,Fengxian Qiu
The etching effect has the capability to control atom doping and trigger phase transformation, thereby enhancing the electrocatalytic reaction. Herein, iron-doped cobalt selenide (Fe-CoSe2) nanoparticle-decorated carbon nanofibers (Fe-CoSe2/CNFs) are synthesized by assembling an FeCo-Prussian blue analogue (FeCo-PBA) cube precursor with polyacrylonitrile fibers and then treating with hydrochloric acid, followed by gas phase selenization. The Fe-CoSe2/CNFs catalyst exhibits a large surface area and a porous structure, facilitating the permeation of electrolytes. Moreover, orthorhombic CoSe2 is obtained, which is in favor of improving the oxygen evolution reaction (OER). By modulating the etching time, the ideal crystal phase and the optimal amount of the dopant (Fe) can be achieved, thus showing favorable OER activity. Specifically, the Fe-CoSe2/CNFs electrocatalyst enables high electrocatalytic activity for the OER with a low overpotential of 263 mV to drive a current density of 10 mA cm–2 in 1 M KOH. A small Tafel slope of 51 mV dec–1 shows fast charge transfer kinetics. Density functional theory (DFT) calculations reveal that Fe-doped orthorhombic CoSe2(111) can modulate the electron structure, contributing to OH– adsorption ability. Given this, a strategy for phase transformation induced by etching technology is proposed to improve the intrinsic activity of the catalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2020
·Vol. 13
·期 11
·2950-2957
·
IF 8.183
Qin Rong,Hou Jiagang,Xu Caixia,Yang Hongxiao,Zhou Qiuxia,Chen Zizhong,Liu Hong
Electrocatalytic water splitting via hydrogen evolution reaction (HER) represents one of promising strategies to gain hydrogen energy. In current work, self-supporting Co 0.85 Se nanosheets network anchored on Co plate (Co 0.85 Se NSs@Co) is fabricated by employing easily tailorable Co metal plate as the source conductive substrate. The scalable dealloying and hydrothermal selenization strategy was employed to build one layer of three dimensional interlinking Co 0.85 Se nanosheets network on the surface of Co plate. Benefiting from bulky integrated architecture and rich active sites, the as-made Co 0.85 Se NSs@Co exhibits superior electrocatalytic activity and long-term catalytic durability toward HER. It only requires lower overpotentials of 121 and 162 mV to drive the current density of 10 mA·cm −2 for hydrogen evolution in 0.5 M H 2 SO 4 and 1 M KOH solution. Especially, no evident activity decay occurs upon 1,500 cycles or continuous test for 20 h at 10 mA·cm −2 in both acidic and alkaline electrolytes. With the merits of exceptional performances, scalable production, and low cost, the self-supporting Co 0.85 Se NSs@Co holds prospective application potential as stable and binder-free electrocatalysts for hydrogen generation in a wide range of electrolyte.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Shuxin Zhou,Huailin Fan,Fei He,Zhaobing Fu,Guoming Gao,Shu Zhang,Xun Hu
Metal selenides are necessary electrode materials in electrochemical energy storage , demonstrating comparable or even superior electrochemical performance to metal oxides . However, the role of Se of metal selenide on the pseudocapacitance is still opaque. Therefore, NiO/NiCo 2 O 4 /CoO and NiCoSe 2 spheres are contrastively synthesized and evaluated in an electrochemical system. The specific capacitance of the NiCoSe 2 electrode is 685 F·g −1 (411C·g −1 , 114.2 mAh·g −1 ) at 1 A·g −1 , which is 5.27 times as much as that of the NiO/NiCo 2 O 4 /CoO electrode (130 F·g −1 , 78 C·g −1 , 21.7 mAh·g −1 ). During charging-discharging for metal selenides electrodes, the new species of CoOOH and NiOOH appear, and the selenium in the NiCoSe 2 sphere disappears, indicating that the hydroxides but not the selenide participate in the electrochemical pseudocapacitance. Selenium does not participate in pseudo-capacitance reactions and promotes the transformation of the active phase. In addition, excellent electrical conductivity of selenium increase the electrochemical performance. The asymmetric device with NiCoSe 2 as a positive electrode shows a superior energy density of 24 Wh·kg −1 at 800 W·kg −1 and outstanding stability (146% retention after 5000 cycles). Notably, two asymmetric devices in series can be charged to 3.21 V by a solar-panels, which can successfully drive different loads, indicating the outstanding performance of the devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 12
·6626-6636
·
IF 2.047
Huang Jiajie,Li Xiaoyue,Jiang Shiqi,Liu Cheng,Lu Mixue,Yang Yefeng
Cobalt diselenide (CoSe 2 ) has stimulated increasing research interest in the field of sodium-ion batteries (SIBs) because of its relatively high theoretical capacity and affordable cost. Nevertheless, its sodium storage performance and practical application are largely hampered by inferior electrical conductivity, severe volumetric variation, and pulverization during the repeated cycling process. In this work, we report the fabrication of hybrid spheres of Fe-doped CoSe 2 embedded in a carbon shell (denoted as Fe-CoSe 2 /C), which uses a facile solvothermal and subsequent carbonization/selenization approach. The carbon shell produced from the precursor of CoFe-glycerate (CoFe-Gly) effectively enhances the electrical conductivity and mitigates the structural stress, while the modulated doping of certain amounts of Fe in CoSe 2 facilitates the transfer of electrons and the diffusion of ions in the composite. As a result, the optimal Fe-CoSe 2 /C-2 electrode exhibits good rate performance (388 mAh g −1 at 5 A g −1 ) and outstanding cycling durability (501 mAh g −1 at 1 A g −1 after 500 cycles, retention of 93.5%), suggesting the great potential of Fe-CoSe 2 /C hybrid spheres to serve as promising anode materials for high-performance SIBs. Graphical Abstract
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xiang Li,Miaomiao Chen,Rong Rui,Zhigui Wan,Feng Chen,Xiaoshuang Zuo,Chang Wang,Hai Wu
Foliate cobalt selenide (Co0.85Se) was synthesized by the hydrothermal method and was combined with trace platinum (Pt) to form a Pt/Co0.85Se material, which was modified on the surface of a glassy carbon electrode (GCE) to fabricate a novel nonenzymatic electrochemical sensor (Pt/Co0.85Se/GCE) for the selective determination of dopamine (DA). On the Pt/Co0.85Se interface, well-separated oxidation peaks of DA, ascorbic acid (AA), and uric acid (UA) were observed due to the superior conductivity of Co0.85Se and the excellent catalytic activity of Pt. With the synergistic effect of Pt and Co0.85Se, the linear range for DA detection was found to be 0.50-22.0 pM with a detection limit of 0.39 pM (S/N=3) and a high sensitivity of 2306 pA mM -1 cm -2 . Furthermore, the proposed sensor exhibited high selectivity for the determination of DA in the presence of UA, AA, and other potential interferences, which indicated that the sensor showed great potential for practical and reliable DA analysis of serum samples.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 8
·期 8
·1531-1536
·
IF 4.59
Zhaowei Ren,Zhenxin Zhao,Kun Zhang,Xiaomin Wang,Yongzhen Wang
Graphical Read my LiPSs : A CoSe 2 /CC composite interlayer structure limiting liquid lithium polysulfides (LiPSs) is prepared to address the problem of polysulfides susceptibility to dissolution in lithium−sulfur batteries, which accelerates the reduction of soluble LiPSs and the reuse of insoluble product Li 2 S. The electrochemical results confirm that CoSe 2 /CC achieves high capacity and good cycling stability as an interlayer, and maintains high Coulombic efficiency under high loading and low current conditions, indicating that the shuttle of LiPSs is effectively suppressed. Lithium−sulfur batteries have been regarded as the next generation of competitive batteries because of their high theoretical capacity and energy density. However, the commercial development of lithium−sulfur batteries is restricted by the shuttle action of polysulfides and volumetric expansion of sulfur. Herein, we developed cobalt selenide/carbon cloth composites (CoSe 2 /CC) as the interlayer. CoSe 2 can not only limit the shuttling of polysulfides by Co−S bonds and accelerate the catalytic conversion kinetics of sulfur chemistry, but also increases the electrical conductivity of materials, leading to an excellent cycle stability. As a result, the cell with CoSe 2 /CC interlayer has a high initial capacity of 1420 mAh g −1 at 0.1 C and keeps high-capacity retention of 596 mAh g −1 after 500 cycles at 1 C rate (70 %). Subsequent electrochemical tests show that CoSe 2 /CC enhance the electrochemical behavior of the polysulfides. Therefore, the hierarchical CoSe 2 /CC composites have promising application potential in lithium−sulfur batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xusheng Dong,Ruizheng Zhao,Bin Sun,Tengsheng Zhang,Boya Wang,Yanyan He,Tingting Gao,Dongliang Chao,Guowei Zhou
Transition metal selenides are regarded as potential sodium storage materials for their high theoretical capacity and superior electrical conductivity. However, unsatisfied cycle stability and rate capability, which is caused by its intrinsic structural instability and sluggish conversion reaction, greatly hinder the application. Herein, in-situ electrostatic attraction and selenization process are used to construct Ni 0.5 Co 0.5 Se 2 /Ti 3 C 2 T x composite, in which the homogeneous Ni 0.5 Co 0.5 Se 2 nanoparticles are anchored in the Ti 3 C 2 T x MXene architecture. Based on the unique confinement effect and strong chemical interface coupling, the volume expansion and aggregation of the Ni 0.5 Co 0.5 Se 2 /Ti 3 C 2 T x anode during the cycling process are effectively prevented. Furthermore, the evenly Ni 0.5 Co 0.5 Se 2 bimetallic selenides nanoparticles endow rapid charge transfer and redox kinetics due to shortened Na + diffusion distance and more accessible active sites. As a result, the as-prepared Ni 0.5 Co 0.5 Se 2 /Ti 3 C 2 T x anode exhibits long cycle stability over 1000 cycles at 2.0 A g −1 , pushing forward the construction of advanced conversion-type anode for high-performance sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 8
·4446-4454
·
IF 4.036
Hongfeng Ye,Xuejiao Zhou,Zhitao Shao,Jing Yao,Wenjie Ma,Lili Wu,Xinzhi Ma
Cobalt diselenide (CoSe2) is considered to be a promising economical and efficient electrocatalyst for the hydrogen evolution reaction (HER). Here carbon nanotubes (CNTs) were employed as a conductive skeleton to optimize the electrocatalytic performance of CoSe2 through a simple one-step hydrothermal method. Beyond the expected, the introduction of CNTs not only accelerates electron transportation and ion diffusion, but also improves the reaction kinetics for HER by forming a CoSe2/CNT heterointerface. Consequently, the CoSe2/CNTs composite exhibits an optimal overpotential of 153 mV with a weight ratio of 10 : 1, and sustains a long period of 48 hours with an negligible overpotential deterioration. In addition, a Faraday efficiency of 97.67% is achieved with a H2/O2 molar ratio of 2 : 1. Therefore, these results open up further opportunities for yielding efficient and durable hydrogen evolving electrocatalysts from low-cost transition metal compounds.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Ruopeng Li,Qingyang Li,Lihui Xiao,Xinxin Bai,Shanshan Ji,Jinqiu Zhang,Maozhong An,Peixia Yang
Zinc–air batteries are regarded as ideal candidates for next-generation energy conversion and storage devices, but their conversion efficiency is mainly limited by the sluggish kinetics of the oxygen evolution reaction (OER). Therefore, development of highly active and durable non-noble-metal OER catalysts is of great significance to promote their industrialization process. Herein, we electrodeposit amorphous CoSe 2 ultrathin nanosheet arrays which exhibit a low overpotential of ∼0.287 V at 10 mA/cm 2 and a Tafel slope of ∼62 mV/dec toward the OER in 1 M KOH. This catalytic activity is superior to their crystalline counterpart, commercial RuO 2 , and most of the reported Co-based catalysts. It can be mainly attributed to the lowered adsorption free energy of OER intermediates and improved charge transfer ability with a phase transformation from the crystalline state to the amorphous state, besides the intrinsic catalytic activity of CoSe 2 . When serving as an air cathode in a zinc–air battery, the amorphous CoSe 2 also realizes a larger power density and a better long-term cyclability compared with those of crystalline CoSe 2 and Pt/C–RuO 2 electrodes. This work offers a new underpotential deposition strategy to fabricate high-activity amorphous catalysts and demonstrates its great potential for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2024
·Vol. 14
·期 9
·2302532
·
IF 24.4
Pan Luo,Honglei Wang,Xue Wen,Xianzhu Luo,Peng Xu
The electrocatalytic preparation of hydrogen at different pH values not only achieves excellent device performance but also promotes the application of reactive oxygen species (ROS) clearance and hydrogen anti-inflammation. However, it is difficult to develop materials that simultaneously achieve these excellent properties. Herein, the preparation of beaded necklace-like Co 9 Se 8 microspheres using a general and facile synthetic strategy is reported. The Co 9 Se 8 -modified electrode has three applications: efficient water splitting for enhanced performance, ROS scavenging, and hydrogen anti-inflammatory activity. Experiments, high-angle-annular-dark-field scanning transmission electron microscopy, and density functional theory calculations indicate that the reconstructed Co(OH) 2 plays a vital role in the oxygen evolution reaction and that the transition from *O to *OOH is the actual rate-determining step. The Co 9 Se 8 material, with its unique beaded necklace-like structure, exhibits exceptional hydrogen production capabilities in phosphate buffer solution (pH 7.4). In particular, hydrogen produce under neutral conditions can effectively reduce ROS levels and significantly inhibit inflammation-related pathological processes, playing a unique antioxidant and anti-inflammatory role at the cellular level. The obtained results indicate that the as-synthesized Co 9 Se 8 is more suitable for water splitting, ROS scavenging, and hydrogen anti-inflammatory applications, outperforming other transition metal electrodes and rendering practical industrial and clinical applications.
研究领域:
材料科学
·
生物医学工程
·
催化化学
✓ 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）