JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ke Zhang,Menglin Shi,Yu Wu,Chuanyi Wang
The slow kinetics and high cost of noble metal catalysts greatly hinder the oxygen evolution reaction (OER) in the application of large-scale oxygen production, as well as water splitting. In order to overcome this burgeoning issue, worldwide research efforts have been carried out to find alternative, and efficient electrocatalysts . Due to its cheap and abundant sources, FeCo-based materials are considered as better candidate electrocatalysts for OER. Herein, a nanocomposite catalyst consisting of FeCoSe 2 nanoparticles and Co 0.85 Se nanosheets was synthesized via a one-pot hydrothermal method . The resultant FeCoSe 2 /Co 0.85 Se heterostructure catalysts can further used as a self-supported catalytic electrode to drive the OER, which exhibits the overpotential of 0.33 V at a current density of 10 mA cm −2 and Tafel slope of 50.8 mV dec −1 . Raman spectroscopy was employed to explore the intrinsic active species of as-prepared hybrid catalyst during the OER process, and test result shows that metal selenides was acting as the precursor of the real reaction species. This work provides a possibility to develop cheap and effective OER electrocatalysts to replace the costly noble metal catalysts for OER in electrochemical devices .
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
Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4893-4902
·
IF 6.177
Keting Feng,Tao Sun,Xiaoyun Hu,Jun Fan,Dongyuan Yang,Enzhou Liu
Photocatalytic H2 evolution is a promising way to obtain green H2 due to its clean and sustainable characteristics. Herein, a series of 0D/2D Co0.85Se/TiO2 heterojunctions were fabricated through a successive two-step hydrothermal strategy. Among them, 15%-Co0.85Se/TiO2 displays the most excellent H2 rate of 2312.5 μmol g−1 h−1, which is 10.3 times and 10.8 times higher than that of TiO2 and Co0.85Se, respectively. And the H2 production rate per electrochemically active surface area of 15%-Co0.85Se/TiO2 is 127.41, which is obviously more than that of TiO2 (14.17) and Co0.85Se (5.39). Based on the core-level alignment method and free radical capture tests, the enhanced activity mainly resulted from the higher electrochemically active surface area and the formation of a p–n heterostructure between TiO2 and Co0.85Se. This research provides a strategy for the development of noble metal-free nanocomposites for efficient photocatalytic H2 production.
研究领域:
材料科学
·
化学
·
能源科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5736-5744
·
IF 5.726
Weiyang Jin,Fang Liu,Xiaoliang Guo,Jun Zhang,Lekai Zheng,Yongchuan Hu,Jing Mao,Hui Liu,Yanming Xue,Chengchun Tang
The exploration of high-performance, cost-effective, and stable electrocatalysts for the oxygen evolution reaction (OER) is crucial for future energy storage and conversion technologies. Cobalt-based hydroxides and oxides have been considered as ideal OER electrocatalysts and have been intensively studied; however, their catalytic activity is still unsatisfactory. It is known that the interfacial electron and structure engineering of composite electrocatalysts often results in synergistically enhanced catalytic performance. Herein, a self-supported binary heterogeneous catalyst composed of CoFe LDH/Co0.85Se nanosheet arrays vertically grown on carbon cloth has been reported. The heterostructure electrocatalyst exhibits excellent activity for the OER in alkaline electrolyte, requiring an overpotential of only 241 mV at a current density of 10 mA cm−2 with a small Tafel slope of 48 mV dec−1. These performances are significantly better than those of the bare CoFe LDH and Co0.85Se catalysts. Moreover, the composite electrodes exhibit outstanding durability within 40 h of testing. Our further electrochemical results show that the excellent activities of the heterostructure electrodes should be ascribed to the interfacial coupling effect, increased number of activity sites, accelerated electron transfer, and strong structural stability. This work paves an interesting route for boosting the OER performance of oxide-based electrocatalysts by the regulation of electronic structure through introducing non oxide electrocatalysts for various applications.
研究领域:
材料科学
·
电化学
·
能源转换
·
纳米材料
·
催化化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 14
·145701
·
IF 3.573
Yong Zuo,Ji-Ming Song,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
P-nitrophenol (4-NP) and hydrazine hydrate are considered to be highly toxic pollutants in wastewater, and it is of great importance to remove them. Herein, TiO2-loaded Co0.85Se thin films with heterostructure were successfully synthesized by a hydrothermal route. The as-synthesized samples were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy and selective-area electron diffraction. The results demonstrate that TiO2 nanoparticles with a size of about 10 nm are easily loaded on the surface of graphene-like Co0.85Se nanofilms, and the NH3 · H2O plays an important role in the generation and crystallization of TiO2 nanoparticles. Brunauer–Emmett–Teller measurement shows that the obtained nanocomposites have a larger specific surface area (199.3 m2 g−1) than that of Co0.85Se nanofilms (55.17 m2 g−1) and TiO2 nanoparticles (19.49 m2 g−1). The catalytic tests indicate Co0.85Se–TiO2 nanofilms have the highest activity for 4-NP reduction and hydrazine hydrate decomposition within 10 min and 8 min, respectively, compared with the corresponding precursor Co0.85Se nanofilms and TiO2 nanoparticles. The enhanced catalytic performance can be attributed to the larger specific surface area and higher rate of interfacial charge transfer in the heterojunction than that of the single components. In addition, recycling tests show that the as-synthesized sample presents stable conversion efficiency for 4-NP reduction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2018
·
IF 4.432
Yan Ma,Xianwen Wang,Huajian Chen,Zhaohua Miao,Gang He,Junhong Zhou,Zhengbao Zha
To surmount the challenges of limited drug penetration and therapeutic resistance in solid tumors, stimuli-responsive nanocarrier-based drug delivery systems (DDSs) with relatively small sizes are inherently favorable for combined treatment of cancerous cells. In this work, poly(acrylic acid) (PAA) functionalized Co0.85Se nanoparticles (PAA-Co0.85Se NPs) were synthesized through an ambient aqueous precipitating approach for synergistic photothermal-chemo treatment of cancer. The obtained PAA-Co0.85Se NPs possess ultrasmall size (8.2 ± 2.6 nm), considerable near-infrared (NIR) light absorption, high photothermal transforming efficiency (45.2%) and low cytotoxicity, all of which are beneficial for localized photothermal ablation of cancer cells. Doxorubicin hydrochloride (DOX·HCl) was then successfully loaded on PAA-Co0.85Se NPs with a loading capacity up to 8.3% to form PAA-Co0.85Se-DOX composites, which exhibited an exciting acidic pH-responsive drug release property due to the protonation of amino groups in DOX and carboxyl groups in PAA molecules. As expected, when HeLa cells were treated with PAA-Co0.85Se-DOX NPs as well as NIR laser irradiation, a significant synergistic cell-killing effect was observed, greatly improving the treatment efficiency. Thus, this work presents novel insight into the design of ultrasmall stimuli-responsive nanocarrier-based DDSs for synergistic photothermal-chemo treatment of cancer cells.
研究领域:
肿瘤学
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纳米医学
·
生物材料
·
药物递送
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光热治疗
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化学生物学
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转化医学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2020
·
IF 6.146
Xiaohui Sun,Nuzahat Habibul,Hong Du
ABSTRACT Co 0.85 Se magnetic nanoparticles supported on carbon nanotubes were prepared by a one-step hydrothermal method. The saturation magnetization and coercivity of the MWCNTs/Co 0.85 Se nanocomposites increased due to a decrease in the Co 0.85 Se nanoparticle size in the MWCNTs/Co 0.85 Se nanocomposites and an increase in the distance between the Co 0.85 Se nanoparticles, which increased the specific surface area, thereby benefiting the electrocatalytic performance of the catalyst. Moreover, the MWCNTs/Co 0.85 Se nanocomposites exhibited an excellent hydrogen evolution reaction performance owing to the presence of MWCNTs, which enhanced the mass transport during the electrocatalytic reactions. Furthermore, in an acid solution, the 30 wt% MWCNTs/Co 0.85 Se composite catalyst exhibited a current density of 10 mA cm −2 at a small overpotential of 266 mV vs. RHE, a small Tafel slope of 60.5 mV dec -1 , and good stability for HER.
研究领域:
材料科学
·
电化学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Xiyu Zhao,Xinlu Li,Yujie Zhao,Zelong Su,Yanyan zhang,Ronghua Wang
Two-dimensional tremelliform Co 0.85 Se nanosheets were synthesized by a simple solvothermal method using ethylenediamine (EN) to control the morphology. EN acts as a strong alkalinity supplier, facilitating the formation of Co 0.85 Se nanosheets or nanospheres in the final product. To further explore the electrochemical application of tremelliform Co 0.85 Se nanosheets, an asymmetric supercapacitor (ASC) was fabricated in which tremelliform Co 0.85 Se nanosheets were used as the positive electrode and commercial activated carbon (AC) was used as the negative electrode. Co 0.85 Se//AC ASC demonstrated impressive electrochemical performances, providing an energy density of 17.8 W h kg −1 at a high power density of 3.57 kW kg −1 and a capacitance retention of 93% after 2000 charge–discharge cycles.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 1
·
IF 2.504
Guofu Ma,Fengting Hua,Kanjun Sun,Enke Fenga,Hui Peng,Zhiguo Zhang,Ziqiang Lei
The electrochemical performance of an energy conversion and storage device like the supercapacitor mainly depends on the microstructure and morphology of the electrodes. In this paper, to improve the capacitance performance of the supercapacitor, the all-pseudocapacitive electrodes of lamella-like Bi18SeO29/BiSe as the negative electrode and flower-like Co0.85Se nanosheets as the positive electrode are synthesized by using a facile low-temperature one-step hydrothermal method. The microstructures and morphology of the electrode materials are carefully characterized, and the capacitance performances are also tested. The Bi18SeO29/BiSe and Co0.85Se have high specific capacitance (471.3 F g–1 and 255 F g–1 at 0.5 A g–1), high conductivity, outstanding cycling stability, as well as good rate capability. The assembled asymmetric supercapacitor completely based on the pseudocapacitive electrodes exhibits outstanding cycling stability (about 93% capacitance retention after 5000 cycles). Moreover, the devices exhibit high energy density of 24.2 Wh kg–1 at a power density of 871.2 W kg–1 in the voltage window of 0–1.6 V with 2 M KOH solution.
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
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6287-6293
·
IF 3.3
Jin Li,Yu Zhang,Wenjie Wei,Gaochao Fan,Zumin Wang,Lingbo Zong,Lei Wang
Development of efficient non-precious and abundant electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is one of the key tasks in renewable energy technologies. Transition-metal selenides have been widely studied as promising candidates. Herein, a layer-structured CoSe2 was used as a precursor, followed by simple one-step dopamine coating. The as-prepared Co0.85Se@NC showed outstanding performance in both ORR and OER catalysis. The onset potential and half-wave potential of the ORR in 0.1 M KOH solution can reach 0.96 V and 0.85 V, respectively. The OER overpotential corresponding to 10 mA cm−2 in 1.0 M KOH solution is only 350 mV, which is much smaller than that of RuO2 (390 mV). Importantly, the catalyst showed good stability, demonstrating that the layered Co0.85Se@NC has great potential for advanced bifunctional electrocatalysis.
研究领域:
材料科学
·
可再生能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Zhenyun Zhao,Jie Yang,Jingwen Lin,Xu Wang,Dongliang Chen,Lei Jiao,Qinghua Zhang,Yang Hou,Zhizhen Ye,Jianguo Lu
Transition metal selenides have attracted particular interest in the energy storage field due to their high conductivity, but their low specific capacitances limit their development. Herein, we design the Co 0.85 Se with an orderly aligned nanowire-arrayed (NWA) structure, which has great micromorphological stability and fast electronic/ionic transport rate, achieving a high specific capacitance of 1800 F g −1 at 1 mV s −1 . The asymmetric supercapacitors (ASCs) are built to widen the voltage window to 0– 1.6 V and then increase the energy density , which reaches 71.3 Wh kg −1 at a power density of 800 W kg −1 in the liquid-state electrolyte, and 3.03 mWh cm −3 at the power density of 8.0 W cm −3 in the solid-state electrolyte. It also shows excellent cycling stability of 86 % retention after 10,000 charge/discharge cycles, fast rate capability of 79 % retention at the 15-fold increased current density and little performance degradation even under severe bent deformation. As shown, the Co 0.85 Se NWAs-based ASCs own high energy and power densities, long cycle life, fast rate capability and stable flexibilities simultaneously, which have significant potential in high-performance wearable energy storage systems .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Chao Gong,Miaoliang Huang,Pei Zhou,Zhixian Sun,Leqing Fan,Jianming Lin,Jihuai Wu
Mesoporous Co 0.85 Se nanosheets on Ni foam for high-performance supercapacitors were prepared by a facile one-step hydrothermal method. The as-synthesized Co 0.85 Se electrodes possess high pseudocapacitive performance with large specific capacitance and excellent cycling stability. The specific capacitance can achieve a maximum of 1378 F g −1 at a current density of 1 A g −1 , which can still keep 95.5% of capacitance retention after 1000 cycles. Then, an asymmetric supercapacitor was fabricated by using Co 0.85 Se nanosheets as positive material and activated carbon (AC) as negative material. The asymmetric configuration can extend voltage window to 1.6 V, which lead to a significant increase in the energy density to 39.7 W h kg −1 at a power density of 789.6 W kg −1 , couples with outstanding cycle stability. The results demonstrate that the mesoporous Co 0.85 Se nanosheets are promising electrode materials for supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiang Zhang,Jun Zhou,Yuying Zheng,Dongyang Chen
Coordination compound derivates (CCDs) have been widely applied in lithium-ion batteries (LIBs). However, the functionalization of CCDs with open structure and heteroatomic doping is still challenging. Herein, an effective functionalization strategy is presented to prepare a kind of CCD, where Co0.85Se nanoparticles are encapsulated by nitrogen-enriched hierarchically porous carbon (CS/NPC) based on the heat treatment of a cobalt-complexed hexamethylolmelamine-polyvinylpyrrolidone resin (Co2+/HPR). The abundant free volume and enriched N species of the HPR are responsible for the hierarchically porous configuration and high N-doping of the composites. By controlling the content of cobalt salt and the heating rate, high specific surface area (440.7 m2 g–1), high N-doping (8.54 atom %), and suitable mass loading of Co0.85Se (55.5%) were simultaneously achieved in CS-2/NPC-5, which delivers high reversible capacity (758.5 mAh g–1 at 0.1 A g–1), outstanding rate capability (401.7 mAh g–1 at 5 A g–1), and excellent cycling durability (638.4 mAh g–1 at 1 A g–1 after 200 cycles), suggesting a promising candidate for LIB anode materials.
研究领域:
材料科学
·
能源存储
✓ 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）