Chemistry-An Asian Journal
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2018
·Vol. 13
·期 18
·2700-2707
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IF 3.692
Chenyun Zhang,Bingwei Xin,Shengfu Duan,Anning Jiang,Baohua Zhang,Zhonghao Li,Jingcheng Hao
Graphical From rods to sheets : Controllable 1D/2D Co 3 O 4 and CoSe 2 nanostructures are synthesized through the same procedures for different reaction times (see figure) as efficient electrocatalysts for the oxygen evolution reaction (OER). Accordingly, insights into the morphology/microstructure–performance relationship of both Co 3 O 4 and CoSe 2 in the OER are obtained. The relationship between controllable morphology and electrocatalytic activity of Co 3 O 4 and CoSe 2 for the oxygen evolution reaction (OER) was explored in alkaline medium. Based on the time-dependent growth process of cobalt precursors, 1D Co 3 O 4 nanorods and 2D Co 3 O 4 nanosheets were successfully synthesized through a facile hydrothermal process at 180 °C under different reaction times, followed by calcination at 300 °C for 2 h. Subsequently, 1D and 2D CoSe 2 nanostructures were derived by selenization of Co 3 O 4 , which achieved the controllable synthesis of CoSe 2 without templating agents. By comparing the electrocatalytic behavior of these cobalt-based catalysts in 1 m KOH electrolyte toward the OER, both 2D Co 3 O 4 and 2D CoSe 2 nanocrystals have lower overpotentials and better electrocatalytic stability than that of 1D nanostructures. The 2D CoSe 2 nanosheets require overpotentials of 372 mV to reach a current density of 50 mA cm −2 with a small Tafel slope of 74 mV dec −1 . A systematic contrast of the electrocatalytic performances for the OER increase in the order: 1D Co 3 O 4 <2D Co 3 O 4 <1D CoSe 2 <2D CoSe 2 . This work provides fundamental insights into the morphology–performance relationships of both Co 3 O 4 and CoSe 2 , which were synthesized through the same approach, providing a solid guide for designing OER catalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2024
·
IF 4.3
Shuo Chen,Kaiqin Yue,Jiawei Shi,Zhicheng Zheng,Yuanqing He,Hao Wan,Gen Chen,Ning Zhang,Xiaohe Liu,Renzhi Ma
Most nonoxide catalysts based on transition metal elements will inevitably change their primitive phases under anodic oxidation conditions in alkaline media. Establishing a relationship between the bulk phase and surface evolution is imperative to reveal the intrinsic catalytic active sites. In this work, it is demonstrated that the introduction of Fe facilitates the phase transition of orthorhombic CoSe2 into its cubic counterpart and then accelerates the Co–Fe hydroxide layer generation on the surface during electrocatalytic oxygen evolution reaction (OER). As a result, the Fe-doped cubic CoSe2 catalyst exhibits a significantly enhanced activity with a considerable overpotential decrease of 79.9 and 66.9 mV to deliver 10 mA·cm–2 accompanied by a Tafel slope of 48.0 mV·dec–1 toward OER when compared to orthorhombic CoSe2 and Fe-doped orthorhombic CoSe2, respectively. Density functional theory (DFT) calculations reveal that the introduction of Fe on the surface hydroxide layers will tune electron density around Co atoms and raise the d-band center. These findings will provide deep insights into the surface reconstitution of the OER electrocatalysts based on transition metal elements.
研究领域:
材料科学
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电催化
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理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 17
·14977-14985
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IF 2.22
Luo Wenjie,Wang Jie,Zhang Zhen,Lu Donglin,Yu Yang,Ji Yuan,Qiao Hui,Qi Xiang,Liu Yundan
The development of effective but earth-abundant electrocatalysts for hydrogen evolution is still a great challenge. Non-noble metal-based multi-phase nanocomposites are regarded as emerging catalysts for efficient catalysts, but their practical application is still hindered by the lack of both satisfying activity and cost-effective synthesis. In this work, ternary CoSe 2 /MoO 2 /MoSe 2 nanocomposites with controllable phases have been successfully synthesized by simply direct selenization of cobalt molybdate (CoMoO 4 ) nanorods. Compared with related pure Mo-based and Co-based counterparts, the electric conductivity and the active sites of the as-prepared ternary nanocomposites have been both increased due to the synergistic effects. The as-prepared ternary CoSe 2 /MoO 2 /MoSe 2 nanocomposites electrocatalysts demonstrated superior HER performance which only requiring an overpotential of 229 mV for reaching 10 mA/cm 2 current density in acidic media.
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
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaowei Pan,Wenjun He,Da Cao,Ying Li,Caichi Liu,Limin Liang,Qiuyan Hao,Hui Liu
The development of highly efficient nonnoble metals toward hydrogen evolution reaction (HER) electrocatalysts is significant for producing hydrogen via water electrolysis. Selenides are becoming increasingly attractive owing to their excellent HER activity. Herein, CoSe2 nanorods were successfully manufactured on a carbon cloth (CC) and selenium vacancies were obtained using a plasma cleaner (CoSe2-VSe/CC) to enhance their intrinsic catalytic activity. The synthetic catalyst exhibited a lower overpotential of 88 mV at 10 mA cm–2 in 1 M KOH and high durability over 100 h at 100 mA cm–2, which can be ascribed to the increased electrochemical surface area and rapid electron transfer. In addition, density functional theory (DFT) calculations showed that introducing Se vacancies optimized the hydrogen adsorption energy on the Se site and reduced the transition-state energy barrier of water dissociation. This study laid a firm foundation for preparing high-performance and stable electrocatalysts via anion defect engineering.
研究领域:
材料科学
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电化学
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理论计算
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Yuqiao Wang,Chuanyong Jian,Xu He,Wei Liu
The development of a highly efficient hybrid catalyst is desirable for the water splitting to produce hydrogen . MoSe 2 is one of the low-cost candidates; however, its activity for hydrogen evolution reaction (HER) is still not satisfactory due to the low conductivity and poor electrical contact with the charge collection substrate. Herein, we provide a simple approach of synthesizing vertically aligned MoSe 2 nanoplatelets on the urchin-like HER-active conductive CoSe 2 nanowire array. Nanostructured MoSe 2 /CoSe 2 hybrid catalysts obtained a current density of 10 mA cm −2 at overpotentials of only 129 mV, with a small Tafel slope of 38.2 mV dec −1 , which is superior to those of most transition metal dichalcogenides (MoSe 2 , MoSe 2 –CoSe 2 hybrids, and so on). The abundant exposed active sites of MoSe 2 , as well as an efficient electrical contact between MoSe 2 nanosheets and CoSe 2 nanowires, which is beneficial for the outstanding HER performance of MoSe 2 /CoSe 2 hybrid electrode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Haonan Wang,Kaifeng Yu,Pengtao Wang,Pengcheng Jia,Yongzhi Yuan,Ce Liang
Metal-organic frameworks (MOFs) have the advantages of controllable chemical properties, rich pore structures and reaction sites and are expected to be high-performance anode materials for the next generation of potassium-ion batteries (PIBs). However, due to the large radius of potassium ions, the pure MOF crystal structure is prone to collapse during ion insertion and processing, so its electrochemical performance is quite limited. In this work, a hollow carbon sphere-supported MOF-derived Co/CoSe heterojunction anode material for potassium-ion batteries was developed by a hydrothermal method . The anode has high potassium storage capacity (461.9 mA h/g after 200 cycles at 1 A/g), excellent cycling stability and superior rate performance. It is worth noting that the potassium ion storage capacity of the anode material shows a gradual upward trend with the charge–discharge cycle, which is 145.9 mA h/g after 3000 cycles at a current density of 10 A/g. This work demonstrates that MOF-derived CoSe anodes with high capacity and low cost may be promising candidates for the introduction of potassium ion storage.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Xiang Zhang,Jun Zhou,Yuying Zheng,Dongyang Chen
Bimetallic transition-metal selenides have emerged as promising anode materials for lithium-ion batteries (LIBs). However, they suffer from rapid capacity fading which is originated from significant chemical and mechanical degradation during lithiation/delithiation processes. Herein, nitrogen-doped graphene aerogel (NGA) with high porosity is prepared via a templated method and serves as the matrix for the uniform growth of sheet-like binary transition-metal selenides (MoSe 2 –CoSe 2 ). The porous NGA with high specific surface area provides a stable and conductive network, which can accelerate electron transmission and shorten the diffusion distance of Li ions . Furthermore, the MoSe 2 –CoSe 2 nanosheets can offer adequate specific capacity because of its high accessibility and multiple redox properties. As a result, the MoSe 2 –CoSe 2 /NGA-10 composite delivers high Li-ion storage capacity (1260 mAh g −1 at 0.1 A g −1 ), excellent rate capability (702 mAh g −1 at 5 A g −1 ), and stable cycling performance (914 mAh g −1 at 1 A g −1 after 200 cycles), demonstrating its great potential for LIB applications.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
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2018
·Vol. 6
·期 26
·12701-12707
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IF 9.931
Bo Wang,Zegao Wang,Xinqiang Wang,Binjie Zheng,Wanli Zhang,Yuanfu Chen
For the first time, porous microspheres of bimetallic CoSe2–MoSe2 hybrids with reduced graphene oxide and amorphous carbon (CS-MS/rGO-C) are synthesized through a facile, low-cost and scalable spray drying approach and a subsequent selenization process. The CS-MS/rGO-C electrocatalyst delivers excellent performance for the hydrogen evolution reaction (HER) in both acidic and alkaline media: in acidic solution, CS-MS/rGO-C has a very low onset potential of −142 mV vs. RHE and a low Tafel slope of 51.3 mV dec−1, and the overpotential at −10 mA cm−2 is as low as −195 mV vs. RHE; in alkaline media, the onset potential of CS-MS/rGO-C is −125 mV vs. RHE, and the Tafel slope is 83.2 mV dec−1, and the overpotential at −10 mA cm−2 is −215 mV vs. RHE. Moreover, it has outstanding long-term stability in both media even after 1000 cycles. The outstanding HER performance of CS-MS/rGO-C can be attributed to its bi-metallic composition, porous rGO-C microsphere structure, and conductive rGO-C skeleton, which can not only provide abundant active sites, but also guarantee high conductivity for CS-MS, thus facilitating the charge transfer. This work provides new insights into scalable synthesis of low-cost electrocatalysts with high efficiency and long-term stability, which can be extended to large-scale production of other advanced electrocatalysts to replace precious Pt-based catalysts for hydrogen evolution.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Xin Lei Xu,Yi Wei Zhou,Yue Yu,Shi Gang Liu,Lei Han
It is imperative to design a highly selective, sensitive, and portable approach for the reliable determination and monitoring of mercury ion (Hg 2+ ) given its severe toxicity to both ecosystems and public health. Herein, we develop a colorimetric and photothermal-derived multimodal sensor for point-of-care testing of Hg 2+ based on the Hg 2+ -sensitized oxidase-mimetic activity of CoSe 2 nanorods. The synthesized CoSe 2 nanorods show negligible oxidase-mimetic activity. It can bind with CoSe 2 nanorods via an Hg-Se bond when Hg 2+ is present. The generation of HgSe on the surface of CoSe 2 nanorods booms the oxidase-like activity of CoSe 2 nanorods to catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) into oxidative TMB (oxTMB), generating a hyperchromic effect and light-driven thermal effect. Consequently, the color and absorbance of the solution changed, realizing the colorimetric and visual sensing of Hg 2+ . The limit of detection (LOD) is 7.3 nM for colorimetry. Meanwhile, a photothermal sensor was also developed under the drive of a laser with a LOD of 12.3 nM. The developed sensor also shows high selectivity toward Hg 2+ because of the strong affinity between the CoSe 2 and Hg 2+ . Furthermore, the latent application of this sensor is confirmed by determining Hg 2+ in real water samples. More significantly, multimodal detection not only enhances accurate detection results through mutual authentication of different signals but also satisfies the demands of diversified detection by consolidating the advantages of photothermal and colorimetric approaches.
研究领域:
分析化学
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环境监测
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纳米生物技术
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传感技术
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重金属检测
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Xiaoying Cui,Lina Lv,Ke Zhao,Panpan Tian,Xipeng Chao,Ying Li,Baozhong Zhang
Overuse of enrofloxacin (ENR) has posed a potential threat to ecosystems and public health, so it is critical to sensitive and accurate determination of ENR residues. In this work, a novel ultra-sensitive and specific electrochemical aptasensor was fabricated based on the cobalt diselenide loaded gold and platinum nanoflowers (Au@Pt NFs/ CoSe 2 ) and Exonuclease III (Exo III)-assisted cycle amplification strategy for the detection of ENR. Au@Pt NFs/ CoSe 2 nanosheets as the substrate material, with large surface area, accelerate electron transfer and attach more DNA probes on the electrode substrate, have effectively enhanced the electrochemical performance of the electrode. With the existence of Enrofloxacin (ENR), the aptamer recognizes and binds to ENR, thus the signal probe cDNA was released and immobilized onto the electrode surface to hybridized with methylene blue (MB) labelled DNA (MB-DNA), thereby triggering the Exo III-assisted cycle for further signal amplification. As expected, the prepared aptasensor demonstrated excellent sensitivity and selectivity, with a wide linear range from 5.0 × 10 −6 ng/mL to 1.0 × 10 −2 ng/mL for ENR, a low detection limit of 1.59 × 10 −6 ng/mL. Consequently, this strategy provided a promising avenue for ultrasensitive and accurate detection of ENR in milk samples.
研究领域:
分析化学
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纳米技术
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环境科学
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公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yujie Wei,Jianying Wang,Yahang Shang,Chang Lv,Xiaoyang He,Tao Wang,Zuofeng Chen,Lvlv Ji,Sheng Wang
Transition metal dichalcogenides are recognized as promising electrocatalysts for hydrogen evolution reaction (HER), but their catalytic performances still require further enhancement. Herein, Ru-doped cubic CoSe2 with leaf-like microarray hollow structure supported on carbon cloth (Ru-c-CoSe2@CC) is rationally fabricated via a strategy involving in situ growth of Co-ZIF, Ru3+ ions etching and selenization steps. The chemical etching step transforms the precursor sample from Co-ZIF to RuCo-LDH and the subsequent selenization step observes crystal phase transformation and Ru-doping of CoSe2 to form Ru-c-CoSe2. Compared with orthorhombic CoSe2 and pristine c-CoSe2, the optimized electrocatalyst Ru-c-CoSe2/CC-3 shows significantly enhanced HER catalytic performance in both acidic and alkaline media. Theoretical investigations demonstrate the charge-transfer redistribution triggered by Ru dopants, optimizing the electronic states of the adjacent Co atoms with boosted intrinsic catalytic activity. Additionally, the leaf-like microarray hollow structure is highly desirable in active site expose and mass transfer due to its superaerophobic interfacial property.
研究领域:
材料科学
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电化学
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催化
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2025
·
IF 17.5
Yingnan Wang,Jinting Wu,Qian Zhang,Yingjun Tan,Jian Gao,Xiao-Dong Zhu,Yong-Chao Zhang,Shaojun Guo
Given the trade-off between activity and selectivity, typical pure CoSe 2 catalyst that excels in the initial proton-coupled electron transfer, however, usually underperforms in the subsequent reaction process, leading to low performance for acidic 2e − oxygen reduction reaction (ORR) to H 2 O 2 . Here, we report a class of Zn–Co pair active sites on the defected CoSe 2- x . The Zn–Co pair active site can well modulate electronic structure for enhancing the adsorption and activation of ∗O 2 to achieve high-selectivity electrosynthesis of H 2 O 2 . The surrounding Co site has the optimal Gibbs free energy for ∗OOH because of the d-p orbital hybridization between the near-end O (∗OOH) and Co near the Fermi level. The Zn 1 -Co/CoSe 2- x catalyst achieves high selectivity of 95% under 0 V against a reversible hydrogen electrode (RHE) and the maximum productivity of 2.26 mol g cat. −1 h −1 at 250 mA cm −2 , which is among the best non-noble metal-based compound catalysts in an acidic medium.
研究领域:
材料化学
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电化学
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催化科学
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能源化学
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无机功能材料
✓ 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）