Journal of Energy Chemistry
·
2022
·
IF 13.599
Linfeng Fan,Yaxin Ji,Genxiang Wang,Zhifang Zhang,Luocai Yi,Kai Chen,Xi Liu,Zhenhai Wen
Electrolytic water splitting, as a promising route to hydrogen (H 2 ) production, is still confronted with the sluggish anodic oxygen evolution reaction (OER) and its less value-added O 2 production. Herein, we report a bifunctional electrode fabricated by in situ growth of Mn-doped CoSe 2 nanonetworks on carbon fiber cloth (Mn-CoSe 2 /CFC), which shows attractive electrocatalytic properties toward glycerol oxidation reaction (GOR) in alkali and hydrogen evolution reaction (HER) in acid. A flow alkali/acid hybrid electrolytic cell (fA/A-hEC) was then developed by coupling anodic GOR with cathodic HER with the Mn-CoSe 2 /CFC bifunctional electrode. Such fA/A-hEC enables a rather low voltage of 0.54 V to achieve 10 mA cm −2 , and maintain long-term electrolysis stability over 300-h operation at 100 mA cm −2 with Faraday efficiencies of over 99% for H 2 and 90% for formate production. The designed bifunctional electrode in such innovative fA/A-hEC device provides insightful guidance for coupling energy-efficient hydrogen production with biomass upgradation.
研究领域:
材料科学
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电化学
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 9
·2550-2557
·
IF 5.934
Weidan Li,Pin Ma,Fanfan Chen,Rui Xu,Zhihai Cheng,Xiong Yin,Yuan Lin,Leyu Wang
Cost-effective, Pt-free catalysts possessing superior electrochemical activity and stability are highly desirable for triiodide reduction reaction in dye-sensitized solar cells (DSCs). Herein, CoSe2 nanoparticles embedded in porous carbon shells (CoSe2/CS) were explored as highly efficient catalysts toward triiodide reduction reaction. The CoSe2/CS composites were fabricated using a soft-template approach involving the carbonization and selenization processes. The CoSe2 nanoparticles were well distributed within highly graphitized nitrogen-doped carbon nanoshells. More importantly, the CoSe2/CS catalysts presented both high catalytic performance and long-term stability, outperforming those of the thermally-deposited Pt electrode. Furthermore, the optimized DSC device with a CoSe2/CS catalyst-based counter electrode showed a power conversion efficiency of 7.54%, exceeding that of the thermally-deposited Pt (7.40%) counterpart. The enhanced catalytic activity, long-term stability and photovoltaic efficiency can be attributed to the much more reaction sites provided by CoSe2 nanoparticles embedded within the porous carbon shells, as well as the better band matching with the potential of the I3−/I− redox couple, revealed by the Kelvin probe force microscope measurement. This work will provide a strategy to construct low-cost, highly efficient and stable non-Pt catalysts for photovoltaic applications.
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
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhiming Liu,Dazhi Gao,Lina Hu,Hui Liu,Ying Li,Yanming Xue,Fang Liu,Jun Zhang,Chengchun Tang
High activity and stable hydrogen evolution reaction (HER) catalysts have an indispensable influence on hydrogen production . Pyrite cobalt selenide (CoSe 2 ) is considered an excellent non-noble metal compound HER catalyst due to its low price and excellent electrical conductivity . However, the HER catalytic activity of CoSe 2 is still not ideal because of the weak adsorption of hydrogen on its active Co site. The anion introduction can improve the electronic structure of the catalyst and thereby enhance the performance of HER. Here, we report that B-doped CoSe 2 nanomaterials on carbon cloth (B-CoSe 2 /CC) were successfully synthesized. Compared with CoSe 2 , B-CoSe 2 exhibits better HER performance in 1 M KOH. The overpotential of B-CoSe 2 catalyst is only 153 mV at 10 mA cm −2 . Tafel slope of B-CoSe 2 /CC sample is only 85 mV dec −1 . In addition, B-CoSe 2 /CC exhibits perfect long-term durability and cycle stability. Density functional theory (DFT) calculations illustrate that the doping of B improves the intrinsic conductivity of CoSe 2 and optimizes the hydrogen adsorption free energy (ΔG H* ) of Se and Co sites. This work not only proposes a new anion doping strategy to improve the electronic structure of cobalt-based selenides for improved HER performance, but also provides a reference for the screening and design of other transition metal compound HER electrocatalysts .
研究领域:
材料科学
·
电化学
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催化
·
可再生能源
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xike Tian,Xiang Wang,Chu Dai,Yong Li,Chao Yang,Zhaoxin Zhou,Yanxin Wang
Glucose concentration in human body is a significant indicative for diabetes screening, so it is very significant to develop rapid and sensitive methods for glucose detection. Herein, CoSe 2 /reduced graphene oxide (CoSe 2 /rGO) nanohybrids were synthesized via a simple and convenient hydrothermal method, and also their morphologies and compositions were systematically characterized. The CoSe 2 /rGO nanohybrids were found to possess an intrinsic peroxidase-like activity and can effectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H 2 O 2 ) accompanied with a blue color change. The catalytic activity of CoSe 2 /rGO nanohybrids is matched with the typical Michaelis–Menten kinetics and highly dependent on reaction time, pH, incubation temperature, and H 2 O 2 concentration. The peroxidase-like CoSe 2 /rGO nanohybrids were successfully applied for the detection of H 2 O 2 and glucose with the detection limit as low as 0.23 μM and 0.553 μM, respectively. Furthermore, some other carbohydrates, such as lactose, sucrose, galactose and fructose have no interferences with the detection of glucose. The detection platforms for glucose developed in the present work not only confirmed that the CoSe 2 /rGO nanohybrids possess intrinsic peroxidase-like activity but also showed great potential applications in varieties of simple, robust, and easy-to-make analytical approaches in the future.
研究领域:
分析化学
·
纳米技术
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生物传感器
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糖尿病研究
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 11
·2725-2734
·
IF 6.569
Di Li,Yingying Xing,Changjian Zhou,Yikai Lu,Shengjie Xu,Xiangli Shi,Deli Jiang,Weidong Shi
Due to the low-carbon economy requirement in large-scale industrial applications, exploration of active, robust, resourceful, low-cost and efficient oxygen evolution reaction (OER) electrocatalysts is urgently needed. In this work, we report a Fe–N co-doped cobalt selenide nanosheet array (Fe–N–CoSe2) on nickel foam (NF) as a highly efficient OER electrocatalyst via an anion and cation co-doping strategy using a metal–organic framework (MOF) as the precursor. The nanosheet arrays grown on NF without an additional binder are not only beneficial for accelerating the charge transfer, but also for suppressing electrocatalyst shedding. Furthermore, the nanosheet structure constructed using nanograins could promote electrolyte penetration and gas diffusion and increase the active sites. More importantly, the Fe and N element doping can further provide additional active sites, regulate the electronic structure and boost the OER kinetics. In view of the abovementioned points, the as-prepared Fe–N–CoSe2 electrocatalyst exhibits outstanding OER performance and long-term durability. It affords a current density of 50 mA cm−2 at a small overpotential of 270 mV with a Tafel slope of 62.7 mV dec−1, and the Fe–N–CoSe2 electrocatalyst has only a small attenuation of 1.9% after a 100 h constant test at 100 mA cm−2 in alkaline solution, which is superior to the commercial RuO2 electrode. These results offer a potential approach for the preparation of effective and robust OER electrocatalysts as substitutes to replace the expensive commercial electrocatalysts based on element doping.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yuan Ma,Nanpu Cheng,Chunhong Li,Muhammad Aizaz Ud Din,Lan Zhao,Nengcong Pan,Yuhan Lei
The development of low-platinum electrocatalysts with high activity in alkaline media is critical for sustainable and cost-effective hydrogen production. In this study, we report a dual-phase engineering strategy to synthesize Pt-CoSe 2 nanoparticles embedded in nitrogen-doped carbon (Pt-CoSe 2 @NC) via controlled pyrolysis of ZIF-67. The resulting catalyst features hierarchical porosity and a 3D conductive network that confines ultrafine Pt particles and enhances interfacial charge and mass transfer. Strong Pt-CoSe 2 interactions induce electron redistribution, elevating cobalt oxidation states and optimizing hydrogen adsorption energetics. Nitrogen doping and surface-oxygenated Co species further boost performance. The optimized Pt-CoSe 2 @NC catalyst exhibits an overpotential of 37.4 mV at 10 mA cm −2 , a Tafel slope of 60.4 mV dec -1 , and remains over 90 % of its initial current density after 24 h in 1 M KOH. Density functional theory (DFT) calculations reveal a shift in the d -band center of Pt due to Pt-CoSe 2 interface formation, leading to near-thermoneutral hydrogen adsorption energy. This work integrates MOF-derived structural control with electronic interface modulation, offering a generalizable blueprint for designing efficient, low-noble-metal HER catalysts.
研究领域:
材料科学
·
电催化
·
能量存储与转换
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纳米材料
·
密度泛函理论
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaofei Lei,Xuan Xie,Kanjun Sun,Sitong Liu,Tianyu Hou,Hui Peng,Guofu Ma
Transition metal selenides embedded into a nitrogen, sulfur co-doped carbon materials (TMS@NSC) are promising electrocatalysts to effectively address the sluggish kinetics of oxygen evolution reaction (OER). However, the OER catalytic activity of single metal TMS@NSC is still limited by insufficient active sites. Hence, FeSe 2 and CoSe 2 nanoparticles self-generated and confined in N, S-doped porous carbon (FeSe 2 /CoSe 2 @NSC) catalyst has been synthesized by in-situ polymerization and the subsequent low temperature selenization strategy, aiming to increase the active sites of TMS@NSC. The hybridized FeSe 2 /CoSe 2 @NSC catalyst has excellent OER catalytic activity and good durability in alkaline media, which only requiring an overpotential as low as 278 mV to drive a current density of 10 mA cm −2 , outperforming most recently reported selenide catalysts and commercial RuO 2 catalysts. The high catalytic activity of FeSe 2 /CoSe 2 @NSC catalyst is attributed to the rapid electron transfer between FeSe 2 and CoSe 2 in the unique N, S-doped graphene nanosheets, which effectively inhibits the aggregation of nanoparticles, fully exposes the active sites and provides pathway for oxygen release during the OER process. Moreover, the overall water splitting device assembled with FeSe 2 /CoSe 2 @NSC catalyst showed low overpotential of 1.57 V. This study provides a feasible strategy for the design of high active and stable TMS@NSC catalysts for OER and other energy conversion applications.
研究领域:
材料科学
·
电化学
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200827
·
IF 9.14
Qimin Peng,Xiaoling Zhuang,Longgui Wei,Luyan Shi,Tayirjan Taylor Isimjan,Ruobing Hou,Xiulin Yang
Graphical A thorny challenge : A nanothorn-like superhydrophilic Nb−CoSe 2 /CC (CC=carbon cloth) catalyst is fabricated through a facile in-situ hydrothermal selenization and Ar annealing strategies. The catalyst illustrates an excellent oxygen evolution activity (297 mV at 200 mA cm −2 ), outstanding long-term durability, and good overall water splitting performance (1.93 V at 500 mA cm −2 ). Developing cost-effective, highly active, and robust electrocatalysts for oxygen evolution reaction (OER) at high current density is a critical challenge in water electrolysis since the sluggish kinetics of the OER significantly impedes the energy conversion efficiency of overall water splitting. Here, a 1D nanothorn-like Nb−CoSe 2 /CC (CC=carbon cloth) structure was developed as an efficient OER catalyst. The optimized Nb−CoSe 2 /CC catalyst exhibited remarkable OER performance with the low overpotentials of 220 mV at 10 mA cm −2 and 297 mV 200 mA cm −2 and a small Tafel slope (54.1 mV dec −1 ) in 1.0 m KOH electrolyte. More importantly, the Nb−CoSe 2 /CC electrode displayed superior stability after 60 h of continuous operation. In addition, cell voltages of 1.52 and 1.93 V were required to achieve 10 and 500 mA cm −2 for the electrolyzer made of Nb−CoSe 2 /CC (anode) and the Pt/C (cathode). Density functional theory (DFT) calculations combined with experimental results revealed that incorporating niobium into the CoSe 2 could optimize the adsorption free energy of the reaction intermediates and enhance the conductivity to improve the catalytic activity further. Additionally, the super-hydrophilicity of Nb−CoSe 2 /CC resulting from the surface defects increased the surface wettability and facilitated reaction kinetics. These results indicate that Nb−CoSe 2 /CC intrinsically enhances OER performance and possesses potential practical water electrolysis applications.
研究领域:
电化学
·
材料科学
·
催化
·
能量转换
·
纳米技术
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
Y. Ji,W. Luo,Y. Liu,Z. He,N. Cheng,Z. Zhang,X. Qi,J. Zhong,L. Ren
The bottleneck of alkaline hydrogen evolution reaction lies in the kinetically sluggish brought from multistep reaction processes involving water adsorption and dissociation, as well as hydrogen adsorption. In this work, we successfully synthesized o-CoSe 2 /c-CoSe 2 heterostructures anchored on MoSe 2 nanosheets to powerfully promote reaction processes. As an electrocatalyst , it exhibits a low overpotential of 112 mV at 10 mA/cm 2 and a Tafel slope of 96.9 mV/dec for an alkaline hydrogen evolution reaction . Moreover, the as-prepared catalyst can behave as both cathode and anode for overall water splitting , which only requires 1.61 V cell voltage at 10 mA/cm 2 . Significantly, the cell voltage can be further reduced to 1.53 V at 10 mA/cm 2 for water electrolysis under the simulated solar irradiation owing to such a semiconductor-based heterostructure that facilitates the separation of photogenerated charges. Here, the improving overall performance of this ternary electrocatalyst is attributed to the multifunctionality and synergistic interaction of different components in this heterogeneous material . The work provides a novel strategy to design active catalysts simultaneously using electric energy and solar energy for effective water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 18
·2100156
·
IF 18.808
Wei Sun,Wenqing Zhao,Shaohui Yuan,Liming Zhang,Yue Yang,Peng Ge,Xiaobo Ji
Engineering advanced sodium-ion storage materials with considerable kinetic behaviors have triggered a series of active explorations. However they still suffer from interfacial gaps and uncompleted redox reactions, bringing about poor rate abilities. Herein, through the strategy of salt-fixed and thermochemical manners, the CoSe 2 /O C with interfacial chemical Co O C bonds are successfully prepared, displaying the reduced particles and optimized structural features. Meanwhile, from the analysis of long-term phase changing curves and ex-situ technologies, the CoSe 2 would be decomposed into CoSe and Se phases but captured by the synergistic effect of their physical-chemical evolutions, while the structure and new-type are stabilized after cycling. Profiting from the “bridge” roles of bonds, the electrons are effectively accelerated with the deepening redox reactions. As expected, based on these advantages, the ultra-fast abilities are reached about 346 mAh g −1 at 15.0 A g −1 after 3500 cycles, and their capacity of full-cells are also kept at about 326 mAh g −1 (cathodes Na 3 V 2 (PO 4 ) 3 @C vs anodes CoSe 2 /O C). The detailed analysis of kinetic behaviors strongly demonstrated that the increased interfacial charge storage and conductivities are crucial for promoting the ions-storage abilities. Given this, the rational work is anticipated to provide significant strategies for advanced energy-storage materials.
研究领域:
材料科学
·
电化学
✓ 已验证
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
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiao-Man Cao,Yi-Feng Shao,Yan-Cun Dong,Qingguo Zhang,Hao Ge,Daliang Liu,Qiong Wu,Zhi-Jia Sun
The unique structure and strong interaction of multiphase hybrid materials have garnered significant attention as prospective candidates for electrode materials in the realm of energy storage. The present study presents a rational design of a functional NiSe 2 -CoSe 2 /N, B double-doped carbon hybrid composite (NCS/C NB ), resulting in the emergence of various novel cooperative regulatory mechanisms involving: (i) the heterogeneous structure of NiSe 2 and CoSe 2 generates built-in electric fields to increase electron mobility; (ii) the incorporation of polyatomic double-doped carbon (N, and B) expedites electron transfer rate; intriguingly, (iii) ionic liquids not only serve as polyatomic dopants in the reaction system but also influence the microstructure of the composite. Benefiting from these synergistic effects, the NCS/C NB hybrid exhibits remarkable charge storage capacity and rapid electrochemical kinetics, driven by its multi-fold hollow structure and multicomponent cooperative modulation. The capacity (682 C g −1 at 1 A g −1 ) and rate performance of NCS/C NB surpass those of other monometallic selenides (NiSe 2 /N, B co-doped carbon (NS/C NB ) and CoSe 2 /N, B co-doped carbon (CS/C NB )) within the same system. In the meantime, an asymmetric device using NCS/C NB as the cathode material performs admirably, displaying an exceptional energy density (51.3 Wh kg −1 at 1.28 kW kg −1 ). The present research provides valuable perspectives for the innovative design and fabrication of advanced electrode materials exhibiting exceptional electrochemical properties. We firmly believe that hollow structures featuring multiple cooperative regulatory mechanisms and abundant folds will garner significant attention.
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
危险品化学品经营许可证（带存储）