JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaobo Yang,Shuang Liang,Guanzhihui Wang,Bao Zhou,Zhuoqi Duan,Zaixin Xie,Yongmao Hu
Developing oxygen evolution reaction (OER) electrocatalysts with high efficiency, low cost and good stability for water splitting is significant to relieve the energy crisis and environmental pollution. Herein, NiCo alloy (NC) nanoparticles (NPs) embedded N-doped carbon fibers (NCF) were prepared by electrospinning and carbonization. The surfaces of the NC@NCF were anchored with nanocrystalline NiCo 2 S 4 (NCS) in a following solvothermal process to form NCS-NC@NCF composite. Synergistic effect of the alloy (NC) and the semiconductor (NCS) was successfully stimulated, i.e., rapid charge separation and transfer was achieved during the OER process. In addition, the carbon fibers substrate is beneficial for good dispersion of the NC and NCS NPs as well as the conductivity improvement of the as-prepared NCS-NC@NCF catalyst. The prepared NCS-NC@NCF catalyst electrode owns good OER performances of a low overpotential of 291 mV, 342 mV and 376 mV to respectively deliver current densities of 10 mA cm −2 , 50 mA cm −2 and 100 mA cm −2 , which are respectively 19 mV, 82 mV and 116 mV lower than those of the RuO 2 electrode (310 mV, 424 mV and 492 mV), indicating the great potential of the catalyst in water splitting. Moreover, good durability of current density retention of 90.7 % is observed after 60 h of continuous OER polarization for the catalyst. Additionally, a two-electrode system composed of commercial Pt/C and the NCS-NC@NCF electrodes only needs a driven voltage of 1.51 V to afford 10 mA cm −2 for water splitting, which is superior to that (1.69 V) of the Pt/C||RuO 2 system.
研究领域:
材料科学
·
电化学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2024
·
IF 8.6
Yu Wan,Huiyao Li,Youlan Zou,Wenhao Tang,Shiyan Deng
Enhancing ionic conductivity and Li dendrite inhibition capability in poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) is imperative for the advancement of all-solid-state lithium metal batteries (ASSLMBs). Herein, we incorporate the inorganic functional nanofiller of hollow porous polyhedral Co 3 O 4 to facilitate the formation of amorphous regions, thereby enhancing the migration of PEO chain segments. The suitable hollow porous polyhedral structure offers the advantage of minimizing filler agglomeration and providing a continuous and extensive network for ion transport, thereby enhancing ionic conductivity. The addition of 7 wt% Co 3 O 4 to PEO SPEs (PEO+ Co 3 O 4 –7) results in an enhanced ionic conductivity of 2.68 × 10 −3 S cm −1 and the Li + transference number of 0.493 at 60 °C. Furthermore, Li//Li symmetric cell with PEO+ Co 3 O 4 –7 SPEs enables a stable cycle for 1000 h at 0.2 mA cm −2 . LiFePO 4 / PEO+ Co 3 O 4 –7/Li cell indicates an initial capacity of 149 mA h g −1 and a reversible capacity of 113 mA h g −1 after 200 cycles at 0.2C. This study emphasizes the importance of constructing efficient ion transport paths through structural design.
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
·
2021
·
IF 9.229
Xiaoyu Zhang,Ge Ma,Lingling Shui,Guofu Zhou,Xin Wang
Ultrathin Co3O4 nanosheets (NSs) with abundant oxygen vacancies on conductive carbon nanotube (CNT) nanocomposites (termed as Co3O4-NSs/CNTs) are easily achieved by an effective NaBH4-assisted cyanogel hydrolysis strategy under ambient conditions. The specific capacitance of Co3O4-NSs/CNTs with 5% CNT mass can reach 1280.4 F g–1 at 1 A g–1 and retain 112.5% even after 10 000 cycles, demonstrating very high electrochemical capability and stability. When assembled in the two-electrode Co3O4-NSs/CNTs-5%//reduced graphene oxide (rGO) system, a maximum specific energy density of 37.2 Wh kg–1 (160.2 W kg–1) is obtained at room temperature. Ultrathin structure of nanosheets, abundant oxygen vacancies, and the synergistic effect between Co3O4-NSs and CNTs are crucial factors for excellent electrochemical performance. Specifically, these characteristics favor rapid electron transfer, complete exposure of the active interface, and sufficient adsorption/desorption of electrolyte ions within the active material. This work gives insights into the efficient construction of two-dimensional hybrid electrodes with high performance for the new-generation energy storage system.
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
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Qianqian Huang,Jiayin Zhang,Zhengyu He,Penghui Shi,Xin Qin,Weifeng Yao
N-doped carbon materials have great potential as functional materials for water pollution control. However, the synthesis of green and sustainable N-doped carbon catalysts face numerous challenges. This study uses a thermal treatment by directly heating a homogeneous mixture of cobalt acetate and dimethylglyoxime to synthesize lamellar ordering Co 3 O 4 /N/C compounds. Dimethylglyoxime was chosen to play duple roles as both nitrogen and carbon source. The obtained N-doped carbon material was used as a catalyst for effective aniline degradation by activating peroxymonosulfate (PMS). In this approach, nanomaterials with good catalytic performance, high stability, and magnetic property can be obtained, which facilitate recycle convenience. In this study, graphitic N is found to improve electron mobility, and the lone pair of pyrrolic-like N electrons tends to form effective Co-N 4 moieties with Co species, which can increase the catalyst activity. Therefore, the prepared catalyst has higher activity than individual Co 3 O 4 . Furthermore, the effects of N-doped carbon materials on aniline degradation by activated PMS and the proposed reaction pathways for the mineralization of aniline were explain in detailed.
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
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Lin Zhichao,Qiao Xiuwen
Coral reef has a unique dendritic structure with large specific surface area, rich pore structure, so that it can be attached to a large number of zooxanthellae for gas exchange. Coral reef ecosystems are also known as underwater rainforests. Inspired by this biological structure, we designed and fabricated coral-like Co 3 O 4 decorated N-doped carbon particles (Co 3 O 4 /N-CP). The obtained Co 3 O 4 /N-CP-900 catalyst shows efficient ORR electrocatalytic performances in an alkaline medium with a positive onset and half-wave potentials of 0.97 and 0.90 V (vs. RHE), as well as a high diffusion-limited current density (5.50 mA cm −2 ) comparable to that of a Pt/C catalyst (5.15 mA cm −2 ). It also displays better stability and methanol tolerance than commercial Pt/C. In addition, the Co 3 O 4 /N-CP-900 electrode has a high specific capacitance of 316.2 F g −1 in 6 M KOH, as well as good rate capabilities and excellent cycle performance. These results are due to large surface area, narrow pore size distribution, high density electrochemical energy conversion and storage activity centers. This method presented here offers an effective path for the development of high performance multi-functional carbon-based materials for ORR and supercapacitor applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2016
·Vol. 3
·期 12
·1500691
·
IF 3.365
Qian Wang,Meiyan Wu,Shangjun Meng,Xiaoxian Zang,Ziyang Dai,Weili Si,Wei Huang,Xiaochen Dong
Porous cobalt oxide (Co 3 O 4 ) nanosheets, vertically aligned on reduced graphene oxide (rGO) modified 3D carbon cloth (CC), are synthesized by using a facile diffusion method at room temperature following a thermal annealing process (named as Co 3 O 4 /rGO/CC). Employed as freestanding electrochemical electrode, the detection behaviors of the Co 3 O 4 /rGO/CC toward hydrazine have been systematically investigated. It exhibits a high sensitivity (1306.7 μA mM −1 cm −2 ), good stability, and excellent selectivity. The detection limit for hydrazine can reach to 0.141 × 10 −6 M with a linear response range of 5–470 × 10 −6 M. The outstanding sensing properties of the Co 3 O 4 /rGO/CC electrode can be attributed to the electrocatalytic activity of porous Co 3 O 4 nanosheets, the good conductivity of carbon cloth, and the large surface area of the 3D structure. It presents potential applications in the field of environment protection, food analysis, medicine, and so on.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Baocang Liu,Yan Cheng,Bo Cao,Minghao Hu,Peng Jing,Rui Gao,Yaping Du,Jun Zhang,Jinghai Liu
A multicomponent 3D monolithic electrode was designed that consists of Co single atoms anchored/nitrogen, sulfur co-doped carbon nanotubes (CoSAs-NS-CNTs) on carbon cloth (CC) with ultra-thin MoS 2 nanosheets externally decorated and ultra-small CoS 2 nanodots internally confined (MoS 2 /CoSAs-NS-CNTs@CoS 2 /CC) to form a hybrid heterojunction electrode with double interfaces as vectorial electron transport pathways for promoting electrocatalytic performance. The integration of well-distributed MoS 2 nanosheets and CoS 2 nanodots linked with Co single atoms anchored/N, S co-doped CNTs endows abundant multiple active sites, outstanding conductivity, and the downshifted d-band center with a thermodynamically favorable hydrogen adsorption free energy (ΔG H* ) for effectively catalyzing hydrogen evolution reaction (HER). As a result, the optimal MoS 2 /CoSAs-NS-CNTs@CoS 2 /CC electrode exhibits outstanding HER performance with overpotentials of 72 and 56 mV at 10 mA cm −2 and small Tafel slopes of 59.4 and 43.2 mV dec -1 in acidic and alkaline solutions, respectively, outperforming most of the previously reported molybdenum/cobalt sulfide-based electrocatalysts. Moreover, the electrode also displays good durability and stability reflected from the small decrease on activity after 5000 CV cycles and nearly no decay in current density after electrolysis for 20 h.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yu-Qing Yang,Shen-Jing Ji,Nian-Tzu Suen
Reported are the synthesis, material characterization, and electrocatalytic hydrogen evolution reaction (HER) in acid and alkaline electrolytes for the Brewer intermetallic phase, Nb6Co7 and Mo6Co7. It was realized that the overpotential at a current density of 10 mA/cm2 (η10) for Nb6Co7 (η10 = 62 mV) and Mo6Co7 (η10 = 143 mV) are both much lower than that of using a single Co metal (η10 = 253 mV) in alkaline electrolytes. The enhancement of electrocatalytic HER activity of Nb6Co7 and Mo6Co7 can be attributed to the hypo-hyper-d-electronic interaction between Nb/Mo and Co elements. Based on the result of density functional theory calculation, alloying between Nb/Mo and Co elements will increase the antibonding state population of the Co–Co bond near the Fermi level (EF), which induces the synergistic effect to influence the adsorption energy of the H atom (ΔGH) on the surface of Nb6Co7 and Mo6Co7. Moreover, the role of the Nb element is not only a simple electron donor but is also an anchor position for the OH molecule (i.e., dual function) due to the bonding character of the Nb–Co bond near EF. It can reduce the OH position effect as well as the activation energy for water dissociation, which rationalizes the high and robust HER performance of Nb6Co7 to that of commercial Pt/C (η10 = 67 mV) in alkaline electrolytes.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 13
·4918
·
IF 4.6
Kaixuan Yang,Naimeng Chen,Xiaomiao Guo,Ruoqi Zhang,Xiaoyu Sheng,Hui Ge,Zhiguo Zhu,Hengquan Yang,Hongying Lü
The search for non-noble metal catalysts for chemical transformations is of paramount importance. In this study, an efficient non-noble metal catalyst for hydrogenation, hexagonal close-packed cobalt (HCP-Co), was synthesized through a simple one-step reduction of β-Co(OH)2nanosheets via a temperature-induced phase transition. The obtained HCP-Co exhibited several-times-higher catalytic efficiency than its face-centered cubic cobalt (FCC-Co) counterpart in the hydrogenation of the C=C/C=O group, especially for the 5-hydroxymethylfurfural (HMF) hydrogenation (8.5-fold enhancement). Density functional theory calculations demonstrated that HMF molecules were adsorbed more firmly on the (112_0) facet of HCP-Co than that on the (111) facet of FCC-Co, favoring the activation of the C=O group in the HMF molecule. The stronger adsorption on the (112_0) facet of HCP-Co also led to lower activation energy than that on the (111) facet of FCC-Co, thereby resulting in high activity and selectivity. Moreover, HCP-Co exhibited outstanding catalytic stability during the hydrogenation of HMF. These results highlight the possibility of fabricating hydrogenation catalysts with satisfactory catalytic properties by precisely tuning their active crystal phase.Keywords:phase-controlled;temperature-induced phase transition;HCP-Co;FCC-Co;hydrogenation
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Wanqing Fang,Li Fu,Ai Qin,Yimin Lin,Rongzi Xv
Photoelectrochemical (PEC) water splitting has become an attractive way to sustainable hydrogen production. Herein, a cobalt ion-doped BiVO4 photoanode (Co:BiVO4) is prepared by an electrodeposition-solution drop-casting strategy. Co:BiVO4 presents a three-dimensional coral sheet structure with Co3O4 particles on the surface. The surface will be covered with an ultrathin cobalt borate (CoBi) film after PEC testing in borate buffer. The photocurrent density of Co:BiVO4 reaches 4.45 mA/cm2 at 1.23 VRHE (2.46 times that of BiVO4). Co:BiVO4 also exhibits self-healing properties in borate buffer during the PEC test. The excellent PEC performance of the Co:BiVO4 photoanode is due to the synergy effect caused by Co doping. Some of the Co ions are doped into the BiVO4 lattice to increase the electronic conductivity. Excess Co ions form the Co3O4 co-catalyst on the BiVO4 surface to promote the water oxidation reaction. After PEC testing in borate buffer, the CoBi film covering the Co:BiVO4 surface acts as a co-catalyst to provide more active sites for water oxidation. The applied bias photon-to-current efficiency, charge separation, and injection efficiency of the Co:BiVO4 photoanode are 0.94%, 63.19%, and 87.73% (3.62, 2.39, and 2.95 times that of bare BiVO4). This work provides a wealth of insights into the influence of Co:BiVO4 on PEC water oxidation in borate buffer and demonstrates the self-healing function of the system.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 44
·20580-20588
·
IF 4.682
Yan Jingjing,Zhu Chengwei,Liu Baohua,Shu Ruiwen
A facile synthetic route based on the assistance of magnetic field is reported to fabricate core–shell CoB@Co(OH) 2 nanochains for purpose of the high conductive pathway and enhanced pseudocapacitance in 3 M LiOH electrolyte. By adjusting the loading amount of the shell Co(OH) 2 nanosheets anchored on the core CoB alloy surface, the typical core–shell CoB@Co(OH) 2 is endowed with the appropriate pore volume of 0.27 cm 3 g −1 and the high accessible electrode/electrolyte interfacial area (62.3 m 2 g −1 ) and the fast conductive highway; meanwhile taking advantages of core–shell structure can be favor for fast ion transport between the electrode/electrolyte interphase and rapid electron transfer. Benefiting from the advantageous properties, the typical CoB@Co(OH) 2 electrode exhibits a high specific capacitance of 492.8 F g −1 in three-electrode device together with good cyclic stability (90.4% capacitance retention) during continuously 5000 cycles at 2 A g −1 . This work can provide an inspiring strategy for rational designing of core–shell CoB@Co(OH) 2 , and indicate their potential energy application in alkaline electrolyte. Graphical abstract
Core–shell CoB@Co(OH) 2 electrode with rapid conductive highway achieves the broaden voltage of 0.8 V and the enhanced supercapacitive performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Qi Gan,Jiajun Zhang,Yan Cao,Shuang Xu,Peng He,Huiquan Li,Renlong Liu,Liguo Wang
Non-noble metal-based catalysts are highly desired for the catalytic hydrogenation of nitroaromatics. Here we reported a catalyst of Co 1 /Co n @NCNS prepared with raw materials for efficient hydrogenation of nitrobenzene (NB), in which the Co nanoparticle (Co NP ) was tightly coated in a nitrogen-doped graphite carbon shell, and the Co single atom (Co SA ) was uniformly anchored on graphite support. The catalyst achieved a conversion of NB for over 99% under mild conditions at 50 °C and 10 bar. The catalyst was able to consistently maintain over 90% conversion and 99% selectivity for 100 h, and exhibited outstanding catalytic activity and selectivity (>99%) towards the reduction of various nitroaromatics, even though for halogen-containing substrates. The superior catalytic performance resulted from the synergy between the internal Co NP and the surface Co SA on the nitrogen-doped carbon shells. Both Co NP and Co SA synergistically facilitated electron transfer to nitrogen atoms in the carbon framework, and rendered them catalytic activity during the hydrogenation.
研究领域:
催化化学
·
材料科学
✓ 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）