INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Xinran Zhao,Xiaobo He,Fengxiang Yin,Biaohua Chen,Guoru Li,Huaqiang Yin
In this work, a series of metallic cobalt-molybdenum carbide@graphitic carbon (CoMo(x:y)-T@GC) nanocomposites for the electrochemical hydrogen evolution reaction (HER) were synthesized by a sol-gel method. In the as-prepared nanocomposites, β-Mo 2 C and metallic Co coexisted and were encapsulated by graphitic carbon . The presence of metallic Co effectively enhanced the crystallinity of β-Mo 2 C, charge transfer efficiency and electrochemical active surface area (ECSA), thus resulting in the improved HER catalytic activities of the CoMo(x:y)-T@GC nanocomposites. The optimized electrocatalyst CoMo(0.5:0.5)-800@GC required the lowest overpotential of ∼165 mV to deliver a current density of 10 mA cm −2 in 0.1 M KOH, which was at the forefront compared with recently reported Mo 2 C-based electrocatalysts.
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 Frontiers
·
2021
·Vol. 8
·期 22
·4864-4877
·
IF 6.569
Keding Li,Jun Liao,Siqi Huang,Yuqing Lei,Yong Zhang,Wenkun Zhu
A novel oxidized MXene-supported MCo2O4 (oxidized MXene/MCo2O4, M = Mn, Zn, Cu and Co) nanocomposite was successfully synthesized through a facile hydrothermal assisted calcination method. Various characterization results indicated that MCo2O4 nanoparticles were successfully formed in situ on MXene nanosheets, which effectively reduce the aggregation of nanoparticles and remarkably improve the specific surface area, especially MZC (203.5 m2 g−1). Among the oxidized MXene/MCo2O4 nanocomposites, oxidized MXene/ZnCo2O4 (MZC) enormously ameliorated the performance of AP decomposition. With adding MZC (2.0 wt%), the high-temperature decomposition (HTD) temperature of AP could significantly decrease to 297.1 °C, while the decomposition heat could increase to 1409.6 J g−1, respectively. The apparent activation energy of AP decomposition decreased from 209.6 kJ mol−1 (pure AP) to 104.5 kJ mol−1 (AP mixed with MZC). The excellent catalytic performance of MZC might be due to the synergistic effect of MXene nanosheets and ZnCo2O4 nanoparticles. It could be foreseen that MZC would be an excellent material for optimizing AP decomposition and would supply an idea for the development of new catalyst materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mingrui Wang,Guanghui Zhang,Jie Zhu,Wenhui Li,Jianyang Wang,Kai Bian,Yi Liu,Fanshu Ding,Chunshan Song,Xinwen Guo
Unraveling the correlation between the structure of the active sites and the reaction pathway is of utmost importance to designing selective catalysts for efficient conversion of greenhouse gas CO 2 . In this contribution, the tunable selectivity of CO 2 hydrogenation to CO or CH 4 is achieved in response to the regulation of valance state of active cobalt species. We combined multiple in situ spectroscopic characterizations to show that the small CoO particles highly dispersed in the mesopores and interacted with SBA-15 support prefer to keep the oxidized state (+2). These CoO species is stable in bulk and the surface is partially reduced under the reactive conditions. More CoO sites exposed in this catalyst lead to the higher performance of reverse water gas shift reaction, whereas more metallic cobalt sites derived from the large CoO particles on regular SiO 2 mainly promote CO 2 methanation. In situ FT-IR experiments demonstrated that adsorbed formate dominates on CoO and serves as the key intermediate for the formation of CO, while the adsorbed carboxylate intermediate observed on Co 0 site is dissociated into adsorbed CO and then further hydrogenated to CH 4 . Stronger CO and H 2 adsorption and activation on Co 0 sites lead to the high CH 4 selectivity, whereas weakly bonded CO prefers to desorb from CoO site, resulting in the high CO selectivity. This work discloses the tunable selectivity and offers an opportunity for rational design of efficient cobalt catalysts aiming for selective CO 2 hydrogenation.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
C-Journal of Carbon Research
·
2024
·Vol. 10
·期 1
·12
·
IF 3.9
Chengwei Zhou,Fan Wu,Yonggong Tang,Boyuan Chai,Jiaxin Liang,Jiangang Han,Weinan Xing,Yudong Huang,Guangyu Wu
Photocatalytic carbon dioxide conversion is a promising method for generating carbon fuels, in which the most important thing is to adjust the catalyst material to improve the photocatalytic efficiency and selectivity to conversion products, but it is still very challenging. In order to enhance the efficiency of CO2photoreduction, it is important to develop an appropriate photocatalyst. The present study focuses on developing a simple and effective hydrothermal reaction treatment to improve the catalytic efficiency of transition metal cobalt (Co) and organophosphonates. Photoexcited charge carriers are separated and transferred efficiently during this treatment, which enhances CO2chemisorption. Under visible light exposure, the best performing catalyst, CoP-4, showed 2.4 times higher activity than Co3O4(19.90 μmol h−1g−1) for reducing CO2into CO, with rates up to 47.16 μmol h−1g−1. This approach provides a viable route to enhancing the efficiency of CO2photoreduction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yan Dong,Sheng Liu,Wenjing Deng,Hao Zhang,Guangyi Liu,Xiaolei Wang
Heteroatom doping is a possible way to regulate the catalytic capability of electrocatalysts for hydrogen evolution reaction (HER). This work focuses on the development of bimetallic Cobalt-Iron sulfide ultrathin nanosheets supported on the graphitic carbon nitride (g-C 3 N 4 ) catalyst as efficient HER electrocatalysts (CoS 2 /FeS 2 /CN) with good stability at wide pH value. The ultrathin nanosheet exposes more active sites and enhances the catalyst activity. Electrochemical experiments demonstrate that adding g-C 3 N 4 and Fe to CoS 2 increases its catalytic activity and stability. Furthermore, g-C 3 N 4 and Fe co-doped with CoS 2 can modulate electronic structures on the interface. The CoS 2 /FeS 2 /CN exhibits outstanding HER performance, reaching a current density of 10 mA cm −2 with overpotentials of only 76.5 mV in an acidic solution and 175.6 mV in an alkaline solution. It also demonstrates exceptional durability, superior to commercial platinum/carbon catalysts. This work introduces a promising approach for designing low-cost, high-performance HER electrocatalysts with a wide pH range.
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
MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-9
·
IF 5.833
Lü Haitao,Wang Hao,Yang Lili,Zhou Yan,Xu Lixiao,Hui Ni,Wang Dongwei
The conducting polymer polypyrrole nanocones wrapped by metal cobalt (Co/PPy) are a promising platform for the detection of sodium nitrite, which can be obtained by an electrochemical deposition technique under a mild condition. Co/PPy nanocone arrays combined the high conductivity and large specific surface area of PPy nanocones with the redox properties of metal cobalt, and their 3D structure can provide more active sites for nitrite detection. Owing to the microstructure and excellent electrical properties of the nanocomposite, Co/PPy nanocone arrays were convenient to construct a high-performance nitrite sensor. The microscopic morphology and composition of Co/PPy nanocone arrays were characterized by SEM, FT-IR, XPS, and XRD, and their electrochemical performances were also investigated. The experimental results showed that Co/PPy nanocones exhibited excellent performance for nitrite determination. The sensors were used for the determination of nitrite in pickled Chinese cabbage and water samples, and the results were consistent with those of spectrophotometry. Hence, the synthesized Co/PPy nanocone arrays have a broad application prospect in food safety, environmental protection, and industrial manufacturing. Graphical abstract
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jing Mei,Fujun Wu,Yangtan Qiu,Jinlu Han,Fenghua Zheng,Yahao Li,Youguo Huang,Kui Liu,Hongqiang Wang,Qingyu Li,Juantao Jiang
Developing highly active, stable, and cost-effective electrocatalysts is crucial for advancing electrochemical energy conversion technologies. Herein, a one-step simultaneous electrochemical exfoliation and intercalation strategy was employed to in-situ synthesize metallic cobalt-intercalated graphene intercalation compounds (Co-GIC) in an aqueous sodium hexanitrocobaltate solution. [Co(NO 2 ) 6 ] 3− anions played a dual role in promoting graphite exfoliation into graphene and serving as a cobalt source. During the process, Co ligands were first intercalated into the graphite anode, subsequently oxidized to Co 2+ , and finally reduced to metallic Co at the cathode. After nitrogen doping, the resulting metallic Co-intercalated N-doped graphene intercalation compounds (Co-N-GIC) formed a unique sandwiched electrocatalytic structure. The Co-N-GIC catalyst demonstrated excellent oxygen reduction reaction (ORR) performance in alkaline media, achieving a half-wave potential of 0.834 V vs. RHE and an electron transfer number of approximately 3.91, indicating a favorable four-electron pathway. In addition, it exhibited superior methanol tolerance and long-term durability compared to commercial Pt/C catalysts. Moreover, the Co-N-GIC catalyst delivered outstanding rechargeable Zn–air battery performance, achieving a peak power density of 248.2 mW·cm −2 and excellent cycling stability over 333 h, both of which surpassed those of commercial Pt/C. This novel one-step electrochemical synthesis strategy offers new possibilities for the preparation of graphene intercalation compound-based Co-N-C catalyst in aqueous electrolyte, presenting significant potential for energy conversion applications.
研究领域:
电化学
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jin Song,Fenglong Wu
The concentration of photogenerated electrons on support surface has a significant impact on the photocatalytic performance of the corresponding catalyst. Herein, the CeO 2 -based homojunction support consisted of quantum dots/nanorods (QDs/NRs) was fabricated by two-step calcination with assistance of KCI and NaCl. Based on CeO 2 -QDs/NRs support, the Co-based catalyst exhibited excellent catalytic performance for photocatalytic hydrogen evolution from Ammonia Borane (NH 3 BH 3 ). The catalysts exhibited the highest activity with TOF 96.15 min −1 under optimized conditions, which was significantly improved compared Co/CeO 2 NRs (68.5 min −1 ). Detailed structure characterizations revealed that the QDs with size range from 2 to 5 nm grow on the surface of NRs, which had capacity to transfer more photogenerated electrons from the bulk to surface compared with pristine CeO 2 NRs. Meanwhile, work function was upshifted from CeO 2 NRs to CeO 2 -QDs/NRs. The synergy of two factors drove more electrons transfer from CeO 2 -QDs/NRs to active metal Co, accelerating the adsorption and activation of NH 3 BH 3 . In addition, the forming mechanization QDs by inducing the morphological evolution of CeO 2 nanoparticles was also investigated. This work not only provides efficient photocatalyst for H 2 evolution from NH 3 BH 3 but also provides new insights into the design and preparation efficient QDs-based homojunction catalyst.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Kaixin Zhang,Zimu Li,Yeqiang Wang,Dajun Cui,Jiangxin Wang,Kuanhong Mei,Minmin Liu,Haoyang Dong,Yiman Zhang,Juan Zhang,Weiguo Xu,Shuo Li
The employment of Co-based cocatalysts in BiVO4 (BVO) photoanodes is still suffering from inefficient hole transfer to active sites and sluggish charge kinetic processes. To address this issue, we designed a hierarchical dual-shell Co@Co3O4@NC (Co-DS) cocatalyst synthesized via the controlled pyrolysis of CoCo Prussian blue analogs under micro-oxygen conditions. The designed hierarchical structure consists of a graphitic carbon shell that encases the Co3O4 interlayer, which is abundant in OER-active sites, coupled with a metallic Co core that enhances hole accumulation and charge transfer across interfaces. The optimized Mo-BVO/Co-DS photoanode achieves a photocurrent density of 4.95 mA/cm2 at 1.23 VRHE, representing a 129% enhancement over pristine BVO (2.16 mA/cm2). This work provides fundamental insights into the design principles of metal-oxide-based cocatalysts for overcoming efficiency limitations in photochemical water oxidation.
研究领域:
材料科学
·
纳米技术
·
电化学
·
可再生能源
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2023
·
IF 5.1
Yujie Yan,Bo Jin,Rufang Peng
Biomass chitosan (CS) was used as a template, graphitic phase carbon nitride (g-C 3 N 4 ) with high nitrogen content and certain catalytic activity was used as a dopant, and nano-transition metal cobalt (Co) was used as a catalytic center point. The carbon aerogel (C (CS)/g-C 3 N 4 /Co) with a three-dimensional network-like structure was prepared by assembling the three materials through experimental operations such as freeze-drying and high-temperature carbonization. It was demonstrated by scanning and transmission characterization that the CS in the carbon aerogel could provide more active sites for the cobalt nanoparticles, and the doping of graphite-phase carbon nitride as a template dispersed the cobalt nanoparticles and changed the conductivity of the CS. To investigate the catalytic effect of carbon aerogel on ammonium perchlorate (AP), it was investigated by differential thermal analyzer and TG thermal analysis. This carbon aerogel was very effective in catalyzing AP, and the 10 wt% content of the catalyst reduced the AP pyrolysis peak from 703.9 to 595.5 K. And to further investigate the synergistic effect of the three materials, further carbon aerogels such as C (CS)/Co, g-C 3 N 4 /Co were prepared and applied to catalyze AP, and the same ratio reduced the AP pyrolysis peak by 98.1 °C and 97.7 °C. This result indicates a synergistic effect of the assembly of the three materials.
研究领域:
材料科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2025
·
IF 3.9
Lu Qing Shan Xiao,Shuo Ma,Chun Li Li,Hao Li
Cyclohexanol is an important intermediate in the chemical industry and the synthesis of cyclohexanol from phenol by hydrogenation is a green and efficient process. In this paper, hollow carbon sphere nanoreactors ( [email protected] , T: temperature) with tunable microenvironment were synthesized by adjusting the calcination temperature using soft template method. The characterization analysis demonstrated that the calcination temperature could adjust the defect density and pore structure of the catalyst. When combined with experimental results and mechanistic studies, hydrogen and phenol were found to diffuse through multistage orifices into the cavities of the catalysts with enhanced mass transfer efficiency, and high defect density and highly dispersed cobalt nanoparticles were found to promote the activation and reaction of hydrogen and phenol. The [email protected] catalyst shows significant catalytic activity at 140 °C for 1h with 88.9% phenol conversion and 99.9% cyclohexanol selectivity. The good reaction activity of [email protected] can be attributed to the catalyst's high defect density (I D /I G =2.77), substantial metal dispersion (45.67%), a specific surface area of 588 m²/g, and an average pore size of 3.53 nm. Concurrently, [email protected] demonstrated remarkable universality in catalyzing the hydrogenation of a diverse array of lignin-derived monomers and dimers.
研究领域:
化学工程
·
催化化学
·
纳米材料
·
绿色化学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Qiuyao Jiao,Yan Liu,Ran Yu,Lei Li
For supported heterogeneous catalyst, metal-support interaction (MSI) is very important factors for catalytic performance. Commercial γ-alumina was reduced with hydrogen in advance, providing strong anchoring sites for metal (metal oxide) species. This research demonstrates the use of pre-reduced alumina as catalyst carrier to anchor metal Co species in FTS compared with unreduced one. The defective alumina supported catalyst displayed a supeior performance. The Co/RAl2O3-550 catalyst showed surprisingly high CO conversion of 56.0%, C5+ hydrocarbons selectivity of 93.2%, and a low methane selectivity of 2.7% at a remarkable high activity (CTY = 1.1 × 10-5 molCO gCo-1 s−1). It revealed the strong reduction of alumina generated more defective sites, which was strongly anchored with metal cobalt species under MSI. Besides, the reduction of alumina also boosted the number of surface L-acidity, promoting the CO absorption rate through CO dissociation. These results reveal the unique property of defective Al2O3 supported cobalt catalysts, and provide a practical strategy to explore stable and efficient FTS catalysts.
研究领域:
催化化学
·
材料科学
·
化学工程
·
表面化学
✓ 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）