Sustainable Energy & Fuels
·
2022
·Vol. 7
·期 2
·389-397
·
IF 6.813
Junwei Li,Yige Wang,Wenwei Liu,Zhenyi Liang,Chunlei Fan,Jinying Li,Shengxu Luo,Haoxiong Nan,Jia Yu
With the aggravation of the environmental pollution problem and the depletion of natural resources, hydrogen production based on water splitting technology has become an effective method to satisfy the increasing demand for renewable energy. It is vital to design high-efficiency and low-cost electrocatalysts for water splitting. Herein, an electrocatalyst (Co3O4–S/NF) with a surface-sulphurated nanowire array structure is controllably synthesized for catalysing the oxygen evolution reaction (OER) process. Co3O4–S/NF (1 : 0.5) exhibits the best OER activity with an overpotential of 297 mV at 100 mV cm−2, which is lower than the overpotential (331 mV) of commercial Ir/C/NF. Additionally, the water-splitting voltage of the Co3O4–S/NF//Pt/C/NF electrolyzer reaches 1.571 V at 20 mV cm−2, which is also better than that of conventional noble-metal electrocatalysts. Notably, Co3O4–S/NF//Pt/C/NF also shows excellent efficiency in seawater electrolysis. The voltage reaches 1.656 V in a simulated alkaline seawater electrolyte (1 M KOH + 0.5 M NaCl) and 1.722 V in an alkaline seawater electrolyte (1 M KOH in seawater). This work can provide a robust electrocatalyst design for water electrolysis.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jiaqi Chen,Lili Zhang,Jingwen Sun,Junwu Zhu,Xin Wang,Yongsheng Fu
Ingenious design of catalysts structure is vital for accelerating ammonium perchlorate (AP) thermal decomposition at lower temperature and accompanying with more heat release. In this work, a self-templated approach is adopted to construct hierarchical hollow double-shelled Co 3 O 4 using cobalt glycerate solid spheres as precursors. The structural transformation from the solid species to the hollow double-shelled Co 3 O 4 sphere is implemented by a solution growth combined with a subsequent calcination . The hierarchical hollow double-shelled morphology, large surface area and unique electronic structure endue Co 3 O 4 with enhanced catalytic performance for thermal decomposition of AP. The AP decomposition temperature is decreased to 318 °C and heat release is increased from 491 J g −1 to 1280 J g −1 .
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yingdong Wu,Yan Wang,Pei Zhu,Xiao Ye,Ruonan Liu,Wangfeng Cai
Effective controllable manufacturing oxygen vacancy and polypyrrole coating can optimize the capacitive and cyclic properties of Co 3 O 4 . Herein, composition of O v -Co 3 O 4 @PPy with Co 3 O 4 rich in oxygen vacancy defects and polypyrrole was synthesized using NaBH 4 reduction and chronoamperometry. O v -Co 3 O 4 was synthesized while regulating the concentration of the reducing agent NaBH 4 solution, and then O v -Co 3 O 4 @PPy was synthesized by electrodeposition of PPy. The specific capacitance of O v -Co 3 O 4 @PPy formed at an optimal NaBH 4 concentration and electrodeposition time was about three times that of Co 3 O 4 without reduction treatment and unwrapped PPy. The capacitance retention rate of O v -Co 3 O 4 @PPy was close to 80.5% after 5000 cycles. In addition, O v -Co 3 O 4 @PPy//AC asymmetric supercapacitor was assembled with the as-prepared O v -Co 3 O 4 @PPy as the positive electrode material and activated carbon as the negative electrode, which yielded specific energy density up to 74.55 Wh kg −1 at 850 W kg −1 power density and a capacitance retention rate close to 110% after 10,000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xinzhe Shi,Rongrong Deng,Qibo Zhang
Co 3 O 4 -based electrode materials exhibit great potential for utilization as efficient catalysts for the oxygen evolution reaction (OER), especially in acidic media. However, enhancing their catalytic stability remains a crucial challenge. Herein, we present a facile electrochemical deposition approach coupled with calcination treatment to achieve in-situ growth of active Co 3 O 4 films from a deep eutectic solvent with water as the modifier. The incorporation of water optimizes the structure of fabricated Co 3 O 4 by increasing oxygen vacancies and elevating the Co 2+ /Co 3+ ratio, enabling it to sustain the OER in 0.5 M H 2 SO 4 . Impressively, the catalyst grown on Pt/Ti substrate exhibits stable operation over 125 h at 10 mA cm −2 . Attenuated total reflection-fourier transform infrared (ATR-FTIR) spectroscopy reveals that OER on the defect-rich Co 3 O 4 catalyst occurs through both lattice oxygen mediated mechanism (LOM) and adsorption evolution mechanism (AEM).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jinhui Wang,Yuting Li,Quanhui Hou,Peng Jiang,Zhao Ding,Yonglian Xiong
Magnesium-based materials are favored by researchers because of their high hydrogen storage capacity, but they cannot be put to daily use because of their more demanding reaction conditions. Recently, the method to improve the hydrogen storage performance of MgH 2 by catalyst doping has been widely investigated. In this paper, Co 3 O 4 catalysts were prepared by homogeneous precipitation method. It was demonstrated that the Co 3 O 4 catalyst could effectively improve the hydrogen storage performance of MgH 2 . According to the experimental results, the dehydrogenation onset temperature of the MgH 2 +15 wt% Co 3 O 4 composite was about 200 °C, which was about 130 °C lower than that of pure MgH 2 , and the amount of dehydrogenation was 6.26 wt%. The dehydrogenation activation energy of the MgH 2 +15 wt% Co 3 O 4 composite was reduced to 89.13 kJ/mol, which was about 45.7% lower than that of pure MgH 2 . After complete dehydrogenation, the composites started to absorb hydrogen at 50 °C with 6.2 wt%, while the activation energy of reabsorption was also reduced to 47.97 kJ/mol. After 10 cycles of MgH 2 +15 wt% Co 3 O 4 composites, the hydrogen storage capacity of MgH 2 could still be maintained at 99%, which indicated that it had good cycling stability. It was confirmed by various characterizations that Co 3 O 4 was uniformly distributed on the MgH 2 matrix after ball milling . After the first reaction, Co 3 O 4 was converted to CoO, which was uniformly attached to the Mg/MgH 2 surface and stabilized during the cycling process, continuing to provide active sites for hydrogen.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Ping Yang,Yunshi Liu
Co 3 O 4 nanochain and Co 3 O 4 /CeO 2 heterostructures were prepared via an electrospinning process and subsequent calcination . The formation and shape evolution from Co 3 O 4 nanochains to Co 3 O 4 /CeO 2 composite nanobelts were investigated, suggesting that both components and preparation parameters play important roles in resulted morphology and properties. Homogeneous Co 3 O 4 /CeO 2 junctions in belt samples were formed towards enhanced catalysis performance. Well-dispersed Au nanoparticles were deposited on Co 3 O 4 /CeO 2 composite nanostructures or doped inside through reduction and direct calcination route method, respectively. The loading of Au nanoparticles significantly enhanced catalytic performance with onset CO conversion at 100 °C and resulted in CO conversion over at 127 °C.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 11
·5342-5350
·
IF 8.867
Haoran Du,Chao Yuan,Kuangfu Huang,Wenhai Wang,Kai Zhang,Baoyou Geng
A mesoporous bowknot-like Co3O4 material has been synthesized through a facile hydrothermal method, using cobalt nitrate as the cobalt source, urea as the precipitator and gelatin as the guide agent, followed by calcination at 600 °C in air. Morphology characterization reveals that this bowknot-like Co3O4 material possesses a mesoporous structure consisting of nanoparticles. Electrochemical experiments illustrate that the mesoporous bowknot-like Co3O4 anode material exhibits a superior first and 100th reversible specific capacity of 1427.9 mA h g−1 and 1388.8 mA h g−1 at 0.2C, respectively. This material also delivers a high charge capacity of 751.3 mA h g−1 after 150 cycles at 2C. The novel preparation method and satisfactory performance make the bowknot-like Co3O4 a good candidate as a high-performance anode material for use in Lithium-Ion Batteries (LIBs).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Micun Yun,Yifei Ma,Zhuo Cai,Haomin Ji,Jiemin Han,Mei Wang,Zhaomin Tong,Liantuan Xiao,Suotang Jia,Xuyuan Chen
A composite of Co 3 O 4 /holey graphene (Co 3 O 4 /HG) was prepared via a facile hydrothermal route, and was then processed into an electrode by an electrophoretic deposition process. Holey graphene (HG) wrapped Co 3 O 4 to form a 3D skeleton network, thereby providing high electrical conductivity , and the holes in HG could further shorten the electrolyte ion diffusion pathway. Therefore, by adjusting the mass ratio of Co 3 O 4 to HG, the Co 3 O 4 /HG composite afforded an enhanced capacitance of 2714 F g −1 (at a current density of 1 A g −1 ), which is 20 times higher than that of pure Co 3 O 4 . To further explore the practical applications of Co 3 O 4 /HG, a symmetric supercapacitor employing Co 3 O 4 /HG was fabricated. The supercapacitor functioned stably at potentials up to 1.2 V, with an enhanced energy density of 165 Wh kg −1 and a high power density of 0.6 kW kg −1 at 1 A g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Feng Zhou,Jiadong Chen,Yun Yang,Xiaofeng Ke,Xue Liu,Lijie Zhang,Jun Li,Huile Jin,Shun Wang,Ying Li,Chenliang Su
Development of Ru-based electrocatalysts for acidic oxygen evolution reaction without a trade-off between activity and durability remains challenging. Herein, we constructed Co 3 O 4 /RuO 2 heterojunctions anchored on carbon (Co 3 O 4 /RuO 2 -C) with a low Ru loading (2.74 wt%), in which strong coupled p-n junctions facilitated electron transfer from RuO 2 to Co 3 O 4 . The Co 3 O 4 /RuO 2 -C demonstrated a low overpotential of 170 mV at 10 mA cm −2 and long-term stability in 0.1 M HClO 4 due to its unique structure. The origin of its high performance in acidic OER was revealed by the combination of in-situ attenuated total reflection infrared and Raman tests. Concretely, oxygen generation for Co 3 O 4 /RuO 2 -C was dominated by the adsorbate evolution mechanism, and the introduction of Co 3 O 4 facilitated the redox of RuO 2 , generating active sites for OER. Theoretical calculations further substantiated that the Co 3 O 4 /RuO 2 heterojunctions possessed lower energy barriers for OER. This work provides a compelling synthesis route for effective and stable electrocatalysts for acidic OER.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Haochang Chen,Shunzhe Zhang,Hao Liu,Kaifeng Wang,Yujie Chen,Hua Li,Xiaobiao Zuo,Hezhou Liu
Cobalt tetraoxide (Co 3 O 4 ) is regarded as a promising anode material for Li-ion batteries owing to its high theoretical capacity (890 mAh g −1 ), simple preparation, and controllable morphology. Nanoengineering has been proven to be an effective method for producing high-performance electrode materials . However, systematic research on the influence of material dimensionality on battery performance is lacking. Herein, we prepared Co 3 O 4 with various dimensionalities (one-dimensional (1D) Co 3 O 4 nanorod (NR), two-dimensional (2D) Co 3 O 4 nanosheet (NS), three-dimensional (3D) Co 3 O 4 nanocluster (NC), and 3D Co 3 O 4 nanoflower (NF)) using a simple solvothermal heat treatment method, and their morphologies were controlled by varying the precipitator type and solvent composition . The 1D Co 3 O 4 NR and 3D samples (3D Co 3 O 4 NC and 3D Co 3 O 4 NF) exhibited poor cyclic and rate performances, respectively, while the 2D Co 3 O 4 NS exhibited the best electrochemical performance . The mechanism analysis revealed that the cyclic stability and rate performance of the Co 3 O 4 nanostructures are closely related to their intrinsic stability and interfacial contact performance, respectively, and the 2D thin-sheet structure can achieve an optimal balance between the two, resulting in the best performance. This work presents a comprehensive study on the effect of dimensionality on the electrochemical performance of Co 3 O 4 anodes, providing a new concept for the nanostructure design of conversion-type materials.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhen Peng,Xiaojie Yin,Tianli Han,Jiawei Long,Jinpei Hei,Jinyun Liu
High energy-storage Li-ion battery needs a high-capacity anode. However, current graphite-based anode doesn’t meet this requirement, thus developing high performance anode materials is highly needed and significant. Here, we provide a rational engineering of a multi-layered hollow structure combining with surface coating of polyamine (PANI) layer, forming a Co 3 O 4 /NiO@PANI hybrid using for Li-ion battery anode. PANI is able to effectively improve the conductivity of active materials; besides, PANI is flexible, which can prevent the collapse of the structure caused by volume-expansion during charge and discharge. The multi-layered morphology improves the utilization ratio of voids inside the conventional hollow structured materials, which is significant to improve capacity in practical applications. The Co 3 O 4 /NiO@PANI hybrid-based anode shows a capacity of 1049 mAh g −1 along with a Coulombic efficiency of 99.3% after 100 cycles of 0.2 A g −1 . Rate-performance of Co 3 O 4 /NiO@PANI exceeds that of the bare Co 3 O 4 /NiO. It is believed that the hierarchical structure combining multi-layered hollow morphology with surface coating of conductive polymer presented here would find broad applications for developing high-performance energy-storage hybrids.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shasha Li,Xunzhao Qiu,Xiaowei An,Enze Li,Xueyan Li,Guiru Wang,Peng Li,Caixia Shi,Yiming Liu,Guoqing Guan
Metal-organic frameworks (MOFs) derived spinel tricobalt tetroxide (Co 3 O 4 ) electrocatalysts incorporated with trifle Iridium (Ir) sites are in-situ grown on nickel foam (NF) substrate (Ir-Co 3 O 4 /NF) as effective anode for OER especially in near-pH-neutral seawater with high ability to suppress chlorine evolution reaction. Density functional theory (DFT) calculations indicate that the trifle Ir sites can be safeguarded in spinel Co 3 O 4 via structural-confinement and charge-redistribution so that the Ir and Co sites with their bridged electrophilic O ligands can serve as the active sites for boosting OER performance. As expected, a relatively low OER overpotential of 370 mV @ 10 mA cm −2 and it is achieved with at least 7 days durability under the current density of 100 mA cm −2 in near-pH-neutral simulated seawater with high selectivity toward OER. In same condition, a fabricated electrolyzer using it presents excellent electrocatalytic performance with a cell voltage of 2.11 V @ 100 mA cm −2 , strongly suggesting that the present electrolyzer has great promising for practical seawater electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）