CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cong Geng,Peng Wei,Huamei Chen,Haichao Liu,Shenshen Zheng,Haobin Wang,Yahong Xie
Carbon-based perovskite solar cells (C-PSCs) facilitate modularization and commercialization due to their excellent thermal stability and low cost. However, C-PSCs show the poor performance that charge carrier extraction by the carbon electrode alone is not as efficient as in the case of conventional hole transport materials (HTMs) based PSCs. In this work, an inorganic hole buffer layer of nitrogen-doped carbon/Co 3 O 4 (Co 3 O 4 @NC) nanoparticles derived from MOFs is introduced to adjust energy alignment and passivate perovskite (PSK) grain boundaries (GBs). Moreover, a simple processing method on the Co 3 O 4 @NC nanoparticles manipulated by controllable ultraviolet/ozone (UVO) treatment is employed, to further improve the interfacial performance of MAPbI 3 /Co 3 O 4 @NC and reduce the hysteresis. Through interface engineering, it is found that Co 3 O 4 @NC inorganic hole buffer layer effectively promotes photo‐generated charge separation and extraction, and suppresses charge recombination at the MAPbI 3 /Carbon electrode (CE) interface, resulting in improved photovoltaic performance. Consequently, the optimal C-PSCs without encapsulation achieved a maximum PCE of 14.63%, which is 22.3% more efficient than the pristine device (11.96%), and exhibited outstanding long-term stability.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiao Wang,Wenjing Liu,Tongkai Wang,Yuli Zhao,Gang Zhao,Shouwei Zhang,Jinzhao Huang,Xijin Xu
Amorphous/crystalline heterophase composites possess expansive reaction interfaces and abundant oxygen vacancy defects, providing novel electron-hole transmittal mode and significantly facilitating the surface adsorptions and redox reactions . Herein, galvanic replacement reaction (GRR) was used to construct amorphous SnO x / crystalline Co 3 O 4 multishell heterostructures . Characterizations indicated the continuous transition from Co 3 O 4 to amorphous SnO x on each shell, generating abundant amorphous/crystalline interfaces. Moreover, the oxygen vacancy defects concentration also increased with the GRR proceeding. Benefitting from theses, the surface oxygen adsorption was facilitated due to more surface active sites and enhanced carrier densities. However, with further increasing the reaction time, decreased adsorbed oxygen concentrations were detected, owning to the unexpected high potential barriers induced by excessive heterojunctions . Gas sensing results showed that the sensors with 1 h GRR exhibited the best sensing performance with an exceptional response (1268) to 100 ppm formaldehyde gas and low detection limit (21 ppb) at low working temperatures (100 °C). The synergistic effects between oxygen vacancy defects and amorphous/crystalline heterophase interfaces on the superior gas sensing behaviors were also investigated. Most importantly, results presented will shed lights on the rational design of highly sensitive gas sensors through amorphous/crystalline interfaces constructions.
研究领域:
材料科学
·
传感器技术
·
表面化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In this study, porous sheet-like nanostructured Co 3 O 4 -CuO-CuOHF composites with great n-butanol sensing properties were synthesized by the biotemplate method and hydrothermal method . The effect of various contents of Co 3 O 4 -CuO-CuOHF sensor performance was systematically investigated, in which the best performance was achieved for the composite with 0.03 g Co 3 O 4 addition. The response of the best content Co 3 O 4 -CuO-CuOHF composite sensor to 100 ppm n-butanol at 180 ℃ is 120, which is 8 times higher than that of the CuO-CuOHF sensor. The composite sensor has excellent selectivity for n-butanol and responds 3.75–25 times higher to n-butanol than other target gases. It is detectable up to 500 ppb n-butanol and has potential promise for low concentration detection. Furthermore, it has outstanding stability and resistance to humidity. The gas sensing mechanism was analyzed by UV–visible diffuse reflectance spectroscopy, EPR oxygen vacancies and X-ray photoelectron spectroscopy, which indicated that the abundant oxygen vacancies , the physical adsorption of polar hydroxyl bonds, the electronegative fluorine substitution and the special microstructure of the composite contributed to its gas-sensitive performance.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
表面化学
·
功能材料
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Jingting He,Kun Yang,Guisheng Qi,Zonglin Yi,Yujing Guo,Qiang Guo
Electrocatalytic nitrate reduction reaction (NO 3 RR) represents a promising approach for regulating the global nitrogen cycle and serves as a crucial complementary method for ammonia synthesis. However, NO 3 RR is a complex reduction process involving the transfer of eight electrons and nine protons. Therefore, it is difficult for catalysts with a single catalytic site to maintain an advantage throughout the NO 3 RR process. Consequently, the fabrication of catalysts with synergistic effects to achieve both high efficiency and selectivity remains a formidable challenge. Herein, a simple precipitation-calcination process was employed to successfully introduce boron (B) and nickel (Ni) elements into Co 3 O 4 (B/Ni-Co 3 O 4 ) simultaneously. Impressively, the as-prepared B/Ni-Co 3 O 4 catalyst exhibited a remarkable NH 3 yield of 17.2 mg·h −1 ·mg cat −1 and a high FE of 97.2 % at −0.5 V relative to the reversible hydrogen electrode (RHE). Density functional theory (DFT) computations uncovered a cooperative effect between B and Ni dopants, specifically: B doping exhibited appreciable efficacy in NO 3 – adsorption, and the Ni dopant showed notable activity in promoting the conversion of NO 2 − . Further DFT calculations identified the *NO → *NOH step as rate-determining and revealed that B-Ni co-doping diminishes its thermodynamic energy barrier. Concurrently, experimental measurements showed that such co-doping lowers the onset potential to −0.06 V vs. RHE. This dual doping strategy significantly accelerates the electroreduction of NO 3 − to NH 3 .
研究领域:
电化学
·
催化化学
·
材料科学
·
环境化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Jing Deng,Mengyuan Xu,Shanfang Feng,Chungen Qiu,Xueyan Li,Jun Li
Ordered mesoporous Co 3 O 4 (OM-Co 3 O 4 ) displayed superior performance for peroxymonosulfate (PMS) activation. While, the separation and recovery of the catalyst after catalytic oxidation needed tedious operation. In this study, the as-synthesized iron-doped OM-Co 3 O 4 not only inherited the merits of ordered mesoporous materials such as high surface area and abundant mesoporous structure, but endowed them with ferromagnetism , facilitating their separation from the solution. Compared with spinel Co 3 O 4 , iron-doped OM-Co 3 O 4 showed superior catalytic activity , wide application scope, excellent reusability and long-term stability, fully validated that iron-doped OM-Co 3 O 4 can be a promising heterogeneous PMS activator for environmental application. High catalyst loading and PMS concentration were both beneficial to CIP degradation. The best CIP degradation occurred under base conditions. Chlorine and bicarbonate presented completely opposite two-side effects. The mechanism of CIP degradation was primarily attributed to SO 4 − and OH to a lesser extent. The rapid redox cycles of M 2+ /M 3+ (M = Co, Fe) and O 2− /O 2 ensured the continuous generation of reactive oxygen species and the efficient degradation of CIP. The cleavage of piperazine ring, hydroxylation and defluorination were identified as the main oxidation pathways for CIP degradation in iron-doped OM-Co 3 O 4 activated PMS system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Yong Tang,Jianwei Zhao,Yi Li,Yujing Wang,Guangqiu Zhang,Yihang Zhao,Lirong Qin
In this study, we synthesized Co 3 O 4 :Ce 3+ /Mn 2+ granular nanowires on nickel foam as an electrode for supercapacitors using a hydrothermal method. The introduction of Mn 2+ ions into the Co 3 O 4 :Ce 3+ electrode material increased the oxygen vacancy and Co 2+ /Co 3+ ratio of the material, resulting in an increase in electrical conductivity and electrochemical performance. In the three-electrode system, the Co 3 O 4 :Ce 3+ /Mn 2+ electrode achieved a specific capacitance of 2527.8 F/g at 1 A/g, which is 65 % higher than that without Mn 2+ ions. A symmetric supercapacitor (SSC) device was prepared by assembling two electrode components. At a current density of 1 A/g, the SSC device achieved a specific capacitance of 467.0 F/g, delivering a maximum energy density of 233.5 Wh/kg (1 A/g) and a maximum power density of 36,600 W/kg (20 A/g), coupled with outstanding cycling stability. These results indicate that the Co 3 O 4 :Ce 3+ /Mn 2+ nanowires coated nickel foam electrode holds considerable promise for applications in energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
电化学储能
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shi-Yuan Zhang,Hong-Lin Zhu,Yue-Qing Zheng
Transition metal oxides with hierarchical structures that grow on conductive substrates directly, which have been considered as promising catalysts for electrochemical catalysis. In this study, we used a stepwise synthesis method to prepare CuO nanoflake @Co 3 O 4 nanowire composite nano-arrays (denote as CuO/Co 3 O 4 composite), which show an excellent electrochemical performance. In the oxygen evolution reaction (OER), the CuO/Co 3 O 4 composite shows lower overpotential of 450 mV at the current density of 50 mA cm −2 and a smaller Tafel slope of 42 mV dec −1 in KOH solution (1 M, pH = 13.7). In the electrocatalytic CO 2 reduction reaction, the prepared CuO/Co 3 O 4 composite showed better CO selectivity in KHCO 3 aqueous solution (0.1 M, CO 2 saturated), the corresponding Faradaic efficiency of CO product reached 35.4%, and the product ratio of H 2 to CO was controlled by changing the potential values. The synthesis strategy reported here opens a way for designing high-performance electrodes for electrochemical catalysis and also provides new ideas for the construction of overall reaction (CO 2 + H 2 O → CO + O 2 ).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiaoyu Zheng,Lin Xing,Xuemei Zhou,Yulian Tang,Zhen Liu,Xueting Zhang,Lei Hu,Zhengquan Yan
To monitor toxic NO 2 − and S 2− conveniently and effectively in 100% aqueous, nano CeO 2 was identified and modified first onto 2-dimensional Co 3 O 4 substrate (CeO 2 @2D Co 3 O 4 ) under microwave-assisted conditions at 140 °C. The obtained CeO 2 @2D Co 3 O 4 expressed excellent stability and superior oxidase-mimic activity with a wide temperature range from 20 to 60 °C. Under the optimized conditions (pH 4.0, 25 °C, 0.07 mM TMB), CeO 2 @2D Co 3 O 4 could accelerate the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue oxidation (oxTMB) within 12 min at room temperature , whose Michaelis constant ( K m ) and maximal reaction rate ( v max ) were 0.017 mmol/L and 2.17 × 10 −7 mol/L·s –1 respectively. Especially, both NO 2 − and S 2− could exclusively make the blue CeO 2 @2D Co 3 O 4 -TMB system into colorless and green respectively, expressing significant visibility. When applied for visual detection of NO 2 − and S 2− in real water, soil, drink and food samples, the recoveries were 97.6~104.6% and 97.5~104.1% with low detection limits of 3.26 × 10 −9 mol/L and 6.65 × 10 −8 mol/L (S/N = 3), far below the maxima in drinking water permitted by World Health Organization (WHO). The strengthened oxidase-mimic activity of CeO 2 @2D Co 3 O 4 and its different recognition mechanisms to NO 2 − and S 2− were studied in detail.
研究领域:
环境科学
·
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xiang Xiao,Mingyong Wang,Jiguo Tu,Yiwa Luo,Shuqiang Jiao
Because of the unprecedented development and popularization of portable electronics, electric vehicles, and smart grid, rechargeable batteries have become one of the hottest topics within worldwide research for the past decade. Among all of the proposed nonlithium-based battery systems, rechargeable aluminum-ion batteries (RAIBs) are considered as a promising candidate due to aluminum’s abundance and safety. Naturally, exploring compatible and high-performance cathode materials for RAIBs becomes a key issue for pushing RAIBs from lab-level to industrialization. In this work, we report a novel high-performance RAIB system using MOF-derived Co3O4@MWCNTs polyhedron composite as cathode. The well-defined morphology of MOF-derived Co3O4 and enhancement brought by MWCNTs allow Co3O4@MWCNTs polyhedrons to deliver an initial discharge capacity of ca. 266.3 mAh g–1, and the reversible specific capacity can reach 125 mAh g–1 at 100 mA g–1 over 150 cycles. The energy storage mechanism has been verified to be a reversible valence-change reaction between Co3O4 and Co. These findings can enlighten future research regrading MOF derivatives as advanced cathode materials for RAIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 11
·期 3
·1111-1122
·
IF 7.233
Chunmei Li,Zhihui Chen,Weiyong Yuan,Qing-Hua Xu,Chang Ming Li
Photoelectrochemical (PEC) water splitting represents a promising strategy to convert solar energy into chemical energy in the form of hydrogen, but its performance is severely limited by the sluggish water oxidation reaction. Herein, for the first time, we report the direct assembly of an ultrathin, uniform, and dense layer of Co3O4 on wormlike nanostructured hematite (WN-α-Fe2O3) to form a large-area and high-density WN-α-Fe2O3@Co3O4 core–shell nanoarray via in situ hydrothermal growth followed by calcination, in which the electrostatic force between WN-α-Fe2O3 and the reactants, pH- and temperature-controlled structures of WN-α-Fe2O3, and ultralow nucleation rate of Co3O4 precursors all play critical roles. The obtained heteronanostructure array shows a photocurrent density of 3.48 mA cm−2, which is 4.05 times higher than that of pristine WN-α-Fe2O3 (0.86 mA cm−2), an onset potential of ∼0.62 V, 60 mV lower than that of α-Fe2O3 (∼0.68 V), and a photoconversion efficiency of 0.55%, 3.93 times higher than that of WN-α-Fe2O3 (0.14%). This is among the highest performances reported for Fe2O3-based photoanodes for water splitting. It is discovered that the Co3O4 shells can significantly enhance the charge separation, accelerate the charge transport and transfer, and reduce the charge transfer resistance from the photoelectrode to the electrolyte for a fast water oxidation reaction, thereby greatly promoting the PEC water oxidation performance of pristine WN-α-Fe2O3. This work not only creates a novel low-cost and Earth-abundant WN-α-Fe2O3@Co3O4 photoelectrode with superior PEC water oxidation performance and provides scientific insights into the enhancement mechanism, but also offers a general strategy for the in situ growth of water oxidation catalysts on various photoelectrodes with 3-D complex geometries for PEC water splitting.
研究领域:
材料科学
·
能源转换与存储
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Chen Li,Jijun Xiong,Caidong Zheng,Jiang Zhao
Precise acquisition of the blood glucose level is one of the most critical indicators for the prevention and treatment of diabetes. Compared with the high cost and instability of enzyme-based glucose sensors, the development of low-cost, high-sensitivity, and fast-response nonenzymatic glucose sensors is imperative. Herein, bulk Co3O4-embedded N-doped laser-induced graphene (Co3O4@NLIG) powder is in situ fabricated through a high-efficiency and simple laser-scribing technique and successfully made into a screen-printing paste for screen-printed electrodes (SPEs), followed by use as an enzyme-free glucose sensor. The electrocatalytic results show that the as-prepared Co3O4@NLIG/SPE glucose sensor has a high sensitivity of 143 μA mM–1 cm–2, a broad linear detection range of 1 μM to 11 mM, an ultralow detection limit of 0.48 μM, and a rapid response time of <1 s. The as-prepared sensor also has prominent reproducibility, stability, and immunity to interference. Furthermore, the glucose-sensing mechanism of the sensor is profoundly explored. Such an outstanding electrocatalytic performance endows the Co3O4@NLIG/SPE nonenzymatic glucose sensor with potential applications in blood glucose monitoring and diagnosis.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Yuhui Sun,Junnan Han,Min Wang,Zhihuan Li,Zijie Lin,Shimin Chen,Zehui Zhang,Shijie Yang,Linwei Yu,Zhongwei Yu,Guangbin Zhang,Wei Li,Songke Mao,Hucheng Song,Jun Xu,Kunji Chen
The global energy crisis and unsustainable reliance on fossil fuels make it particularly urgent to develop efficient renewable energy storage solutions. Aqueous zinc–air batteries (ZABs) have become extremely promising candidates due to their low cost, abundant surface resources, inherent safety, and high theoretical energy density. This study explores the feasibility of using seawater as an electrolyte for ZABs, with the aim to reduce costs and alleviate competition for limited freshwater resources. Research results indicate that ZABs using seawater electrolytes with varying salinities (1.4–10%) show good bifunctional catalytic performance in the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) with defect-driven Co3O4–MoS2 bifunctional catalysts, while maintaining strong catalytic activity and stability in nonextreme salinity environments. The assembled ZABs with defect-driven Co3O4–MoS2 bifunctional catalysts display a charge–discharge voltage difference of less than 1.1 V, can stably operate for more than 360 cycles at a current density of 5 mA/cm2, and exhibit strong tolerance to halogen ions, with performance comparable to that of batteries using conventional deionized water-based electrolytes. These findings underscore the feasibility of seawater-based ZABs, breaking through the limitations of traditional deionized water-based electrolytes and expanding the application prospects of aqueous ZABs in the realm of sustainable energy storage.
✓ 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）