JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Suhang Xun,Yan Xu,Jingjing He,Deli Jiang,Rong Yang,Di Li,Min Chen
Developing highly efficient and earth-abundant electrocatalysts for water oxidation is highly desirable for sustainable energy conversion applications. In this work, we designed and constructed a novel integrated ternary hybrid composed of CoO/Co 3 O 4 (CoO x ) nanoparticles supported on CoMoO 4 nanorods (CoO x /CoMoO 4 ) through a hydrothermal treatment of ZIF-67/CoMoO 4 followed by a thermal annealing. Benefiting from the enlarged surface areas, more active sites and fast charge transfer kinetics resulted from the interface between CoO x and CMO, the CoO x /CMO electrocatalyst manifests the excellent oxygen evolution reaction (OER) catalytic performance with a low overpotential of 253 mV at the current density of 10 mA cm −2 and high long-term durability, which is superior to those of most previously reported Co- or Mo-based oxides electrocatalysts. This work not only provides a highly efficient catalyst for OER but also sheds light on the fabrication of ternary Co-based hybrid electrocatalyst by using ZIF-67 as a precursor.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiabing Luo,Xingzhao Wang,Yufeng Gu,Dong Wang,Shutao Wang,Wenle Li,Yan Zhou,Jun Zhang
Hollow nanocages composed of heterostructures play an important role in oxygen evolution reaction (OER) due to their high electrocatalytic activity induced by the interfacial polarization within the interface of the heterostructure. In this work, ZIF-67 was used to synthesize Co 3 O 4 /CoMoO 4 hollow nanocages (Co 3 O 4 /CoMoO 4 HNC). Transmission electron microscopy (TEM) images verify that Co 3 O 4 /CoMoO 4 HNC was composed of Co 3 O 4 /CoMoO 4 heterostructures. X-ray photoelectron spectroscopic (XPS) characterizations show that the Mo 3d peaks of Co 3 O 4 /CoMoO 4 are located at lower binding energy compared with CoMoO 4 , indicating charge transfer between Co 3 O 4 and CoMoO 4 . The electrochemical studies show that Co 3 O 4 /CoMoO 4 HNC exhibited excellent OER activity in an alkaline medium with only 248 mV overpotential required to achieve a current density of 10 mA cm −2 . Co 3 O 4 /CoMoO 4 HNC was tested as the anode material in a homemade water-splitting device to produce oxygen. The Co 3 O 4 /CoMoO 4 HNC‖20 % Pt/C electrolytic cell shows equivalent performance to RuO 2 ‖20 % Pt/C cell at 50 °C. The excellent OER performance of Co 3 O 4 /CoMoO 4 HNC is attributed to the interfacial charge transfer between Co 3 O 4 and CoMoO 4 which promote the adsorption of OH − . Besides, the hollow nanocage structures provide a large surface area, leading to more active sites for OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongsheng Lu,Tiesen Liu,Jinyu Han,Jiankang Zhao,Hua Wang
Electroreduction of nitrate to ammonia, a potential route for producing ammonia, is still confronted with a great challenge on developing efficient electrocatalysts. In this work, a reduced yolk-shell Co-based oxides (R-Co 3 O 4 ) electrocatalyst with oxygen vacancy-rich Co 3 O 4 and CoO was designed for nitrate reduction . This catalyst presented a nearly 100 % Faradaic efficiency (FE) of ammonia in a low potential from −0.05 to −0.1 V vs. RHE, and a maximum ammonia production rate of 7.25 mg h −1 mg cat. -1 at −0.05 V vs. RHE in 0.1 M KOH + 1000 ppm KNO 3 electrolyte. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) pattern proved that the content of Co 2+ was dramatically increased in R-Co 3 O 4 . The kinetic correlation experiments and Operando Raman spectra preliminarily manifest that the potential limiting step is the reduction of adsorbed *NO 3 . The density functional theory (DFT) calculations consistently demonstrated that on both oxygen-rich Co 3 O 4 and CoO, the adsorption of key intermediates (*NO 3 , *NO and *NH) are greatly enhanced on the bridge site between two Co 2+ , boosting the nitrate reduction at low over-potential. This work is helpful to design the catalytic material with rich and low-valence sites towards electroreduction of nitrate to ammonia.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2022
·Vol. 34
·期 11
·1756-1762
·
IF 3.077
Zhang Kaiyue,Li Juan,Xiong Lulu,Sun Wei,Li Ming Chang
A hollow Co 3 O 4 turtle shell-like structure (HS−Co 3 O 4 ) was synthesized from ZIF-67 and further employed for the first time to electrochemically real-time monitor dopamine (DA) released from living cells. X-ray powder diffraction, electron microscopy, X-ray photoelectron spectroscopy, electrochemical methods were used to study its physical and chemical properties and electrocatalytic behaviours. The as-prepared DA HS−Co 3 O 4 sensor accomplishes an outstanding limit of detection (LOD) of 3 nM, a broad linear range of 0.01–360 μM, good stability and high selectivity. It was further used to successfully real-time monitor DA released from living cells, demonstrating its great potential in practical applications in clinic diagnosis and bioscience research. The great sensing enhancement mechanism is investigated, revealing that the unique nanostructure not only provides a high density of active centers, but also more interestingly renders a unique mechanism by creating an atomic match between the adjacent Co ions catalysis centers and the two reaction atomic sites of DA for a fast 2-electron transfer path.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 3
·2077-2087
·
IF 3.553
Deng Peng,Jiao Qingjie,Ren Hui
Abstract In this work, laminated ammonium perchlorate-based composite (LAPC) with high thermal decomposition performance was prepared by ice-template freezing-induced assembly strategy. Cobalt-Konjac glucomannan (Co 2+ -KGM) hydrosol with rich AP embedded was designed and used as a frozen precursor. LAPC was obtained from the ice-template freezing of the hydrosol precursor and crystallization of AP molecules. The structure and morphology of as-obtained composite were characterized, and the thermal decomposition performances were investigated. The results showed that LAPC materials have micro-/nano-lamellar structures with the thickness size of 20 μm, which are composed of AP micro-/nanoparticles formed in the freezing crystalline progress and uniformly dispersed Co 2+ -KGM coated on the surface and inside of the micro-/nanoparticles. Thermal analysis results show that LAPC-2 has a lower decomposition temperature than raw AP, which have decreased by 114.3 °C. The activation energy of LAPC-2 thermal decomposition was reduced by 87 kJ/mol from 200 kJ/mol of AP to 113 kJ/mol of LAPC-2. A possible catalytic mechanism of thermal decomposition of LAPC is proposed. Under heating condition, the Co 2+ -KGM molecules firstly decomposed, and Co-based oxides can be in situ generated on the surface and inside of AP particles, resulting in enhancing the catalytic contact areas. Abundant distributed nanoscale Co-based oxides boosted the thermal decomposition of AP and exhibited excellent catalytic performances. Graphic abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Juan Zhang,Yulong Ma,Yonggang Sun,Lei Wang,Bolong Zhao,Min Xu,Liqiong Wang,Feng Lin,Yongsheng Ren
The introduction of oxygen vacancies (O v ) into Co-based metal oxides has been considered a promising strategy for activating peroxymonosulfate (PMS) to effectively degrade refractory organic contaminants. However, the types of reactive oxygen species (ROS) generated in O v -catalyst/PMS systems exhibited variability. Therefore, the effect of the interaction between O v and PMS on ROS generation required further research. Herein, the O v -tuned 2D porous Co 3 O 4 catalysts were easily constructed by simply controlling the NaBH 4 concentration. The as-prepared 2D Co 3 O 4 -1.6 had the highest O v content (2.88 × 10 14 spins/g, δ = 0.726), and its catalytic activity for benzotriazole (BTA) degradation ( k = 0.032 min −1 ) was three times higher than that of pristine 2D Co 3 O 4 ( k = 0.011 min −1 ). A series of characterizations and DFT calculations demonstrated that the major active site was Co(II), with O v serving as an localized electron-rich co-site. These dual sites synergistically improved the adsorption capacity for PMS, enabling rapidly electrons transfer to PMS while promoting the dissociation of O-O bond in PMS to form multiple ROS. Compared to the pristine 2D Co 3 O 4 /PMS system, which was dominated only by SO 4 − , the key ROS in the 2D Co 3 O 4 -1.6/PMS system were found to be 1 O 2 (3.56 µM) and SO 4 − (2.53 µM), while both O 2 – (0.72 µM) and OH (0.65 µM) were involved in the activation reaction, the contributions of these four ROS were as follows: 1 O 2 (36.8%) > SO 4 − (25.4%) > O 2 – (9.5%) > OH (6.3%). Finally, three possible degradation pathways of BTA were proposed, and the toxicity of BTA degradation decreased with time, which was consistent with the toxicity prediction results of eleven intermediates. This study provides new insights into the key role of O v in the heterogeneous catalytic system of PMS-based advanced oxidation processes.
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
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Bo Shuowen,Zhang Xiuxiu,Wang Chengming,Wang Huijuan,Chen Xin,Zhou Wanlin,Cheng Weiren,Liu Qinghua
Fully triggering the deep-seated potential of traditional nanomaterials, such as the classic spinel family, is of paramount importance in the field of materials science, which is yet believed to heavily depend on advanced conceptual designs and synthetic strategies. Herein, a type of inorganic–organic hybrid spinel oxide is designed using a π-conjugated azobenzene single-tooth coordination method to overcome their stubborn problems of moderate activity and phase instability in electrocatalytic reactions. Taking spinel Co 3 O 4 nanocubes as a pre-catalyst, after subtle etching of the cube surfaces, some oxygen atoms in the tetrahedral Co–O coordination field are replaced and selectively linked to weakly polar azo-extended π-conjugated units ( π *–N=N– π *) via electrophilic carboxyl groups. The π-conjugation structure in Co 3 O 4 suppresses the covalency competition between the tetrahedral and octahedral Co–O coordination fields, successfully preventing the phase transition during the electrocatalytic process and improving the electrocatalytic activity and durability. This study not only expands the spinel family but also provides useful guidelines for developing advanced functional 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
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 28
·285501
·
IF 3.5
Yaxu Zhao,Lijun Liang,Wei Guo,Xiong Lu,Congyi Zhao,Faming Gao
Efficient and portable electrochemical biosensors are received to evaluation of pesticides in the environment, which can make great significance for food safety. In this study, the Co-based oxides with a kind of hierarchical porous hollow and nanocages were constructed, in which the materials (Co3O4-NC) were encapsulated with PdAu nanoparticles (NPs). Due to the unique porous structure, the changeable valence state of cobalt and the synergistic effect of bimetallic PdAuNPs, PdAu@Co3O4-NC possessed excellent electron pathways, and showed more exposed active sites. Accordingly, the porous Co-based oxides have been applied to construct an acetylcholinesterase (AChE) electrochemical biosensor, which showed good performance for organophosphorus pesticides (OPs) detection. The optimum biosensing platform based on nanocomposites was applied to exhibit highly sensitive determination of omethoate and chlorpyrifos, with the relative low detection limit of 6.125 × 10−15 M and 5.10 × 10−13 M, respectively. And a wide detection range of 6.125 × 10−15 ∼ 6.125 × 10−6 M and 5.10 × 10−13 ∼ 5.10 × 10−6 M for these two pesticides were achieved. Therefore, the PdAu@Co3O4-NC may represent a powerful tool for ultrasensitive sensing of OPs, and have great potential application.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 40
·e09293
·
IF 12.1
Jianxiong Wang,Zuo Li,Wei Chen,Longfei Sun,Chunwen Sun,Suping Peng
Reversible protonic ceramic cells (R-PCCs) are a kind of distinguished long-time energy conversion and storage device. The utilization of oxygen electrodes is vital to achieve high electrochemical performances for R-PCCs, demanding high catalytic activity toward oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and appropriate thermal expansion coefficients (TEC). Herein, novel high-entropy perovskites Pr 0.2 Ba 0.2 Sr 0.2 La 0.2 Nd 0.2 MeO 3-δ (Me = Co, Fe, Mn) are explored. Pr 0.2 Ba 0.2 Sr 0.2 La 0.2 Nd 0.2 CoO 3-δ (PBSLNC) exhibits a TEC of 12.02 × 10 −6 K −1 , which is thermomechanical compatible with BaCe 0.7 Zr 0.1 Y 0.1 Yb 0.1 O 3-δ (BCZYYb) electrolyte. The cell with PBSLNC electrode delivers a peak power density of 0.87 W cm −2 in fuel cell (FC) mode and a current density of −1.39 A cm −2 at 1.3V and 650 °C under H 2 O electrolysis (EC) mode. The R-PCCs with PBSLNC electrode also achieve a distinguished current density of −1.45 A cm −2 at 1.3 V and 700 °C under CO 2 -H 2 O co-electrolysis condition. Moreover, the R-PCCs with PBSLNC electrode demonstrate exceptional stability for 150 h in both FC and EC modes, 96 h in H 2 O-CO 2 co-electrolysis mode, and 100 h (10 cycles) in reversible mode. This research provides a novel oxygen electrode for R-PCCs, as well as a strategy to design efficient Co-based oxide catalysts with low TEC for advanced R-PCCs.
研究领域:
材料科学
·
电化学
·
能源存储与转换
·
固体氧化物电化学
·
功能陶瓷
·
催化材料
✓ 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）