ChemCatChem
·
2020
·Vol. 12
·期 6
·1639-1646
·
IF 4.853
Pan Li,Jianzhi Wang,Ning Cai,Lei Wang,Jing Tong,Faquan Yu
Graphical The center of attention : The CuO x @CoO nanorods grown on Cu Foam with the hierarchical configuration and the heterojunction interfaces enjoyed a couple of advantages of self-supported electrodes: needing no glue as an electrode, avoiding the agglomeration of MOFs-based particles, and forming the outward active figuration and large specific surface area. Those features lead to superior OER performances. The fabrication of cost-effective and performance-advanced electrocatalysts is in great requirements for water splitting to achieve sustainable oxygen production. A simple and effective precursor of ZIF-67 particles mounted on Cu(OH) 2 nanorods was induced by a template alignment method. After annealing, hierarchical CoO polyhedron-decorated CuO/Cu 2 O (CuO x ) nanorods on Cu foam (denoted as CuO x @CoO NRs/CF) were achieved, which displayed the heterojunction in CuO x components, hierarchical configuration and outward active sites. These features, verified by HRTEM, SEM, XPS and EDX, optimized the oxygen evolution reaction (OER) electrocatalyst. Benefiting from its large electrochemical surface area and the synergetic effect between CuO x and CoO, CuO x @CoO NRs/CF exhibited considerable catalytic activity with a low overpotential of 254 mV to obtain a current density of 10 mA cm −2 in alkaline electrolyte and a scarce loss of the initial catalyst activity over 24 h and over 5000 cycles. This work provides a channel to enhance the performance in OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 14
·22727-22732
·
IF 3.83
Xu Chen,Xi Sun,Jing Zhou,Defeng Zhou,Xiaofei Zhu,Jian Meng
Nd 0.2 Ce 0.8 O 3-δ (NDC) is one of the most common solid electrolyte materials used in solid oxide fuel cells (SOFCs). However, the densification temperature of NDC electrolyte is above 1400 °C. In this work, Bi 2 O 3 and CoO sintering aids were individually or synergistically added to Nd 0.2 Ce 0.8 O 3-δ (NDC) electrolytes through the sol-gel method to lower its sintering temperature . Effects of Bi 2 O 3 -CoO dual sintering aid on the sintering behavior, phase composition, microstructure, and electrochemical properties of NDC electrolyte were all investigated. The data revealed that Bi 2 O 3 -CoO dual-sintering aid doped-NDC (labeled as NDC-CB) possessed high density and superior conductivity at low temperatures, better than that of Bi 2 O 3 or CoO single sintering aid. NDC electrolyte doped with Bi 2 O 3 -CoO dual-sintering aid achieved highest relative density of 95.3% at 1100 °C and total conductivity of 5.765 × 10 -2 S cm -1 at 800 °C. Furthermore, NDC-CB displayed excellent physical and chemical compatibility with La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-δ (LSCF) cathode and NiO-NDC anode. Oxygen reduction reaction at LSCF/NDC-CB interface was improved by about 40% when compared to NDC. In sum, Bi 2 O 3 -CoO looks promising as dual-sintering additive for lowing sintering temperature and increasing electrical conductivity of NDC. Therefore, NDC-CB might be potential electrolyte for future intermediate-temperature solid oxide fuel cells (IT-SOFCs).
研究领域:
材料科学
·
电化学
·
能源材料
·
陶瓷
·
燃料电池
✓ 已验证
DOI
高影响因子
Reaction Chemistry & Engineering
·
2026
·
IF 2.9
Yuxia Li,Tingting Ge,Zehao Jing,Yanxia Zheng,Yuchao Li,Ming Wang,Haofei Huang,Cuncun Zuo
Tricyclodecanemonoaldehyde (TCDMA) and tricyclodecanedialdehyde (TCDDA) are key intermediates in fine chemicals and are typically synthesized via hydroformylation of dicyclopentadiene (DCPD). However, developing cost-effective and highly active catalysts with high selectivity remains a significant challenge. A series of M-doped CoO catalysts (M = Ag, Cu, Fe, Ni) are synthesized via a co-precipitation method for DCPD hydroformylation, and Ag is identified as the optimal dopant for synergistic regulation of CoO catalytic performance. The structure–activity relationships of the catalysts are systematically elucidated using a combination of characterization techniques, including XRD, SEM/TEM, in situ FTIR, H2-TPD, H2-TPR, and CO-TPR, and the reaction conditions (temperature, catalyst dosage, pressure, and time) are systematically optimized. Under the optimal reaction conditions (150 °C, 7 MPa, 24 h), the 10% Ag/CoO catalyst achieves a DCPD conversion of 72%, a total aldehyde selectivity of 90%, and a combined yield of TCDMA + TCDDA of over 65%. The introduction of Ag nanoparticles not only modulates the surface electronic structure of CoO to promote H2 adsorption and activation but also suppresses the excessive reduction and aggregation of cobalt active species during the reaction, thereby enhancing both catalytic activity and structural stability. Based on experimental characterization and performance evaluation, a dynamic catalytic cycle mechanism for DCPD hydroformylation on the Ag/CoO surface is proposed, clarifying the synergistic catalytic effects of Ag and CoO active sites. Compared with traditional precious metal catalysts, the Ag/CoO bimetallic catalyst features low cost, simple preparation, and excellent catalytic performance and exhibits significant potential for industrial application in the green synthesis of TCDMA and TCDDA.
✓ 已验证
DOI
高影响因子
IONICS
·
2017
·Vol. 24
·期 5
·1321-1328
·
IF 2.062
Zhou Rihui,Chen Yaqin,Fu Yuanyuan,Li Yanfei,Chen Shouhui,Song Yonghai,Wang Li
A novel graphene (G)-Co/CoO shaddock peel-derived carbon foam (SPDCF) hybrid was fabricated as anode materials for lithium-ion batteries. The preparation of G-Co/CoO SPDCF was according to the following two steps. Firstly, the dried shaddock peels were immersed into the mixture of Co(NO 3 ) 2 /graphene oxide for about 12 h. Then, the shaddock peels were taken out and heated at 800 °C for 2 h under N 2 atmosphere. The strategy is simple, low-cost, and environmentally friendly because the shaddock peel is abundant and renewable. The obtained G-Co/CoO SPDCF hybrid were carefully characterized by SEM, EDS, XPS, XRD, TGA, BET, TEM, and electrochemical techniques. The results showed that the carbonized shaddock peels had hierarchical porous nanoflakes structures and graphene was uniformly dispersed into the SPDCF. The nanosized Co/CoO was formed on the G-SPDCF. The resulted G-Co/CoO SPDCF hybrid could maintain a high capacity of 600 mA h g −1 at 0.2 A g −1 after 80 cycles, which was much higher than that of commercial graphite (372 mA h g −1 ). The enhanced performance might be ascribed to the existence of lots of uniform Co/CoO and the hierarchical G-SPDCF alleviating the mechanical stress during the process of lithiation/delithiation.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 13
·期 1
·1-15
·
IF 12.264
Tian Yuhui,Xu Li,Li Meng,Yuan Ding,Liu Xianhu,Qian Junchao,Dou Yuhai,Qiu Jingxia,Zhang Shanqing
Interface engineering of heterogeneous CoS/CoO nanocrystals and N-doped graphene composite facilitates high-performance oxygen reduction reaction and oxygen evolution reaction.
Density functional theory calculations and experimental results confirm the enhanced electrocatalytic performances via the proposed interface engineering.
The bifunctional oxygen electrocatalyst exhibits excellent performances in rechargeable Zn–air batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
催化化学
·
先进电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peijing Guo,Zhangyi Xiong,Shaoyu Yuan,Kaihong Xie,Haijun Wang,Yongjun Gao
Developing photocatalysts with high efficiency and low cost for water splitting is significant in the production of hydrogen using solar energy. In this report, a low-cost and environmentally-friendly photocatalyst (Co-CN-500) is achieved through a simple calcination procedure with natural chitin and cobalt nitrate as raw materials. With Eosin Y as photosensitizer in triethanolamine (TEOA) solution, the hydrogen evolution rate of Co-CN-500 can reach 12.63 mmol g -1 h -1 , which is higher than that of commercial Pt-C (10.34 mmol g -1 h -1 ) and other reported cobalt-containing photocatalysts. Characterization results prove the hybrid structure of cobalt ingredients involving cobalt monoxide and metal cobalt is essential for excellent photocatalytic performance. DFT calculations confirm the free energy of hydrogen adsorption and work function on Co/CoO hybrid surface are smaller than on Co (111) and CoO (111), making it easier to form adsorbed H that then produce H 2 .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 35
·14854-14865
·
IF 7.79
Xiaoqin Ye,Jinchen Fan,Yulin Min,Penghui Shi,Qunjie Xu
The development of non-noble metal electrocatalysts toward the oxygen evolution reaction (OER) is a key challenge in advancing electrocatalytic water splitting, which is essential for the commercialization of clean and renewable energy. A covalent organic framework (COF) has a precise and controllable structure, high π–π conjugation, large surface area, and porosity and shows great potential as an OER electrocatalyst. However, the relative conductivity and inherent instability greatly limit the further improvement of its performance. Herein, imine-based COF-supported Co/CoO nanoparticles (Co/CoO@COF) were developed for the high-performance electrocatalytic OER. For the Co/CoO@COF catalyst, Co/CoO could form a conjugation effect with the COF, which can increase the electron cloud density of the delocalized large π bond, then improve the conductivity. The combination of Co/CoO and COF effectively enhances the structural stability of the catalyst and enriches the catalytic active sites. Under alkaline conditions, the Co/CoO@COF shows a very low overpotential of 278 mV at a current density of 10 mA cm−2, and a Tafel slope of 80.11 mV dec−1 which is better than that of commercial RuO2.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Bozheng Wang,Wenjuan Bai,Gaoxing Wang,Kai Guo,Hongliang Duan,Yanming Xue,Chengchun Tang
Antibiotic pollution in the aquatic environment seriously threatens human health and ecological balance, which violates the trend of sustainable and green development in today's world. Therefore, how to effectively solve the current problem of antibiotic residues in water is highly imminent. Here, we developed CoO modified porous boron nitride fibers (CoO/P-BNFs) by relying on the strong adsorption of polar B–N bonds for cobalt(Ⅱ) to enhance the absorption and removal capacity for chlortetracycline (CTC). The prepared adsorbent was characterized via XRD , FT-IR, XPS , SEM, TEM and BET methods and then the adsorption behavior was explored by batches of experiments. The results indicated that CoO/P-BNFs achieved excellent removal percentage (97.69%) to CTC at 100 mg/L, which far exceeds the P-BNFs (46.08%) and other conventional adsorbents. The kinetics and isotherms could be well described by the pseudo-second-order model and Freundlich model, and the adsorption was a spontaneous exothermic process . In addition, the possible adsorption mechanisms of CTC onto CoO/P-BNFs were mainly π-π and cation-bridge interaction, while other forces such as hydrogen bond , Van de Waals force, electrostatic interaction and pore-filling effect also played an important role. Finally, our research results indicated that CoO/P-BNFs is a promising adsorbent for removing antibiotic contaminants from aquatic environment.
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
MATERIALS & DESIGN
·
2022
·
IF 9.417
Qianqian Chen,Panpan Lin,Xuanyu Du,Hiroyuki Inoue,Kazuro Kizaki,Tiesong Lin,Peng He
A new low-temperature magnetic Bi 2 O 3 -CoO-Fe 2 O 3 -B 2 O 3 (BCFB) glass was designed to acquire magnetic yttrium iron garnet (YIG/YIG) joint. This paper investigated the thermal behavior of BCFB glass and its wettability on YIG. The microstructural evolution, mechanical and electromagnetic properties of YIG/YIG joint were systematically studied. CoFe 2 O 4 nuclei were gradually formed, growing up into nano-scale CoFe 2 O 4 crystals in the glass seam. Meanwhile, some CoFe 2 O 4 crystals grew up excessively by swallowing nano CoFe 2 O 4 , reaching microns. YBO 3 reaction layer was formed and grew into YBO 3 whiskers at the interface of YIG/glass with the brazing temperature increasing. The joint shear strength increased, reaching a maximum of 85.2 MPa at 775 °C under the collaborative reinforcement of well-integrated interface and glass-ceramic seam, then declined due to the aggravative reaction. The dielectric constant of YIG/YIG joints decreased with the brazing temperature increasing, varying from 18.5 to 16.6 at the frequency of 10 MHz. AFM/MFM and VSM analyses indicate that the glass seam performed magnetic property. The saturation magnetization of BCFB glass reached about 4.2 emu/g and 5.0 emu/g heat-treated at 750 °C and 775 °C, respectively, which could effectively enhance the magnetism of the glass seam.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Lei Liu,Zijian Zhou,Changqing Wang,Jie Xu,Hongqiang Xia,Guozhang Chang,Xiaowei Liu,Minghou Xu
Co 3 O 4 has been regarded as one of the most promising materials for redox energy storage due to its high theoretical conversion and complete redox reversibility. However, when undergoing charge-discharge cycles at high temperature, the material becomes sintered. The reversibility of the cobaltous oxides highly deteriorates, and the reoxidation reaction rate notably decreases. In addition, the obvious thermal hysteresis in the redox reaction process also limits the energy storage performance of the material. In this work, Co 3 O 4 with different micro-nanostructured morphologies is synthesized to evaluate its thermochemical energy storage performance. The capacity of the synthesized and commercial Co 3 O 4 is tested by thermogravimetric analysis (TGA). The fresh and recycled oxides are well characterized. Results suggest that all samples show complete reversibility, and the conversion decreases slightly after 30 cycles. The synthesized samples show better performance, especially cubic Co 3 O 4 . The reoxidation rate of the commercial sample is approximately 150 μmol/min/g, but that of the cubic sample is approximately 300-200 μmol/min/g in the first five cycles. The oxidation rate of the cubic sample decreases and finally remains at about 180 μmol/min/g from the 5th cycle to the 30th cycle. After 5 charge-discharge cycles, the commercial Co 3 O 4 is severely sintered, while the cubic oxides are only slightly sintered. After 30 redox cycles, the morphology of commercial oxides completely changed, while that of the cubic oxide retains the approximate shape of a cube. Moreover, the thermal hysteresis values of the commercial and cubic Co 3 O 4 are 24.7°C and 10.1°C, respectively, suggesting that the energy loss of cubic oxides is much smaller. The higher exothermic temperature of the cubic Co 3 O 4 redox process also indicates that it can supply high-grade thermal energy.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Lechen Diao,Wei Zhou,Biao Zhang,Chunsheng Shi,Zhichao Miao,Jin Zhou,Chunnian He
Developing highly efficient, low-cost, and stable bifunctional oxygen electrocatalysts is essential for the wide popularization of rechargeable Zn-air batteries. Combining zero-dimensional metal nanoparticles with two-dimensional metal oxide nanosheets is an appealing strategy to balance performance and cost. However, the precise construction of these composites remains a great challenge, and their interaction mechanisms lack thorough study. Herein, a cobalt-oxide-based bifunctional oxygen electrocatalyst comprising a rich Co-CoO heterointerface (CoO/Co@NG) was synthesized via a NaCl sealing-assisted pyrolysis strategy. The NaCl crystals played the role of a closed nanoreactor , which facilitated the formation of a CoO-Co heterojunction . Experimental results and theoretical calculations confirmed that the ingeniously constructed heterojunction expedited the oxygen reduction reaction and oxygen evolution reaction kinetics, which is superior to Pt/C. When serving as the air electrode in an assembled liquid-state Zn-air battery , the battery shows high power density (215 mW cm −2 ), specific capacity (710 mAh g zn −1 ), and outstanding durability (720 h at 10 mA cm −2 ). This work provides an innovative avenue to design high-performance heterojunction electrocatalysts for perdurable Zn-air batteries.
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
FUEL
·
2024
·
IF 6.7
Yi Li,Yuhang He,Yujuan Pu,Tao Duan,Youkui Zhang
The use of electrochemical tactics to reduce nitrate to the valorized product ammonia has become the hot topic. Recently, the synergistic effect of metal/metal oxide is provided to significantly enhance the electrocatalytic performance of nitrate reduction as opposed to monometallic catalyst. In this work, a reticulated fibre structure with Cu/CoO nanoparticles (Cu x Co y O-NC) was prepared for electrocatalytic nitrate reduction (NO 3 - RR) to ammonia. The optimized catalyst (Cu 1 Co 1 O-NC) displayed brilliant performance for NO 3 - RR with high Faraday efficiency (FE) of 97.9 %, the excellent NH 3 yield rate of 0.45 mmol h −1 cm −2 , prominent NH 3 selectivity of 98.4 % and efficient NO 3 – conversion of 99.2 % at −0.79 V vs reversible hydrogen electrode (RHE). Besides, Cu 1 Co 1 O-NC also exhibits the potential for uranium recovery from simulated wastewater containing nitrate and uranyl ions with a total yield of 508 mg ammonium diuranate after i-t measurement for 6 times. This work not only provides an efficient catalyst for reduction nitrate but also proposes the sustainable method for uranium containing sewage realizing nitrogen cycle.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）