JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Manigandan Ramadoss,Yuanfu Chen,Yang Hu,Bin Wang,Ramkumar Jeyagopal,Karpuraranjith Marimuthu,Xinqiang Wang,Dongxu Yang
The sluggish kinetics and high cost of the noble-metal based electrocatalyst for oxygen evolution reaction (OER) still seriously limits the efficiencies of water splitting. Herein, for the first time, we rationally design a porous hierarchical nanoarchitecture, constructed by ultrathin CoSe 2 embedded Fe-CoO nanosheets (CoSe 2 @Fe-CoO), which is synthesized via self-assembly hydrolysis driven in-situ synergetic selenization of Fe/Co/O/Se precursor followed by Ostwald ripening. As an OER catalyst, the porous CoSe 2 @Fe-CoO hybrid with abundant CoOOH electroactive sites delivers a small Tafel of 56.2 mV/dec with very low onset overpotential of 280 mV@10 mA/cm 2 and excellent long-term physicochemical stability till 62 h without obvious decay, which outperforms well-established benchmark electrocatalysts (RuO 2 ). The boosted OER performance of CoSe 2 @Fe-CoO nanosheets is mainly attributed to its iron-doping effect, porous nanoarchitecture, and multicomponent synergetic/interfacial effect between ultrathin cobalt (II) oxide and conductive cobalt selenide (CoSe 2 ) nanoframework. This work presents a facile construction strategy to find a nonprecious hybrid OER electrocatalyst with excellent performance and long-term stability.
研究领域:
材料科学
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电化学
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纳米技术
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催化
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 10
·1647-1655
·
IF 2.232
Duan Meng-ting,Wu Meng-rong,Xue Kai,Bian Zheng-xu,Shi Jing,Guo Xing-mei,Cao Fu,Zhang Jun-hao,Kong Qing-hong,Zhang Feng
To improve the sulfur loading capacity of lithium-sulfur batteries (Li-S batteries) cathode and avoid the inevitable “shuttle effect”, hollow N doped carbon coated CoO/SnO 2 (CoO/SnO 2 @NC) composite has been designed and prepared by a hydrothermal-calcination method. The specific surface area of CoO/SnO 2 @NC composite is 85.464 m 2 ·g −1 , and the pore volume is 0.1189 cm 3 ·g −1 . The hollow core-shell structure as a carrier has a sulfur loading amount of 66.10%. The initial specific capacity of the assembled Li-S batteries is 395.7 mAh·g −1 at 0.2 C, which maintains 302.7 mAh·g −1 after 400 cycles. When the rate increases to 2.5 C, the specific capacity still has 221.2 mAh·g −1 . The excellent lithium storage performance is attributed to the core-shell structure with high specific surface area and porosity. This structure effectively increases the sulfur loading, enhances the chemical adsorption of lithium polysulfides, and reduces direct contact between CoO/SnO 2 and the electrolyte.
研究领域:
材料科学
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能源存储
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电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Yajun Ding,Weiyi Yang,Shuang Gao,Wuzhu Sun,Caixia Sun,Qi Li
The development of highly efficient, non-noble-metal-based bifunctional oxygen electrocatalysts with low cost for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is the key for the commercialization of rechargeable metal-air batteries and regenerative fuel cells. In this work, a non-noble-metal-based, hierarchically porous CoO/Co@N–C microsphere electrocatalyst with low cost and earth-abundance was created by directly reducing carbonized glucose-coated urchin-like Co3O4 microspheres through the carbon-thermal processing with NH3 reducing environment. Urchin-like Co3O4 microspheres provided a Co source for the creation of nano-CoO/Co active phase and served as the template without a removal requirement for the creation of hierarchically porous N-doped carbon microsphere matrix with abundant macropores and mesopores for efficient mass diffusion. Among its three major components, CoO played the leading role to provide both ORR and OER active sites, a porous N-doped carbon microsphere matrix mainly provided the conductive catalyst support, and the metallic Co component mainly acted as a “bridge” between CoO and graphic carbon to reduce the electron transfer resistance for the enhancement of its conductivity. Thus, their synergetic effect within its unique structure endowed a superior bifunctional performance toward both ORR and OER to the CoO/Co@N–C electrocatalyst over the commercially available Pt/C and Ir/C electrocatalysts.
研究领域:
材料科学
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电化学
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能源存储与转换
✓ 已验证
产品关联
DOI
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Meng Xie,Junchuan Tang,Guodong Fang,Mengping Zhang,Lingshuai Kong,Feng Zhu,Long Ma,Dongmei Zhou,Jinhua Zhan
The development of highly active and multifunctional carbocatalysts modified with heteroatoms or metal species is crucial for practical environmental remediation applications. In this study, nitrogen-doped porous carbon embedded with highly dispersed CoO nanodots (CoO-N-C) was successfully prepared from a biomass-derived Schiff base polymer for the first time. The morphology analysis shows that CoO nanodots were embedded in the N doped carbon layer with size of ∼6.5 nm. CoO-N-C catalyst exhibited excellent 4-CP adsorption efficiency as well as excellent catalytic performance in the activation of peroxymonosulfate (PMS) for 4-CP degradation. Total organic carbon (TOC) removal was close to 99.7% and involved a combination of adsorption and degradation processes. Singlet oxygen ( 1 O 2 ) was found to be the dominant oxidative species for 4-CP degradation. The underlying mechanism of these processes were elucidated, and it was found that the introduction of CoO nanodots in CoO-N-C not only enhanced radical catalytic processes, but also significantly enhanced the non-radical catalytic processes of PMS activation . This derived from the synergistic effect between the embedded CoO nanodots and doped nitrogen for the increase of electron density on carbon surface of catalyst, thereby accelerating the electron transfer process for PMS activation and improving the catalytic performance.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Jie Yu,Yonghong Ni,Muheng Zhai
Co-based compounds, especially cobalt oxides, have been widely employed as the non-enzyme catalysts for the electro-oxidation of glucose. In this work, we designed a solution-combustion and subsequent heat-treating route to successfully prepare Co-CoO-Co 3 O 4 nanocomposites. Co-CoO nanocomposites were first obtained in one step via a simple solution-combustion method, employing CoCl 2 as the Co source, oxygen in air as the oxygen source, and ethanol as the solvent and fuel; and then, the freshly-prepared Co-CoO nanocomposites were annealed in air at 300–600 °C for 2 h. Experiments showed that the annealing temperature strongly affected the component of the final product. Co-CoO-Co 3 O 4 nanocomposites were produced at 300 and 400 °C; CoO-Co 3 O 4 nanocomposites were obtained at 500 °C; and Co 3 O 4 nanoparticles were formed at 600 °C. The above annealed products were labeled as T3, T4, T5 and T6. Electrochemical measurements showed that Co-CoO nanocomposite and its annealed products presented good electrochemical properties and could be employed as catalysts for the non-enzyme electro-oxidation of glucose. Among them, T4 sample (Co-CoO-Co 3 O 4 nanocomposites) possessed the best electrocatalytic activity. The as-prepared T4/GCE sensor showed rapid response time (<1s), high sensitivity (949.3 μA mM −1 cm −2 ), long linear range (0.005–0.6, 0.6–4.3 mM), low detection limit (0.92 μM), and good stability and selectivity.
研究领域:
材料科学
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分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Yanqing Cong,Lingjie Ye,Shiyi Zhang,Qiuyu Zheng,Yi Zhang,Shi-Wen Lv
Constructing hollow structure is an effective strategy to boost the activity of heterogeneous catalysts in peroxymonosulfate (PMS) activation. Herein, a newly-designed Ni-CoO yolk-shell hollow sphere was first synthesized by a step-by-step method. Interestingly, the etching treatment of NH 3 ·H 2 O endowed Ni-CoO sphere with hollow yolk-shelled structure, which was beneficial for the increase of specific surface area and the full exposure of active sites. The calcination treatment reduced the charge transfer resistance and enhanced the redox ability of Ni-CoO, further improving its catalytic activity . As expected, 93.1% of diclofenac sodium (DCF) could be rapidly degraded within 5 min over developed Ni-CoO-3/PMS system, and removal efficiency of TOC was as high as 73.3%. Significantly, redox couples of Co 3+ /Co 2+ and Ni 3+ /Ni 2+ were responsible for PMS activation based on radical pathways (namely SO 4 •− , OH • and O 2 •− ). As the typical radical pathway, 1 O 2 was also involved in DCF degradation. More importantly, Ni-CoO-3-PMS* complexes mediated the direct electron transfer between DCF and PMS. Furthermore, Ni-CoO-3/PMS system with great stability had excellent practical application prospect in actual wastewater treatment . In short, current work not only offered a high-efficiency catalyst for PMS activation, but also shared some insights into the research on advanced oxidation processes .
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 89
·56375-56381
·
IF 3.108
Xinxin Jin,Yu Jiang,Qi Hu,Shaohua Zhang,Qike Jiang,Li Chen,Ling Xu,Yan Xie,Jiahui Huang
Low-cost dual transition metal (Fe and Co) based non-noble metal electrocatalysts (NNMEs) have been explored to enhance the oxygen reduction reaction (ORR) performance in both alkaline and acidic solution. In this work, novel NNMEs derived from iron, cobalt and N-doped porous carbon materials (FeCo/NPC) were fabricated with magnesium oxide (MgO) as the hard-template. By optimizing the pyrolysis temperature (600 to 1000 °C) and the molar ratio of Fe to Co (Co, FeCo3, FeCo, Fe3Co, Fe), the highly active electrocatalyst FeCo/NPC (900) for ORR in alkaline solution was prepared, which possessed a large surface area of 958 m2 g−1. The onset potential (Eonset) and half-wave potential (E1/2) of FeCo/NPC (900) were 0.934 V and 0.865 V, respectively, comparable to the best values of NNMEs reported so far in ORR tests under alkaline conditions. Additionally, FeCo/NPC (900) exhibited better electrocatalytic properties than commercial Pt/C in terms of durability and the tolerance to methanol in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 8
·490
·
IF 3.8
Xingxing Chen,Qing Wu,Somboon Chaemchuen,Francis Verpoort
The ring-opening polymerization of L-lactide is a crucial route for producing biodegradable polylactides (PLAs). Developing an efficient catalyst for this process poses significant challenges. Herein, we report the successful incorporation of nickel during the crystallization of ZIF-67, the derivation of the abundant and stable CoO source, to obtain the composite magnetic Ni@CoO@ZIF-67 using the solid-state thermal (SST) method. The characterization of the resulting materials revealed that nickel atoms are well dispersed in the composite CoO@ZIF-67, imparting additional magnetic properties. The composite Ni@CoO@ZIF-67 demonstrated superior performance as a heterogeneous catalyst for the ring-opening polymerization of L-lactide compared to reference materials such as Ni-Hmim, CoO, ZIF-67, and CoO@ZIF-67. Furthermore, the magnetic property of Ni@CoO@ZIF-67 offers practical advantages, enabling easier separation and recycling of the catalyst. Notably, the SST method facilitates the single-step synthesis of composite magnetic Ni@CoO@ZIF-67 under solvent-free conditions, representing a significant advancement in catalyst development. This approach not only simplifies the synthesis process but also inspires further developments of heterogeneous magnetic catalysts for a variety of effective and diverse reactions.
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 Energy Chemistry
·
2020
·
IF 7.216
Han Wu,Yaojia Cheng,Boyang Wang,Yao Wang,Min Wu,Weidong Li,Baozhong Liu,Siyu Lu
Ammonia borane (NH 3 BH 3 , AB) is promising for chemical hydrogen storage; however, current systems for rapid hydrogen production are limited by the expensive noble metal catalysts required for AB hydrolysis. Here we report the design and synthesis of a highly efficient and robust non-noble-metal catalyst for the hydrolysis of AB at 298 K (TOF = 89.56 mol H2 min −1 mol Co −1 ). Experiments and density functional theory calculations were performed to explore the catalyst’s hybrid nanoparticle heterostructure and its catalytic mechanism. The catalyst comprised nitrogen-doped carbon dots confining CoO and CoP , and exhibited strong interface-induced synergistic catalysis for AB hydrolysis that effectively decreased the energy barriers for the dissociation of both AB and water molecules. The co-doping of N and P introduced numerous defects, and further regulated the reactivity of the carbon layers. The heterogeneous interface design technique presented here provides a new strategy for developing efficient and inexpensive non-noble-metal catalysts that may be applicable in other fields related to energy catalysis.
研究领域:
材料科学
·
催化
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2022
·Vol. 3
·期 4
·2100211
·
IF 11.343
Fan Tang,Sijie Guo,Yonggang Sun,Xijie Lin,Jianhua Qiu,Anmin Cao
Developing high-performance, low-cost, and robust electrocatalysts is of great importance to boost the efficiency of oxygen evolution reaction (OER). Herein, based on the integrated design of chemical composition and geometric structure, Fe-doped CoO nanotubes (NTs) with high OER activity are prepared by a facile template-free approach. The construction of this tubular structure is realized via a simple wet-chemical reaction to prepare solid nanorods as precursor and a subsequent calcination treatment of the precursor to form hollow cavity. The favorable composition and unique hollow structure endow these Fe-doped CoO NTs with remarkable activity toward OER. When used as the electrocatalyst for OER, the Fe-doped CoO NTs show a small overpotential of 282 mV at the current density of 10 mA cm −2 , a low Tafel slope of 78.26 mV dec −1 , and a high turnover frequency of 0.0965 s −1 at the overpotential of 282 mV, which is superior to those of CoO NTs and solid CoO nanoparticles. Moreover, the Fe-doped CoO NTs also exhibit excellent long-term stability of 24 h at the current density of 10 mA cm −2 .
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Mengjie Zhang,Hong Xiao,Yang Liu,Wenshuo Hou,Xuting Li,Jianlin Deng,Linrui Hou,Changzhou Yuan
The sluggish redox kinetics and intrinsic dissolution of lithium polysulfides (LiPSs) critically hinder the desirable commercialization of Li-S batteries (LSBs). Purposeful modification of separators with multi-functional materials brings enormous room for both efficiently restraining the dissolution and enhancing the solid-liquid-solid conversion kinetics of LiPSs. For this, herein, hetero-architectured CoO-Co 3 O 4 hollow nanotubes (HNTs) are elaborately designed and fabricated via a self-sacrifice template methodology to modify the polypropylene (PP) separator for advanced LSBs. Besides the robust physico chemical adsorption, the endogenous CoO-Co 3 O 4 heterojunction, as authenticated by theoretical calculations and experimental verification, spontaneously creates an interfacial built-in electric field, which simultaneously enhances the active sites, accelerates the bi-directional sulfur conversion, and favors the fast electron/ion transport. Thanks to successful realization of the synergistic “electrostatic capture-energy barrier regulation-directional conversion” effect, LSBs with the hetero CoO-Co 3 O 4 HNTs modified PP separator exhibit significantly improved electrochemical performance with the long-duration cycling stability for 1000 cycles at 5 C, and a large capacity of 631.5 mAh g −1 even at a high sulfur loading (5 mg cm ‒2 ) and low electrolyte/sulfur ratio (8.0 µL mg −1 ). More essentially, our contribution here offers a viable avenue for up-and-coming hetero-catalyst functionalized separator platforms toward next-generation LSBs and beyond.
研究领域:
能源材料
·
电化学
·
纳米材料
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Peng Bo Niu,Yong Qiong Wang,Rong Hu,Tong Yang
With the improvement of the quality of life, the assessment of total antioxidant capacity (TAC) has attracted much attention in the field of a healthy diet, food analysis, or health guidelines. In this work, Cu nanoparticles (NPs)/CoO/carbon nanofibers (CNFs) as a promising nanozyme for peroxidase (POD) mimicking was synthesized by electrospinning and carbonation. Subsequently, a colorimetric sensing platform is constructed for TAC assessment by using 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogenic substrate based on Cu NPs/CoO/CNFs under presence of H2O2. The enhanced POD catalytic efficiency of Cu NPs/CoO/CNFs for TMB oxidation (ox-TMB) was about 3.2-fold higher than that of bare Cu NPs/CNFs or CoO/NFs, which was ascribed to the synergistic catalytic effect and the generation of heterogeneous interfaces between Cu NPs and CoO in CNFs. When some antioxidants such as AA, FA, TA, and GA were introduced in the chromogenic system, ox-TMB was reduced to colorless TMB, allowing the subsequent assessment of TAC. The results show that the limits of detection toward AA, FA, TA, and GA were 8.7, 8.3, 2.7, and 2.4 μM, respectively. Moreover, this proposed method was used for the TAC assay in real samples including fresh juices and commercial beverages, which showed good promise in practical applications such as food nutrition assessment, food analysis, personalized nutrition intervention, or staple food research.
研究领域:
材料科学
·
分析化学
·
食品科学
·
生物技术
✓ 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）