INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Rui Yu,Ying-Xia Du,Heng-Fan Zhao,Fei-Fei Cao,Wang-Ting Lu,Geng Zhang
The electrochemical water splitting in alkaline media is troubled by the lack of efficient electrocatalysts for hydrogen evolution reaction (HER). Herein, a crystalline/amorphous CoP/MnO x heterostructure is converted from a single-phase bimetallic Co–Mn oxide by phase separation strategy. The CoP/MnO x heterostructure only requires an overpotential of 135 mV to reach 10 mA cm −2 in 1 M KOH, which is lower than that of CoP (184 mV). The interface effect between CoP and MnO x is beneficial to the improvement of HER activity, which is confirmed by means of selective etching of MnO x and infrared spectroscopy . Moreover, the crystal size of CoP phase in the heterostructure is lower than that of the mono-component CoP. Furthermore, the decrease of precursor crystal size will give rise to a decrease in the CoP crystal size of heterostructure. The decline of crystal size results in higher active surface area and greater number of interfaces.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Li Luo,Hanyu Li,Shantang Liu
The development of high-performance, excellent stability, and cost-effective non-precious metal catalysts is essential for large-scale electrochemical water splitting. In this study, we designed and constructed novel NiMo X /CoP heterostructures with nanoflower morphology through hydrothermal, phosphorization, and magnetron sputtering processes, serving as efficient hydrogen and oxygen evolution reaction (HER and OER) catalysts. Electrochemical tests indicate the optimal sample NiMo 450 /CoP exhibited excellent hydrogen evolution performance in an alkaline electrolyte, with overpotentials of only 30 and 215 mV at current densities of 10 and 100 mA cm −2 , respectively. Notably, the NiMo 450 /CoP delivers outstanding long-term stability, maintaining 94 % of its initial performance over 60 h at a current density of 10 mA cm −2 . Furthermore, NiMo 450 /CoP also demonstrated the lowest OER overpotential (216 mV at 10 mA cm −2 ), and the assembled two-electrode electrolyzer operated efficiently with a low cell voltage of 1.54 V. The excellent catalytic performance and stability may be attributed to the synergistic effect of NiMo alloy and the layered heterostructure of NiMo X /CoP. This research outlines a method for preparing high-activity non-precious metal catalysts, which has the potential to promote industrial water splitting applications.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bingyao Huang,Fei Wang,Hongyan Li,Yuan Li,Kai Li
Efficient resourceful treatment of phosphine tail gas is a huge challenge. In this study, a series of cobalt nanoparticles embeded in porous carbon (Co@C) catalysts were obtained via pyrolysis of Co-based MOF as precursor for catalytic decomposition of phosphine (PH 3 ) by regulating the ratio of reactants of MOFs. The composition, morphology and structure of the catalysts were characterized by inductively coupled plasma, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and BET measurement. The effect of Co@C catalysts with different reactant ratio on the catalytic decomposition of PH 3 was tested, and the catalysts before and after the reaction were compared. It was found that the catalyst with MOF as the precursor after pyrolysis can still retain the porosity and large specific surface area of MOF. The metal cobalt nanoparticles and its oxides can be uniformly distributed in time under high loading, which is conducive to the reaction with phosphine to form metal phosphide (CoP), and the rapid and efficient decomposition of PH 3 was completed under the synergistic effect of the two kinds of active sites of Co and CoP. The best catalytic decomposition efficiency is Co@C-5 catalyst, which can achieve 100 % decomposition efficiency at 350 °C and has good stability.
研究领域:
催化材料
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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
Materials Today Communications
·
2023
·
IF 3.8
Xiao Zhang,Yuxiao Chu,Xianqiang Xiong,Qianmin Fan,Deman Han,Chenglin Wu
Despite the narrow band gap and the suitable band edge position, the BiVO 4 photoanode exhibits low metal anticorrosion performance due to inefficient charge separation and transfer. In this work, we introduce a CoP electrocatalyst with metal character on the BiVO 4 surface by cyclic voltammetry to address this challenge, which greatly enhances the electron injection efficiency into the protected metal. The modified BiVO 4 photoanode exhibits high solar water oxidation activity, resulting in a 123 mV cathodic shift on the self-corrosion potential of 304 stainless steel (304SS), enabling excellent metal protection. Additionally, the coupled composite photoanode shows high photo stability under light illumination, with only 8% decay on the open circuit potential after 51 h of photo-illumination. Our mechanism study shows that the CoP overlayer can act as the hole collector and electrocatalyst for water oxidation, and thus the BiVO 4 valence band holes are effectively transferred to the CoP and subsequently to water. Such an improvement inhibits the charge recombination increasing the electron lifetime, and thus realizing the effective protection of 304SS. The present work offers a rather simple process that allows the effective deposition of CoP electrocatalyst on BiVO 4 surfaces, which effectively protects metals from corrosion.
研究领域:
材料科学
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电化学
·
能源与环境科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 35
·2001478
·
IF 16.836
Cheng Cai,Yuan Teng,Jian-Hao Wu,Jun-Yan Li,Hong-Yan Chen,Jing-Hua Chen,Dai-Bin Kuang
Halide perovskite like methylammonium lead iodide perovskite (MAPbI 3 ) with its prominent optoelectronic properties has triggered substantial concerns in photocatalytic H 2 evolution. In this work, to attain preferable photocatalytic performance, a MAPbI 3 /cobalt phosphide (CoP) hybrid heterojunction is constructed by a facile in situ photosynthesis approach. Systematic investigations reveal that the CoP nanoparticle can work as co-catalyst to not only extract photogenerated electrons effectively from MAPbI 3 to improve the photoinduced charge separation, but also facilitate the interfacial catalytic reaction. As a result, the as-achieved MAPbI 3 /CoP hybrid displays a superior H 2 evolution rate of 785.9 µmol h −1 g −1 in hydroiodic acid solution within 3 h, which is ≈8.0 times higher than that of pristine MAPbI 3 . Furthermore, the H 2 evolution rate of MAPbI 3 /CoP hybrid can reach 2087.5 µmol h −1 g −1 when the photocatalytic reaction time reaches 27 h. This study employs a facile in situ photosynthesis strategy to deposit the metal phosphide co-catalyst on halide perovskite nanocrystals to conduct photocatalytic H 2 evolution reaction, which may stimulate the intensive investigation of perovskite/co-catalyst hybrid systems for future photocatalytic applications.
研究领域:
材料科学
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光化学
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催化
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2017
·Vol. 2017
·期 31
·3729-3735
·
IF 2.444
Bei Wang,Qiang Ru,Qing Guo,Xiaoqiu Chen,Zhen Wang,Xianhua Hou,Shejun Hu
Graphical Mesoporous 1D CoP nanorods were synthesized by a hydrothermal method and subsequent low-temperature phosphorization. As an anode for Li ion batteries, CoP delivers a high discharge capacity (894 mAh g –1 ; 300 cycles) at a current density of 500 mA g –1 . At a current density of 4000 mA g –1 , the rate capacity is 467 mAh g –1 , showing good reversible capacity, cycling stability, and rate capability. One-dimensional mesoporous CoP nanorods have been successfully synthesized via a facile hydrothermal method and subsequent low-temperature thermal phosphorization treatment. At a current density of 500 mA g –1 , CoP nanorods as anode materials for lithium ion batteries deliver a high discharge capacity of 894 mAh g –1 after 300 cycles, with a coulombic efficiency of over 99 %. Even at a high current rate of 4000 mA g –1 , the discharge capacity of the CoP electrode can still retain 467 mAh g –1 . The results suggest that the introduction of cobalt and the special mesoporous nanorods play important roles in enhancing the electrochemical properties. Therefore, this rodlike CoP electrode is competent as a promising anode material for high-performance lithium-ion batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·1996
·
IF 4.4
Dongxu Wang,Wanfeng Mao,Lihong Zhao,Duo Meng,Jiaqi Tang,Tengfei Wu
With the development of industry, agriculture, and aquaculture, excessive ammonia nitrogen mainly involving ionic ammonia (NH4+) and molecular ammonia (NH3) has inevitable access to the aquatic environment, posing a severe threat to water safety. Photocatalytic technology shows great advantages for ammonia nitrogen removal, such as its efficiency, reusability, low cost, and environmental friendliness. In this study, CP (g-C3N4/CoP) composite materials, which exhibited high-efficiency ammonia nitrogen removal, were synthesized through a simple self-assembly method. For the optimal CP-10 (10% CoP) samples, the removal rate of ammonia nitrogen reached up to 94.8% within 80 min under visible light illumination. In addition, the nitrogen selectivityS(N2)is about 60% for all oxidative products. The high performance of the CP-10 photocatalysts can be ascribed to the effective separation and transmission of electron–hole pairs caused by their heterogeneous structure. This research has significance for the application of photocatalysis for the remediation of ammonia nitrogen wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 39
·33120-33125
·
IF 3.289
Dan Zhao,Bing Sun,Xiangqing Li,Lixia Qin,Shizhao Kang,Dong Wang
Exploiting earth-abundant cocatalysts for photocatalytic hydrogen evolution is of great interest. Herein, earth-abundant CoP was used as a cocatalyst to fabricate a CdS nanorod based photocatalytic system. Meanwhile, visible light-driven H2 evolution over the CoP decorated CdS nanorods was investigated. Moreover, the electrochemical behavior and photoelectrochemical behavior of the CdS/CoP photocatalytic system were explored to deeply demonstrate the essential role that CoP played in the photocatalytic process. Lastly, the photocatalytic mechanism was preliminarily discussed. The results indicated that the photocatalytic activity of the CdS nanorods could be remarkably enhanced due to the introduction of CoP. Under optimal conditions, a rate of H2 evolution of approximately 2.12 mmol h−1 was achieved and the apparent quantum yield was up to 27.1% at 435 nm, which was about 20 times higher than that over the CdS nanorods and 1.5 times higher than that over the Pt loaded CdS nanorods, respectively. This dramatic photocatalytic activity of the CoP modified CdS nanorods may be ascribed to the low H+ reduction overpotential on the CoP particles and the efficient electron transfer between CdS and CoP. The present work demonstrates that CoP is a promising alternative to Pt as an efficient cocatalyst for CdS.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Yanping Li,Qiong Hu,Jihui Zhang,Hong Zhou,Na Wang,Yishan Fang,Bo Cui
Herein, an enhanced electrochemiluminescence (ECL) aptasensor driven by a complex (T4PPVB-COP@CdS QDs) with large specific surface area and high stability was constructed for highly sensitive detection of chlorpyrifos (CPF), using electrostatic interactions and signal amplification techniques. In the presence of CPF, the specific binding between the aptamer and CPF caused partial detachment of the aptamer from the sensor, thus restoring the ECL signal. Notably, gold nanoparticles functionalized with streptavidin (SA) as signal enhancers further amplified the ECL signal in specific interactions with aptamers, thereby improving the sensitivity of the assay. Based on this, the proposed ECL aptasensor demonstrated significant detection performance for CPF with a linear range of 1–10 7 pg/mL and a LOD of 0.34 pg/mL. Furthermore, the feasibility of the ECL aptasensor was validated by the detection and analysis of CPF in real samples, which also provided a broad reference value for bioanalysis.
研究领域:
分析化学
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环境科学
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生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Xiaodong Chen,Xiaoling Luo,Xuefeng Zhang,Huize Wang,Yongcheng Li,Lifang Ye,Jiahua Zheng,Hao Li
Graphical Urchin-like NiCoP/CoP heterostructures have been developed through a three-step hydrothermal-oxidation-phosphorization synthesis process. The nano-architecture and electronic configuration can be regulated by adjusting the original Ni/Co molar ratio and the amount of phosphorus. Consequently, the optimal Ni 1 Co 2 P shows excellent performance in the hydrolytic dehydrogenation of ammonia borane. Furthermore, by combining infrared spectroscopy and isotope kinetics experiments, a possible reaction mechanism has been proposed. The exploration of stable, efficient, and low-cost catalysts toward ammonia borane hydrolysis is of vital significance for the practical implementation of this hydrogen production technology. Integrating interface engineering and nano-architecture engineering is a favorable strategy to elevate catalytic performance, as it can modify the electronic structure and provide sufficient active sites simultaneously. In this work, urchin-like NiCoP/CoP heterostructures are prepared via a three-step hydrothermal-oxidation-phosphorization synthesis route. It is demonstrated that the original Ni/Co molar ratio and the amount of phosphorus are crucial for adjusting the morphology, enhancing the exposed surface area, facilitating charge transfer, and modulating the adsorption and activation of H 2 O molecules. Consequently, the optimal Ni 1 Co 2 P heterostructure displays remarkable catalytic properties in the hydrolysis of ammonia borane with a turnover frequency (TOF) value of 30.3 mol H2 ⋅ min −1 ⋅ mol metal −1 , a low apparent activation energy of 25.89 kJ ⋅ mol −1 , and good stability. Furthermore, by combining infrared spectroscopy and isotope kinetics experiments, a possible mechanism for the hydrolysis of ammonia borane was proposed.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·Vol. 42
·期 7
·3947-3954
·
IF 3.205
Jialei Jin,Yuanzhi Zhu,Yizhe Liu,Yang Li,Wenchao Peng,Guoliang Zhang,Fengbao Zhang,Xiaobin Fan
Producing hydrogen through hydrogen evolution reaction by electrolyzing water is a great alternative to solve the energy crisis and air pollution. Earth abundant transition-metal phosphides, especially CoP , have emerged as promising hydrogen evolution reaction catalysts for recent years. Nowadays, attention is focused on combining CoP with other materials to improve its catalytic activity . Herein, in order to get better hydrogen evolution reaction catalyst, we combined CoP nanoparticles with WS 2 nanosheets. Different CoP to WS 2 mass ratios were set to find the best catalytic activity. CoP/WS 2 composites were prepared through a simple ultrasound induced mixing method. And all the CoP/WS 2 composites have enhanced hydrogen evolution reaction catalytic activity than pure CoP nanoparticles and WS 2 nanosheets. Especially, the optimized CoP/WS 2 composite has the lowest onset overpotential of 50 mV, the largest current density of 78 mA/cm 2 at the overpotential of 300 mV, and the smallest Tafel slope of 64.63 mV/decade, indicating excellent hydrogen evolution reaction catalytic activity.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
无机功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huanhuan Zhang,Guosheng Han,Yanyan Liu,Lingli Zhao,Wenbo Zhang,Muhammad Tahir Khalil,Huijuan Wei,Chengming Wang,Tao Liu,Xianji Guo,Xianli Wu,Jianchun Jiang,Baojun Li
Designing non-precious catalysts to synergistically achieve a facilitated exposure of abundant active sites is highly desired but remains a significant challenge. Herein, a hetero-structured catalyst CoP-Co supported on porous g-C 3 N 4 nanosheets (CoP-Co/CN-I) was prepared by pyrolysis and P-inducing strategy. The optimal catalyst achieves a turnover frequency ( TOF ) of 26 min −1 at room temperature and the apparent activation energy ( E a ) is 35.5 kJ·mol −1 . The catalytic activity is ranked top among the non-precious metal phosphides or the other supports. Meanwhile, the catalytic activity has no significant decrease even after 5 cycles. The CoP/Co interfaces provide richly exposed active sites, optimize hydrogen/water absorption free energy via electronic coupling, and thus improve the catalytic activity. The experimental results reveal that the CoP/Co heterojunction improves the catalytic activity due to the construction of dual-active sites. This research facilitates the innovative construction of non-noble metal catalysts to meet industrial demand for heterogeneous catalysis .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）