INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Laifei Xiong,Jinglei Bi,Liqun Wang,Shengchun Yang
Developing cheaper but efficient electrocatalysts toward hydrogen evolution reaction (HER) are highly desirable for the sustainable energy conversion techniques. The nanostructured CoP has been proved to be one of the most efficient non-noble metal HER catalyst. However, to further improve their performance in hydrogen evolution reaction (HER) is still a challenging task. In the present work, we prepare the nanohybrid CeO 2 -CoP-C catalyst with high porosity through a co-ionic-exchange with Co and Ce ions using the metal-organic frameworks (MOFs) as template followed with a low-temperature phosphorization route. The high porosity of the catalysts is conductive to the diffusion and mass transfer of the reactants on the catalyst surface . Meanwhile, the doping of rare earth (RE) element modulates the electronic structure of the CoP nanoparticles , and the carbon skeleton left over from the annealed MOF is beneficial to the electronic conduction in the catalyst. Electrochemical tests showed that the ternary CeO 2 -CoP-C/CC hybrid nanostructure presented overpotential of 71 mV at 10 mV cm −2 (η 10 ), which is much higher than that of the binary CoP-C/CC catalysts (i.e., 132 mV). In addition, the ternary catalyst also presented a superior long-term durability in an acidic electrolyte. This work opens up a potential strategy for designing more efficient CoP-based catalysts toward electrochemical water splitting.
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
Materials Today Sustainability
·
2021
·
IF 4.524
D. Zheng,C. Lv,X. Zhang,S. Chen,H. Liu,Y. Sun,X. She,D. Li,D. Yang
Developing cost-effective electrocatalysts with efficient activity and superior stability for hydrogen evolution reaction (HER) over a wide pH range is highly desirable and remains a significant challenge. Herein, we report CoP supported RuP 3 nanosheet (RuP 3 –CoP NS) HER electrocatalysts through an ice-templating method. Constructing heterojunctions of RuP 3 and CoP can reduce the loading of scarce Ru species in the catalyst, and meanwhile, maintain efficient HER activity over a wide pH range. The RuP 3 –CoP NS catalyst with only about 15 wt.% loading of Ru species exhibits remarkable HER performance with excellent catalytic stability and low overpotentials of 25, 60, and 81 mV at 10 mA/cm 2 in alkaline, acidic, and neutral media, respectively. The density functional theory calculations indicated that the RuP 3 could induce boosting the catalytic activity of P sites in CoP. The enhancement of the HER performance can be attributed to the electron transfer from RuP 3 to the P sites in CoP, which changes its electronic structure, and thus, optimizing the adsorption strength of H ∗ .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiaowan Yu,Kaiwei Huang,Yixin Zhang,Yuhan Jin,Yayu Chen,Fangchuan Chen,Xiaoyan Zhang
Bacterial infection and antibiotic resistance bring great trouble to anti-infective treatment. Therefore, it is urgent to develop antibacterial materials with high efficiency as alternatives. Herein, we successfully synthesized a series of peroxidase-like CoP/MoS2 catalysts to strikingly enhance the photocatalytic antibacterial activity. After excitation by LED light, the CoP/MoS2 heterojunction composite exhibited a photocatalytic sterilizing rate of 97.2% toward S. aureus with a concentration of 1 mg/mL. Based on the theoretical discussion and experimental result analysis, it is concluded that the sharp edges of MoS2 nanosheets, excellent hydrophilicity of CoP/MoS2, and incorporation with the generation of reactive oxygen radicals endow the catalyst with rapid and effective photocatalytic bacterial killing activity. This study provides a promising strategy by using adhesive nanozymes in close proximity to the bacteria surface, which will guide the design and synthesis of heterojunction photocatalysts with nanozymes activity and high photocatalytic antibacterial efficiency.
研究领域:
材料科学
·
微生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hui Zong,Ruijuan Qi,Ke Yu,Ziqiang Zhu
Hydrogen evolution is of great significance for reducing carbon emissions and realizing carbon-neutral. Hydrogen evolution reaction (HER) by water splitting has no carbon emissions and pollution, but it is still necessary to reduce cost and enhance catalytic activity. Herein, we report an ultra-thin Ti 2 NT x MXene-wrapped metal-organic frameworks (MOFs)-derived CoP composite (Ti 2 NT x @MOF-CoP), which is a bifunctional catalyst with low cost and high activity. We synthesize the Ti 2 NT x @MOF-CoP composite by phosphating the precursor ZIF-67 self-assembled with Ti 2 NT x MXene nanosheets. The Ti 2 NT x @MOF-CoP electrode shows competitive hydrogen evolution performance in a wide pH-range (current density of 10 mA cm −2 ) and has a low overpotential ( η ) of 112 mV in pH = 14 especially. The Ti 2 NT x @MOF-CoP electrode for OER also has a low η = 241 mV at 50 mA cm −2 . Based on the bifunctional activity of Ti 2 NT x @MOF-CoP in alkaline, we set a dual-electrode configuration for HER and OER. It has a bias of 1.61 V at 10 mA cm −2 , with impressive catalytic stability during a 20 h measurement. MOFs-derived CoP has a large specific surface area and strong catalytic activity. Ti 2 NT x as a novel member of the MXene family not only can increase the active sites, but also can improve the stability of heterojunction catalysts. It reveals that the Ti 2 NT x @MOF-CoP composite has great potential in hydrogen evolution and water oxidation, thus reducing carbon emissions and protecting the environment.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 8
·期 11
·2101-2107
·
IF 4.59
Ying Wang,Ran Du,Jinjie Qian,Yue Hu
Graphical Standing tall : Herein, a type of hierarchically ultra-fine CoP attached onto nanostructured CuO nanowire flowers (CuO NWF-CoP/CF) has been conveniently obtained by electrodeposition method, which exhibits outstanding oxygen evolution reaction activity with a small overpotential of 230 mV to achieve a current density of 50 mA cm −2 in 1.0 M KOH together with a satisfying long-term stability. The facile fabrication of high-performance and low-cost photo-/electro-catalysts for oxygen evolution reaction (OER) still presents a tough challenge. Herein, a type of hierarchically ultra-fine CoP attached to CuO nanowire flowers (CuO NWF-CoP/CF) has been obtained by a simple electrodeposition method. Due to the merits of the 3D hierarchical structure with large surface areas, rich active sites, and open-channels for effective gas diffusion, as-achieved CuO NWF-CoP/CF catalysts exhibit outstanding OER activity with an overpotential of 230 mV for OER to achieve a current density of 50 mA cm −2 in alkaline media. This work provides a novel method to prepare hierarchical self-supported electrocatalyst towards efficient water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Qixiao Gai,Xiaochun Zheng,Wenjun Liu,Quanli Dong,Yingying Wang,Renxi Gao,Shoutian Ren
Visible-light photocatalytic water splitting for hydrogen evolution has attracted tremendous attention in past decades, but it still suffers from low solar-hydrogen conversion efficiency. In this paper, two-dimensional (2D) CdS was synthesized by the hydrothermal method , and 2D CoP nanosheets were synthesized by successive hydrothermal, oxidation and phosphodation process. Then 2D-2D CdS–CoP photocatalysts were formed by ultrasonically dispersing the mixed solution of CdS and CoP, and their heterostructure was confirmed by transmission electron microscopy , X-ray photoelectron spectroscopy, fluorescence spectrometer and so on. CdS–CoP with 2% CoP loading amounts exhibits a maximum photocatalytic performance of 56.3 mmolg −1 h −1 under visible light irradiation , which is 11.3 times as high as bare CdS. The enhanced photocatalytic performance of CdS–CoP should be due to the following two points: (1) high catalytic activity of CoP; (2) highly efficient separation and transfer of electron-hole pairs photogenerated in CdS due to the synthesized 2D-2D heterostructure.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhijie Cui,Zhibo Yan,Jie Yin,Wenpin Wang,Mei-E Yue,Zhongcheng Li
Tailoring surface composition and coordinative environment of catalysts in a nano-meter region often influence their chemical performance. It is reported that CoP exhibits a low dissociation ability of H–OH, originating from the poor desorption of intermediate species. Herein, we provide a feasible method to construct P-Fe 2 O 3 -CoP nanosheets through a gas-phase phosphorization process. P doping induces the formation of interfacial structure between Fe 2 O 3 and CoP and the generation of defective structures. The resulting P-Fe 2 O 3 -CoP nanosheets afford high freshwater/seawater oxidation activity (250/270 mV@10 mA/cm 2 ) in 1 mol/L (M) KOH, which is even lower than commercial RuO 2 . Compared with CoP||CoP, P-Fe 2 O 3 ||P-Fe 2 O 3 , and Co 3 O 4 ||Co 3 O 4 , the assembled P-Fe 2 O 3 -CoP||P-Fe 2 O 3 -CoP exhibits the superior water/seawater electrolysis performance with 1.61/1.65 V@10 mA/cm 2 . The synergistic effect of P doping, defective structure, and heterojunction leads to high water oxidation efficiency and water splitting efficiency.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jing Peng,Yucheng Wu,Ning Long,Wei Shen,Yimin Jiang,Rongxing He,Ming Li
Designing efficient non-precious-metal bifunctional electrocatalysts is still challenging at present. Herein, the efficient Ce,F-Ni 2 P/CoP electrocatalyst for water splitting was successfully fabricated. As shown from the present investigation, the codoping of Ce and F in Ni 2 P/CoP induced the f-p-d gradient orbital coupling in the Ce-F-metal structural unit of the catalyst, significantly reducing the work function of the catalyst, which accelerated the reaction kinetics and improved the intrinsic catalytic activity. The catalyst exhibited the outstanding hydrogen evolution reaction (HER) activity in the full pH range and, especially in alkaline electrolyte, an ultra-low oxygen evolution reaction (OER) overpotential of 243 mV at 50 mA·cm −2 and an excellent HER overpotential of 88 mV at 10 mA·cm −2 were achieved. Moreover, Ce,F-Ni 2 P/CoP displayed an excellent overall water splitting (OWS) performance with η 10 = 1.52 V. DFT theoretical calculations also showed that the gradient orbital coupling resulted in the reduction of the work function of the catalyst. Our work provides a new understanding of designing and constructing high-performance catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Liang-Liang Zhang,Kai-Xuan Yang,Cai-Long Xue,Wan-Xi Li,Bo-Qiong Li,Yi-En Du,Yong-Qiang Chen,Ya-Jie Liu
The design of an active and sulfur-resistant catalyst for dibenzothiophene (DBT) hydrodesulfurization (HDS) in crude oil purification is highly desirable but remains a grand challenge. Here, two carbon-supported cobalt phosphide catalysts Co 2 P/C and CoP/C, and a reference sample Co/C are successfully synthesized using a metal–organic-frameworks (MOFs) precursor. A P/Co ratio dependence on crystal phases is found, leading to the formation of two pure-phase cobalt phosphide catalysts CoP/C and Co 2 P/C. Catalyst evaluation in HDS of DBT shows that the CoP/C catalyst exhibits a higher activity and stability than Co 2 P/C and Co/C, giving a 93.7 % DBT conversion with 100 h stability under 3 MPa and 380 ◦C. Moreover, a 67.4 % biphenyl yield characterizes the dominance of the direct desulfurization (DDS) pathway. The obtained catalytic performance over the CoP/C catalyst is also superior to the published cobalt phosphide catalysts. Multiple characterization techniques co-evidence that the copious specific surface area, efficient electron transport from Co to P, high thermal stability of Co nanoparticles (NPs), and strong sulfur resistance account for the enhanced catalytic performance of CoP/C. The findings of this report suggest that phosphorus-modified cobalt over the carbon support can act as a promising catalyst for the HDS of DBT.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 9
·5484-5493
·
IF 3.094
Changcun Han,Tong Zhang,Qijun Cai,Chonghao Ma,Zhengfu Tong,Zhifeng Liu
In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g-C 3 N 4 nanosheet photocatalysts by in situ chemical deposition. The built-in electric field formed by heterojunction interface of the CoP/g-C 3 N 4 composite semiconductor can accelerate the transmission and separation of photogenerated charge-hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g-C 3 N 4 formed a stable heterogeneous interface and effectively enhanced photogenerated electron-hole separation. UV-vis DRS analysis showed that the composite had enhanced visible light absorption than pure g-C 3 N 4 and was a visible light driven photocatalyst. In this process, NaH 2 PO 2 and CoCl 2 are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H 2 evolution rate of 3.0 mol% CoP/g-C 3 N 4 is about 15.1 μmol h −1 . The photocatalytic activity and stability of the CoP/g-C 3 N 4 materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.
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
ENERGY & FUELS
·
2022
·
IF 4.654
Baoshu Li,Jiping Li,Xixue Liu,Jinxue Guo,Yanfang Sun,Xiao Zhang
Exploring highly active catalysts with low-price materials is urgently needed for water-splitting electrolysis. Herein, selenium-doped CoP nanoneedles construct the grass-like structure, and the nanoneedles are vertically anchored on carbon cloth (Se–CoP/CC). Scanning electron microscopy and transmission electron microscopy reveal the nanoneedle array architecture of S–CoP, which is convenient for the adsorption of molecules on active centers. The small diameter of nanoneedles is beneficial for rapid charge transfer. X-ray photoelectron spectroscopy shows the electronic structure regulation of Se incorporation, which is beneficial for the optimized catalysis activity. Electrochemical tests show that Se dopants result in more catalysis sites and faster kinetics. Endowed with these advantages, good catalytic performance of the prepared sample for hydrogen evolution is disclosed, with low overpotentials of 47 mV at 10 mA cm–2 and 145 mV at 100 mA cm–2 in alkaline solution. This work highlights a promising way to improve the performance of transition-metal-based catalysts with non-metal-doping engineering toward water electrolysis application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiayi Chen,Xu Li,Bo Ma,Xudong Zhao,Yantao Chen
The inferior performance of non-precious metals on electrocatalytic hydrogen evolution can be mainly attributed to the inappropriate adsorption strength of intermediates. A core–shell heterostructure of CoP@Ni is developed by hydrothermal reaction, thermal phosphorization and subsequent electrodeposition, with metallic Ni supported by CoP nanowire array. The as-prepared CoP@Ni core–shell heterostructure nanowire array has a superior activity on hydrogen evolution in alkaline electrolyte, with an overpotential of 71 mV to drive 10 mA cm −2 and a Tafel slope of 66 mV dec -1 . The electronic structure of CoP@Ni is tuned for modulating the adsorption strength of intermediates. The theoretical calculations reveal that CoP@Ni has metallic characteristics with a zero-bandgap, which leads to the promoted charge transfer. More importantly, the intrinsic activity of CoP@Ni is greatly increased, with a lower energy barrier in the reaction pathway. This work points out the importance of constructing the heterostructure for improving the intrinsic activity, which can pave the way to the exploration of high-performance and cost-effective electrocatalysts for hydrogen production.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
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