NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9887-9893
·
IF 3.3
Yao Tang,Zijun Zou,Xingen Wu,Pengfei Zuo,Lei Wang,Guiwen Huang,Jia Zhu,Shengliang Zhong
Designing highly efficient non-precious metal electrocatalysts to facilitate overall water decomposition is critical and highly desirable, but still challenging. In this study, we synthesized ZIF-67@POM nanomaterials by doping H3PMo12O40 in ZIF-67. The molybdenum-doped carbon matrix can effectively reduce CoP agglomeration, which is conducive to improving the specific surface area and active sites of the catalyst. The doping of Mo also optimizes the electronic structure of Mo-CoP-100 and improves its electrocatalytic activity. Compared with CoP derived from pristine ZIF-67, the optimal Mo-CoP-100 exhibits significantly enhanced oxygen evolution reaction (OER) catalytic activity with an almost constant overpotential of 290 mV to maintain a stable current density of 10 mA cm−2 in alkaline media for at least 100 h. Furthermore, compared with traditional precious metal-free OER electrocatalysts, the Mo-CoP catalysts prepared in this work have high specific surface area, rich surface-active sites, good cycling stability and high diffusion efficiency.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125402
·
IF 3.551
Tianyun Chen,Rongrong Zhang,Bo Ye,Qinghua Yang,Huajian Xu,Lei Zheng,Longgang Wang
In this work, a cerium doped CoP nanoparticles (NPs) embedded in carbon nanotubes (CNTs) for efficient and durable hydrogen evolution was developed. The detailed preparation process was described as the followings. First, cerium was introduced into ZIF-67 to form Ce-doped ZIF-67 by a joint nucleation method. Then, the Ce-doped Co-CNTs was synthesized by carbonization of Ce-doped ZIF-67. During the process, the Co2+ was reduced to form Co NPs and the elegant nanostructure of CNTs was formed by the catalytic effect of Co NPs. Finally, by using Ce-doped Co-CNTs as the precursor, the target catalyst (Ce0.05-doped CoP CNTs) was obtained through a chemical vapour deposition (CVD) process in the presence of NaH2PO2. Results of the transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the target catalyst maintained the original rhombic dodecahedron morphology of ZIF-67 and the CoP NPs were embedded in CNTs and distributed uniformly throughout the catalyst. In electrochemical measurements, the catalyst showed the best performance for HER in 0.5 M H2SO4 solution. The onset potential, Tafel slope, electron transfer resistance (Rct) and double-layer capacitance (Cdl) of the target catalyst was 49 mV, 78 mV dec−1, 19.2 Ω and 10.5 mF cm−2, respectively. Meanwhile, the catalyst yielded a current density of 10 mA cm−2 merely at an overpotential of 146 mV. Furthermore, it maintained 90% of the original current density in a chronoamperometry measurement and showed no obvious decay even after 2000 cycles scans in a long-term durability test.
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Wei Li,Shu-ao He,Qiong Ma,Xiao Wang,Chen-hui Zhao
In this research, the magnetic mesoporous silica microspheres with double-cavity structure (DHFS) were first synthesized by combining the hydrothermal technique, sol-gel hydrolysis and chemical etching method, then the BiOCl-CoP-x (BC-x, x = 1, 2, 3) heterojunctions were fabricated on the surface of the amino-functionalized DHFS microspheres. The morphologies, crystal characteristics, compositions and photoelectrochemical properties of the samples in different stages were characterized by various technologies. Furthermore, methylene blue (MB), as the targeted organic pollutant, was used to study the enriching property and activity of the photocatalysts by the corresponding adsorption and degradation experiments. Research showed that the introduction of the DHFS microspheres could significantly enhance the adsorption ability of the photocatalyst for the existence of concentration gradient effect of the mesoporous and double-cavity structure, so that the DHFSBC-2 possessed the most superior activity under visible-light illumination (VLI) for the effective fabrication of heterojunction interfaces between BiOCl and CoP NPs. More importantly, this photocatalyst exhibited very strong photo-stability, and no decrease of the photocatalytic activity could be observed after being recycled for several times.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 22
·15031-15040
·
IF 3.9
Linhua Wang,Hua Yang,Lulan Wang,Yunwu Li,Wenning Yang,Xu Sun,Lingfeng Gao,Mingyu Dou,Dacheng Li,Jianmin Dou
The inexpensive and highly efficient electrocatalysts toward oxygen evolution reaction (OER) in water splitting electrolysis have displayed promising practical applications to relieve energy crisis. Herein, we prepared a high-yield and structurally regulated bimetallic cobalt-iron phosphide electrocatalyst by a facile one-pot hydrothermal reaction and subsequent low-temperature phosphating treatment. The tailoring of nanoscale morphology was achieved by varying the input ratio and phosphating temperature. Thus, an optimized FeP/CoP-1-350 sample with the ultra-thin nanosheets assembled into a nanoflower-like structure was obtained. FeP/CoP-1-350 heterostructure displayed remarkable activity toward the OER with a low overpotential of 276 mV at a current density of 10 mA cm−2, and a low Tafel slope of only 37.71 mV dec−1. Long-lasting durability and stability were maintained with the current with almost no obvious fluctuation. The enhanced OER activity was attributed to the presence of copious active sites from the ultra-thin nanosheets, the interface between CoP and FeP components, and the synergistic effect of Fe–Co elements in the FeP/CoP heterostructure. This study provides a feasible strategy to fabricate highly efficient and cost-effective bimetallic phosphide electrocatalysts.
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
Nano Research
·
2016
·Vol. 10
·期 2
·595-604
·
IF 8.893
Cui Liang,Xu Yuanhong,Niu Li,Yang Wenrong,Liu Jingquan
The issues of hydrogen generation and storage have hindered the widespread use and commercialization of hydrogen fuel cell vehicles. It is thus highly attractive, but the design and development of highly active non-noble-metal catalysts for on-demand hydrogen release from alkaline NaBH 4 solution under mild conditions remains a key challenge. Herein, we describe the use of CoP nanowire array integrated on a Ti mesh (CoP NA/Ti) as a three-dimensional (3D) monolithic catalyst for efficient hydrolytic dehydrogenation of NaBH 4 in basic solutions. The CoP NA/Ti works as an on/off switch for on-demand hydrogen generation at a rate of 6,500 mL/(min·g) and a low activation energy of 41 kJ/mol. It is highly robust for repeated usage after recycling, without sacrificing catalytic performance. Remarkably, this catalyst also performs efficiently for the hydrolysis of NH 3 BH 3 .
研究领域:
材料科学
·
催化
·
能源存储
·
氢燃料电池
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wenyue Jiang,Bingxin Zhao,Ziting Li,Peng Zhou,Yuxin Zhao,Xiaoshuang Chen,Jinping Wang,Rui Yang,Chunling Zuo
The investigation of cost-effective and highly efficient electrocatalysts for alkaline water and simulative seawater oxidation is essential to the conversion and storage of renewable energy . In this paper, the Ce–NiSe 2 /CoP catalyst with multihole and ultrathin nanosheet structure is generated. The unique structural characteristics of Ce–NiSe 2 /CoP heterojunction nanosheets contribute the excellent OER performance under different alkaline 1 M KOH and simulated seawater (1 M KOH + 0.5 M NaCl) electrolytes. Specifically, this catalyst exhucture is generated. The unique structural characteristics of Ce–NiSe 2 /CoP heterojunction nanosheets conibits the low overpotentials of 287 and 304 mV at the current density of 10 mA cm −2 , along with the Tafel slopes of 87.1 and 78.8 mV dec −1 in two solutions, respectively. Moreover, the Ce–NiSe 2 /CoP target product also displays good stability. The present study introduces a promising strategy for the advancement of high-performance electrocatalysts in green energy field.
研究领域:
材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Huihua Wang,Jinhong Wu,Siwei Guo,Haosen Chen,Ruiqi Guo,Ding Huan,Deyong Wang,Wenchang Li,Xianglong Li,Dong Hou
Engineering interface, regulating morphology, and doping heteroatoms are regarded as effective strategies for boosting the electrocatalytic performances of transition-metal phosphides (TMPs), while still encounter some challenges to obtain desirable stability and sustaining catalytic activity. Herein, the Fe-CoP/Ni 2 P@NC/CC-350 self-supported electrode was successfully synthesized via pyrolysis of FeNi/ZIF-67/CC precursors followed by phosphating. In this structure, Fe-doped CoP and Ni 2 P composite nanoparticles are uniformly confined in the porous carbon matrix and anchored firmly on the surface of carbon cloth (CC). Moreover, the flocculent-like Fe-CoP/Ni 2 P@NC/CC-350 demonstrates superhydrophilicity to significantly facilitate mass transfer, while the unique morphology originates from a facile strategy of soaking ZIF-67/CC in the mixed solution composed of FeSO 4 and NiSO 4 . The synthesized Fe-CoP/Ni 2 P@NC/CC-350 integrates the advantages of abundant active sites, confinement effect, interface regulation and superhydrophilicity, thereby demonstrating superior HER and OER activities and stabilities in an alkaline medium (1.0 M KOH). Remarkably, Fe-CoP/Ni 2 P@NC/CC-350 electrodes used both as anode and cathode require a cell voltage of only 1.49 V at 10 mA cm −2 , much lower than that of the well-established 20 % Pt-C/CC and RuO 2 /CC couple (1.612 V). Besides, Fe-CoP/Ni 2 P@NC/CC-350 Fe-CoP/Ni 2 P@NC/CC-350 system exhibits an outstanding stability for monitoring water splitting up to 100 h at 10 mA cm −2 . DFT results further confirm that the heterointerface and Fe doping in Fe-CoP/Ni 2 P@NC/CC-350 lead to a upshift d-band center of active sites and decreased reaction Gibbs energy barrier for the rate-determining step during catalysis, thereby contributing to the superior HER and OER activities. The work provides a novel strategy to construct a superhydrophilic microstructure, and the synergistic effect of electrons originating from the heterointerface and doping paves the way for designing electrocatalysts with high activities toward water splitting.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xingchen Gao,Kaixin Lu,Jianjun Chen,Jie Min,Deliang Zhu,Manlin Tan
The design and manufacture of effective non-noble metal catalysts for the H 2 evolution reaction (HER) are urgent for realizing a cost-effective hydrogen production . We report herein on flower-like structures consisting of NiCoP–CoP heterostructural nanowires grown directly on the hierarchically porous nickel framework (NiCoP–CoP/Ni/NF) to achieve a highly efficient HER in alkaline solution (1.0 M KOH). The NiCoP–CoP/Ni/NF is synthesized by electrodeposition of porous Ni layers on Ni foam, followed by simple hydrothermal reaction and phosphorization. For HER, the binder-free NiCoP–CoP/Ni/NF electrode can reach 10 mA cm −2 current density at a quite low overpotential of 49 mV, because of the combination of porous Ni layers and highly active NiCoP–CoP nanowires. In addition, the NiCoP/CoP heterostructures exhibited remarkable stability under the long-term durability test. This work provides a new strategy that combines electrodeposition and hydrothermal reaction to synthesize effective HER 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
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Tan Dang,Donghai Wei,Guiqing Zhang,Lei Wang,Qinggang Li,Huaizhi Liu,Zuoying Cao,Guanhua Zhang,Huigao Duan
Rational design of highly active electrode materials made of low-cost and earth-abundant transition metal phosphides is essential to boost the energy density and overall performance of electrochemical capacitors. In this work, homologous 3D NiCoP/CoP hetero-nanosheets network supported on N-doped carbon nanotubes are synthesized through one-step phosphorization of nickel cobalt hydroxide. The synergistic effects between NiCoP and CoP in the heterointerface are studied systematically through tuning the molar ratio of original Ni/Co. As a result, the optimized N-CNTs@NiCoP/CoP (with the Ni/Co ratio of 1:2) reveals a remarkable specific capacity of 152 mAh g −1 at 1 A g −1 and a superior rate capability with a capacity retention of 61% even at 30 A g −1 . A hybrid supercapacitor assembled with N-CNTs@NiCoP/CoP cathode and ZIF-67-derived porous carbon anode exhibits a high energy density of 45.5 Wh kg −1 at power density of 784 W kg −1 and excellent stability of 87% retention after 10,000 cycles at 12 A g −1 . Such excellent electrochemical performance of N-CNTs@NiCoP/CoP is mainly ascribed to the strong synergistic effect between NiCoP and CoP in their heterojunctions, enlarged surface area and active sites due to the 3D nanosheets network and conductive N-CNTs support.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinxiu Qian,Fan Yang,Hongchen Liu,Guohua Li,Siyuan Sun,Xiaoyun Zhang,Guang Ma,Jiating Cheng,Mingjie Li,Ni Wu,Xi Li,Yongfeng Li
Achieving efficient production of hydrogen and obtaining high value-added products can maximize energy efficiency, but challenging. Herein, a nanoarray-structured heterojunction catalyst (CoP-MoO 2 /NF) was proposed as a potent bifunctional electrocatalyst for hydrogen evolution reaction (HER) and 5-hydroxymethylfuran oxidation reaction (HMFOR). Density Functional Theory (DFT) showed that heterojunction enhanced the adsorption of reactants on the electrocatalyst surface, the CoP-MoO 2 /NF exhibits excellent HER activity with an overpotential of 37 mV and a Tafel slope of 43 mV·dec −1 at 10 mA·cm −2 . Also, nearly 100% HMF conversion and 98.6% FDCA selectivity demonstrate the favorable performance of the material toward HMFOR. The work here shows a way for producing hydrogen in the future that is low-cost, efficient, reliable and also adds value to the final product.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8271-8276
·
IF 3.925
Ying-Xia Du,Lian Liu,Yong-Ke Li,Rui Liu,Wang-Ting Lu,Ji-Xiang Wang,Geng Zhang,Fei-Fei Cao
The preparation of two-dimensional (2D) composite material consisting of an active metal-based phase and carbon matrix is still a challenge. Herein, the 2D bimetal Co-TCPP(Fe) metal–organic framework (MOF) is synthesized and then adopted as the precursor to prepare a 2D composite electrocatalyst for the oxygen evolution reaction (OER). After carbonization and phosphorization, the 2D MOF is transformed into a composite nanoplate formed by Fe-doped CoP nanoparticles and a carbon matrix (Fe-CoP/C). This Fe-CoP/C composite exhibits a favorable OER performance in 1 M KOH with a low overpotential of 290 mV at 10 mA cm−2, which is better than that of counterparts without Fe and 2D morphology. The in situ formed metal (oxy)hydroxide is considered to be the main active species for the OER. The improved OER performance of Fe-CoP/C could be attributed to the Fe-doping in Co (oxy)hydroxide as well as the high electrochemical surface area induced by the 2D nanoplate morphology and conductive carbon network.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·972-977
·
IF 8.897
Wen Guilai,Liang Jie,Liu Qian,Li Tingshuai,An Xuguang,Zhang Fang,Alshehri Abdulmohsen Ali,Alzahrani Khalid Ahmed,Luo Yonglan,Kong Qingquan,Sun Xuping
Industrial-scale ammonia (NH 3 ) production mainly relies on the energy-intensive and environmentally unfriendly Haber-Bosch process. Such issue can be avoided by electrocatalytic N 2 reduction which however suffers from limited current efficiency and NH 3 yield. Herein, we demonstrate ambient NH 3 production via electrochemical nitrite (NO 2 − ) reduction catalyzed by a CoP nanoarray on titanium mesh (CoP NA/TM). When tested in 0.1 M PBS (pH = 7) containing 500 ppm NO 2 − , such CoP NA/TM is capable of affording a large NH 3 yield of 2,260.7 ± 51.5 µg·h −1 ·cm −2 and a high Faradaic efficiency of 90.0 ± 2.3% at −0.2 V vs. a reversible hydrogen electrode. Density functional theory calculations reveal that the potential-determining step for NO 2 − reduction over CoP (112) is *NO 2 → *NO 2 H.
研究领域:
化学工程
·
电化学
·
催化
·
材料科学
✓ 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）