ACS Applied Nano Materials
·
2019
·
IF 0
Yaqi Jing,Haile Liu,Ruijuan Yan,Jing Chen,Haitao Dai,Changlong Liu,Xiao-Dong Zhang
Morphology and structure engineering are feasible routes to tuning the hydrogen evolution reaction (HER) catalytic activity of cobalt phosphides. In this work, we developed self-supported Zn-incorporated mesoporous cobalt phosphide nanowire arrays (Zn-Co-P) on Ni foam as an efficient HER electrocatalyst. Electrochemical tests show that the HER catalytic activity of Zn-Co-P has been improved by Zn incorporation and the measured overpotentials are 167 and 172 mV at a geometric catalytic current density of 100 mA·cm–2 in 0.5 M H2SO4 and 1.0 M KOH, respectively. Further characterizations reveal that the mesopores exposed on the surface induced by Zn incorporation play a key role in the enhanced HER performance of Zn-Co-P by providing more active sites. Moreover, Zn incorporation can promote the formation of a CoP phase, which is also beneficial to the overall catalytic activity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Han Zhang,Guan-Yu Ding,Afifa Yousaf,Li Chen,Xin-Long Wang,Guo-Gang Shan,Chun-Yi Sun,Zhong-Min Su
Luminescent sensors have received extensive attention due to their fast-response and easy-operation and when integrating multifunctions in a sensor, the cost will be reduced substantially. Covalent organic polymers (COPs) as multifunctional luminescent sensor with outstanding performance are still underexplored. In this work, a typical COP named as COP-2 show preponderant performance in the detection of Fe 3+ , MnO 4 − , and TNP. COP-2 has the highly efficient ability to selectively detect Fe 3+ among the other metal ions , and the limit of the detection (LOD) is 0.89 μ M, which outperforms the reported covalent organic materials. Anion sensing shows the COP-2 has the highly anti-interference ability and recyclicity to detect MnO 4 − . Explosive analogs sensing demonstrates that COP-2 owns the superior ability in sensing TNP in the knockdown concentration with 0.0067 ppm LOD, which superior to the values in the reported literature. In addition to the above superb sensing performance, COP-2 can be utilized as a white light-emitting diode (WLED) when combined with the commercial blue emission LED and presents a Commission Internationale de l’Eclairage (CIE) coordinate of (0.31, 0.32). These results show the COP-2 not only has an appealing performance in multifunctional luminescent sensing application, but also has a possible application in white light emitting.
研究领域:
材料科学
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化学传感
·
光学器件
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Kangli Chen,Zhichao Yu,Yuan Li,Wenfeng Wang,Lu Zhang,Shumin Han
Developing low-cost and high-performance catalysts instead of Pt-based noble metal materials for alkaline HER is essential for sustainable clean technologies. However, the high energy barriers of H 2 O dissociation and intermediate *H lead to the low efficiency and the difficultly of the alkaline HER. Herein, the hierarchical Al-CoP/Ni 2 P on Ni foam (Al-CoP/Ni 2 P@NF) was successfully prepared using interface and doping engineering strategies. The heterostructure, Al doping, and hierarchical morphology significantly improve the electronic configuration and the active surface area of the compound. Notably, the Al-doping compound exhibits excellent HER performance in 1.0 M KOH, achieving a current density of 10 and 20 mA cm −2 at 55 and 72 mV overpotential, respectively, with a Tafel slope of 55.6 mV dec −1 . As an overpotential of 72 mV is performed, the current density 20 mA cm −2 keeps unchanged for even 24 h in alkaline water electrolysis. DFT calculations further reveal that Al-induced partial electron redistribution of CoP/Ni 2 P, thereby optimizing Δ G H* and reducing the energy barriers of H 2 O dissociation.
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
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Wang Tingting,Wu Liqian,Xu Xiaobing,Sun Yuan,Wang Yuanqi,Zhong Wei,Du Youwei
The development of efficient, universal and inexpensive electrocatalysts for hydrogen evolution reaction (HER) is central to the area of sustainable energy conversion. Considering the Co-based sulfides/phosphides have the same catalytic mechanism with the hydrogenases occurring in nature. Here, a new catalyst based on Co 3 S 4 /CoP hybrid that is comprised entirely cheap and earthabundant elements, was first synthesized via a two-step method, the Co(CO 3 ) 0.5 (OH)·0.11H 2 O precursor was prepared by a hydrothermal method, followed by phosphidation and sulphidation under Ar atmosphere simultaneously. The resulting Co 3 S 4 /CoP hybrid material possessed porous core-shell structure with a homogeneous element distribution and large electroactive surface area (~21.04 mF cm −2 ). More importantly, the nanostructured Co 3 S 4 /CoP electrode exhibits excellent HER properties in acid medium with a low onset overpotential of 34 mV, a small Tafel slope of 45 mV dec −1 , as well as a large exchange current density of 150 μA cm −2 . These results obtained in this study indicate that the Co 3 S 4 /CoP hybrid nanorod is promising replacement to the Pt-based catalysts for H 2 production. Moreover, the synthetic method presented in this work can provide an efficient way to synthesis other nanocomposites.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Kangli Chen,Yuan Li,Guanjiu Wu,Qing Wang,Chenfeng Fan,Lu Zhang,Shumin Han
Doping hetero-atoms into non-noble metal phosphides is an important strategy for enhancement of hydrogen evolution reaction (HER) performance. Herein, we prepare a self-supported F-doped CoP/Ni 2 P nanowire arrays grown on Ni foam by using a strategy with three steps including hydrothermal reaction , fluorination , and low-temperature phosphorization. The F-CoP/Ni 2 P nanowire consists of a well-defined crystalline core and a thin amorphous surface layer. The F-doping and amorphous surface layers effectively expose a large number of active sites, optimize the electronic configuration of Ni, Co and P on the surface, and promote the electron transport performance. As a result, the prepared F-CoP/Ni 2 P@NF-II exhibits excellent electrocatalytic activity for HER in alkaline electrolyte with a lower overpotential of 75 mV at 10 mA cm −2 , a small Tafel slope of 54.8 mV dec −1 , and good durability. This work provides a simple method for developing transition metal phosphate-based catalysts towards hydrogen evolution reaction .
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Refrigeration
·
2021
·
IF 3.629
Zhenghao Jin,Shuhong Li,Runfa Zhou,Mengkai Xu,Weixue Jiang,Kai Du
The newly NH 3 – H 2 O – LiBr working fluid can decrease the power wasted in the generator, thus improves the COP of the ammonia absorption refrigeration system. But the applying of NH 3 – H 2 O – LiBr working fluid decreases the ammonia absorption efficiency, so the COP of the system is still unsatisfactory. To further enhance the COP of the NH 3 – H 2 O - LiBr absorption refrigeration system, TiO 2 nanoparticles are added to the NH 3 – H 2 O - LiBr working fluid in this study. And the effects of TiO 2 nanoparticles concentration on the performances of the generator, absorber, evaporator, condenser, and solution heat exchanger are tested in an ARS experimental system. The experimental results indicate that the addition of TiO 2 nanoparticles increases the P g , P e , P a , and P c , meaning that the value of ammonia produced in the generator increases. Therefore, the COP and iCOP of the system are improved by adding TiO 2 nanoparticles, and the COP is maximum improved by 18.96% compared with the ammonia-water absorption refrigeration system. When the x TiO2 is increased from 0.3% to 0.5%, the increase rate of the COP decreases because the newly added nanoparticles do not disperse well. So 0.3% is a better choice for the TiO 2 nanoparticles concentration when comprehensively considering the dispersion stability of nanoparticles and the COP.
研究领域:
工程热物理
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Jianzhi Wang,Jie Yang,Fuhua Huang,Yuru Li,Yu Luo,Yanan Xue,Ning Cai,Hui Li,Faquan Yu
The design of efficient, stable and cost-effective electrocatalysts for hydrogen evolution reaction holds substantial significance in water electrolysis, but it remains challenging. Tremella-like nickel-molybdenum bimetal phosphide encapsulated cobalt phosphide (NiMoP/CoP) with hierarchical architectures have been effectively synthesized on nickel foam (NF) via a straightforward hydrothermal followed by a low-temperature phosphating method. Based on the unique structural benefits, it significantly increases the number of redox active centers, enhances the electrical conductivity of materials, diminishes ion diffusion path lengths, thereby promoting the efficient electrolyte penetration and reducing the inherent resistance. The as-obtained NiMoP/CoP/NF electrocatalyst exhibited remarkable catalytic activity with a ultralow overpotential of 38 mV (10 mA cm-2) and low Tafel of slope (83 mV dec-1). The straightforward synthesis process and exceptional electrocatalytic properties of NiMoP/CoP/NF demonstrate great potential for HER to replace the precious metal catalyst.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Mengtian Zhang,Suqin Ci,Hao Li,Pingwei Cai,Huimin Xu,Zhenhai Wen
It is highly desirable to develop low-cost and highly-efficiency electrocatalysts toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for implementing full water splitting in developing a sustainable green energy system . Herein, we report a reliable and facile anion-exchange reaction strategy for conversion of one-dimensional (1D) Co 3 O 4 nanowires (NWs) into CoP porous nanowires (PNWs). Notably, such evolution process provides the as-formed CoP PNWs with significantly improved defect sites and thus endows the CoP PNWs with a high electrochemical activity surface area. Accordingly, the CoP PNWs exhibit outstanding catalytic activity toward HER and OER when serving as bifunctional electrocatalysts, achieving a current density of 10 mA cm −2 with low overpotentials of 147 and 326 mV for HER and OER, respectively. We demonstrate the water splitting electrolyzer with such CoP PNWs electrocatalyst as cathode and anode can be driven by a double A battery and a solar panel (1.5 V). The advantages, including facile and low-cost synthetic process, high activity for HER and OER, endow the as-developed CoP PNWs to be one of the most promising candidates for full water splitting system.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Zhang,Zhen Xin Hui,Hong Yu Zhou,Shi Feng Zai,Zi Wen,Jian Chen Li,Chun Cheng Yang,Qing Jiang
Design and fabrication of high-efficiency electrocatalysts for hydrogen evolution reaction (HER) in alkaline conditions are crucial to reduce energy losses in water-alkali and chlorine-alkali industry yet challenging. Herein, density functional theory simulations indicate that the Ga dopant could systematically enhance the HER activity of CoP by improving the H 2 O adsorption, weakening OH adsorption, and optimizing the H adsorption/desorption. Aided by these findings, we successfully prepared ultrathin Ga-doped CoP nanosheets (Ga-CoP NSs) self-supported electrode via electrodeposition followed by the phosphorization treatment for the first time. Ga-CoP NSs delivers superior HER electrocatalytic activities with a very low overpotential of 44 mV to drive a current density of 10 mA cm −2 , outperforming almost all non-noble metal based HER electrocatalysts 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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Lei Yang,Xuejie Cao,Xiaojun Wang,Qinglun Wang,Lifang Jiao
The interfacial synergy effect caused by the space charge transfer of heterojunctions can effectively modify the catalytic activity. Herein, a composite heterojunction catalyst of CoTe 2 /CoP with moderate Gibbs free energy of hydrogen adsorption is designed based on interfacial effects driven by work function difference between CoTe 2 and CoP. As expected, CoTe 2 /CoP only needs overpotentials of 80 mV at 10 mA cm −2 and stability for continuous catalysis at the current density of 100 mA cm −2 for 20 h in hydrogen evolution reaction (HER). The experimental results and theory calculations identify that the built-in field drives the transfer of electrons from CoTe 2 to CoP at the interface, which realizes electronic redistribution with increased electron density on the Co atoms in CoP and optimizes the adsorption-free energy of the reaction intermediates, thereby, accelerating HER kinetics. Besides, the CoTe 2 /CoP heterostructure also behaves the excellent catalytic activity towards water splitting.
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
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yuying Li,Shengxiong Liao,Yiming Gao,Dai Dang,Yuying Zheng,Fashen Chen
Developing highly efficient non-precious metal bifunctional catalysts remains a critical challenge in electrolytic water splitting research. In this study, we prepared Mn-doped CoP coupled with nitrogen-doped carbon nanocube (Mn–CoP/NC) catalysts using an in situ growth, low temperature oxidation, and phosphatization strategy. Due to the excellent activity of the cobalt species and the effective protection provided by the carbon shell to the metal core, these Mn–CoP/NC catalysts exhibited outstanding hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances. At a current density of 10 mA cm2, the overpotentials were as low as 90 mV for the HER and 272 mV for the OER. Moreover, the Mn–CoP/NC‖Mn–CoP/NC cell achieved a current density of 10 mA cm−2 at just 1.66 V and remained highly stable after 36 hours of continuous operation. This study offers a new strategy for designing efficient bifunctional catalysts for overall water splitting.
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 16
·3030-3038
·
IF 5.958
Liang Jiang,Ming Yan,Lin Sun,Yu Liu,Hongye Bai,Weidong Shi
Transition metal phosphides (TMPs) as advanced electrode materials for supercapacitors (SCs) have received great attention due to their excellent redox activity, high electrical conductivity and metalloid feature. In this work, we successfully synthesized hierarchical core–shell CoP/Ni2P nanosheets (NSs) on carbon paper through a facile deposition and phosphating method. The optimized hierarchical core–shell CoP@Ni2P nanosheet electrode shows a high specific capacitance of 2644 F g−1 at a current density of 1 A g−1. Meanwhile, three-dimensional (3D) α-Fe2O3 grown on carbon paper was also synthesized as a negative material by a hydrothermal and annealing treatment method, which manifests excellent performance of 539.2 F g−1 at 1 A g−1. Besides, an asymmetric supercapacitor (ASC) was assembled, using CoP/Ni2P nanosheets as the positive electrode and α-Fe2O3 as the negative electrode in 3 M KOH electrolyte, which exhibits an excellent energy density of 48.5 W h kg−1 at 793 W kg−1 and a capacity retention rate of 98.8% after 10 000 cycles. The excellent electrochemical performance and outstanding cycling stability of the asymmetric supercapacitor show its great potential application in future energy storage devices.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）