ELECTROCHEMISTRY COMMUNICATIONS
·
2016
·
IF 4.569
Xiaojuan Chen,Guangfeng Zeng,Taotao Gao,Zhaoyu Jin,Yajie Zhang,Hongyan Yuan,Dan Xiao
Electrochemical water splitting in an alkaline electrolyte for large-scale hydrogen production is currently a hot research topic. However, developing high-performance and durable oxygen-evolving electrocatalysts is an ongoing challenge. In this work we prepared Ni-phytate thin films with a bubble-like structure on Ni-foam through an in situ growth process. The resulting material can be used as an oxygen-evolving electrode in basic media without requiring the use of a conductive binder. The Ni-phytate electrode has high catalytic activity ( η j = 10 mA cm − 2 = 280 mV) and good stability (the current activity remained 95% after 5 h) towards OER. This is an effective approach to simplifying the large-scale preparation of catalysts for water-splitting applications.
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
Kang Ge,Yanwei Zeng,Guodian Dong,Longfei Zhao,Zhentao Wang,Ming Huang
The growing hydrogen consumption has greatly promoted the development of efficient, stable and low-cost electrocatalysts for the hydrogen evolution reaction (HER). Constructing functional nanostructures is an efficacious strategy to optimize catalytic performance. Herein, we present a feasible route to fabricate distinctive 3D grass-like cobalt phosphide nanocones clad with mini-vesicles on the hierarchically porous Ni foam, which can directly serve as a binder-free electrocatalyst with superior catalytic activity and durability in HER. Thanks to its distinctive 3D microstructure featured with favourable pore-size distribution, abundant active sites provided by mini-vesicles and rapid electron transfer with the assistance of Ni foam, the as-grown grass-like CoP/NF electrocatalyst has shown a favourable overpotential in an acidic solution with an onset overpotential of ∼35 mV, an overpotential of 71 mV at a current density of 10 mA cm −2 , reduced by 60 mV in comparison with that realized by urchin-like CoP/NF nanoprickles. Moreover, it has exhibited an excellent HER activity in the alkaline medium , with an overpotential of 117 mV at 10 mA cm −2 , a Tafel slope of 63.0 mV dec −1 and a long-term electrochemical durability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Honglong Qu,Tiantian Cao,Qiaolin Li,Gang Chen,Hongtao Guan,Chengjun Dong
Reasonably tuning the structure of Ni 2 P based complex electrode is decisive to boost its applications in supercapacitor. Herein, we demonstrate the design and preparation of NiMoO 4 @Ni 2 P nanosheet arrays with unique core–shell architecture on Ni foam (NF) for pseudocapacitor. The directly grown Ni–MOF on NF was used to couple with NiMoO 4 via an ion exchange between BDC 2− and MoO 4 2- , which is crucial to form a stable NiMoO 4 @Ni 2 P/NF core–shell structure during the subsequent phosphatization. The NiMoO 4 @Ni 2 P/NF electrode can deliver a high capacitance of 3655.1 mF cm −2 at 1 mA cm −2 with a remarkable cycling stability (95.35 % over 4000 cycles). Additionally, the assembled NiMoO 4 @Ni 2 P/NF–2//AC/NF device achieves a stable working voltage of 1.7 V and delivers a superior energy density of 0.155 m Wh cm −2 at a power density of 1.705 mW cm −2 . The outstanding performance of pseudocapacitor is mainly ascribed to the stable diffusion channel, rich reactive species and hetero–interface, enabling fast electrochemical reaction kinetics.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 3
·1-10
·
IF 0
Sun Xueying,Liu Xinjie,Wang Jie,Jiang Xusheng,Liu Rongmei,Li Anran,Li Wen
In this work, we first successfully loaded the MOF structure Co-HKUST nanobundles on a foamed nickel without adding any binder. The Co-HKUST is a pseudo-capacitive material with excellent electrochemical performance as a unique energy storage material. As an electro-active material, such cobalt-based MOF exhibits superior pseudo-capacitive behavior in the KOH aqueous electrolyte with a high specific capacitance of 578.6 F g −1 at 1 A g −1 , and the specific capacitance remains 452.3 F g −1 when the current density increased to 10 A g −1 with a good rate performance (78.2%). Meanwhile, the cycle retention rate of the Co-HKUST is 88.7% after 1000 cycles at 7.5 A g −1 . The two-electrode asymmetric supercapacitor (ASC) device is also assembled in this work. The specific capacitance of Co-HKUST//AC ASC is 200.5 F g −1 at 1 A g −1 . Though 5000 cycles at 5 A g −1 , only 8.2% of the capacitance is lost. Energy density of asymmetric Co-HKUST//AC device can reach 71.35 Wh kg −1 at 1 A g −1 with a power of 809.9 W kg −1 . More interestingly, even if the current density increased to 10 A g −1 , the energy density maintains 44 Wh kg −1 at power density of 8.5 kW kg −1 . The above test results can fully show that the synthesized Co-HKUST material is a promising energy storage material.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Lifei Zhi,Shushan Yao,Eezhuang Zhang,Mingang Zhang
Micro–nanostructured NiCo 2 O 4 with controllable in situ growth on foam nickel has been successfully realized by introducing different surfactants as soft templates. Herein, several self-supporting NiCo 2 O 4 /NF electrode materials with different dimensions, different morphologies, and excellent electrochemical properties were prepared. The effects of the surfactant type, structure, and reaction conditions on the morphologies, structures, and electrochemical properties of the materials were studied in detail. The results show that NiCo 2 O 4 materials can regulate the formation of flake and fibrous structures of different sizes using a linear anionic surfactant. With the increase in temperature, the cationic surfactant (DMHAC10) can regulate the formation of flake → cactus → fibrous structure. Also, the Gemini cationic surfactant (GC-A) can regulate the formation of flake → cactus ball → urchin-like → fibrous structure. The growth of NiCo 2 O 4 on NF was prevented due to nonionic surfactants. Counter ions only affect the size of the material structure, but the material morphology is unaffected, and the surfactant concentration slightly affects the material morphology. The results of the electrochemical properties showed that the cactus ball NiCo 2 O 4 /NF material of a three-dimensional multistage structure was prepared by adding GC-A at 120°C for 6 h. The prepared material has excellent electrochemical properties such as higher specific capacity (4.74 F/cm 2 ), better charge–discharge ratio, and better cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 37
·e202403487
·
IF 1.9
Fang Wu,Yuhong Jiao,Jin-Long Ge,Chao Feng,Zhong Wu,Yujun Zhu,Qiu Li
Graphical Three different nickel sulfides on nickel foam were fabricated via a simple sulfuring the as-formed Ni-MOF/NF with different sulfides as the sulfur source especially MOFs derived Ni-MOF/NF-SS exhibits superior OER performance. Developing low-cost and exceedingly efficient electrocatalysts for oxygen evolution reaction (OER) is vital for application of hydrogen production from water splitting. Herein, three different nickel sulfides on nickel foam were fabricated via a simple sulfuring the as-formed Ni-MOF with different sulfide as the sulfur source. The effect of sulfur source on OER performance, morphology and structure of the as-prepared product are well discussed. The optimized Ni-MOF/NF-SS deliver overpotentials of 253 and 330 mV to reach current densities of 10 and 100 mA cm −2 with a small Tafel slope of 70.9 mVdec −1 , and stability of over 50 h. This work provides insights into the relationship between the OER activity and the structures of nickel sulfides, but also affords a new route to fabricate nickel sulfides-based electrocatalysts for OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 7
·5305-5315
·
IF 4.6
Zhaojun Tan,Shuaihui Guo,Wen Wang,Gang Li,Zhenwei Yan
Precise catalyst design is essential in the electrolysis of water to deliver clean energy, where the challenge is to construct highly active sites at the electrocatalyst interface. In this study, CoPVP/NFF (NiFe foam) and Mo–CoPVP/NFF precursors were synthesized sequentially in a hydrothermal procedure using NiFe foam as substrate with the ultimate formation of a NiFeCoMoS/NFF electrocatalyst by vulcanization at 350°. The NiFeCoMoS/NFF system exhibits a complex 1D–2D–3D composite structure with 1D nanoparticles attached to a 2D nano-paper on the surface of the 3D NiFe foam. The overpotentials associated with hydrogen and oxygen evolution by NiFeCoMoS/NFF are 123 mV and 245 mV, respectively, at a current density of 10 mA cm−2. A three-electrode system using NiFeCoMoS/NFF as working and counter electrode has been assembled that can generate current densities of 100 mA cm−2 at voltages of 1.87 V. Theoretical (DFT) calculations have shown that NiFeCoMoS/NFF exhibits favorable H adsorption energetics and a low OER reaction barrier. This study has identified a viable means of enhancing the efficiency of water electrolysis by regulating catalyst surface structure.
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
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 28
·14639-14645
·
IF 8.867
Qiang Zhao,Dazhong Zhong,Lin Liu,Dandan Li,Genyan Hao,Jinping Li
Electrochemical hydrogen production through water splitting is one of the most promising methods for the storage and utilization of renewable energy. However, it is hindered by the sluggish oxygen evolution reaction (OER). Therefore, there is an urgent need to develop an efficient and robust OER catalyst through a simple and low-cost method. Herein, we report the in situ fabrication of amorphous Fe–NiSe/NF without a polymeric binder as a three-dimensional (3D) nanowire electrode for efficient water oxidation. It shows good durability in 1 M KOH. This catalyst requires overpotentials of only 233 and 275 mV to drive current densities of 10 and 100 mA cm−2, and it shows a low Tafel slope of 48 mV dec−1. The faradaic efficiency of Fe–NiSe/NF for oxygen evolution was determined to be close to 96.8%.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guoguo Wang,Qiuyue Chen,Jing Zhang,Xuguang An,Qian Liu,Lisi Xie,Weitang Yao,Xunping Sun,Qingquan Kong
As an eco-friendly and sustainable strategy, the electrochemical reduction of nitrite (NO 2 – ) can simultaneous generation of NH 3 and treatment of NO 2 – contamination in the environment. Herein, monoclinic NiMoO 4 nanorods with abundant oxygen vacancies self-supported on Ni foam (NiMoO 4 /NF) are considered high-performance electrocatalysts for ambient NH 3 synthesis by reduction of NO 2 − , which can deliver an outstanding yield of 18089.39 ± 227.98 μg h −1 cm −2 and a preferable FE of 94.49 ± 0.42% at −0.8 V. Additionally, its performance remains relatively stable during long-term operation as well as cycling tests. Furthermore, density functional theory calculations unveil the vital role of oxygen vacancies in promoting nitrite adsorption and activation, ensuring efficient NO 2 – RR towards NH 3 . A Zn-NO 2 – battery with NiMoO 4 /NF as the cathode shows high battery performance as well.
研究领域:
电催化
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Shijie Wang,Shenghan Zhang,Zhenye Zhang,Yu Tan,Kexin Liang,Xinliang Guo,Xuhui Kong
Nitrogen heterocyclic organics are promising hydrogen storage carriers with the advantage of being capable of large-scale transportation over long distances using existing oil and gas facilities. However, traditional methods for the hydrogenation and dehydrogenation of organic hydrogen carriers usually require high temperature and pressure conditions and external hydrogen supplies, which hinder their large-scale applications, as well as having certain safety risks. In this paper, a reversible electrochemical hydrogen storage system using quinoxaline as a hydrogen carrier was developed with potential for use at room temperature and atmospheric pressure. Experiments revealed that the hydrogenation conversion of quinoxaline reached 95% within 120 min at −0.20 V vs. RHE, and the dehydrogenation conversion of 1,2,3,4-tetrahydroquinoxaline reached 100% within 30 min at 1.30 V vs. RHE. This means that the system achieved quick and efficient reversible hydrogen storage. The Pd/NF dual-function electrode prepared by spontaneous redox reaction still showed high catalytic activity after 8 cycles, indicating its good long-term stability. The proton donor in the electrochemical hydrogenation process of quinoxaline was water, which completely eliminates the safety risk from the use of external hydrogen. This work provides a simple and reliable strategy for efficient hydrogen storage using nitrogen heterocyclic organics.
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
CATALYSIS SURVEYS FROM ASIA
·
2021
·Vol. 25
·期 4
·437-444
·
IF 3.106
Cao Ding,Dong Yingying,Tang Ying,Ye Yaoyao,Hu Shui,Guo Zhenguo,Li Xinhua
A facile and efficient electrocatalyst for hydrogen evolution reaction (HER) to produce hydrogen is very important for future energy. In this paper, amorphous manganese–cobalt nanosheets are successfully prepared by electrospinning on a foamed nickel substrate. It is found that the manganese (Mn) introduction in manganese–cobalt composites can simultaneously enhance their electrocatalytic performances. As a result, benefitting from the 3D structure, the self-supported Mn–Co hydroxides exhibits unprecedented HER activity with a relatively low overpotential of 100 mV at 10 mA cm −2 and has a possibility for the large-scale production of hydrogen. Graphic Abstract Amorphous PVP/Mn 4 Co nanofibers formed by electrospinning on Ni foam (NF) has remarkable catalytic activity and stability for HER after operation for 6 h in 1 M KOH, with a low overpotential of 0.1 V at 100 mA cm −2 , a low Tafel slope of 65.4 mV dec −1 .
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Green Processing and Synthesis
·
2024
·Vol. 13
·期 1
·
IF 3.8
Bo Yu,Yan Li,Xiang-Nan Fu,Lei Yu,Hu-Dai Fu,Yan-Xin Cao,Zhi-Hong Chen
The energy and environmental crisis pose a great challenge to human development in the 21st century. The design and development of clean and renewable energy and the solution for environmental pollution have become a hotspot in the current research. Based on the preparation of transition metal phosphates, transition metals were used as raw materials, Prussian blue-like NiFe(CN) 6 as a precursor, which was in situ grown on nickel foam (NF) substrate. After low temperature phosphating treatment, a bimetallic phosphide electrocatalyst (NiFe) 2 P/NF was prepared on NF substrate. Using 1 mol·L −1 KOH solution as a basic electrolyte, based on the electrochemical workstation of a three-electrode system, the electrochemical catalytic oxygen evolution performance of the material was tested and evaluated. Experiments show that (NiFe) 2 P/NF catalyst has excellent oxygen evolution performance. In an alkaline medium, the overpotential required to obtain the catalytic current density of 10 mA·cm −2 is only 220 mV, and the Tafel slope is 67 mV·dec −1 . This is largely due to: (1) (NiFe)2p/NF nanocatalysts were well dispersed on NF substrates, which increased the number of active sites exposed; (2) the hollow heterostructure of bimetallic phosphates promotes the electron interaction between (NiFe) 2 P and NF, increased the rate of charge transfer, and the electrical conductivity of the material is improved; and (3) theoretical calculations show that (NiFe) 2 P/NF hollow heterostructure can effectively reduce the dissociation barrier of water, promote the dissociation of water; furthermore, the kinetic reaction rate of electrocatalytic oxygen evolution is accelerated. Meanwhile, the catalyst still has high activity and high stability in 30 wt% concentrated alkali solution. Therefore, the construction of (NiFe) 2 P/NF electrocatalysts enriches the application of non-noble metal nanomaterials in the field of oxygen production from electrolytic water.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 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）