JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 1
·768-772
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IF 1.798
Shen Yongzhen,Ren Xiaohui,Qi Xiang,Zhou Jie,Xu Guanghua,Huang Zongyu,Zhong Jianxin
Two-dimensional NiSe 2 nanosheets arrange on three-dimensional carbon cloths (CC) have been synthesized through a facile two-step hydrothermal process. The as-prepared NiSe 2 /CC photoelectrode demonstrates outstanding photoelectrochamical (PEC) performance. Subsequently, a series of characterization techniques including X-ray diffraction and Raman spectra are carried out and confirm a well crystalline NiSe 2 /CC. Additional morphological and microstructural tests depict large-scale NiSe 2 nanosheets are uniformly aligned on the basement of conductive carbon cloth. The PEC measurements show the steady photocurrent density can be effectively raised from 10 to 600 μA/cm 2 when bias potential increases from 0 to 0.5 V, which is proposed to be attributed to the adequate exposure of active sites and reduction of surface contact resistance provided by carbon cloth. The structure and performances of hydrothermal synthesized NiSe 2 /CC suggest promising applications in the field of PEC hydrogen production.
研究领域:
材料科学
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能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Junyu Gao,Hongqin Ma,Xinyue Luo,Luqi Yu,Xingpeng Gu,Jiahao Liu
Rational design of low-cost and highly-efficient electrocatalysts is vital for water electrolysis. To date, many works have proved that the electrocatalytic hydrogen evolution reaction (HER) activity of the transition metal chalcogenides (TMCs) can be enhanced by anion or cation doping. However, the effect of anion-cation dual-doping on improving the HER activity of TMCs catalysts is still questionable. Herein, we designed and synthesized a porous (Mo, N)-NiSe 2 /Nickel foam (NF) nanosheets array by simultaneous doping Mo and N into pyrite-type NiSe 2 . For (Mo, N)-NiSe 2 /NF, the incorporation of Mo could significantly increase the specific surface area and active sites of NiSe 2 catalyst, whereas N doping was primarily responsible for accelerating the intrinsic reaction kinetics as well as introducing new reactive sites of catalyst. As a result, the porous (Mo, N)-NiSe 2 /NF nanosheets array exhibited a low overpotential of 82 mV at 10 mA.cm −2 , a small Tafel slope of 84.5 mV.dec −1 , and a high C dl of 90.5 mF.cm −2 for HER. Furthermore, the results of “post-HER” XRD , HR-TEM, SEM and XPS demonstrated that the structure, composition and morphology of (Mo, N)-NiSe 2 /NF remained unchanged after 35 h constant current test. This work highlighted the importance of anion-cation dual-doping in boosting electrocatalytic HER activity of TMCs 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
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Yayun Zheng,Yunrui Tian,Shatila Sarwar,Jujie Luo,Xinyu Zhang
This work reports the fabrication of carbon nanotube (CNT) decorated NiSe 2 nanosheets (NiSe 2 @CNT) by a rapid microwave process in 2 min. Interestingly, NiSe 2 @CNT has a lamellar and tubular interwoven morphology. The specific capacitance of the prepared electrodes with different microwave conditions for supercapacitors were studied. Meanwhile, we compared the electrochemical performances of NiSe 2 @CNT with the presence of different amount of CNT. The optimal NiSe 2 @CNT electrode can demonstrate a high specific capacitance of 980.5 F g −1 at a current density of 1 A g −1 and good cycling stability of 82% retention after 9000 cycles at 5 A g −1 . In addition, an asymmetric supercapacitor was assembled by NiSe 2 @CNT as positive electrode and activated carbon (AC) as negative electrode , which successfully light four white light emitting diodes (LEDs) for 6 min with an energy density of 25.61 Wh kg −1 at a power density of 810 W kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Changyi Xu,Guimei Li,Wanchun Huang,Xiangyun Luo,Mengmeng Wei,Huan Wen,Yejin Li,Xiaokun Li,Youlin Zhang,Wei Chen
Developing low-cost, highly efficient and stable bifunctional electrocatalysts for overall water splitting is vital but still a challenge. Hetero-atom doping is an effective strategy to improve the catalytic activity of electrocatalysts by increasing active sites and regulating electronic structure. Here, Mo-doped NiSe 2 nanosheets were in situ grown on nickel foam (NF) by hydrothermal and the subsequent selenization process as bifunctional electrocatalysts for overall water splitting. Incorporation of Mo into NiSe 2 can regulate the electronic structure, increase the numbers of high-valence Ni 3+ and active sites, generate the disorder defects due to the formation of active material NiOOH, and decrease the charge transfer resistance. The above synergistic roles make the Mo-doped NiSe 2 to present superior catalytic performances and remarkable stability for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Under alkaline condition, the overpotentials of OER and HER are 210 mV and 172 mV at a current density of 10 mA cm –2 , respectively. Moreover, only a low cell voltage of 1.57 V is required to reach a current density of 10 mA cm –2 in a water splitting device assembled with the Mo-doped NiSe 2 as the anode and cathode. Therefore, this study opens up a new way for designing non-precious bifunctional electrocatalysts by Mo doping.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
B. Gayathri Manju,G. Rajkumar,P. Mathan Kumar,B. Muthuraaman,R. Harinivashini,P. Lalitha,K. Prabakaran,D. Balaji
Metal chalcogenides have garnered considerable interest for electronic applications owing to their high electrical conductivity, along with unique structural, optical, and electrochemical properties. In this work, NiSe 2 nanoflakes were synthesized via a simple, low-cost microwave-assisted method, followed by calcination at two different temperatures (200 °C and 400 °C) for 2 h. Structural characterization through X-ray diffraction (XRD) and Raman spectroscopy confirmed the successful formation of cubic-phase NiSe 2 at 400 °C. Detailed morphological and elemental analyses revealed that calcination temperature plays a pivotal role in tuning the nanoflake morphology and surface characteristics. The multifunctional behavior of the NiSe 2 nanoflakes was evaluated for both supercapacitor and solar cell applications. Electrochemical measurements demonstrated a high specific capacitance of 598 F/g at 0.5 A/g, while photovoltaic tests achieved a power conversion efficiency (PCE) of 5.0 %. These results highlight the potential of NiSe 2 nanoflakes as efficient electrode materials for integrated energy storage and conversion devices.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能量存储
·
光伏技术
✓ 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）