Journal of Energy Chemistry
·
2020
·
IF 7.216
Yan Lin,Kaian Sun,Xiaomeng Chen,Chen Chen,Yuan Pan,Xiyou Li,Jun Zhang
The hydrogen evolution reaction (HER) via water electrolysis has gained immense research attention. Seawater electrolysis provides great opportunities for sustainable energy production, but is extremely challenging. Transition metal phosphides are promising candidate electrocatalysts. Herein, we prepared a novel Fe–Co 2 P bundle of nanorods (BNRs) for catalyzing the HER in seawater electrolysis and over the entire pH range. Cobalt phosphides with different crystal phases and morphologies were obtained by varying the Fe doping amount. The Co:Fe molar ratio of 1:0.5 was found to be optimum. The Fe doping improved the HER performance of Co 2 P over the entire pH range by providing favorable electronic properties and morphology, lattice distortion, and special coordination environment. The Fe-Co 2 P BNRs showed higher catalytic activity than 20% Pt/C in seawater at high potentials. The density functional theory calculations revealed that the Fe doping reduced the hydrogen binding strength of Co 2 P to efficiently accelerate the HER kinetics and produce a favorable charge density. This study provides valuable insights into the design and development of high-efficiency HER catalysts for large-scale seawater electrolysis.
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
Journal of Energy Chemistry
·
2019
·
IF 5.162
Wenzhi Tian,Wenzhe Ma,Zhenyu Feng,Fang Tian,Haibo Li,Jing Liu,Shenglin Xiong
Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications. Herein, a facile self-template strategy is applied to prepare Fe 7 Se 8 architectures with a monolithic structure via a self-synthesized single precursor and subsequent calcination at high temperature. With the support of oleylamine, the precursor is structurally targeted to engineer the Fe 7 Se 8 microstructure, featuring nanorod bundles arranged along the longitudinal direction . Because of their ordered hierarchical structure, the Fe 7 Se 8 nanorod bundles deliver a high reversible capacity of 300 mAh g −1 at 0.5 A g −1 , along with exceptional rate capability up to 20 A g −1 and long-term cycle life over 8000 cycles, which represents the highest stability of Fe 7 Se 8 anodes for sodium-ion batteries reported to date. The feasibility of the present strategy to prepare metal selenide structures highlights its promising potential for the rational and effective engineering of electrode materials responsible for the electrochemical performance of energy storage systems .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Rui Gao,Xiaoli Cheng,Shan Gao,Xianfa Zhang,Yingming Xu,Hui Zhao,Lihua Huo
It is very necessary to quickly and selectively detect the abused drugs in real time, because of their bad influence on the central nervous system. So ZnO nanorod bundles were prepared by simple hydrothermal reaction combined with calcination in this paper, which were assembled into thick film gas sensor to detect three analogs of drugs. Such ZnO nanorod bundles gas sensor exhibited not only good gas response and selectivity , but also good reproducibility and stability to the saturated vapors of three kinds of drugs (C 10 H 15 NO, C 9 H 13 NO, C 8 H 9 NO 2 ) at 252 °C. The excellent gas response can be ascribed to its rough surface and the large number of holes formed by nanorod bundles accumulation, which are conducive to diffusion , adsorption and desorption of gas molecules on ZnO nanorods. The reaction mechanism was further analyzed and discussed by XPS.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37631-37642
·
IF 3.361
Kanjun Sun,Fengting Hua,Shuzhen Cui,Yanrong Zhu,Hui Peng,Guofu Ma
A novel asymmetric supercapacitor (ASC) is assembled on the basis of an inerratic hexagonal-like WO3 nanorod bundle as a negative electrode and graphene-like alfalfa-derived porous activated carbon (APAC) as the positive electrode in 1 M H2SO4 aqueous electrolyte. The WO3 nanostructures prepared at pH of 1.6, 1.8, 2.0, 2.5 and 3.0 display hexagonal disc-like, nanorod bundle, inerratic hexagonal-like, sphere-like, and needle-shaped nanorod morphology. WO3-2.0, which was prepared at a pH of 2.0, exhibits high specific capacitance (415.3 F g−1 at 0.5 A g−1). APAC-2, which had the mass ratios of dried alfalfa and ZnCl2 as 1 : 2, showed a 3D porous structure, large surface area (1576.3 m2 g−1), high specific capacitance (262.1 F g−1 at 0.5 A g−1), good cycling stability with 96% of initial specific capacitance after 5000 consecutive cycles. The ASC assembled with WO3-2.0 and APAC-2 exhibits high energy density (27.3 W h kg−1 at a power density of 403.1 W kg−1), as well as good electrochemical stability (82.6% capacitance retention after 5000 cycles). Such outstanding electrochemical behavior implies that the electrode materials are promising for practical energy-storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）