简单稳定的过渡金属硫化物的合成及其生长机理的阐明对于开发催化剂,金属空气电池和其他技术具有重要意义。在这项工作中,我们开发了一种简单的水热方法来成功合成NiS 2微球。通过改变实验参数,详细研究和讨论了影响纳米结构球形成的原因,并创新性地提出了微球的形成机理。此外,电化学测试结果表明,7 h-NiS 2催化剂在1.0 M KOH中的10 mA cm -2下具有311 mV的过高的析氧反应(OER)活性,优于贵金属RuO 2。NiS 2催化剂还显示出坚固的耐久性。这项工作将有助于合理设计和理解用于多种能量转换技术的过渡金属硫属化物电催化剂的生长机理。
Ni3S4, CoNi2S4, and NiCo2S4 thiospinels were synthesized by a pH-controlled homogeneous precipitation method at 70 °C with metal-chlorides and thioacetamide in the ammonium chloride–ammonia buffer solutions adjusted to pH = 9.9.
Shell-strengthened hollow architecture of NiCo2S4 carved through an in-situ reaction Ostwald Ripening mechanism with significantly enhanced electrochemical performance
作者:Xiaoxiao Wang、Jing Li、Yuanyuan Liu、Meiri Wang、Yuchao Zhao、Hongtao Cui
DOI:10.1016/j.jallcom.2021.161632
日期:2021.12
presents a shell-strengthened hollow structure, satisfying the as-mentioned two requirements: (1) the rich pores in shell and hollow structure plus structural cobalt ions lead to the excellent high-rate performance of NiCo2S4; (2) the dense particulate layer in shell with additional mechanical strength prolongs the cycling life of NiCo2S4. Consequently, the asymmetrical supercapacitors assembled with
对于法拉第超级电容器,镍基材料等一些电池类电极材料因其较高的理论容量而备受关注。然而,由于其个体化要求与材料微观结构的矛盾,这些材料很难同时达到满意的高倍率性能和循环寿命。在这项工作中,我们遵循原位反应 Ostwald 成熟机制,在水热条件下构建了 NiCo 2 S 4的中空结构。制备的 NiCo 2 S 4呈现壳强化的空心结构,满足上述两个要求:(1)壳和空心结构中丰富的孔隙加上结构性钴离子导致NiCo 2 S 4优异的高倍率性能;(2)壳中致密的颗粒层具有额外的机械强度,延长了NiCo 2 S 4的循环寿命。因此,以NiCo 2 S 4为正极材料组装的非对称超级电容器显示出高能量和功率密度以及优异的循环稳定性。
Controllable synthesis of hollow spherical nickel chalcogenide (NiS<sub>2</sub> and NiSe<sub>2</sub>) decorated with graphene for efficient supercapacitor electrodes
作者:Min Lu、Ming-yuan Sun、Xiao-hui Guan、Xue-mei Chen、Guang-Sheng Wang
DOI:10.1039/d0ra10659c
日期:——
The carbon-loaded material by introducing graphite oxide with different mass fractions through a l-cysteine-assisted facile hydrothermal method was synthesized. The specific capacitance was increased with GO and the rate performance was improved.
X-ray photoelectron spectra of 3d transition metal pyrites
作者:H. van der Heide、R. Hemmel、C.F. van Bruggen、C. Haas
DOI:10.1016/0022-4596(80)90543-5
日期:1980.6
orbitals is attributed to vibronic effects. The metal 2p32 spectra show the effects of multiplet splitting and satellites due to shake-up or shake-off processes. The valence band spectra consist of slightly overlapping contributions of anion p and metal 3d electrons. The metal 3d spectrum of FeS2 has a single strong peak of width 0.9 eV. The 3d spectra of the other compounds show structure due to several
In this report, many nanocrystallinetransitionmetalsulfides were synthesized through a simple novel reaction between metal salts and sulfur powders under solvothermal conditions at low temperature. The products were characterized by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). Some factors important for the formation of the product and their morphologies are discussed