Home Academic journal Grain boundary engineering: a promising s

Grain boundary engineering: a promising s

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The self-supporting binder-free electrode material has better energy storage capacity and better stability than conventional powder electrodes due to its lower electrical resistance.

Among various metallic compositions with pseudocapacitive properties, Ni and Co compounds, including their (hydro)oxides, sulfides and phosphides, are highly theoretical due to their transition from Ni and Co atoms of different valence states, a particular attention was paid to capacity.

Professor Hui Wang and his colleagues from the School of Chemical Engineering of Qingdao University of Science and Technology obtained high specific capacity NiCoP electrode materials by doping the phosphorus element in electrode materials based on of nickel-cobalt. This research has been published online in Frontiers of chemical science and engineering on February 25, 2022.

NiCoP rich in grain boundaries4O12The /NiCoP electrode material was prepared by a three-step method. First, nickel cobalt precursor was prepared by simple hydrothermal treatment, followed by one-step heat treatment, which was converted into nickel cobalt oxide, and finally phosphide composite material was obtained by the vapor deposition method. By changing the phosphating time, different grain boundaries could be obtained.

In the three-step synthesis study, researchers investigated the structure, morphology, and electrochemical properties of the samples through a series of physical characterizations and related electrochemical performance tests, and successfully confirmed the preparation of stacked nanostructures. by crystal grains. The structure of the line array was studied and the key to the improved performance was that the rich density of the grain boundaries greatly increased the active sites of the electrode material, resulting in a huge improvement in the electrochemical performance of the material.

The final research results show that the phosphorus-doped nickel-cobalt electrode material has a high specific capacity of 507.8 μAh cm−2 at 1 mA cm−2 due to phosphorus doping and rich grain boundary density, and achieves 88.5% ultra-stable capacity after 10000 cycles.

This design of abundant grain boundaries within the cell is an attractive strategy to achieve higher active site densities. Moreover, the electronic structure of the grain boundaries is also tuned with respect to the in-plane active sites, which promotes the activity of the network electrodes. The development of gratings rich in grain boundaries is another innovative direction for the improvement of electrochemical capacitors.

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Reference: Mengqi Cui et al (2022). Grain boundary engineering: a promising strategy to configure NiCoP4O12/NiCoP nanowire arrays for ultra-stable supercapacitor, Frontiers of chemical science and engineering DOI: 10.1007/s11705-021-2132-0

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Founded in May 1954, Higher Education Press Limited Company (HEP), affiliated with the Ministry of Education, is one of the earliest institutions engaged in educational publishing after the establishment of PR China in 1949. After six decades of efforts, HEP has grown into a large, comprehensive publisher, with products in various forms and at different levels. Both for import and export, HEP strives to fill the gap in domestic and overseas markets and meet the demand of global customers by cooperating with more than 200 partners around the world and selling products and services in 32 languages ​​worldwide. Today, HEP ranks among the top Chinese publishers in terms of copyright export volume and among the top 50 publishing companies in the world in terms of overall strength.

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On Frontiers of chemical science and engineering

Frontiers of chemical science and engineering presents the latest developments in chemical science and engineering, with an emphasis on emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchanges between scientists around the world. Content includes original reviews, research papers and short communications. Coverage includes reaction catalysis and engineering, clean energy, functional materials, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing. The editors are Academician Jingkang Wang of Tianjin University, Academician Qunji Xue of Ningbo Institute of Industrial Technology and Academician Jiongtian Liu of Zhengzhou University. The journal has been indexed by SCI, Ei, CA, ChemWeb, INSPEC, SCOPUS, Source Journals for Chinese Scientific and Technical Papers and Citations, CSCD, etc.


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