Chandrabhan Shende Rashmi, Muruganathan Manoharan, Mizuta Hiroshi, Akabori Masashi, Sundara Ramaprabhu
Department of Physics, Alternative Energy and Nanotechnology Laboratory (AENL), Nano-Functional Materials Technology Centre (NFMTC), Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India.
School of Material Science, Japan Advanced Institute of Science and Technology, Asahidai 1-1, Nomishi, Ishikawa 923-1292, Japan.
ACS Omega. 2018 Dec 13;3(12):17276-17286. doi: 10.1021/acsomega.8b02835. eCollection 2018 Dec 31.
Present work demonstrates a single step process for simultaneous synthesis of metal-nanoparticle-encapsulated nitrogen-doped bamboo-shaped carbon nanotubes (M/N-BCNTs) and graphitic carbon nitride (G-CN). The synthesis of two different carbon nanostructures in a single step is recognized for the first time. This process involves the use of inexpensive and nontoxic precursors such as melamine as carbon and nitrogen sources for the growth of G-CN and M/N-BCNTs. In this technique, the utilization of unwanted gases such as ammonia and hydrocarbons released during the decomposition of melamine is the key to grow M/N-BCNTs over the catalyst along with the formation of G-CN. The implementation of M/N-BCNTs as the electrode material for all-solid-state symmetric supercapacitor results in a maximum specific capacitance of ∼368 F g with excellent electrochemical stability with 97% capacity retention after 10 000 cycles. Furthermore, fabricated symmetric supercapacitor shows maximum high energy and power density up to 10.88 W h kg and 2.06 kW kg, respectively. The superior electrochemical activity of M/N-BCNTs can be attributed to its high surface to area volume ratio, unique structural characteristics, ultrahigh electrical conductivity, and carrier mobility.
目前的工作展示了一种一步法同时合成金属纳米颗粒封装的氮掺杂竹状碳纳米管（M/N-BCNTs）和石墨相氮化碳（G-CN）的过程。首次实现了在一步法中合成两种不同的碳纳米结构。该过程使用廉价且无毒的前驱体，如三聚氰胺作为碳源和氮源来生长G-CN和M/N-BCNTs。在这项技术中，利用三聚氰胺分解过程中释放的诸如氨和碳氢化合物等无用气体，是在催化剂上生长M/N-BCNTs以及形成G-CN的关键。将M/N-BCNTs用作全固态对称超级电容器的电极材料，可实现约368 F g的最大比电容，具有出色的电化学稳定性——在10000次循环后容量保持率为97%。此外，制备的对称超级电容器分别显示出高达10.88 W h kg和2.06 kW kg的最大高能量密度和功率密度。M/N-BCNTs卓越的电化学活性可归因于其高的表面积体积比、独特的结构特征、超高的电导率和载流子迁移率。
