5 results about "Metallic nanotubes" patented technology

The invention discloses an application of a single-metal Co (at) N-C nanotube with high C and N contents. The Co (at) N-C nanotube is used for a zinc or magnesium metal air battery positive electrode material catalyst. The application of the oxygen reduction catalyst in a primary zinc-air battery, a primary magnesium-air battery and a secondary zinc-air battery is realized. The oxygen reduction catalytic material is characterized by being a monometallic catalyst, and shows relatively high energy density and power density in a metal battery. The half-wave potential of the prepared single-metal catalyst Co (at) NC-1Co (at) NC-1 is 0.85 V, and the half-wave potential exceeds the half-wave potential of commercialized 20% Pt / C; the limit diffusion current density Jd is 5.44 mA cm <-2 >, which is equivalent to that of commercial 20% Pt / C. The power density of a primary zinc air battery taking Co-coated NC-1 as the oxygen reduction catalyst is 202 mW cm <-2 >, and the maximum energy density is 928 Wh kg <-1 > Zn, which is higher than that of a Pt / C-based zinc metal air battery. The catalyst has the advantages of easily available raw materials, simple preparation and low cost, and has potential commercial application value.

The application belongs to the technical field of proton exchange membrane fuel cell, and relates to a hydrophobicity-adjustable alloy nanotube array electrode for fuel cell and preparation and application thereof. Specifically, the application comprises preparation of metal nanotube array, alloying and hydrophobization of the metal nanotube array, and assembly of the membrane electrode. First, a metal nanotube array is constructed on a substrate surface through a two-step hydrothermal method; then, a hydrophobic substance is introduced into the metal nanotube array by means of immersion or ultrasonic spraying; then, pyrolysis is performed to realize alloying and hydrophobization of the nanotube array; finally, the nanotube array is transferred to a proton membrane, and the membrane electrode is cleaned. The membrane electrode can be applied to a proton exchange membrane fuel cell. The hydrophobicity-adjustable nanotube array electrode prepared by the application has the advantages of high catalyst activity and stability, low platinum loading, good water management, and easy scaling-up.

The application relates to a preparation method of a hydrogen energy catalyst with a high-efficiency mass transfer three-phase interface, which comprises the following steps: (1) taking a commercial Pt / C, PtM / C (M is an excessive metal) catalyst as the basis, mixing the catalyst with concentrated H2SO4 and concentrated HNO3 solutions through sufficient stirring, achieving carboxyl treatment on the surface of the carbon carrier of the catalyst, and thus forming DNA grafting sites; (2) stirring the customized DNA and the catalyst subjected to the carboxyl treatment in step (1) at a selected temperature, so that the end groups of the DNA are stably combined with the carboxyl groups on the surface of the carbon carrier; (3) mixing the catalyst grafted with the DNA with a metal ion solution of a selected element; and (4) removing the DNA residues through acid treatment, finally forming metal nanotube arrays with a self-supporting function on the surface of the carbon carrier of the catalyst, and completing the preparation of the catalyst. The method can solve the problems of the prior art, such as the limited material transmission at the Pt-ionomer interface, the activity reduction caused by the sulfonic acid group poisoning and the like.

This invention relates to the field of micro / nanomaterial fabrication and micro energy storage device technology. The invention discloses an in-situ fabrication method for on-chip integrated nanotube array supercapacitor electrodes, comprising the following steps: in-situ construction of an on-chip patterned template; in-situ electrochemical growth of a metal nanotube array; in-situ conversion of a metal / metal oxide composite structure; and the forming of an integrated electrode. This invention directly constructs a patterned anodic aluminum oxide template on a chip substrate with a pre-prepared patterned conductive layer (non-aluminum material) and completes material growth. The resulting nanotube array electrode and the current collector on the chip are grown in situ and integrally formed, avoiding complex material transfer and secondary bonding steps. This achieves perfect compatibility with planar microelectronic processes and can be mass-produced on 4-inch and larger wafers.

The application discloses a method for growing BCN nanotubes inside wood-derived carbon pores, and belongs to the technical field of supercapacitor materials. The steps of the application are as follows: wood chips are ultrasonically cleaned and dried; the wood chips are subjected to low-temperature pre-oxidation and high-temperature carbonization, and then are polished; the carbonized wood is immersed in a mixed solution of boric acid, polyethylene glycol and urea, so that the mixed solution is impregnated into the pores of the carbonized wood to obtain sample A; sample A is high-temperature calcined to obtain BCN nanotube / wood-derived carbon material; and the BCN nanotube / wood-derived hierarchical porous carbon is obtained by physically activating the BCN nanotube / wood-derived carbon material. The material prepared by the method of the application does not need to add additional binders, conductive agents and catalysts. The unique structure of the metal-free BCN nanotube and the existence of B and N make the electrode material have good conductivity, high specific capacitance and excellent cycle stability, which is beneficial to the application in supercapacitor electrode materials.