Nano-structured ternary niobium titanium nitrides as durable non-carbon supports for oxygen reduction reaction

Abstract

A novel, highly stable, non-carbon support system for the oxygen reduction reaction (ORR) has been discovered in the form of nano-structured (NbxTi1-x)Ns (x = 0.25 and 0.5). Template-free, solid-solid separation synthetic approaches have been used for preparing these materials. The (NbxTi1-x)N materials have high specific surface area and better electronic conductivity than carbon-based supports.

Porosity‐Controlled TiNb2O7 Microspheres with Partial Nitridation as A Practical Negative Electrode for High‐Power Lithium‐Ion Batteries

“…Figure 5 a shows the fi rstcycle voltage profi les at 0.1 C (1 C = 387 mA g −1 ). [ 17,18 ] Moreover, improvement in the rate capability is also achieved for the NPTNO MS-3 electrode as shown in Figure 5 c. Although PTNO MS-2 shows remarkable rate capability, the capacity retention of NPTNO MS-2 at ultrahigh C rates (e.g., over 20 C) is even better. Consistent with CV results, the NPTNO MS-3 electrode shows lower capacity than PTNO MS-2 due to the presence of inactive nitride.…”

“…[ 16,17 ] As the nitridation time increases to 50 min, PTNO MSs are completely transformed into Ti 1− x Nb x N as shown in Figure 2 a. In order to enhance the conductivity, nitridation treatment is performed on PTNO MS-2 to introduce conducting titanium niobium nitride (Ti 1− x Nb x N), and the nitridated sample is denoted as NPTNO MSs.…”

Engineering of Hierarchical and Three‐Dimensional Architectures Constructed by Titanium Nitride Nanowire Assemblies for Efficient Electrocatalysis

“…The N 2 adsorption/desorption isotherms and the pore size distributions of Barrett‐Joyner‐Halenda (BJH) were shown in Figure S2, which exhibits a clear hysteretic loop (Figure S2a), and the BJH curves verified the co‐existence of meso‐ and macro‐pores in the 3D architectures (Figure S2b), confirming the hierarchical and porous structure of the samples. The specific surface area of 3D TiN, Ti 0.9 Co 0.1 N and Ti 0.9 Cu 0.1 N was 126.1, 130.4 and 119.7 m 2 g −1 , respectively, much larger than those of previously published TiN based materials ,,. It's believed that the high surface area was derived from the discrete 3D architecture, and the hierarchical and porous structure.…”

“…The specific surface area of 3D TiN, Ti 0.9 Co 0.1 N and Ti 0.9 Cu 0.1 N was 126.1, 130.4 and 119.7 m 2 g À 1 , respectively, much larger than those of previously published TiN based materials. [33,42,43] It's believed that the high surface area was derived from the discrete 3D architecture, and the hierarchical and porous structure.…”

“…In addition, TiN was also widely investigated as an ideal alternative catalyst support to perishable carbon support, and the resulting catalysts exhibited improved activity and durability. [32,33] Generally, the preparation of the TMNs requires hightemperature annealing treatment, for many cases, only bulky particles with diameters over than 50 nm were obtained, resulting in a lower surface areas. [34,35] Furthermore, the prepared TMNs particles are easy to agglomerate and suffer from the size and morphology control, leading to an inefficient electron transport.…”