铌掺杂二氧化钛的电学性质。1. 缺陷无序。

Electrical properties of niobium-doped titanium dioxide. 1. Defect disorder.

作者信息

Sheppard L R, Bak T, Nowotny J

机构信息

Centre for Materials Research in Energy Conversion, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.

出版信息

J Phys Chem B. 2006 Nov 16;110(45):22447-54. doi: 10.1021/jp0637025.

DOI:10.1021/jp0637025

PMID:17091986

Abstract

The present work reports the electrical conductivity and thermoelectric power for Nb-doped TiO(2) at elevated temperatures (1073-1298 K) in the gas phase of controlled oxygen activity, 10(-14) Pa < p(O(2)) < 75 kPa. It is shown that in reduced conditions the Nb-doped TiO(2) exhibits metallic-type conductivity. This finding paves the way for the development of high-performance photoelectrodes with substantially reduced internal energy losses during charge transport. The present work also determined the equilibrium constant for the formation of oxygen vacancies and titanium vacancies for Nb-doped TiO(2).

摘要

本研究报道了在受控氧活度气相（10⁻¹⁴ Pa < p(O₂) < 75 kPa）中，高温（1073 - 1298 K）下Nb掺杂TiO₂的电导率和热电功率。结果表明，在还原条件下，Nb掺杂TiO₂表现出金属型导电性。这一发现为开发在电荷传输过程中内能损失大幅降低的高性能光电极铺平了道路。本研究还确定了Nb掺杂TiO₂中氧空位和钛空位形成的平衡常数。