关键词: 二氧化钛纳米管阵列薄膜/
电化学阳极氧化/
同位素电池/
伏特效应
English Abstract
Investigation on voltaic effect based on one-dimensional TiO2 nanotube array thin film
Wang Na1,2,Ma Yang1,2,
Chen Chang-Song1,2,
Chen Jiang1,2,
San Hai-Sheng1,2,3,
Chen Ji-Ge3,
Cheng Zheng-Dong3,4
1.Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361005, China;
2.Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China;
3.Shenzhen β Energy Technologies Co., Ltd., Shenzhen 518063, China;
4.Texas A & M University, Texas 77843, USA
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 61574117) and the Shenzhen Science and Technology Planning Project, China (Grant No. JCYJ20170306141006600).Received Date:26 August 2017
Accepted Date:13 December 2017
Published Online:20 February 2019
Abstract:This work is to develop a high-reliability long-life high-conversion-efficiency radio-isotope microbattery in order to meet power requirements of micro-electromechanical systems, micro-sensors, micro-actuators, wireless sensing net, and other electron devices working in harsh circumstances, such as polar, desert, subsea, outer surface, etc. Compared with traditional dry batteries, chemical batteries, fuel cells and solar cells, the radioactive isotope batteries have long service life, higher energy density, strong adaptability to environment, good work stability, no maintenance, and miniaturized size, etc. These advantages make the voltaic battery an attractive alternative. In this paper we present a voltaic battery with enhanced voltaic effect by using a wide-bandgap semiconductor TiO2 nanotube array thin film. An electrochemical anodic oxidation method is used to prepare the vertically oriented and highly ordered TiO2 nanotube array film on Ti plate. Electrolyte solution consists of ammonium fluoride, ethylene glycol, and deionized water. The structure (TiO2 nanotube array with diameter about 80-100 nm, wall thickness about 15-25 nm, and length 9 m) is characterized by field emission scanning electron microscope. The microstructure of the TiO2 nanotube array is characterized using X-ray diffraction. The effects of annealing condition on optical and electrical properties are studied. The electrical property is characterized by Keithley model 2450 source meter semiconductor characterization system in dark at room temperature. The voltaic batteries are assembled as a sandwiched structure (63Ni/TiO2 nanotube arrays film/Ti) using a radioisotope 63Ni plate and TiO2 nanotube array films. The experimental results show that the black TiO2 nanotube array film annealed at 450 ℃ in argon atmosphere could creates high visible-ultraviolet absorption due to a great many of oxygen vacancy defects generated in TiO2 nanotube array film. The oxygen vacancy signals are found by electron spin resonance. Compared with the planar structure, the nano-porous array structure has strong absorption to particles:most of the particles enter into the pores and are reflected or absorbed by the surface of the tube walls. With a 10 mCi 63Ni radiation source, the voltaic battery using black TiO2 nanotube array film can generate an open-circuited voltage of 1.02 V, a short-circuited current of 75.52 nA, and a maximum effective conversion efficiency of 22.48%.
Keywords: TiO2 nanotube arrays thin films/
electrochemical anodic oxidation/
voltaic battery/
voltaic effect
