Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 37, Pages 24638-24644Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b08112
Keywords
TiO2; nanotube arrays; betavoltaic; graphene; electrochemical reduction
Funding
- National Natural Science Foundation of China [61574117, 61274120]
- Research Council of Norway [221860/F40, 237761, 231416/F20]
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We report a novel betavoltaic device with significant conversion efficiency by using electrochemically reduced graphene oxide (ERGO) on TiO2 nanotube arrays (TNTAs) for enhancing the absorption of beta radiation as well as the transportation of carriers. ERGO on TNTAs (G-TNTAs) were prepared by electrochemical anodization and subsequently cyclic voltammetry techniques. A 10 mCi of Ni-63/Ni source was assembled to G-TNTAs to form the sandwich-type betavoltaic devices (Ni/Ni-63/G-TNTAs/Ti). By I-V measurements, the optimum betavoltaic device exhibits a significant effective energy conversion efficiency of 26.55% with an open-circuit voltage of 2.38 V and a short-circuit current of 14.69 nAcm(-2). The experimental results indicate that G-TNTAs are a high-potential nanocomposite for developing betavoltaic batteries.
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