Experiments aimed at understanding the effects of material properties on plasma edge parameters in limiter biasing scenarios have been addressed in TJ-II under full lithium wall coverage. Two different materials, graphite and liquid lithium were used as limiting surfaces. Positive and negative biasing respect to the plasma, as well as inter-limiter biasing experiments were carried out. A very different response of the plasma to the applied voltage was found depending on limiter material. While a week effect was seen in C limiter biasing for both polarities, enhancement of particle and energy confinement was observed when the liquid lithium limiter (LLL) was biased positively respect to the plasmas. Furthermore, spontaneous currents at the SOL were produced when both limiters were simultaneously inserted due to very different floating voltages achieved by both material. The implications of secondary electron emission properties of the plasma-exposed surfaces are addressed. Ó 2014 Elsevier B.V. All rights reserved.