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Two different types of centrally extended quantum reflection algebras areintroduced. Realizations in terms of the elements of the central extension ofthe Yang-Baxter algebra are exhibited. A coaction map is identified. For thespecial case of $U_q(\hat{sl_2})$, a realization in terms of elementssatisfying the Zamolodchikov-Faddeev algebra - a `boundary' analog of Miki'sformula - is also proposed, providing a free field realization of$O_q(\hat{sl_2})$ (q-Onsager) currents.

Central extension of the reflection equations and an analog of Miki's formula