Development of Cobalt Hydroxide as a Bifunctional Catalyst for Oxygen Electrocatalysis in Alkaline Solution
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- 作者：Yi Zhan ; Guojun Du ; Shiliu Yang ; Chaohe Xu ; Meihua Lu ; Zhaolin Liu ; Jim Yang Lee
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：June 17, 2015
- 年：2015
- 卷：7
- 期：23
- 页码：12930-12936
- 全文大小：395K
- ISSN：1944-8252
文摘
Co(OH)2 in the form of hexagonal nanoplates synthesized by a simple hydrothermal reaction has shown even greater activity than cobalt oxides (CoO and Co3O4) in oxygen reduction and oxygen evolution reactions (ORR and OER) under alkaline conditions. The bifunctionality for oxygen electrocatalysis as shown by the OER鈥揙RR potential difference (螖E) could be reduced to as low as 0.87 V, comparable to the state-of-the-art non-noble bifunctional catalysts, when the Co(OH)2 nanoplates were compounded with nitrogen-doped reduced graphene oxide (N-rGO). The good performance was attributed to the nanosizing of Co(OH)2 and the synergistic interaction between Co(OH)2 and N-rGO. A zinc鈥揳ir cell assembled with a Co(OH)2鈥揳ir electrode also showed a performance comparable to that of the state-of-the-art zinc鈥揳ir cells. The combination of bifunctional activity and operational stability establishes Co(OH)2 as an effective low-cost alternative to the platinum group metal catalysts.