Ni3N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium
Ni3N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium
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DOI：
10.1002/anie.201902751
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发表时间：
2019-05-27
影响因子：
16.6
通讯作者：
Hu, Xile
中科院分区：
文献类型：
--
作者：
Ni, Weiyan;Krammer, Anna;Hu, Xile
氢氧化物交换膜燃料电池可以潜在地利用不含铂族金属（PGM）的电催化剂，相对于更先进的质子交换膜燃料电池提供成本和可扩展性优势。然而，缺乏对与氢氧化物交换膜燃料电池相关的氢氧化反应（HOR）有活性且稳定的非贵重电催化剂。在这里，我们报告的发现和发展的Ni 3 N作为一个积极的和强大的HOR催化剂在碱性介质中。负载型催化剂，Ni 3 N/C，表现出迄今为止最高的质量活性和分解潜力的铂族金属-无催化剂。该催化剂在碱性介质中也表现出类似Pt的析氢活性。光谱数据揭示了从Ni到Ni 3 N和从Ni 3 N到碳载体的界面电荷转移的Ni d带的下移。这些性质削弱了氢和氧物种的结合能，导致显着的HOR活性和稳定性。
Hydroxide-exchange membrane fuel cells can potentially utilize platinum-group-metal (PGM)-free electrocatalysts, offering cost and scalability advantages over more developed proton-exchange membrane fuel cells. However, there is a lack of non-precious electrocatalysts that are active and stable for the hydrogen oxidation reaction (HOR) relevant to hydroxide-exchange membrane fuel cells. Here we report the discovery and development of Ni3N as an active and robust HOR catalyst in alkaline medium. A supported version of the catalyst, Ni3N/C, exhibits by far the highest mass activity and break-down potential for a PGM-free catalyst. The catalyst also exhibits Pt-like activity for hydrogen evolution reaction (HER) in alkaline medium. Spectroscopy data reveal a downshift of the Ni d band going from Ni to Ni3N and interfacial charge transfer from Ni3N to the carbon support. These properties weaken the binding energy of hydrogen and oxygen species, resulting in remarkable HOR activity and stability.