Nanoscale nickel–iron nitride-derived efficient electrochemical oxygen evolution catalysts,Catalysis Science & Technology

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Nanoscale nickel–iron nitride-derived efficient electrochemical oxygen evolution catalysts
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-06-10 , DOI: 10.1039/d0cy00689k
Jianmin Wang _{1,

2,

3,

4,

5} , Feng Cao _{1,

2,

3,

4,

5} , Chen Shen _{1,

2,

3,

4,

5} , Guoqing Li _{6,

7,

8,

9} , Xin Li _{1,

2,

3,

4,

5} , Xi Yang _{1,

2,

3,

4,

5} , Song Li _{1,

2,

3,

4,

5} , Gaowu Qin _{1,

2,

3,

4,

5}

Affiliation

The development of efficient electrocatalysts for the oxygen evolution reaction (OER) is critical for the generation of renewable energy carrier hydrogen from water splitting. Recently, metal oxides derived from metal nitrides, sulfides, chalcogenides, and phosphides have been demonstrated to exhibit superior catalytic activity as electrocatalysts for the OER but otherwise are difficult to gain access to by conventional metal oxidation methods. In this work, we demonstrate a novel in situ chemical etching process of Ni(OH)₂ nanosheets followed by a thermal ammonolysis process to fabricate iron–nickel nitride Ni₃FeN supported by pure Ni metal. Ni₃FeN is not stable and would be converted partially into NiFeOOH under oxygen-evolution conditions, forming a NiFeOOH/Ni₃FeN/Ni heterojunction showing extraordinarily high activity for the OER in alkaline medium with a low overpotential of 200 mV at 10 mA cm⁻² and a Tafel slope of 36 mV dec⁻¹. We demonstrated that NiFeOOH is the major active material while Ni₃FeN/Ni could help increase the charge transfer dramatically. More importantly, the presented NiFeOOH/Ni₃FeN/Ni catalyst has extremely good durability. This work provides a new strategy for the synthesis of metal and metal oxide heterojunctions for efficient electrocatalysts for the oxygen evolution reaction.

中文翻译：

纳米镍铁氮化物衍生的高效电化学制氧催化剂

用于氧气析出反应（OER）的高效电催化剂的开发对于由水分解产生可再生能源载体氢至关重要。近来，已证明衍生自金属氮化物，硫化物，硫属元素化物和磷化物的金属氧化物显示出优异的催化活性，作为OER的电催化剂，但否则难以通过常规金属氧化方法获得。在这项工作中，我们展示了一种新颖的Ni（OH）₂纳米片原位化学蚀刻工艺，然后进行热氨解工艺来制造由纯Ni金属支撑的铁-氮化镍Ni ₃ FeN。镍₃FeN不稳定，在氧气逸出条件下会部分转化为NiFeOOH，形成NiFeOOH / Ni ₃ FeN / Ni异质结，在10 mA cm ^-2的低介电常数为200 mV的碱性介质中，对OER具有极高的活性和Tafel斜率为36 mV dec ^-1。我们证明了NiFeOOH是主要的活性材料，而Ni ₃ FeN / Ni可以帮助显着增加电荷转移。更重要的是，提出的NiFeOOH / Ni ₃ FeN / Ni催化剂具有极好的耐久性。这项工作为氧释放反应的有效电催化剂的金属和金属氧化物异质结的合成提供了新的策略。

更新日期：2020-07-06

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