Janus CoN/Co cocatalyst in porous N-doped carbon: toward enhanced catalytic activity for hydrogen evolution†,Catalysis Science & Technology

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Janus CoN/Co cocatalyst in porous N-doped carbon: toward enhanced catalytic activity for hydrogen evolution†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-06-22 00:00:00 , DOI: 10.1039/c8cy00571k
Meihong Fan _{1,

2,

3,

4,

5} , Yuenan Zheng _{1,

2,

3,

4,

5} , Ang Li _{1,

2,

3,

4,

5} , Kaiqian Li _{1,

2,

3,

4,

5} , Hanyu Liu _{6,

7,

8,

9} , Zhen-An Qiao _{1,

2,

3,

4,

5}

Affiliation

Using earth abundant transition metal-based compounds to replace noble metal catalysts towards hydrogen evolution from water splitting seems to have great importance worldwide. Compositional modulation and structural design on nanoscale have been hot topics for the optimization of their catalytic properties and have attracted great research interest. In this study, we report Co/CoN Janus nanoparticles embedded in a porous nitrogen doped carbon (Co/CoN–NC) composite catalyst, derived by the heat treatment of a Co²⁺ containing polymer in ammonia atmosphere. The as-obtained hybrid catalyst showed excellent electrocatalytic activities for the hydrogen evolution reaction in both acidic and basic media, and it delivered a current density of 10 mA cm⁻² at the overpotential of 160 mV in 1 M KOH and 190 mV in 0.5 M H₂SO₄ electrolyte. In addition, the catalyst could sustain potentiostatic electrolysis for at least 100 hours at 10 mA cm⁻² in both acidic and alkaline solutions. Mechanistic study suggested that the high activity of the composite electrocatalyst originated from the Janus effects between Co and CoN, which enhanced the electron transfer efficiency and led to fast hydrogen adsorption and desorption kinetics.

中文翻译：

多孔氮掺杂碳中的Janus CoN / Co助催化剂：朝着增强氢析出的催化活性的方向转变†

在全球范围内，使用富含土类的过渡金属基化合物代替贵金属催化剂以实现从水分解中析出氢气的重要性。纳米级的成分调节和结构设计一直是优化其催化性能的热门话题，并引起了极大的研究兴趣。在这项研究中，我们报道了在多孔氮掺杂碳（Co / CoN–NC）复合催化剂中嵌入的Co / CoN Janus纳米颗粒，该催化剂是通过在氨气氛中对含Co ²⁺的聚合物进行热处理而得到的。如此获得的杂化催化剂在酸性和碱性介质中均表现出优异的对氢释放反应的电催化活性，并提供了10 mA cm ^-2的电流密度在1 M KOH中的电势为160 mV，在0.5 MH ₂ SO ₄的电势中为190 mV 。另外，催化剂可以在酸性和碱性溶液中在10mA cm ^-2下维持恒电位电解至少100小时。机理研究表明，复合电催化剂的高活性源自Co和CoN之间的Janus效应，从而提高了电子转移效率并导致快速的氢吸附和解吸动力学。

更新日期：2018-06-22

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