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In Situ Formation of Cobalt Nitrides/Graphitic Carbon Composites as Efficient Bifunctional Electrocatalysts for Overall Water Splitting
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-02-19 00:00:00 , DOI: 10.1021/acsami.7b18858
Ziliang Chen , Yuan Ha , Yang Liu , Hao Wang , Hongyuan Yang , Hongbin Xu , Yanjun Li 1 , Renbing Wu
Affiliation  

Developing cost-effective and highly efficient bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of great interest for overall water splitting but still remains a challenging issue. Herein, a self-template route is employed to fabricate a unique hybrid composite constructed by encapsulating cobalt nitride (Co5.47N) nanoparticles within three-dimensional (3D) N-doped porous carbon (Co5.47N [email protected]) polyhedra, which can be served as a highly active bifunctional electrocatalyst. To afford a current density of 10 mA cm–2, the as-fabricated Co5.47N [email protected] only requires overpotentials as low as 149 and 248 mV for HER and OER, respectively. Moreover, an electrolyzer with Co5.47N [email protected] electrodes as both the cathode and anode catalyst in alkaline solutions can drive a current density of 10 mA cm–2 at a cell voltage of only 1.62 V, superior to that of the Pt/IrO2 couple. The excellent electrocatalytic activity of Co5.47N [email protected] can be mainly ascribed to the high inherent conductivity and rich nitrogen vacancies of the Co5.47N lattice, the electronic modulation of the N-doped carbon toward Co5.47N, and the hierarchically porous structure design.

中文翻译:

氮化钴/石墨碳复合材料的原位形成作为整体水分解的高效双功能电催化剂

对于氢气分解反应(HER)和氧气分解反应(OER)而言,开发具有成本效益和高效的双功能电催化剂对于整体水分解非常感兴趣,但仍然是一个具有挑战性的问题。在本文中,采用自模板路线来制造独特的混合复合材料,该复合材料通过将氮化钴(Co 5.47 N)纳米粒子封装在三维(3D)N掺杂的多孔碳(Co 5.47 N [受电子邮件保护])多面体中而制得,可以用作高活性双功能电催化剂。为了提供10 mA cm –2的电流密度,应按原样生产Co 5.47N [受电子邮件保护]仅要求HER和OER的低电势分别低至149和248 mV。此外,在碱性溶液中,具有5.47 N Co (受电子邮件保护)电极作为阴极和阳极催化剂的电解槽可以在仅1.62 V的电池电压下驱动10 mA cm –2的电流密度,优于Pt / IrO 2对。Co 5.47 N优异的电催化活性(受电子邮件保护)主要归因于Co 5.47 N晶格的高固有电导率和丰富的氮空位,N掺杂碳对Co 5.47 N的电子调制以及分层多孔性结构设计。
更新日期:2018-02-19
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