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Design of a Three-Dimensional Interconnected Hierarchical Micro–Mesoporous Structure of Graphene as Support Material for Spinel NiCo2O4 Electrocatalysts toward Oxygen Reduction Reaction
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-11-20 , DOI: 10.1021/acs.jpcc.8b08692 Tingwei Zhang 1 , Zhongfang Li 1 , Zhixu Zhang 1 , Likai Wang 1 , Peng Sun 1 , Suwen Wang 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-11-20 , DOI: 10.1021/acs.jpcc.8b08692 Tingwei Zhang 1 , Zhongfang Li 1 , Zhixu Zhang 1 , Likai Wang 1 , Peng Sun 1 , Suwen Wang 1
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The development of cost-effective electrocatalysts with high performance for oxygen reduction reaction is the main problem for fuel cells and metal–air batteries. Herein, a novel interconnected hierarchical three-dimensional graphene (3D-HG) is first fabricated by the templated method, where coal tar pitch and CaCO3 were used as carbon precursor and template, respectively. The pyrolysis of CaCO3 could produce CaO and CO2 at 800 °C, where the obtained CaO can serve as the template and CO2 can promote the formation of micropores to facilitate the interconnect of the mesopores in 3D-HG. Spinel NiCo2O4 is synthesized on 3D-HG by the hydrothermal method, which is denoted as NiCo2O4/3D-HG. The as-prepared NiCo2O4/3D-HG catalysts retain the hierarchical micro–mesoporous structure of graphene. Benefiting from the mass transport convenience of the hierarchical structure, NiCo2O4/3D-HG exhibits high-performance half-wave potential (0.82 V vs reversible hydrogen electrode (RHE)) better than NiCo2O4/reduced graphene oxide (0.79 V), NiCo2O4/carbon nanotubes (0.73 V), and 20 wt % Pt/C (0.81 V), and shows higher durability than 20 wt % Pt/C. This work proves that NiCo2O4/3D-HG is a cost-effective electrocatalyst for fuel cells or metal–air batteries.
中文翻译：
尖晶石NiCo 2 O 4电催化剂上氧还原反应的石墨烯三维互连微孔结构的设计
燃料电池和金属空气电池的主要问题是开发具有成本效益的高性能氧还原反应电催化剂。在此，首先通过模板化方法制备了新颖的互连分层三维石墨烯（3D-HG），其中分别以煤焦油沥青和CaCO 3为碳前体和模板。CaCO 3的热解可以在800°C时产生CaO和CO 2，其中获得的CaO可以用作模板，CO 2可以促进微孔的形成，从而促进3D-HG中中孔的相互连接。通过水热法在3D-HG上合成尖晶石NiCo 2 O 4，称为NiCo2 O 4 / 3D-HG。所制备的NiCo 2 O 4 / 3D-HG催化剂保留了石墨烯的分级微介孔结构。得益于分层结构的传质便利性，NiCo 2 O 4 / 3D-HG的高性能半波电势（0.82 V vs可逆氢电极（RHE））要优于NiCo 2 O 4 /还原石墨烯氧化物（0.79） V），NiCo 2 O 4 /碳纳米管（0.73 V）和20 wt％Pt / C（0.81 V），并且显示出比20 wt％Pt / C更高的耐久性。这项工作证明了NiCo 2 O 4/ 3D-HG是用于燃料电池或金属空气电池的经济高效的电催化剂。
更新日期：2018-11-21
中文翻译：
尖晶石NiCo 2 O 4电催化剂上氧还原反应的石墨烯三维互连微孔结构的设计
燃料电池和金属空气电池的主要问题是开发具有成本效益的高性能氧还原反应电催化剂。在此，首先通过模板化方法制备了新颖的互连分层三维石墨烯（3D-HG），其中分别以煤焦油沥青和CaCO 3为碳前体和模板。CaCO 3的热解可以在800°C时产生CaO和CO 2，其中获得的CaO可以用作模板，CO 2可以促进微孔的形成，从而促进3D-HG中中孔的相互连接。通过水热法在3D-HG上合成尖晶石NiCo 2 O 4，称为NiCo2 O 4 / 3D-HG。所制备的NiCo 2 O 4 / 3D-HG催化剂保留了石墨烯的分级微介孔结构。得益于分层结构的传质便利性，NiCo 2 O 4 / 3D-HG的高性能半波电势（0.82 V vs可逆氢电极（RHE））要优于NiCo 2 O 4 /还原石墨烯氧化物（0.79） V），NiCo 2 O 4 /碳纳米管（0.73 V）和20 wt％Pt / C（0.81 V），并且显示出比20 wt％Pt / C更高的耐久性。这项工作证明了NiCo 2 O 4/ 3D-HG是用于燃料电池或金属空气电池的经济高效的电催化剂。
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