Bifunctional catalysts of Co3O4@GCN tubular nanostructured (TNS) hybrids for oxygen and hydrogen evolution reactions
Bifunctional catalysts of Co3O4@GCN tubular nanostructured (TNS) hybrids for oxygen and hydrogen evolution reactions
复制标题
用于析氧和析氢反应的 Co3O4@GCN 管状纳米结构 (TNS) 杂化物的双功能催化剂
DOI：
10.1007/s12274-015-0872-1
复制
发表时间：
2015-11-01
期刊：
影响因子：
9.9
通讯作者：
Hou, Yanglong
中科院分区：
文献类型：
--
作者：
Tahir, Muhammad;Mahmood, Nasir;Hou, Yanglong
析氧和析氢反应 (OER/HER) 催化剂是水分解等可再生绿色能源的核心。尽管人们在开发 OER 和 HER 的高效催化剂方面付出了巨大的努力，但双功能催化剂的开发仍然面临着巨大的挑战。在这里，我们报告了一种嵌入石墨碳氮化物（GCN）管状纳米结构中的 Co3O4 的新型杂化物，并通过简便、大规模的低温化学方法合成。 Co3O4 和 GCN 之间的强大协同效应使其作为 OER 和 HER 双功能催化剂具有优异的性能。高表面积、独特的管状纳米结构和混合物的组成使所有氧化还原位点易于催化，并提供更快的离子和电子传导。 Co3O4@GCN管状纳米结构（TNS）混合物在OER中表现出最低的过电势（0.12 V）和优异的电流密度（147 mA/cm(2)），优于基准IrO2和RuO2，并且在碱性介质中具有优异的耐久性。此外，Co3O4@GCN TNS 混合物在 HER 中表现出优异的性能，具有低得多的起始电压和过电位以及稳定的电流密度。预计本研究中开发的 Co3O4@GCN TNS 混合材料将成为大规模水分解和燃料电池中贵金属催化剂的有吸引力的替代品。
Catalysts for oxygen and hydrogen evolution reactions (OER/HER) are at the heart of renewable green energy sources such as water splitting. Although incredible efforts have been made to develop efficient catalysts for OER and HER, great challenges still remain in the development of bifunctional catalysts. Here, we report a novel hybrid of Co3O4 embedded in tubular nanostructures of graphitic carbon nitride (GCN) and synthesized through a facile, large-scale chemical method at low temperature. Strong synergistic effects between Co3O4 and GCN resulted in excellent performance as a bifunctional catalyst for OER and HER. The high surface area, unique tubular nanostructure, and composition of the hybrid made all redox sites easily available for catalysis and provided faster ionic and electronic conduction. The Co3O4@GCN tubular nanostructured (TNS) hybrid exhibited the lowest overpotential (0.12 V) and excellent current density (147 mA/cm(2)) in OER, better than benchmarks IrO2 and RuO2, and with superior durability in alkaline media. Furthermore, the Co3O4@GCN TNS hybrid demonstrated excellent performance in HER, with a much lower onset and overpotential, and a stable current density. It is expected that the Co3O4@GCN TNS hybrid developed in this study will be an attractive alternative to noble metals catalysts in large scale water splitting and fuel cells.