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Engineering Porous Quasi‐Spherical Fe−N−C Nanocatalysts with Robust Oxygen Reduction Performance for Zn‐Air Battery Application
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-08-12 , DOI: 10.1002/cnma.202000404 Yanping Huang 1 , Penggao Liu 1 , Rui Hao 1 , Shuting Kan 1 , Yufeng Wu 1 , Hongtao Liu 2 , Kaiyu Liu 1
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-08-12 , DOI: 10.1002/cnma.202000404 Yanping Huang 1 , Penggao Liu 1 , Rui Hao 1 , Shuting Kan 1 , Yufeng Wu 1 , Hongtao Liu 2 , Kaiyu Liu 1
Affiliation
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The accessibility to highly active oxygen reduction reaction (ORR) catalysts with low cost is a priority for the rapid industrialization of Zn‐Air batteries. Herein, we propose a facile engineering synthesis of high‐activity quasi‐spherical Fe−N−C ORR nanocatalysts by chemical self‐assmbly. The morphological and structural features of the materials have been fully characterized. The synchrotron radiation techniques reveal that the targeted Fe−N−PQS‐900 with highly exposed Fe−Nx active sites well dispersed on the N‐rich micro‐nano carbon framework, endowing them with efficient access to oxygeneous species. The electrochemical measurements show its superior ORR catalytic performance to the commercial Pt/C catalyst, including a more positive half‐wave potential, smaller Tafel slope, better methanol‐tolerance capability, and more sustainable cycloability as well. An assembled Zn‐Air battery using the Fe−N−PQS‐900 as the cathode catalyst shows a specific capacity of 798 mAh g−1 with a power density of 114 mW cm−2 and an energy density of 958 Wh kg−1, enabling this non‐precious metal electrocatalyst very competitive in metal air fuel cell applications.
中文翻译：
工程多孔准球形Fe-N-C纳米催化剂，具有强大的氧还原性能，可用于锌空气电池
低成本获得高活性氧还原反应（ORR）催化剂是Zn-Air电池快速工业化的首要任务。在本文中，我们提出了一种通过化学自吸附技术轻松合成高活性准球形Fe-N-C ORR纳米催化剂的工程方法。材料的形态和结构特征已得到充分表征。同步辐射技术揭示了目标Fe-N-PQS-900具有高度暴露的Fe-N x活性位点很好地分散在富氮的微纳米碳骨架上，使它们有效地接触了含氧物质。电化学测量表明，它的ORR催化性能优于商用Pt / C催化剂，包括更正的半波电势，更小的Tafel斜率，更好的耐甲醇性以及更可持续的循环性。使用Fe-N-PQS-900作为阴极催化剂的组装Zn-Air电池显示的比容量为798 mAh g -1，功率密度为114 mW cm -2，能量密度为958 Wh kg -1，使这种非贵金属电催化剂在金属空气燃料电池应用中极具竞争力。
更新日期：2020-08-12
中文翻译：
工程多孔准球形Fe-N-C纳米催化剂，具有强大的氧还原性能，可用于锌空气电池
低成本获得高活性氧还原反应（ORR）催化剂是Zn-Air电池快速工业化的首要任务。在本文中，我们提出了一种通过化学自吸附技术轻松合成高活性准球形Fe-N-C ORR纳米催化剂的工程方法。材料的形态和结构特征已得到充分表征。同步辐射技术揭示了目标Fe-N-PQS-900具有高度暴露的Fe-N x活性位点很好地分散在富氮的微纳米碳骨架上，使它们有效地接触了含氧物质。电化学测量表明，它的ORR催化性能优于商用Pt / C催化剂，包括更正的半波电势，更小的Tafel斜率，更好的耐甲醇性以及更可持续的循环性。使用Fe-N-PQS-900作为阴极催化剂的组装Zn-Air电池显示的比容量为798 mAh g -1，功率密度为114 mW cm -2，能量密度为958 Wh kg -1，使这种非贵金属电催化剂在金属空气燃料电池应用中极具竞争力。
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