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Oxygen Electrocatalysis with Mesoporous Co−N−C Catalysts: Towards Understanding the Active Site and Development of Rechargeable Zn‐Air Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-22 , DOI: 10.1002/celc.202000595 Arpan Samanta 1 , C. Retna Raj 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-22 , DOI: 10.1002/celc.202000595 Arpan Samanta 1 , C. Retna Raj 1
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We demonstrate the synthesis of two bifunctional electrocatalysts (Co−N−C‐TET and Co−N−C‐Phen) based on cobalt‐ and nitrogen‐doped mesoporous carbon derived from cobalt complexes and their bifunctional electrocatalytic activity towards oxygen electrocatalysis. Both catalysts are bifunctionally active towards the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in alkaline pH. Co−N−C‐TET has excellent OER activity and delivers the benchmark current density of 10 mA cm−2 at a remarkably low overpotential of 0.28 V. The Co−N−C‐Phen catalyst is superior in terms of overall bifunctional activity and durability. The nitrogen and cobalt content of the catalyst controls the overall oxygen electrocatalytic performance. The nitrogen content, and its chemical nature in the catalyst, decides the ORR activity, whereas the metal content of the catalyst regulates the OER activity. Cobalt‐rich Co−N−C‐TET has significantly high OER activity compared to Co−N−C‐Phen. The enhanced OER activity of the Co−N−C‐TET catalyst is ascribed to the presence of a high cobalt content. The graphitic‐N‐ and pyridinic‐N‐rich Co−N−C‐Phen catalyst has enhanced ORR activity. An aqueous rechargeable Zn‐air battery (ZAB) is fabricated using the Co−N−C‐Phen‐based air‐cathode. The ZAB shows an open‐circuit voltage of 1.40 V and power density of 128.2 mW cm−2 with >48 h of galvanostatic charge‐discharge cycling stability. It outperforms the reference ZAB made of Pt and IrO2 catalysts.
中文翻译：
介孔Co-N-C催化剂的氧气电催化：旨在了解活性部位和可充电锌空气电池的发展
我们证明了基于钴配合物和氮掺杂的介孔碳衍生的两种双功能电催化剂（Co-N-C-TET和Co-N-C-Phen）的合成及其对氧电催化的双功能电催化活性。两种催化剂在碱性pH下对氧还原反应（ORR）和氧释放反应（OER）具有双功能活性。Co-NC-TET具有出色的OER活性，可提供10 mA cm -2的基准电流密度在极低的0.28 V过电势下。Co-NC-Phen催化剂在整体双功能活性和耐用性方面表现优异。催化剂的氮和钴含量控制着整体的氧电催化性能。催化剂中的氮含量及其化学性质决定了ORR活性，而催化剂中的金属含量则调节了OER活性。与Co-NC-Phen相比，富钴Co-NC-TET具有显着高的OER活性。Co-NC-TET催化剂的OER活性增强归因于高钴含量的存在。富含石墨N和吡啶N的Co-NC-Phen催化剂具有增强的ORR活性。水性可充电锌空气电池（ZAB）是使用基于Co-NC-Phen的空气阴极制造的。ZAB的开路电压为1.40 V，功率密度为128。−2具有大于48小时的恒电流充放电循环稳定性。它优于由Pt和IrO 2催化剂制成的参比ZAB 。
更新日期：2020-07-10
中文翻译：
介孔Co-N-C催化剂的氧气电催化：旨在了解活性部位和可充电锌空气电池的发展
我们证明了基于钴配合物和氮掺杂的介孔碳衍生的两种双功能电催化剂（Co-N-C-TET和Co-N-C-Phen）的合成及其对氧电催化的双功能电催化活性。两种催化剂在碱性pH下对氧还原反应（ORR）和氧释放反应（OER）具有双功能活性。Co-NC-TET具有出色的OER活性，可提供10 mA cm -2的基准电流密度在极低的0.28 V过电势下。Co-NC-Phen催化剂在整体双功能活性和耐用性方面表现优异。催化剂的氮和钴含量控制着整体的氧电催化性能。催化剂中的氮含量及其化学性质决定了ORR活性，而催化剂中的金属含量则调节了OER活性。与Co-NC-Phen相比，富钴Co-NC-TET具有显着高的OER活性。Co-NC-TET催化剂的OER活性增强归因于高钴含量的存在。富含石墨N和吡啶N的Co-NC-Phen催化剂具有增强的ORR活性。水性可充电锌空气电池（ZAB）是使用基于Co-NC-Phen的空气阴极制造的。ZAB的开路电压为1.40 V，功率密度为128。−2具有大于48小时的恒电流充放电循环稳定性。它优于由Pt和IrO 2催化剂制成的参比ZAB 。
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