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An Isolated Zinc–Cobalt Atomic Pair for Highly Active and Durable Oxygen Reduction
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-02-06 , DOI: 10.1002/anie.201810175 Ziyang Lu 1 , Bo Wang 1 , Yongfeng Hu 2 , Wei Liu 3 , Yufeng Zhao 1, 4 , Ruoou Yang 5 , Zhiping Li 1 , Jun Luo 3 , Bin Chi 6 , Zheng Jiang 5 , Minsi Li 7 , Shichun Mu 8 , Shijun Liao 6 , Jiujun Zhang 4 , Xueliang Sun 7
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-02-06 , DOI: 10.1002/anie.201810175 Ziyang Lu 1 , Bo Wang 1 , Yongfeng Hu 2 , Wei Liu 3 , Yufeng Zhao 1, 4 , Ruoou Yang 5 , Zhiping Li 1 , Jun Luo 3 , Bin Chi 6 , Zheng Jiang 5 , Minsi Li 7 , Shichun Mu 8 , Shijun Liao 6 , Jiujun Zhang 4 , Xueliang Sun 7
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A competitive complexation strategy has been developed to construct a novel electrocatalyst with Zn‐Co atomic pairs coordinated on N doped carbon support (Zn/CoN‐C). Such architecture offers enhanced binding ability of O2, significantly elongates the O−O length (from 1.23 Å to 1.42 Å), and thus facilitates the cleavage of O−O bond, showing a theoretical overpotential of 0.335 V during ORR process. As a result, the Zn/CoN‐C catalyst exhibits outstanding ORR performance in both alkaline and acid conditions with a half‐wave potential of 0.861 and 0.796 V respectively. The in situ XANES analysis suggests Co as the active center during the ORR. The assembled zinc–air battery with Zn/CoN‐C as cathode catalyst presents a maximum power density of 230 mW cm−2 along with excellent operation durability. The excellent catalytic activity in acid is also verified by H2/O2 fuel cell tests (peak power density of 705 mW cm−2).
中文翻译：
隔离的锌钴原子对，可实现高活性和持久性的氧还原
已开发出一种竞争性络合策略，以构建一种在N掺杂碳载体（Zn / CoN-C）上配位的Zn-Co原子对的新型电催化剂。这种结构提供了增强的O 2结合能力，显着延长了O-O长度（从1.23到1.42Å），从而促进了O-O键的裂解，在ORR过程中显示了0.335 V的理论超电势。结果，Zn / CoN-C催化剂在碱性和酸性条件下均表现出出色的ORR性能，其半波电位分别为0.861和0.796V。原位XANES分析表明，在ORR过程中，Co作为活性中心。以Zn / CoN-C作为阴极催化剂的锌空气电池组的最大功率密度为230 mW cm -2以及出色的操作耐久性。还通过H 2 / O 2燃料电池测试（峰值功率密度为705 mW cm -2）证实了在酸中的优异催化活性。
更新日期：2019-02-06
中文翻译：
隔离的锌钴原子对，可实现高活性和持久性的氧还原
已开发出一种竞争性络合策略，以构建一种在N掺杂碳载体（Zn / CoN-C）上配位的Zn-Co原子对的新型电催化剂。这种结构提供了增强的O 2结合能力，显着延长了O-O长度（从1.23到1.42Å），从而促进了O-O键的裂解，在ORR过程中显示了0.335 V的理论超电势。结果，Zn / CoN-C催化剂在碱性和酸性条件下均表现出出色的ORR性能，其半波电位分别为0.861和0.796V。原位XANES分析表明，在ORR过程中，Co作为活性中心。以Zn / CoN-C作为阴极催化剂的锌空气电池组的最大功率密度为230 mW cm -2以及出色的操作耐久性。还通过H 2 / O 2燃料电池测试（峰值功率密度为705 mW cm -2）证实了在酸中的优异催化活性。
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