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Hetero-Diatomic CoN4-NiN4 Site Pairs with Long-Range Coupling as Efficient Bifunctional Catalyst for Rechargeable Zn–Air Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2024-03-30 , DOI: 10.1002/advs.202310231
Yue Yang 1 , Bin Li 2 , Yining Liang 1 , Wenpeng Ni 3 , Xuan Li 1 , Gengzhe Shen 1 , Lin Xu 1 , Zhengjian Chen 1 , Chun Zhu 2 , Jin-Xia Liang 2 , Shiguo Zhang 3
Advanced Science ( IF 14.3 ) Pub Date : 2024-03-30 , DOI: 10.1002/advs.202310231
Yue Yang 1 , Bin Li 2 , Yining Liang 1 , Wenpeng Ni 3 , Xuan Li 1 , Gengzhe Shen 1 , Lin Xu 1 , Zhengjian Chen 1 , Chun Zhu 2 , Jin-Xia Liang 2 , Shiguo Zhang 3
Affiliation
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In this study, Co/Ni-NC catalyst with hetero-diatomic Co/Ni active sites dispersed on nitrogen-doped carbon matrix is synthesized via the controlled pyrolysis of ZIF-8 containing Co2+ and Ni2+ compounds. Experimental characterizations and theoretical calculations reveal that Co and Ni are atomically and uniformly dispersed in pairs of CoN4-NiN4 with an intersite distance ≈0.41 nm, and there is long-range d–d coupling between Co and Ni with more electron delocalization for higher bifunctional activity. Besides, the in situ grown carbon nanotubes at the edges of the catalyst particles allow high electronic conductivity for electrocatalysis process. Electrochemical evaluations demonstrate the superior ORR and OER bifunctionality of Co/Ni-NC catalyst with a narrow potential gap of only 0.691 V and long-term durability, significantly prevailing over the single-atom Co-NC and Ni-NC catalysts and the benchmark Pt/C and RuO2 catalysts. Co/Ni-NC catalyzed Zn–air batteries achieve a high specific capacity of 771 mAh g−1 and a long continuous operation period up to 340 h with a small voltage gap of ≈0.65 V, also much superior to Pt/C-RuO2.
中文翻译：
具有长程耦合的异质双原子 CoN4-NiN4 位点对作为可充电锌空气电池的高效双功能催化剂
本研究通过含有Co 2+和Ni 2+化合物的ZIF-8 的受控热解合成了分散在氮掺杂碳基质上的异双原子Co/Ni 活性位点的Co/Ni-NC 催化剂。实验表征和理论计算表明，Co和Ni原子均匀地分散在CoN 4 -NiN 4对中，位点间距约为0.41 nm，并且Co和Ni之间存在长程d - d耦合，并且电子离域更多。更高的双功能活性。此外，催化剂颗粒边缘的原位生长的碳纳米管为电催化过程提供了高电子传导性。电化学评估表明，Co/Ni-NC 催化剂具有优异的 ORR 和 OER 双功能，电位差仅为 0.691 V，并且具有长期耐用性，明显优于单原子 Co-NC 和 Ni-NC 催化剂以及基准 Pt /C和RuO 2催化剂。 Co/Ni-NC催化的锌空气电池实现了771 mAh g −1的高比容量和长达340 h的长连续工作时间，且电压间隙小至约0.65 V，也远优于Pt/C-RuO 2 .
更新日期：2024-03-30
中文翻译：
具有长程耦合的异质双原子 CoN4-NiN4 位点对作为可充电锌空气电池的高效双功能催化剂
本研究通过含有Co 2+和Ni 2+化合物的ZIF-8 的受控热解合成了分散在氮掺杂碳基质上的异双原子Co/Ni 活性位点的Co/Ni-NC 催化剂。实验表征和理论计算表明，Co和Ni原子均匀地分散在CoN 4 -NiN 4对中，位点间距约为0.41 nm，并且Co和Ni之间存在长程d - d耦合，并且电子离域更多。更高的双功能活性。此外，催化剂颗粒边缘的原位生长的碳纳米管为电催化过程提供了高电子传导性。电化学评估表明，Co/Ni-NC 催化剂具有优异的 ORR 和 OER 双功能，电位差仅为 0.691 V，并且具有长期耐用性，明显优于单原子 Co-NC 和 Ni-NC 催化剂以及基准 Pt /C和RuO 2催化剂。 Co/Ni-NC催化的锌空气电池实现了771 mAh g −1的高比容量和长达340 h的长连续工作时间，且电压间隙小至约0.65 V，也远优于Pt/C-RuO 2 .
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