Highly efficient and active Co-N-C catalysts for oxygen reduction and Zn–air batteries

IF 3.1 4区工程技术 Q3 ENERGY & FUELS

Frontiers in Energy Pub Date : 2024-01-15 DOI:10.1007/s11708-024-0928-6

Cong Lei, Rongzhong Yang, Jianan Zhao, Wenbin Tang, Fadong Miao, Qinghong Huang, Yuping Wu

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Abstract

In this study, the Lewis doping approach of polyaniline (PANI) was employed to fabricate cobait–nitrogen–carbon (Co-N-C) oxygen electrocatalysts for Zn–air batteries, aiming to enhance the active spots of Co-N-C. This resulting Co-N-C catalysts exhibited well-defined nanofiber networks, and the Brunauer-Emmett-Teller (BET) analysis confirmed their substantial specific surface area. Electrochemical experiments demonstrated that the Co-N-C catalysts achieved the half-wave potential (vs. RHE) of 0.85 V in alkaline medium, overcoming Pt/C and iron–nitrogen–carbon (Fe-N-C) counterparts in extended cycle testing with only a 25 mV change in a half-wave potential after 5000 cycles. Remarkably, the highest power density measured in the zinc (Zn)–air battery reached 227 mW/cm², a significant improvement over the performance of 101 mW/cm² of the platinum on activated carbon (Pt/C) catalyst. These findings highlight the advantageous stability enhancement associated with the utilization of Co in the Co-N-C catalysts.

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用于氧还原和锌-空气电池的高效活性 Co-N-C 催化剂

本研究采用聚苯胺（PANI）的路易斯掺杂法制备了用于锌-空气电池的钴-氮-碳（Co-N-C）氧电催化剂，旨在提高 Co-N-C 的活性点。所制备的 Co-N-C 催化剂呈现出界限分明的纳米纤维网络，布鲁纳-埃美特-泰勒（BET）分析证实了其巨大的比表面积。电化学实验表明，Co-N-C 催化剂在碱性介质中的半波电位（相对于 RHE）达到了 0.85 V，在延长的循环测试中超过了 Pt/C 和铁-氮-碳（Fe-N-C）催化剂，5000 次循环后半波电位仅有 25 mV 的变化。值得注意的是，在锌（Zn）-空气电池中测得的最高功率密度达到了 227 mW/cm2，与活性炭上铂（Pt/C）催化剂 101 mW/cm2 的性能相比有了显著提高。这些发现凸显了在 Co-N-C 催化剂中使用 Co 所带来的稳定性增强优势。

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来源期刊

Frontiers in Energy Energy-Energy Engineering and Power Technology

CiteScore

5.90

自引率

6.90%

发文量

708

期刊介绍： Frontiers in Energy, an interdisciplinary and peer-reviewed international journal launched in January 2007, seeks to provide a rapid and unique platform for reporting the most advanced research on energy technology and strategic thinking in order to promote timely communication between researchers, scientists, engineers, and policy makers in the field of energy. Frontiers in Energy aims to be a leading peer-reviewed platform and an authoritative source of information for analyses, reviews and evaluations in energy engineering and research, with a strong focus on energy analysis, energy modelling and prediction, integrated energy systems, energy conversion and conservation, energy planning and energy on economic and policy issues. Frontiers in Energy publishes state-of-the-art review articles, original research papers and short communications by individual researchers or research groups. It is strictly peer-reviewed and accepts only original submissions in English. The scope of the journal is broad and covers all latest focus in current energy research. High-quality papers are solicited in, but are not limited to the following areas: -Fundamental energy science -Energy technology, including energy generation, conversion, storage, renewables, transport, urban design and building efficiency -Energy and the environment, including pollution control, energy efficiency and climate change -Energy economics, strategy and policy -Emerging energy issue