Co/Ni dual-metal embedded in heteroatom doped porous carbon core-shell bifunctional electrocatalyst for rechargeable Zn-air batteries

Jun Li , Huaibin Xue , Nengneng Xu , Xiucheng Zhang , Yongxia Wang , Rui He , Haitao Huang , Jinli Qiao
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引用次数: 14

Abstract

Rational construction of highly efficient and cheap bifunctional electrocatalysts to boost both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is extremely essential for the wide application of rechargeable metal-air battery. In this work, we design a core-shell structural catalyst of CoNi dual-metal embedded in nitrogen doped porous carbon (NPC, CoNi@NPC), which is developed via the pyrolysis of CoNi-MOFs, assisting by mesoporous SiO2 to effectively inhibit the aggregation of metal sites. Consequently, the as-prepared CoNi@NPC manifests good ORR activity with half-wave potential up to 0.77 V. Specifically, the CoNi@NPC gives a very low OER over-potential of merely 101 mV in 6 M KOH along with high stability, outperforming the commercial Pt/C-RuO2. Moreover, the home-made zinc air battery with CoNi@NPC air cathode demonstrates excellent stability over long-term charging–discharging test, and delivers the maximum power density of 224 mW cm−2. The enhanced high performance of CoNi@NPC bifunctional catalyst for both ORR and OER can be ascribed to its unique core-shell structure and strong synergistic effect between the dual-bimetal active sites and the heteroatom doped carbon. This work opens a new avenue for the rational design of nonprecious metal bifunctional catalysts for rechargeable metal-air battery.

Abstract Image

用于可充电锌-空气电池的Co/Ni双金属嵌入杂原子掺杂多孔碳核壳双功能电催化剂
合理构建高效、廉价的双功能电催化剂来促进析氧反应和氧还原反应,对于可充电金属-空气电池的广泛应用至关重要。本研究设计了一种含氮掺杂多孔碳(NPC, CoNi@NPC)的CoNi双金属包埋核壳结构催化剂,该催化剂通过ni - mof的热解制备而成,通过介孔SiO2辅助有效抑制金属位点的聚集。因此,制备的CoNi@NPC具有良好的ORR活性,半波电位高达0.77 V。具体来说,CoNi@NPC在6 M KOH下的OER过电位仅为101 mV,具有很高的稳定性,优于商用Pt/C-RuO2。此外,自制的CoNi@NPC空气阴极锌空气电池在长期充放电试验中表现出优异的稳定性,其最大功率密度可达224 mW cm−2。CoNi@NPC双功能催化剂对ORR和OER的高性能增强可归因于其独特的核壳结构以及双双金属活性位点与杂原子掺杂碳之间的强协同效应。本研究为可充电金属-空气电池非贵金属双功能催化剂的合理设计开辟了新的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
材料导报:能源(英文)
材料导报:能源(英文) Renewable Energy, Sustainability and the Environment, Nanotechnology
CiteScore
13.00
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