Graphene-encapsulated cobalt nanoparticles embedded in porous nitrogen-doped graphitic carbon nanosheets as efficient electrocatalysts for oxygen reduction reaction
Graphene-encapsulated cobalt nanoparticles embedded in porous nitrogen-doped graphitic carbon nanosheets as efficient electrocatalysts for oxygen reduction reaction
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DOI：
10.1016/j.jcis.2019.05.099
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发表时间：
2019-09-15
影响因子：
9.9
通讯作者：
Wang, Ai-Jun
中科院分区：
文献类型：
--
作者：
Niu, Hua-Jie;Zhang, Lu;Wang, Ai-Jun
过渡金属和氮（N）掺杂碳材料因其天然丰富、稳定性好和能量转换效率高而被认为是氧还原反应（ORR）昂贵的铂基催化剂的有前途的替代品。在此，开发了一种简便高效的热解方法来制备嵌入多孔氮掺杂石墨碳纳米片（Co@G/N-GCNs）中的石墨烯封装的Co纳米颗粒（NP），其中g-C3N4作为C和N源，酞菁钴（CoPc）作为Co和N源。所得催化剂表现出优异的 ORR 活性（E-1/2 = 0.86 V vs. RHE）、良好的耐久性（2000 次循环后 E-1/2 负移 12 mV）和较强的耐甲醇性，在碱性条件下超过了商业 Pt/C 催化剂。热解温度和金属纳米颗粒的截留含量对 ORR 特征具有重要影响。这项工作为设计用于能量存储和转换的低成本非贵金属催化剂提供了可行的策略。 (C) 2019 Elsevier Inc. 保留所有权利。
Transition metal and nitrogen (N) doped carbon materials are regarded as promising alternatives to expensive Pt-based catalysts for oxygen reduction reaction (ORR), thanks to their natural abundance, good stability and high energy conversion efficiency. Herein, a facile efficient pyrolysis approach was developed to prepare graphene-encapsulated Co nanoparticles (NPs) embedded in porous nitrogen-doped graphitic carbon nanosheets (Co@G/N-GCNs), in which g-C3N4 served as C and N sources, and cobalt phthalocyanine (CoPc) as the Co- and N-sources. The as-obtained catalyst exhibited exceptional ORR activity (E-1/2 = 0.86 V vs. RHE), good durability (12 mV negative shift of E-1/2 after 2000 cycles), and strong methanol resistance, surpassing those of commercial Pt/C catalyst in alkaline conditions. The pyrolysis temperature and entrapped contents of metal NPs had critical impacts on the ORR features. This work offers a feasible strategy for designing low-cost non-noble-metal catalysts for energy storage and conversion. (C) 2019 Elsevier Inc. All rights reserved.