In Situ Synthesis of Co3O4 Nanoparticles on N-Doped Biochar as High-Performance Oxygen Reduction Reaction Electrocatalysts

被引：0

作者：

Matos, Renata ^{[1
]}

Manuel, Jorge V. ^{[1
]}

Fernandes, Antonio J. S. ^{[2
]}

Abdelkader-Fernandez, Victor K. ^{[3
]}

Peixoto, Andreia F. ^{[1
]}

Fernandes, Diana M. ^{[1
]}

机构：

[1] Univ Porto, Fac Ciencias, Dept Quim & Bioquim, REQUIMTE,LAQV, Rua Campo Alegre S N, P-4169007 Porto, Portugal

[2] Univ Aveiro, Dept Fis, Inst Nanoestrut Nanomodelacao & Nanofabricacao I3N, Campus Univ Santiago, Aveiro P-3810193, Portugal

[3] Univ Granada, Fac Ciencias, Dept Quim Inorgan, E-18071 Granada, Spain

来源：

CATALYSTS | 2024年 / 14卷 / 12期

关键词：

biochar; electrocatalyst; oxygen reduction; cobalt oxide; GRAPHITIC-NITROGEN; BIFUNCTIONAL ELECTROCATALYSTS; CARBON NANOSHEETS; SIZE DISTRIBUTION; GRAPHENE; CATALYSTS; OXIDE; ORR; SUPERCAPACITOR; PYROLYSIS;

D O I：

10.3390/catal14120951

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The development of sustainable and high-performance oxygen reduction reaction (ORR) electrocatalysts is fundamental to fuel cell implementation. Non-precious transition metal oxides present interesting electrocatalytic behavior, and their incorporation into N-doped carbon supports leads to excellent ORR performance. Herein, we prepared a shrimp shell-derived biochar (CC), which was doped with nitrogen via a ball milling approach (N-CC), and then used as support for Co3O4 nanoparticles growth (N-CC@Co3O4). Co3O4 loading was optimized using three different amounts of cobalt precursor: 1.56, 2.33 and 3.11 mmol in N-CC@Co3O4_1, N-CC@Co3O4_2 and N-CC@Co3O4_3, respectively. Interestingly, all prepared electrocatalysts, including the initial biochar CC, presented electrocatalytic activity towards ORR. Both N-doping and the introduction of Co3O4 NPs had a significant positive effect on ORR performance. Meanwhile, the three composites showed distinct ORR behavior, demonstrating that it is possible to tune their electrocatalytic performance by changing the Co3O4 loading. Overall, N-CC@Co3O4_2 achieved the most promising ORR results, displaying an Eonset of 0.84 V vs. RHE, jL of -3.45 mA cm-2 and excellent selectivity for the 4-electron reduction (n = 3.50), besides good long-term stability. These results were explained by a combination of high content of pyridinic-N and graphitic-N, high ratio of pyridinic-N/graphitic-N, and optimized Co3O4 loading interacting synergistically with the porous N-CC support.

引用

页数：17

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