钴（II）螯合聚亚胺作为阴离子交换膜燃料电池中的氧还原反应催化剂。

Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells.

作者信息

Huang Yu-Chang, Wang Yen-Zen, Hsieh Tar-Hwa, Ho Ko-Shan

机构信息

Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, 415, Chien-Kuo Road, Kaohsiung 80782, Taiwan.

Department of Chemical and Materials Engineering, National Yu-Lin University of Science & Technology, 123, Sec. 3, University Road, Dou-Liu City, Yun-Lin 64301, Taiwan.

出版信息

Membranes (Basel). 2023 Aug 30;13(9):769. doi: 10.3390/membranes13090769.

DOI:10.3390/membranes13090769

PMID:37755192

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10536383/

Abstract

In this paper, a cobalt (Co)-chelated polynaphthalene imine (Co-PNIM) was calcined to become an oxygen reduction reaction (ORR) electrocatalyst (Co-N-C) as the cathode catalyst (CC) of an anion exchange membrane fuel cell (AEMFC). The X-ray diffraction pattern of CoNC-1000A900 illustrated that the carbon matrix develops clear C(002) and Co(111) planes after calcination, which was confirmed using high-resolution TEM pictures. Co-N-Cs also demonstrated a significant ORR peak at 0.8 V in a C-V (current vs. voltage) curve and produced an extremely limited reduction current density (5.46 mA cm) comparable to commercial Pt/C catalysts (5.26 mA cm). The measured halfway potential of Co-N-C (0.82 V) was even higher than that of Pt/C (0.81 V). The maximum power density (P) of the AEM single cell upon applying Co-N-C as the CC was 243 mW cm, only slightly lower than that of Pt/C (280 mW cm). The Tafel slope of CoNC-1000A900 (33.3 mV dec) was lower than that of Pt/C (43.3 mV dec). The limited reduction current density only decayed by 7.9% for CoNC-1000A900, compared to 22.7% for Pt/C, after 10,000 redox cycles.

摘要

在本文中，将钴（Co）螯合的聚萘二亚胺（Co-PNIM）煅烧成为氧还原反应（ORR）电催化剂（Co-N-C），用作阴离子交换膜燃料电池（AEMFC）的阴极催化剂（CC）。CoNC-1000A900的X射线衍射图谱表明，煅烧后碳基体形成了清晰的C(002)和Co(111)平面，这一点通过高分辨率透射电镜图片得到了证实。Co-N-C在C-V（电流与电压）曲线中也在0.8 V处显示出明显的ORR峰，并且产生的还原电流密度极低（5.46 mA cm），与商业Pt/C催化剂（5.26 mA cm）相当。测得的Co-N-C的半波电位（0.82 V）甚至高于Pt/C的半波电位（0.81 V）。将Co-N-C用作阴极催化剂时，AEM单电池的最大功率密度（P）为243 mW cm，仅略低于Pt/C的最大功率密度（280 mW cm）。CoNC-1000A900的塔菲尔斜率（33.3 mV dec）低于Pt/C的塔菲尔斜率（43.3 mV dec）。在10,000次氧化还原循环后，CoNC-1000A900的有限还原电流密度仅衰减了7.9%，而Pt/C衰减了22.7%。