ZIF-derived Co–N–C ORR catalyst with high performance in proton exchange membrane fuel cells

Wang, Ruixiang; Zhang, Pengyang; Wang, Yucheng; Wang, Yue-Sheng; Zaghib, Karim; Zhou, Zhi‐You

doi:10.1016/j.pnsc.2020.09.010

Cited by 48 publications

(35 citation statements)

References 40 publications

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“…Compared to simple physical mixing of metal ions with ZIF particles, the addition of metal ions during the growth process of ZIF particles results in a more uniform metal distribution. In one study, Wang et al [61] synthesized Co-doped ZIF precursors with Co 2+ uniformly dispersed in the framework by in situ addition of Co salt. One-step thermal activation of such Co-doped ZIF precursors with an optimized Co content led to a high-performance Co-N-C catalyst with atomically dispersed Co sites.…”

Section: Strategies To Design M-n-c Catalystsmentioning

confidence: 99%

“…Besides separating metal sites in a single ZIF particle, the isolation of ZIF particles could also prevent the aggregation of metals. For instance, Wang et al [61] reported a MOF-based Co-N-C catalyst, in which high specific surface area and porous structure of KJ600 distributed ZIF-8 particles evenly, thus preventing the aggregation of Co atoms during the pyrolysis process, leading to dense Co-N x active sites.…”

Section: Strategies To Design M-n-c Catalystsmentioning

confidence: 99%

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Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

et al. 2021

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kinetics of ORR is around five orders of magnitude slower than that of HOR, thereby requiring a much higher Pt loading in the cathode along with more active and durable ORR electrocatalysts than pure Pt catalysts. [1] This requirement presents challenges for the development of advanced cathode catalysts with lower cost, higher activity and higher durability than Pt. Meanwhile, traditional alkaline fuel cells (AFCs) working on concentrated 30−45% KOH electrolytes gained little attention for decades mainly due to their high sensitivity to atmospheric CO 2 . [2,3] The OH − ions in the electrolyte react with CO 2 and form K 2 CO 3 , which can precipitate out as solid crystals, blocking pores in the electrode and gas diffusion layer. In addition, the consumption of OH − reduces the conductivity of the electrolyte. This issue is addressed by replacing KOH solution with a solid anion exchange membrane (AEM) without mobile cations. An AMFC offers several important advantages over PEMFCs, including: 1) low dissolution rates of catalysts, allowing the use of less expensive Pt-free electrocatalysts; 2) wide selections of materials and components that are stable at high pH; and 3) inexpensive solid electrolytes that do not need fluorinated ionomers. Despite their promise, AMFCs are still in the early development stage and have not been systematically investigated due to the lack of highly conductive and durable AEMs. The recent development of highly conductive The rapid progress of proton exchange membrane fuel cells (PEMFCs) and alkaline exchange membrane fuel cells (AMFCs) has boosted the hydrogen economy concept via diverse energy applications in the past decades. For a holistic understanding of the development status of PEMFCs and AMFCs, recent advancements in electrocatalyst design and catalyst layer optimization, along with cell performance in terms of activity and durability in PEMFCs and AMFCs, are summarized here. The activity, stability, and fuel cell performance of different types of electrocatalysts for both oxygen reduction reaction and hydrogen oxidation reaction are discussed and compared. Research directions on the further development of active, stable, and low-cost electrocatalysts to meet the ultimate commercialization of PEMFCs and AMFCs are also discussed.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202006292.

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Section: Strategies To Design M-n-c Catalystsmentioning

confidence: 99%

Section: Strategies To Design M-n-c Catalystsmentioning

confidence: 99%

Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

et al. 2021

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“…然而, 这种高性能的催化剂却很不稳定, Fe 金属中心很容易与 ORR 副产物 H2O2 发生芬顿反应 ( Fe 2+ + H2O2 → Fe 3+ + OH -+ ·OH), 使得金属中心溶出、碳基底腐蚀, 导致 PEMFC 的稳定性无法满足商业需求 [11] . 相比之下, Co-N-C 催化剂在四电子 ORR 中也表现出优异的性能, 同时 Co-N-C 结构中 Co 3+ /Co 2+ 的平衡电势更高, 不易发生类芬顿反应, 相较于 Fe-N-C 材料更具优势 [12,13] . 据报道, 在 0.1 mol L -1 KOH 条件下, Co-N-C 电催化 ORR 可以达到 0.91 V 的半波电位和 1.0 V 的起始电位 [14] ；即使在更严苛的酸性条件下, 也可达到 0.83 V 的半波电位和 0.93 V 的起始电位 [15] .…”

Section: 剂(M-n-c)凭借其导电性强、原子利用率高、活unclassified

Recent progress in Co-N-C single-atom catalysts for the electrochemical oxygen reduction reaction

Wang¹,

Chen²,

Han³

et al. 2021

Sci. Sin.-Chim

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Cobalt-based single-atom catalyst supported on porous nitrogen-doped carbon (Co-N-C) has received extensive attention due to the excellent catalytic performance in the electrochemical oxygen reduction reaction (ORR). Co-N-C can catalyze ORR via different electron transfer pathways to generate water (H 2O) or hydrogen peroxide (H2O2), respectively. Therefore, the rational design of the active sites and the optimization of the catalytic conditions are the key factors in the development of metal-air batteries, fuel cells and chemical industry. However, the key factors determining the selectivity of the ORR are still undefined. This review reports the recent progress on Co-N-C single-atom catalysts for the electrochemical ORR. We will focus on the microenvironment of the singleatom sites and the test conditions for oxygen reduction reaction, with attention on the oxygen adsorption energy and reaction intermediate binding energy. Last, by highlighting the key factors for the selectivity determination, we wish to shed some light on the further development of Co-N-C for ORR.

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“…[43][44][45] More importantly, ZIFs are rich in nitrogen and can offer active center metals to afford high activity for fuel cells. [46][47][48][49] However, the calcination from ZIFs will destroy their ordered structure and porous morphology, leading to the poor ORR performance, which is attributed to the low graphitization, poor conductivity and electron migration ability of ZIFs materials. With NaCl as additives, porous Co/N co-doped catalysts were prepared by the calcination of ZIF-67, which showed excellent ORR performance.…”

Section: Introductionmentioning

confidence: 99%

Fe/Co/N–C/graphene derived from Fe/ZIF-67/graphene oxide three dimensional frameworks as a remarkably efficient and stable catalyst for the oxygen reduction reaction

Xiong

Chen

et al. 2022

RSC Adv.

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ZIF-derived Co–N–C ORR catalyst with high performance in proton exchange membrane fuel cells

Cited by 48 publications

References 40 publications

Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

Recent progress in Co-N-C single-atom catalysts for the electrochemical oxygen reduction reaction

Fe/Co/N–C/graphene derived from Fe/ZIF-67/graphene oxide three dimensional frameworks as a remarkably efficient and stable catalyst for the oxygen reduction reaction

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