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Design of Fe-Nx/Tungsten Carbide for Efficient Electrocatalyst Oxygen Reduction in Acidic Media
Israel Journal of Chemistry ( IF 2.3 ) Pub Date : 2021-09-13 , DOI: 10.1002/ijch.202100053 Qingxia Yang 1 , Lijuan He 1 , Chunyu Ke 1 , Jiaqiang Zhong 1 , Weihua Yang 1
Israel Journal of Chemistry ( IF 2.3 ) Pub Date : 2021-09-13 , DOI: 10.1002/ijch.202100053 Qingxia Yang 1 , Lijuan He 1 , Chunyu Ke 1 , Jiaqiang Zhong 1 , Weihua Yang 1
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Improving the activity and stability of Fe/N/C catalyst in oxygen reduction reaction (ORR) is a huge challenge in the commercial application of polymer electrolyte membrane fuel cells (PEMFCs). In the past decade, there have been significant break-throughs in the performance of transition metal catalysts, but little progress has been made in their stability. Herein, a zinc-based zeolite imidazole framework (ZIF-8) and tungsten carbide engaged strategy was reported to prepare Fe/N/C catalyst. Particularly, physical vapor deposition (PVD) was used to trap tungsten carbide nanoparticles with particle size of less than 3 nm limited into the FeNC catalytic micropores to synthesis composite catalyst (WC@FeNC). Compared with original Fe/N/C cata-lysts, confined WC nanoparticles in Fe/N/C porous has improved the ORR activity (2.7 mA mg−1 vs. 2.2 mA mg−1 at 0.85 V vs. RHE) as well as stability (decay 18.7 mV vs. 21.6 mV after 10 h charged) in 0.1 M H2SO4. This work puts forward some unique insights for improving the stability of transition metal oxygen reduction catalysts.
中文翻译：
Fe-Nx/碳化钨在酸性介质中高效电催化剂氧还原的设计
提高Fe/N/C催化剂在氧还原反应（ORR）中的活性和稳定性是聚合物电解质膜燃料电池（PEMFC）商业应用中的巨大挑战。近十年来，过渡金属催化剂的性能取得了重大突破，但其稳定性方面却进展甚微。本文报道了一种锌基沸石咪唑骨架（ZIF-8）和碳化钨接合策略来制备 Fe/N/C 催化剂。特别是，采用物理气相沉积（PVD）将粒径小于3 nm的碳化钨纳米颗粒捕获到FeNC催化微孔中，合成复合催化剂（WC@FeNC）。与原始 Fe/N/C 催化剂相比，Fe/N/C 多孔中的受限 WC 纳米粒子提高了 ORR 活性（0.85 V vs. RHE 时为 2.7 mA mg -1 vs. 2.2 mA mg -1）以及0.1 MH 2 SO 4中的稳定性（充电 10 小时后衰减 18.7 mV vs. 21.6 mV）。这项工作为提高过渡金属氧还原催化剂的稳定性提出了一些独特的见解。
更新日期：2021-09-13
中文翻译：
Fe-Nx/碳化钨在酸性介质中高效电催化剂氧还原的设计
提高Fe/N/C催化剂在氧还原反应（ORR）中的活性和稳定性是聚合物电解质膜燃料电池（PEMFC）商业应用中的巨大挑战。近十年来，过渡金属催化剂的性能取得了重大突破，但其稳定性方面却进展甚微。本文报道了一种锌基沸石咪唑骨架（ZIF-8）和碳化钨接合策略来制备 Fe/N/C 催化剂。特别是，采用物理气相沉积（PVD）将粒径小于3 nm的碳化钨纳米颗粒捕获到FeNC催化微孔中，合成复合催化剂（WC@FeNC）。与原始 Fe/N/C 催化剂相比，Fe/N/C 多孔中的受限 WC 纳米粒子提高了 ORR 活性（0.85 V vs. RHE 时为 2.7 mA mg -1 vs. 2.2 mA mg -1）以及0.1 MH 2 SO 4中的稳定性（充电 10 小时后衰减 18.7 mV vs. 21.6 mV）。这项工作为提高过渡金属氧还原催化剂的稳定性提出了一些独特的见解。
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