1成果简介
探索柔性、多孔、高效和稳定的阴极电催化剂对于开发ZAB至关重要。本文,兰州交通大学Linwei Zhang等研究人员在《Carbon》期刊发表名为“A Flexible Porous Electrospun Carbon Nanofiber Cathode Catalyst for Rechargeable Liquid and Flexible Zn-Air Batteries”的论文,研究通过电纺丝成功构建了一种有效的多孔柔性碳纳米纤维催化剂(Fe-ZCNF)。该催化剂以 PAN 为纺丝基底材料,并加入庚胺以形成主要活性位点,同时采用 NaCl 熔盐辅助 ZIF-8 模板策略形成连通的孔隙结构。Fe-ZCNF 具有相互连接的分层多孔结构,比表面积高达1035.5m2 g-1。与商用Pt/C(20 wt%)相比,Fe-ZCNF ORR的 E1/2=0.88V vs. RHE正向移动了20mV,稳定性显著提高。此外,Fe-ZCNF还可用作FZAB的空气阴极,在不同的弯曲条件下表现出高比容量和良好的循环稳定性。这项研究为柔性催化剂的设计提供了宝贵的见解,有望推动柔性电子器件的发展。
2图文导读
方案一. Preparation Process of Fe-ZCNF.
图1. (a) SEM image, (b) high-resolution SEM image, (c, d) corresponding HAADF image and elemental mapping, (e) TEM image, (f, g) HRTEM images of Fe-ZCNF.
图2. (a) N2 adsorption-desorption isotherms, (b) pore size distribution curves, (c) XRD patterns, (d) Raman spectra, (e) XPS survey spectra and (f) N 1s XPS spectra.
图3. (a) Comparative CV analysis of the catalysts in O2-saturated electrolyte, (b) LSV curves in O2-saturated electrolyte at 1600 rpm, (c) Tafel plots, (d) LSV curves of Fe-ZCNF at different rotation speeds, inset: the K-L plot, (e) H2O2 yields andnvalues of catalysts, (f) EIS curves with fitted equivalent circuit, (g) LSV curves initially and after 15,000 potential cycles, (h) chronoamperometric (i-t) response at 1600 rpm over 50,000 s, and (i) LSV curves in 1 M KOH solution for OER.
图4. (a) Schematic illustration of the Liquid ZABs, (b) OCV curves, (inset: open circuit voltage and light-emitting tungsten lamp powered by two ZABs connected in series), (c) specific capacity curves at current densities of 10 mA cm-2 and 20 mA cm-2, (d) discharge polarization and corresponding power density curves, and (e) galvanostatic charge-discharge voltage cycling curve at 10 mA cm-2.
图5. (a) Schematic illustration of the FZAB with Fe-ZCNF as the air cathode, (b) OCV curve (inset: open circuit voltage and light-emitting tungsten lamp powered by two FZABs connected in series), (c) discharge polarization and corresponding power density curves, (d) specific capacity curve at current density of 5 mA cm-2, and (e) galvanostatic charge-discharge voltage cycling curve at 2 mA cm-2 under different bending angles.
3小结
总之,这项研究报告了一种方便、合理和可扩展的策略,用于制造灵活、催化剂性能高的多孔碳纳米纤维基催化剂,这种催化剂可用作 ZAB 和 FZAB 的阴极催化剂。相互连接的分层多孔结构有利于电催化过程中的传质,再加上大量可访问的高活性位点(Fe3C和Fe-Nx),使得制备的Fe-ZCNF在ORR(E1/2=0.88Vvs. RHE)中表现出优异的电催化性能,在OER(过电势为 400 mV)中表现出可接受的催化能力。Fe-ZCNF 还具有疏水性和良好的导电性,有利于组装电池中的空气传导和电子转移。因此,用 Fe-ZCNF 组装的 ZAB的OCV为1.59 V,功率密度为179.2mW cm-2,在 600 次循环后仍能保持稳定的充放电性能,明显优于用商用 Pt/C+RuO2 组装的 ZAB。同时,由于制备的催化剂具有良好的柔韧性,使用 Fe-ZCNF 也组装出了 FZABs。使用 Fe-ZCNF 组装的 FZAB 的 OCV 为 1.51 V,功率密度为136.0mW cm-2,在各种弯曲角度下都能保持稳定的充放电性能。此外,用Fe-ZCNF作为自支撑材料组装的 FZAB 也表现出良好的性能。因此,这项研究为ZABs(尤其是 FZABs)的发展带来了巨大的潜力,有望推动柔性器件的未来发展。
文献:
https://doi.org/10.1016/j.carbon.2025.120372
来源:材料分析与应用
特别声明:以上内容(如有图片或视频亦包括在内)为自媒体平台“网易号”用户上传并发布,本平台仅提供信息存储服务。
Notice: The content above (including the pictures and videos if any) is uploaded and posted by a user of NetEase Hao, which is a social media platform and only provides information storage services.