使用涂碳镍阳极提高性能的完全不含贵金属的碱性燃料电池。
A completely precious metal-free alkaline fuel cell with enhanced performance using a carbon-coated nickel anode.
机构信息
College of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources, Wuhan University, Wuhan 430072, China.
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853.
出版信息
Proc Natl Acad Sci U S A. 2022 Mar 29;119(13):e2119883119. doi: 10.1073/pnas.2119883119. Epub 2022 Mar 21.
SignificanceWe present a groundbreaking advance in completely nonprecious hydrogen fuel cell technologies achieving a record power density of 200 mW/cm with Ni@CN anode and Co-Mn cathode. The 2-nm CN coating weakens the O-binding energy, which effectively mitigates the undesirable surface oxidation during hydrogen oxidation reaction (HOR) polarization, leading to a stable fuel cell operation for Ni@CN over 100 h at 200 mA/cm, superior to a Ni nanoparticle counterpart. Ni@CNx exhibited a dramatically enhanced tolerance to CO relative to Pt/C, enabling the use of hydrogen gas with trace amounts of CO, critical for practical applications. The complete removal of precious metals in fuel cells lowers the catalyst cost to virtually negligible levels and marks a milestone for practical alkaline fuel cells.
意义 我们在完全非贵金属氢燃料电池技术方面取得了突破性进展，实现了 Ni@CN 阳极和 Co-Mn 阴极的 200 mW/cm 的创纪录功率密度。2nm 的 CN 涂层削弱了 O 结合能，有效缓解了氢氧化反应 (HOR) 极化过程中表面氧化的不利影响，从而使 Ni@CN 在 200 mA/cm 下稳定运行超过 100 小时，优于 Ni 纳米颗粒对照物。Ni@CNx 对 CO 的耐受性相对于 Pt/C 有了显著提高，从而可以使用含有痕量 CO 的氢气，这对实际应用至关重要。燃料电池中贵金属的完全去除将催化剂成本降至几乎可以忽略不计的水平，标志着实用碱性燃料电池的一个里程碑。
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