金属-载体相互作用增强了用于碱性氢氧化反应的镍基电催化剂的稳定性。
Metal-support interaction boosts the stability of Ni-based electrocatalysts for alkaline hydrogen oxidation.
作者信息
Tian Xiaoyu, Ren Renjie, Wei Fengyuan, Pei Jiajing, Zhuang Zhongbin, Zhuang Lin, Sheng Wenchao
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan, 430072, PR China.
出版信息
Nat Commun. 2024 Jan 2;15(1):76. doi: 10.1038/s41467-023-44320-w.
Ni-based hydrogen oxidation reaction (HOR) electrocatalysts are promising anode materials for the anion exchange membrane fuel cells (AEMFCs), but their application is hindered by their inherent instability for practical operations. Here, we report a TiO supported NiMo (NiMo/TiO) catalyst that can effectively catalyze HOR in alkaline electrolyte with a mass activity of 10.1 ± 0.9 A g and remain active even up to 1.2 V. The NiMo/TiO anode AEMFC delivers a peak power density of 520 mW cm and durability at 400 mA cm for nearly 100 h. The origin for the enhanced activity and stability is attributed to the down-shifted d band center, caused by the efficient charge transfer from TiO to Ni. The modulated electronic structure weakens the binding strength of oxygen species, rendering a high stability. The NiMo/TiO has achieved greatly improved stability both in half cell and single AEMFC tests, and made a step forward for feasibility of efficient and durable AEMFCs.
镍基氢氧化反应（HOR）电催化剂是用于阴离子交换膜燃料电池（AEMFC）的有前景的阳极材料，但其实际应用因固有的不稳定性而受阻。在此，我们报道了一种TiO负载的NiMo（NiMo/TiO）催化剂，该催化剂能在碱性电解质中有效催化HOR，质量活性为10.1±0.9 A g，甚至在高达1.2 V时仍保持活性。NiMo/TiO阳极AEMFC的峰值功率密度为520 mW cm，在400 mA cm下的耐久性接近100 h。活性和稳定性增强的原因归因于d带中心下移，这是由从TiO到Ni的有效电荷转移引起的。调制后的电子结构削弱了氧物种的结合强度，从而具有高稳定性。NiMo/TiO在半电池和单AEMFC测试中均实现了稳定性的大幅提高，为高效耐用AEMFC的可行性迈出了一步。
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