Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation.

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation.
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DOI:
10.1126/sciadv.abm3779
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发表时间:
2022-06-03
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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阴离子交换膜燃料电池受到碱性氢氧化反应(HOR)缓慢动力学的限制。在这里,我们建立了单原子和双原子位点的 HOR 催化活性作为 *H 和 *OH 结合能的函数,以筛选 HOR 的最佳活性位点。结果,Ru-Ni双原子被确定为最佳活性中心。在理论发现的指导下,我们随后合成了一种负载在氮掺杂多孔碳上的Ru-Ni双原子位点催化剂,该催化剂表现出优异的催化活性、CO耐受性和对碱性HOR的稳定性,并且也优于单中心催化剂。原位扫描电化学显微镜研究验证了 Ru-Ni 双原子位点产生的 HOR 活性。此外,原位X射线吸收光谱和计算研究揭示了Ru和Ni之间的协同相互作用,可促进分子H2解离并加强双原子位点处的OH吸附,从而增强HOR的动力学。 Ru-Ni双原子位点可以有效催化碱性氢氧化,具有高活性、CO耐受性和稳定性。
Anion exchange membrane fuel cells are limited by the slow kinetics of alkaline hydrogen oxidation reaction (HOR). Here, we establish HOR catalytic activities of single-atom and diatomic sites as a function of *H and *OH binding energies to screen the optimal active sites for the HOR. As a result, the Ru-Ni diatomic one is identified as the best active center. Guided by the theoretical finding, we subsequently synthesize a catalyst with Ru-Ni diatomic sites supported on N-doped porous carbon, which exhibits excellent catalytic activity, CO tolerance, and stability for alkaline HOR and is also superior to single-site counterparts. In situ scanning electrochemical microscopy study validates the HOR activity resulting from the Ru-Ni diatomic sites. Furthermore, in situ x-ray absorption spectroscopy and computational studies unveil a synergistic interaction between Ru and Ni to promote the molecular H2 dissociation and strengthen OH adsorption at the diatomic sites, and thus enhance the kinetics of HOR. Ru-Ni diatomic sites can effectively catalyze alkaline hydrogen oxidation with high activity, CO tolerance, and stability.
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