Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides
Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides
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DOI：
10.1038/s41467-019-09666-0
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发表时间：
2019-04-12
影响因子：
16.6
通讯作者：
Sun, Xiaoming
中科院分区：
文献类型：
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作者：
Li, Pengsong;Wang, Maoyu;Sun, Xiaoming
单原子催化剂是将分离的金属原子单独分散在载体上的催化剂，在杂催化和电催化中具有很高的活性和选择性。然而，单原子的活性和稳定性以及它们与载体的相互作用仍然是一个谜。在这里，我们展示了一种稳定的单原子钌催化剂锚定在钴铁层状双氢氧化物表面，它在钌和层状双氢氧化物之间具有很强的电子耦合。当钌含量为0.45 wt.%时，催化剂在电流密度为10 mA cm（-2）时的过电位为198 mV，出氧反应的Tafel斜率为39 mV dec（-1）。利用operando x射线吸收光谱研究发现，分离的单原子钌由于协同电子耦合，即使在高过电位下也能保持在4+的氧化态，从而同时具有优异的电催化活性和稳定性。
Single atom catalyst, which contains isolated metal atoms singly dispersed on supports, has great potential for achieving high activity and selectivity in hetero-catalysis and electrocatalysis. However, the activity and stability of single atoms and their interaction with support still remains a mystery. Here we show a stable single atomic ruthenium catalyst anchoring on the surface of cobalt iron layered double hydroxides, which possesses a strong electronic coupling between ruthenium and layered double hydroxides. With 0.45 wt.% ruthenium loading, the catalyst exhibits outstanding activity with overpotential 198 mV at the current density of 10 mA cm(-2) and a small Tafel slope of 39 mV dec(-1) for oxygen evolution reaction. By using operando X-ray absorption spectroscopy, it is disclosed that the isolated single atom ruthenium was kept under the oxidation states of 4+ even at high overpotential due to synergetic electron coupling, which endow exceptional electrocatalytic activity and stability simultaneously.