Shi Fangbing, Huang Keke, Wang Ying, Zhang Wei, Li Liping, Wang Xiyang, Feng Shouhua
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , People's Republic of China.
ACS Appl Mater Interfaces. 2019 May 15;11(19):17459-17466. doi: 10.1021/acsami.9b04078. Epub 2019 May 6.
Spinel CoO, consisting of two mixed valence states, Co and Co, has attracted enormous interest as a promising electrocatalyst for oxygen evolution reaction (OER). Proper control on the relative proportion of Co/Co in cobalt oxide can greatly tune the electronic structure and further optimize its catalytic performance. Herein, a hybrid coupling CoO with black phosphorus (CoO@BP) is designed as an efficient catalyst for OER. Electron migration from BP to CoO is achieved in CoO@BP, owing to the higher Fermi level of BP than that of CoO. Efficient electron transfer can not only create massive active sites with abundant Co but also remarkably suppress the deterioration of BP. Particularly, the CoO@BP catalyst outperforms the pristine CoO by over four times and is even 20 times higher than that of bare BP at a potential of 1.65 V versus reversible hydrogen electrode. Our finding provides insightful understanding for electronic engineering in CoO@BP by balancing advantages and utilizing drawbacks of CoO and BP.
由两种混合价态的钴（Co²⁺ 和 Co³⁺）组成的尖晶石型氧化钴（Spinel CoO），作为一种有前景的析氧反应（OER）电催化剂，引起了人们的广泛关注。对氧化钴中 Co²⁺/Co³⁺ 的相对比例进行适当控制，可以极大地调节其电子结构，并进一步优化其催化性能。在此，一种将氧化钴与黑磷耦合的复合材料（CoO@BP）被设计为一种高效的析氧反应催化剂。在 CoO@BP 中实现了从黑磷到氧化钴的电子迁移，这是由于黑磷的费米能级高于氧化钴。高效的电子转移不仅可以产生大量富含 Co³⁺ 的活性位点，还能显著抑制黑磷的劣化。特别是，在相对于可逆氢电极 1.65 V 的电位下，CoO@BP 催化剂的性能比原始氧化钴高出四倍以上，甚至比裸黑磷高出 20 倍。我们的发现为通过平衡 CoO 和 BP 的优缺点对 CoO@BP 进行电子工程设计提供了深刻的理解。
