Department of Chemistry, William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong).
Angew Chem Int Ed Engl. 2014 Jul 14;53(29):7584-8. doi: 10.1002/anie.201402822. Epub 2014 Jun 6.
Cost-effective electrocatalysts for the oxygen evolution reaction (OER) are critical to energy conversion and storage processes. A novel strategy is used to synthesize a non-noble-metal-based electrocatalyst of the OER by finely combining layered FeNi double hydroxide that is catalytically active and electric conducting graphene sheets, taking advantage of the electrostatic attraction between the two positively charged nanosheets. The synergy between the catalytic activity of the double hydroxide and the enhanced electron transport arising from the graphene resulted in superior electrocatalytic properties of the FeNi-GO hybrids for the OER with overpotentials as low as 0.21 V, which was further reduced to 0.195 V after the reduction treatment. Moreover, the turnover frequency at the overpotential of 0.3 V has reached 1 s(-1), which is much higher than those previously reported for non-noble-metal-based electrocatalysts.
用于析氧反应 (OER) 的具有成本效益的电催化剂对于能量转换和存储过程至关重要。通过巧妙地结合具有催化活性和导电性的层状 FeNi 双氢氧化物和带正电荷的石墨烯片，利用两者之间的静电吸引力，提出了一种合成基于非贵金属的 OER 电催化剂的新策略。双氢氧化物的催化活性与石墨烯增强的电子输运之间的协同作用使 FeNi-GO 杂化物具有出色的 OER 电催化性能，过电势低至 0.21 V，经过还原处理后进一步降低至 0.195 V。此外，在 0.3 V 的过电势下的 turnover frequency 达到了 1 s(-1)，远高于之前报道的基于非贵金属的电催化剂。
