Yu Jie, Sunarso Jaka, Zhu Yinlong, Xu Xiaomin, Ran Ran, Zhou Wei, Shao Zongping
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing, 210009, P.R. China.
Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
Chemistry. 2016 Feb 18;22(8):2719-27. doi: 10.1002/chem.201504279. Epub 2016 Jan 20.
Increasing energy demands have stimulated intense research activity on cleaner energy conversion such as regenerative fuel cells and reversible metal-air batteries. It is highly challenging but desirable to develop low-cost bifunctional catalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), the lack of which is currently one of the major limiting components towards commercialization of these technologies. Here, we have conducted a systematic study on the OER and ORR performances of the Ruddlesden-Popper family of La(n+1)Ni(n) O(3n+1) (n=1, 2, 3, and ∞) in an alkaline medium for the first time. It is apparent that the Ni-O bond lengths and the hyperstoichiometric oxides in the rock-salt layers correlate with the ORR activities, whereas the OER activities appear to be influenced by the OH(-) content on the surface of the compounds. In our case, the electronic configuration fails to predict the electrocatalytic activity of these compounds. This work provides guidelines to develop new electrocatalysts with improved performances.
不断增长的能源需求激发了对清洁能源转换的深入研究，如再生燃料电池和可逆金属空气电池。开发用于氧还原反应（ORR）和析氧反应（OER）的低成本双功能催化剂极具挑战性但却十分必要，目前缺乏此类催化剂是这些技术商业化的主要限制因素之一。在此，我们首次对层状钙钛矿型La(n+1)Ni(n)O(3n+1)（n = 1、2、3和∞）在碱性介质中的OER和ORR性能进行了系统研究。很明显，岩盐层中的Ni-O键长和过化学计量氧化物与ORR活性相关，而OER活性似乎受化合物表面OH(-)含量的影响。在我们的研究中，电子构型无法预测这些化合物的电催化活性。这项工作为开发性能更优的新型电催化剂提供了指导。
