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Phosphorus-Accumulating Organism Assisted Phosphorization of Ni-Fe Nanocomposites for Efficient Oxygen Evolution Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-08 , DOI: 10.1021/acssuschemeng.0c04551
Lei He 1 , Zheng-Hao Li 1, 2 , Miao Gao 1 , Guo-Ping Sheng 1, 2
Affiliation  

Developing high-efficiency and low-cost non-noble-metal electrocatalysts for the oxygen evolution reaction (OER) is vital due to its important role in renewable energy technologies, which still remains a big challenge. Transition-metal phosphides have been proved as promising OER catalysts. Herein, we fabricated P-functionalized Ni-Fe nanocomposites as an efficient OER catalyst using phosphorus-accumulating organisms (PAOs; a type of bacteria with a high content of phosphorus) as the phosphorus source and carbon precursors. The Ni-Fe nanoparticles were highly dispersed on the carbon matrix due to the polyphosphate-confined effect of nickel and iron ions. The prepared P-functionalized Ni-Fe nanocomposites required an overpotential of only 268 mV on a glassy carbon electrode and only 137 mV on nickel foam to achieve 10 mA cm–2 for the OER, values much lower than those of currently reported NiFe-based OER catalysts. The high catalytic activity of the P-functionalized Ni-Fe nanocomposites was ascribed to good dispersion of Ni and Fe, facile electron transfer, enhanced conductivity and wettability. Therefore, this work provides an efficient and low-cost OER electrocatalyst for practical application.

中文翻译:

Ni-Fe纳米复合材料的磷富集生物辅助磷化作用,可进行有效的放氧反应

由于氧气在可再生能源技术中的重要作用,因此开发用于氧气析出反应(OER)的高效,低成本非贵金属电催化剂至关重要,而这仍然是一个巨大的挑战。过渡金属磷化物已被证明是有前途的OER催化剂。本文中,我们使用磷积累生物(PAOs;一种磷含量高的细菌)作为磷源和碳前体,制备了P-官能化的Ni-Fe纳米复合材料,作为高效的OER催化剂。由于镍和铁离子的多磷酸盐限制作用,Ni-Fe纳米颗粒高度分散在碳基质上。制备的P-官能化的Ni-Fe纳米复合材料在玻璃碳电极上仅需268 mV的过电位,而在泡沫镍上仅需137 mV的过电位即可达到10 mA cmOER的值为–2,远低于目前报道的基于NiFe的OER催化剂的值。P-官能化的Ni-Fe纳米复合材料的高催化活性归因于Ni和Fe的良好分散性,容易的电子转移,增强的电导率和润湿性。因此,这项工作为实际应用提供了一种高效且低成本的OER电催化剂。
更新日期:2020-08-03
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