Ultrathin amorphous CoFeP nanosheets derived from CoFe LDHs by partial phosphating as excellent bifunctional catalysts for overall water splitting

析氧 双功能 催化作用 无定形固体 贵金属 过电位 材料科学 分解水 阳极 化学工程 电催化剂 电解水 无机化学 阴极 纳米技术 化学 电解 金属 电化学 冶金 电解质 电极 物理化学 有机化学 工程类 光催化 生物化学
作者
Wenqian Zhang,Yao Li,Lingxi Zhou,Qiaoji Zheng,Fengyu Xie,Kwok Ho Lam,Dunmin Lin
出处
期刊:Electrochimica Acta [Elsevier BV]
卷期号:323: 134595-134595 被引量:65
标识
DOI:10.1016/j.electacta.2019.134595
摘要

Non-noble-metal electrocatalysts of transition metal phosphides have been considered as promising catalysts for hydrogen evolution reaction (HER); however, their bifunctional catalytic activities are limited by unsatisfactory performance in oxygen evolution reaction (OER). Here we report ultrathin amorphous CoFeP nanosheets derived from CoFe layered double hydroxides (LDHs) as bifunctional electrocatalysts with a simple phosphorization method. The partial phosphating induced by sodium hypophosphite can greatly reduce the thickness of nanosheets and promote the polycrystalline nature of the materials, leading to more active sites exposed and faster electronic transport. The optimal levels of phosphating agents are 1.8 g for OER and 2.4 g for HER, respectively, etched by which the resultant CoFeP materials can exhibit excellent electrocatalytic performances toward OER, HER and overall water splitting in alkaline media. At the current densities of 100 and 20 mA cm−2, ultralow overpotentials of 242 and 80 mV are achieved for OER and HER, individually, which are 128 mV lower than RuO2 and 6 mV slightly lower than Pt, respectively. In a cell voltage of 1.62 V, the CoFeP materials reacted with 1.8 and 2.4 g phosphating agents and used as the anode and the cathode, respectively, can achieve 100 mA cm−2 current density and exhibit extraordinary durability for 30 h in overall water splitting. These superior electrocatalytic properties of ultrathin amorphous CoFeP nanosheets are comparable to those of state-of-the-art noble metal and other reported catalysts for OER, HER and overall water splitting. This work proposes a promising strategy for excellent bifunctional electrocatalysts by tailoring the morphology and crystallinity degree based on LDHs through a facile partial phosphating method.
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