Directly ball milling red phosphorus and expended graphite for oxygen evolution reaction
Directly ball milling red phosphorus and expended graphite for oxygen evolution reaction
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直接球磨红磷和膨胀石墨进行析氧反应
DOI：
10.1016/j.jpowsour.2020.228003
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发表时间：
2020-04-30
影响因子：
9.2
通讯作者：
Xu, Qun-Jie
中科院分区：
文献类型：
--
作者：
Bai, Kangkang;Fan, Jin-Chen;Xu, Qun-Jie
析氧反应（OER）电催化在清洁和可再生能源转化中发挥着重要作用。设计高性能的OER电催化剂是实现高电化学活性的关键。无贵金属电化学OER电催化剂成为主要趋势。本文报道了一种简便的球磨法制备用于OER电催化的红磷(BP)-黑磷(BP)/膨胀石墨（EG）。利用球磨过程中产生的高温和剪切力，一部分红磷可以原位转移到化学活性BP中，形成RP-BP异质结构。同时，通过P-C和P-O-C键与RP-BP异质结构发生反应，将EG薄片切割剥离成富含缺陷的石墨烯纳米片和EG薄片。RP-BP和EG的杂化提高了电导率，促进了OER电催化活性位点的增加。结果表明，RP-BP/EG异质结构在电流密度为10 mA cm（-2）时表现出良好的OER性能，过电位为328 mV（相对于RHE），低于商用IrO2 （330 mV相对于RHE， 10 mA cm(-2)）。非常小的Tafel斜率为58 mV.dec(-1)，表明RP-BP/EG催化剂上的电子透射率很高。RP-BP/EG稳定的结构保证了RP-BP/EG催化剂在OER中的长期耐久性。
Oxygen evolution reaction (OER) electmcatalysis plays an important role in clean and renewable energy conversion. Designing high-performance OER electrocatalyst is key to the high electrochemical activity. Noblemetal-free electrochemical OER electmcatalysts become the major trend. Herein, we report a facile ballmilling method to prepare red phosphorus (BP)-black phosphorus (BP)/expended graphite (EG) toward OER electrocatalysis. By virtue of the high temperature and shearing force generated in the ball-milling process, a portion of red phosphorus can be in-situ transferred into chemical active BP and formed the RP-BP heterostructure. Meantime, the EG flakes are cut and exfoliated into defect-rich graphene nanosheets and thin EG flakes, reacting with the RP-BP heterostructure through P-C and P-O-C bonds. The hybridization of RP-BP and EG improves the electroconductivity and facilitate more active electrocatalytic sites toward OER. The results demonstrate that RP-BP/EG heterostructure shows good OER performance with a low overpotential of 328 mV vs. RHE) at a current density of 10 mA cm(-2), lower than commercial IrO2 (330 mV vs. RHE, 10 mA cm(-2)). A very small Tafel slope of 58 mV.dec(-1) indicates the high electron transmission on the RP-BP/EG catalyst. The stable structure of RP-BP/EG provides the long-term durability of the RP-BP/EG catalysts in OER.