Three-dimensional structures of Mn doped CoP on flexible carbon cloth for effective oxygen evolution reaction
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ARTICLE Three-dimensional structures of Mn doped CoP on flexible carbon cloth for effective oxygen evolution reaction Jiajin Lin, Shilei Xie,a) Peng Liu, Min Zhang, Shoushan Wang, Peng Zhang, and Faliang Chengb) School of Environment and Civil Engineering, Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, China (Received 29 September 2017; accepted 6 November 2017)
The development of electrocatalysts with high activity and low cost has attracted growing attentions in recent years. Herein, we reported the Mn-doped CoP nanosheet arrays on flexible activated carbon cloth (Mn–CoP/CC) for the effective oxygen evolution reaction (OER) at low overpotential and high current density. Due to the novel 3D nanostructures of the carbon cloth and doping effect of the Mn element, the Mn doped CoP/CC electrode delivered the best overpotential of 317 mV for water splitting with the current density of 10 mA/cm2, a Tafel slope of ;65.1 mV/dec, and excellent stability over 16 h in 1.0 mol/L KOH, which is superior or comparable to the most of the reported cobalt-based catalysts. Thus outstanding electrocatalytic performance originates from the Mn doping effect, which resulted in increased surface area and fast charge-transfer. It is believed that these findings would help us to develop high effective and stable electrocatalysts for water splitting.
I. INTRODUCTION
Contributing Editor: Teng Zhai Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: chengfl@dgut.edu.cn DOI: 10.1557/jmr.2017.450
important to design and synthesize cheap, durable, and highly effective OER catalysts. Transition-metal phosphide (TMP) has emerged as one of the most important non-noble-metal electrocatalysts. Recently, metal phosphides, such as FeP, Ni2P, NiP, Co2P, and CoP, have shown their potential for the fabrication of low-cost and highly active water splitting catalysts.16–21 For example, Du et al.16 first reported the synthesis of noble-metal-free nickel phosphide (Ni2P) nanowires and explored its catalytic performance for water oxidation. The Ni2P nanowire electrode achieved the lowest onset potential of around 1.54 V [versus reversible hydrogen electrode (RHE)] and a Tafel slope of 60 mV/dec in 1.0 mol/L KOH solution. Wang et al.22 reported a new type of Ni2P–CoP hybrid nanosheet arrays on flexible carbon cloth (Ni2P–CoP HNSAs/CC) for the hydrogen evolution reaction. Due to the special surface effects of hybrid nanosheet arrays and synergistic effects between Ni2P and CoP, the Ni2P–CoP HNSAs/CC showed excellent electrocatalytic performance for the hydrogen evolution reaction in both acid and alkaline solutions. Compared to these TMPs, the present CoP nanomaterials displayed efficient and durable electrocatalytic activity toward the hydrogen evolution reaction at cathodic potentials in alkaline solutions. However, the OER performance of these CoP nanomaterials was dissatisfactory since they suffered dramatic metamorphosis, morphology transfor
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