A WOx mediated interface boosts the activity and stability of Pt-catalyst for alkaline water splitting
A WOx mediated interface boosts the activity and stability of Pt-catalyst for alkaline water splitting
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DOI：
10.1016/j.cej.2021.133287
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发表时间：
2021-11
影响因子：
15.1
通讯作者：
Di Yin;Yundong Cao;Dongfeng Chai;Lin-lin Fan;Guang-gang Gao;Mingliang Wang;Hong Liu;Zhenhui Kang-Zh
中科院分区：
文献类型：
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作者：
Di Yin;Yundong Cao;Dongfeng Chai;Lin-lin Fan;Guang-gang Gao;Mingliang Wang;Hong Liu;Zhenhui Kang-Zh
水裂解制氢是一种清洁的制氢方法，高效的催化剂界面是靴子水裂解制氢活性和稳定性的关键因素之一。本文以多钨酸盐（POT）为前驱体，制备了由Pt、WOx和石墨烯（Pt-WO 3 −x@rGO）组成的Pt基双功能催化剂。Pt-WO 3 −x@rGO（1.58%Pt负载量）催化剂表现出增强的催化活性，即析氢反应（HER）的过电位为37 mV，析氧反应（OER）的过电位为174 mV，并且在10 mA cm− 2下实现了1.55 V的碱性介质中水裂解的工作电压。电化学分析和密度泛函理论计算表明，WOx介导的界面（Pt 0-WOx-O-W）在增强电子转移和降低HER和OER的活化能方面起着关键作用.此外，这种Pt 0-Al 2 O3-O-W界面显著提高了Pt基催化剂在碱性介质中的稳定性。
Water splitting offers a clean way to produce hydrogen, in which, an efficient catalyst interface is one of the key factors to boot the activity and stability. Here, using polyoxotungstate (POT) as precursor, Pt-based bifunctional catalysts were fabricated, which are composed of Pt, WOxand graphene (Pt-WO3−x@rGO). The Pt-WO3−x@rGO (1.58% Pt-loading) catalyst shows an enhanced catalytic activity, namely, overpotentials of 37 mV for Hydrogen evolution reaction (HER) and 174 mV for Oxygen evolution reaction (OER), and achieves a working voltage of 1.55 V at 10 mA cm−2for water splitting in alkaline-medium. Electrochemical analyses and DFT calculation suggest that the WOxmediated interface (Pt0⋅⋅⋅O − W) plays a key role to enhance the electron transfer and reduce the activation energy for both HER and OER. Moreover, this kind of Pt0⋅⋅⋅O − W interface enhances the Pt based catalyst stability in alkaline-medium significantly.