Adjustable anchoring of Ni/Co cations by oxygen-containing functional groups on functionalized graphite paper and accelerated mass/electron transfer for overall water splitting
Adjustable anchoring of Ni/Co cations by oxygen-containing functional groups on functionalized graphite paper and accelerated mass/electron transfer for overall water splitting
复制标题
通过功能化石墨纸上的含氧官能团可调节镍/钴阳离子的锚定，并加速整体水分解的质量/电子传递
DOI：
10.1039/d0cy00181c
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发表时间：
2020-04-21
影响因子：
5
通讯作者：
Zhang, Yalan
中科院分区：
文献类型：
--
作者：
Huang, Yiyi;Sun, Lei;Zhang, Yalan
同时进行析氢和析氧反应的高效双功能电催化剂对水裂解制氢具有重要意义。在这里，我们报告了一个镍钴硫化物-镍钴氧化物异质界面（NCS-NCO）与一个独特的蜂窝网络的多孔纳米片支持功能化石墨纸（FGP）与含氧官能团。我们采用简单的电化学方法制备了FGP支撑电极，通过调节FGP表面含氧官能团的含量来确定最佳形貌，从而改善NCS-NCO/FGP的OER/HER动力学。该创新电极表现出极高的电催化活性，在10 mA cm（-2）的电流密度下，超低电位仅为1.481 V，用于整体水裂解，甚至优于RuO 2/FGP|| Pt/C/FGP电极（1.583 V）。结果表明，金属阳离子（Ni和Co）可以快速锚定，调节，并在FGP上生长。最佳的化学组成使催化剂具有独特的蜂窝网络，具有大量的活性位点，用于快速传质。此外，NCS-NCO的紧密接触异质界面促进了NCS、NCO和FGP之间的电子转移。本工作为构建高效、低成本的水裂解电催化剂提供了一种新的方法。
Highly efficient bifunctional electrocatalysts capable of simultaneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are very important for overall water splitting to produce hydrogen. Herein, we report a NiCo sulfide-NiCo oxide heterointerface (NCS-NCO) with a unique cellular network of porous nanosheets supported on functionalized graphite paper (FGP) with oxygen-containing functional groups. We use a simple electrochemical method to prepare the FGP support electrode, and regulate the content of oxygen-containing functional groups on the surface of FGP to determine the optimum morphology, and thereby improve the OER/HER dynamics for NCS-NCO/FGP. This innovative electrode exhibits extremely high electrocatalytic activity with an ultra-low potential of only 1.481 V at a current density of 10 mA cm(-2) for overall water splitting, even better than a RuO2/FGP||Pt/C/FGP electrode (1.583 V). The results demonstrate that metal cations (Ni and Co) can be quickly anchored, regulated, and grown on FGP. The optimum chemical composition allows the catalyst to have a unique cellular network with large numbers of active sites for fast mass transfer. Moreover, the close-contact heterointerface of NCS-NCO promotes the electron transfer among NCS, NCO, and FGP. This work provides a new method for constructing efficient and low-cost electrocatalysts for overall water splitting for industrial applications.