Hughes Jack P, Blanco Felipe D, Banks Craig E, Rowley-Neale Samuel J
Faculty of Science and Engineering, Manchester Metropolitan University Chester Street Manchester M1 5GD UK
Manchester Fuel Cell Innovation Centre, Manchester Metropolitan University Chester Street Manchester M1 5GD UK.
RSC Adv. 2019 Aug 12;9(43):25003-25011. doi: 10.1039/c9ra05342e. eCollection 2019 Aug 8.
A screen-printable ink that contained varying percentage mass incorporations of two dimensional tungsten disulphide (2D-WS) was produced and utilized to fabricate bespoke printed electrodes (2D-WS-SPEs). These WS-SPEs were then rigorously tested towards the Hydrogen Evolution Reaction (HER) within an acidic media. The mass incorporation of 2D-WS into the 2D-WS-SPEs was found to critically affect the observed HER catalysis with the larger mass incorporations resulting in more beneficial catalysis. The optimal (largest possible mass of 2D-WS incorporation) was the 2D-WS-SPE, which displayed a HER onset potential, Tafel slope value and Turn over Frequency (ToF) of -214 mV ( RHE), 51.1 mV dec and 2.20 , respectively. These values significantly exceeded the HER catalysis of a bare/unmodified SPE, which had a HER onset and Tafel slope value of -459 mV ( RHE) and 118 mV dec, respectively. Clearly, indicating a strong electrocatalytic response from the 2D-WS-SPEs. An investigation of the signal stability of the 2D-WS-SPEs was conducted by performing 1000 repeat cyclic voltammograms (CVs) using a 2D-WS-SPE as a representative example. The 2D-WS-SPE displayed remarkable stability with no variance in the HER onset potential of -268 mV ( RHE) and a 44.4% increase in the achievable current over the duration of the 1000 CVs. The technique utilized to fabricate these 2D-WS-SPEs can be implemented for a plethora of different materials in order to produce large numbers of uniform and highly reproducible electrodes with bespoke electrochemical signal outputs.
制备了一种可丝网印刷的墨水，其中含有不同质量百分比的二维二硫化钨（2D-WS），并用于制造定制的印刷电极（2D-WS-SPEs）。然后在酸性介质中对这些WS-SPEs进行了严格的析氢反应（HER）测试。发现2D-WS在2D-WS-SPEs中的质量掺入对观察到的HER催化有至关重要的影响，较大的质量掺入导致更有利的催化。最佳的（2D-WS掺入的最大可能质量）是2D-WS-SPE，其HER起始电位、塔菲尔斜率值和周转频率（ToF）分别为-214 mV（相对于可逆氢电极，RHE）、51.1 mV/dec和2.20。这些值显著超过了裸/未修饰SPE的HER催化性能，其HER起始电位和塔菲尔斜率值分别为-459 mV（RHE）和118 mV/dec。显然，这表明2D-WS-SPEs有很强的电催化响应。以2D-WS-SPE为代表，通过进行1000次重复循环伏安图（CVs）来研究2D-WS-SPEs的信号稳定性。2D-WS-SPE显示出显著的稳定性，HER起始电位为-268 mV（RHE）没有变化，并且在1000次CVs期间可实现的电流增加了44.4%。用于制造这些2D-WS-SPEs的技术可用于多种不同材料，以生产大量具有定制电化学信号输出的均匀且高度可重复的电极。
