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O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting
Nano Energy ( IF 16.8 ) Pub Date : 2018-10-10 , DOI: 10.1016/j.nanoen.2018.10.004
Khang Ngoc Dinh , Xiaoli Sun , Zhengfei Dai , Yun Zheng , Penglun Zheng , Jun Yang , Jianwei Xu , Zhiguo Wang , Qingyu Yan

Here we present a novel combined-strategy of cation tuning and surface engineering for the fabrication of highly active, earth-abundant, and robust two-dimensional Ni2P electrocatalyst. The nanosheets have lateral sizes of few hundred nm with thicknesses of ~6 nm. Our theoretical calculations suggest the effectiveness of vanadium doping and oxygen plasma, which do not only enhance the density-of-state at Fermi level, but also make the Ni sites more susceptible to OH adsorption. The oxygen plasma treatment can increase the wettability of the catalyst toward KOH solution, improving the contact angle from 44.95° to 16.8°, and also induce a higher BET surface area; hence, more active sites and lower charge transfer resistance are obtained. As a result, the catalyst requires small overpotentials of 257 and 108 mV to drive ±10 mA cm−2 alongside with modest Tafel slope of 43.5 and 72.3 mV dec−1 for oxygen evolution reaction and hydrogen evolution reaction in 1.0 M KOH solution, respectively. When employed for overall water splitting, the catalyst demonstrates a low voltage of 1.56 V to achieve 10 mA cm−2 with good stability and durability, outperforming the state-of-the-art IrO2 || Pt/C which needs 1.69 V. This work opens a new approach to engineer low-cost monometallic phosphides for highly efficient water splitting.



中文翻译:

O 2等离子体和阳离子调谐磷化镍纳米片可实现高效的总水分解

在这里,我们提出了一种阳离子调节和表面工程的新型组合策略,用于制造高活性,富含地球的,坚固的二维Ni 2 P电催化剂。纳米片的横向尺寸为几百纳米,厚度为〜6纳米。我们的理论计算表明钒掺杂和氧等离子体的有效性,这不仅增强在费米能级密度的状态,同时也使镍网站OH更容易-吸附。氧等离子处理可以提高催化剂对KOH溶液的润湿性,将接触角从44.95°改善到16.8°,还可以诱导更大的BET表面积;因此,获得了更多的活性位点和更低的电荷转移电阻。结果,该催化剂需要较小的257和108 mV的超电势来驱动±10 mA cm -2,同时在1.0 M KOH溶液中用于氧气析出反应和氢气析出反应的Tafel斜率分别为43.5和72.3 mV dec -1。 。当用于整体水分解时,该催化剂表现出1.56 V的低电压,可实现10 mA cm -2的稳定性和耐久性,优于最新的IrO 2|| 需要1.69 V的Pt / C。这项工作为工程设计低成本单金属磷化物提供了一种新方法,以实现高效的水分解。

更新日期:2018-10-10
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