State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, Hubei, China.
Nanoscale. 2018 May 31;10(21):9856-9861. doi: 10.1039/c8nr02436g.
The stability of non-precious metal-based electrocatalysts for the acidic hydrogen evolution reaction (HER) is of great importance. Here, we have used nickel cyclotetraphosphate (Ni2P4O12) nanosheet arrays as a HER electrocatalyst for the first time. The Ni2P4O12 arrays were obtained through a facile low-temperature phosphorylation process and possess superior HER catalytic activities and stability in acid. The Ni2P4O12 delivers a small overpotential of 131.8 mV at -10 mA cm-2 and a low Tafel slope of 47.8 mV dec-1 in 0.5 M H2SO4, comparable to most of the non-precious metal-based catalysts. Importantly, the Ni2P4O12 shows a negligible potential change (6.5 mV) over 80 000 s continuous testing in acid. The remarkable catalytic performances of Ni2P4O12 are mainly attributed to the inductive effect of P4O124- and its polymer-like structure, promoting it as a potential acid-stable HER electrocatalyst.
非贵金属基析氢反应 (HER) 电催化剂的稳定性至关重要。在此，我们首次将镍环四磷酸盐 (Ni2P4O12) 纳米片阵列用作 HER 电催化剂。Ni2P4O12 阵列是通过简便的低温磷化过程获得的，在酸性条件下具有优异的 HER 催化活性和稳定性。在 0.5 M H2SO4 中，Ni2P4O12 在 -10 mA cm-2 时的过电势仅为 131.8 mV，Tafel 斜率为 47.8 mV dec-1，可与大多数非贵金属基催化剂相媲美。重要的是，Ni2P4O12 在酸性条件下连续测试 80,000 秒后，其电位变化可忽略不计（6.5 mV）。Ni2P4O12 的显著催化性能主要归因于 P4O124- 的诱导效应及其聚合物样结构，使其有望成为一种酸性稳定的 HER 电催化剂。
