Xing Zhicai, Wang Dewen, Meng Tian, Yang Xiurong
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
University of Science and Technology of China, Hefei 230026, Anhui, China.
ACS Appl Mater Interfaces. 2020 Sep 2;12(35):39163-39169. doi: 10.1021/acsami.0c10476. Epub 2020 Aug 20.
NiS has attracted great interest as a potential alternative catalyst for the oxygen evolution reaction; however, the formation of sulfur-hydrogen bonds on NiS suppressed the hydrogen evolution reaction (HER), which remains a significant challenge in interface engineering of NiS structures for enhancing its HER performance. Herein, we demonstrate an efficient strategy for constructing a Pt nanoparticle-decorated NiS microrod array supported on Ni foam (Pt/NiS/NF) by electrodeposition of Pt nanoparticles on hydrothermally synthesized NiS/NF. The Pt/NiS/NF heterostructure array exhibits an extremely low overpotential of 10 mV at 10 mA cm, surpassing that of commercial Pt/C and representing the best alkaline HER catalysts to date. Impressively, at an overpotential of 0.15 V, Pt/NiS/NF displays a Pt mass activity and a normalized current density (against the electrochemical surface area) of 5.52 A mg and 1.84 mA cm, respectively, which are 8.8 and 15.3 times higher compared to those of Pt/C, respectively. In addition, this electrode also shows much enhanced catalytic performance and stability in neutral media. Such enhanced HER activities are attributed to the constructed interface in the Pt/NiS heterostructure array, which synergistically favor water dissociation and subsequent hydrogen evolution, which is supported by density functional theory calculations.
硫化镍作为析氧反应的潜在替代催化剂引起了极大关注；然而，硫化镍上硫氢键的形成抑制了析氢反应（HER），这在硫化镍结构的界面工程中仍是提高其析氢性能的重大挑战。在此，我们展示了一种通过在水热合成的硫化镍/泡沫镍（NiS/NF）上电沉积铂纳米颗粒来构建负载在泡沫镍上的铂纳米颗粒修饰的硫化镍微棒阵列（Pt/NiS/NF）的有效策略。Pt/NiS/NF异质结构阵列在10 mA cm时表现出极低的过电位10 mV，超过了商业Pt/C，是迄今为止最好的碱性析氢催化剂。令人印象深刻的是，在0.15 V的过电位下，Pt/NiS/NF的铂质量活性和归一化电流密度（相对于电化学表面积）分别为5.52 A mg和1.84 mA cm，分别是Pt/C的8.8倍和15.3倍。此外，该电极在中性介质中也表现出大大增强的催化性能和稳定性。这种增强的析氢活性归因于Pt/NiS异质结构阵列中构建的界面，它协同促进水的解离和随后的析氢，这得到了密度泛函理论计算的支持。
