多金属氧酸盐
塔菲尔方程
化学
过电位
纳米柱
金属有机骨架
催化作用
电极
电催化剂
可逆氢电极
化学工程
纳米棒
无机化学
纳米技术
吸附
电化学
纳米结构
材料科学
物理化学
工作电极
有机化学
工程类
作者
Lei Wang,Ani Wang,Zhen‐Zhen Xue,Ji‐Xiang Hu,Song‐De Han,Guo‐Ming Wang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2022-10-28
卷期号:61 (45): 18311-18317
被引量:11
标识
DOI:10.1021/acs.inorgchem.2c03431
摘要
The rational design of 2D polyoxometalate-based metal-organic framework (POMOF) nanosheets on a conductive substrate as a self-supporting electrode is highly attractive but a great challenge. Herein is the first demonstration of POMOF nanopillar arrays consisting of 2D nanosheets as a self-supported electrode for the hydrogen evolution reaction (HER) in acidic conditions. Single-crystal X-ray analysis reveal that our as-prepared 2D [Co2(TIB)2(PMo12O40)]·Cl·4H2O [named CoMo-POMOF; TIB = 1,3,5-tris(1-imidazoly)benzene] crystalline materials are connected by Co-α-Keggin polymolybdate units act as secondary building blocks and TIB as the organic ligands. The 2D CoMo-POMOF nanosheets were successfully arrayed on a conductive nickel foam substrate by a facile CoO nanorod template-assisted strategy. Remarkably, the CoMo-POMOF nanopillar arrays demonstrate superior electrocatalytic performance toward the HER with an overpotential of 137 mV and Tafel slope of 59 mV dec-1 at 10 mA cm-2, which are comparable to those of state-of-the-art POMOF-based electrocatalysts. Density-functional theory (DFT) calculations demonstrate that the exposed bridging oxygen active sites (Oa) of Co-α-Keggin polymolybdate units in CoMo-POMOF optimize the Gibbs free energy of H* adsorption (ΔGH* = -0.11 eV) and increase the intrinsic HER activity.
科研通智能强力驱动
Strongly Powered by AbleSci AI