Constructing self-supported Pt/MoO2 on molybdenum mesh for a highly efficient hydrogen evolution reaction†
a
Jian
Zhang,
b
Heng
Zhang,
*d
Guilong
Liu,
a
Naiteng
Wu,
*a
Changzhou
Yuan
*e
and
Xianming
Liu
*a
Abstract
It is an effective strategy to enhance platinum (Pt) utilization and lower the catalyst cost by loading Pt on a self-supported electrode. In this work, we employ a molybdenum (Mo) mesh both as the source of Mo and the self-supported electrode. Through a successful combination of the spray and calcination methods, Pt is efficiently loaded onto the self-supported molybdenum dioxide (MoO2) electrode, achieving a Pt loading content of only ∼0.67 wt%. Simultaneously, three-dimensional (3D) MoO2 exhibits a structure comprised of nanosheets, each possessing perforations. As expected, the prepared electrocatalyst demonstrates exceptional performance, manifesting an overpotential of 26.8 mV at −10 mA cm−2, a Tafel slope of 59.2 mV dec−1, and a noteworthy durability of over 240 hours. Both experimental studies and theoretical calculations affirm that the catalyst's outstanding performance stems from the strong interaction between Pt and MoO2, the distinctive structure of MoO2 with perforated nanosheets, and the self-supporting characteristics of the electrode. This work introduces an efficient method for constructing self-supporting heterojunctions, thereby advancing the development of electrocatalytic hydrogen evolution.
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