A PdAg-CeO2 nanocomposite anchored on mesoporous carbon: a highly efficient catalyst for hydrogen production from formic acid at room temperature

Abstract

The efficient and selective dehydrogenation of formic acid by a robust solid catalyst at room temperature is highly attractive for a fuel cell-based hydrogen economy but still very challenging. Although significant progress has been achieved in the development of heterogeneous catalysts, their catalytic performance remains inadequate. Herein, we report a facile and surfactant-free method for the anchoring of the PdAg-CeO₂ nanocomposite (3.6 nm in diameter) onto mesoporous carbon (denoted as PdAg-CeO₂/MC). The optimized PdAg-CeO₂/MC catalyst exhibited an exceedingly high catalytic activity (turnover frequency, 2272.8 h⁻¹ at 303 K and 5275.5 h⁻¹ at 333 K) with a 100% hydrogen selectivity, among the highest catalytic performances reported to date for all heterogeneous catalysts for formic acid dehydrogenation. Systematic studies indicated that strong synergistic interactions between PdAg-CeO₂ nanocomposites and the MC host were realized due to the presence of amorphous CeO₂ with abundant oxygen vacancies for coordination; the excellent catalytic results indicated more possibilities for the effective application of formic acid as a promising hydrogen storage material.