Toward the fast and durable alkaline hydrogen oxidation reaction on ruthenium

Abstract

Anion exchange membrane fuel cells (AEMFCs) are becoming highly attractive for efficient utilization of hydrogen energy due to the rapid development of platinum group metal (PGM)-free electrocatalysts for the cathodic...

Hydroxyl‐Binding Energy‐Induced Kinetic Gap Narrowing between Acidic and Alkaline Hydrogen Oxidation Reaction on Intermetallic Ru3Sn7 Catalyst

“…[1][2][3][4][5][6] Nonetheless, the sluggish kinetics of anodic hydrogen oxidation reaction (HOR) in alkaline electrolyte severely limits the commercial application of AEMFC. [7][8][9] The kinetics of HOR under alkaline media is much more complicated than that in acidic electrolyte, leading to significant discrepancy of HOR kinetics between acidic and alkaline electrolytes, that is, the kinetics of alkaline HOR, even for the benchmark Pt/C, is more than two orders of magnitude lower than that in acidic electrolyte. [10,11] Consequently, compared with PEMFC, much higher Pt loading is required in the anode to maintain the performance of AEMFC, resulting in unaffordable system cost.…”

Metastable Metal–Alloy Interface in RuNi Nanoplates Boosts Highly Efficient Hydrogen Electrocatalysis

“…Hydrogen related catalyses, including the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR), are among the key reactions in hydroxide exchange membrane fuel cells (HEMFCs) and H 2 fuel cells, providing an important pathway to a hydrogen economy for clean energy development. − However, the efficiencies of both reaction media remain much slower in alkaline than those in acidic media . Therefore, a rational design of unique structure to improve the reaction performance is highly appreciated.…”

“…Ruthenium (Ru) has fast hydrolysis kinetics, reasonable hydrogen binding, and oxyphilic ability to achieve balanced adsorption of OH ad and H ad at low anode potentials, , being an excellent candidate for HER and HOR reactions. , Meanwhile, the stable phase structure of Ru is hexagonal-close-packed (hcp), the same as the metastable phase of Ni. So, the construction of the interface structure between metastable Ni and Ru may provide an effective way to stabilize the metastable Ni hcp phase.…”

“…1−4 However, the efficiencies of both reaction media remain much slower in alkaline than those in acidic media. 5 Therefore, a rational design of unique structure to improve the reaction performance is highly appreciated.…”

Fast and Durable Alkaline Hydrogen Oxidation Reaction at the Electron‐Deficient Ruthenium–Ruthenium Oxide Interface

“…[8] Therefore, to a certain degree, Rubased electrocatalyst can be regarded as an ideal potential alternative to Pt toward HOR in alkaline media. [9][10][11] Unfortunately, metallic Ru could not maintain sufficient oxide-free surface for bonding with H ad with increasing the anodic potential, since it is susceptible to be oxidized at elevated anodic potentials (>0.1 V vs RHE). [10,12] As a result, the catalytic performance of Ru-based electrocatalysts generally decays rapidly at relatively high anode potentials.…”