Synergistically Coupled CoMo/CoMoP Electrocatalyst for Highly Efficient and Stable Overall Water Splitting

Abstract

Finding reservoir-rich and efficient bifunctional electrocatalysts for water splitting is key to further sustainable energy development. Transition metal phosphides (TMPs) are extensively exploited as effective electrocatalysts, but the construction of strong coupling interfaces to improve catalytic performance by simple methods is still a bottleneck. Here, we designed and prepared a novel heterostructure electrocatalyst composed of cobalt–molybdenum (CoMo) alloy particles integrated with CoMoP nanosheets via the method of template-assisted conversion, followed by electrodeposition. Thanks to the strong interfacial coupling and synergistic effect between CoMo alloy particles and CoMoP nanosheets, the prepared CoMo/CoMoP/NF shows outstanding activity with overpotentials of only 29 mV for the hydrogen evolution reaction (HER) and 246 mV for the oxygen evolution reaction (OER) in 1 M KOH at a current density of 10 mA cm–2. Furthermore, the assembled CoMo/CoMoP || CoMo/CoMoP electrode can attain 10 mA cm–2 with a low battery voltage of 1.54 V. This study offers a valuable reference to the construction of bimetallic alloy/bimetallic phosphide heterostructure electrocatalysts, which applies to the large-scale application of electrocatalytic energy conversion technology.

Fe Engineering on Ru Nanosheets for Enhanced Hydrogen Evolution in pH-Universal Media

“…Electrochemically splitting water into molecular hydrogen is fascinating because of its sustainable and carbon-neutral features. − An alkaline water electrolyzer is closer to commercialization owing to the robustness of electrode and cheap electrolyzer construction. − Yet, the hydrogen evolution reaction (HER) in alkaline electrolyte requires a larger overpotential to overcome its sluggish kinetics . Despite platinum (Pt)-based materials being regarded as the benchmark catalysts for HER, their performance in nonacidic media is still inferior.…”

“…4−6 Yet, the hydrogen evolution reaction (HER) in alkaline electrolyte requires a larger overpotential to overcome its sluggish kinetics. 7 Despite platinum (Pt)-based materials being regarded as the benchmark catalysts for HER, their performance in nonacidic media is still inferior. Meanwhile, their practical applicability is subject to the scarcity and high price.…”

Synergizing Cobalt Ruthenium Alloy with Chromium Oxyhydroxide for Highly Efficient Electrocatalytic Water Splitting

“…In addition, compared with the Ru 3d XPS spectrum of Ru/NF and CoRu/NF, the peaks in Ru-CrOOH/NF and CoRu-CrOOH/NF shift to lower binding energy, demonstrating the electronic interaction between Ru and CrOOH. The Co 2p XPS spectra of CoRu-CrOOH/NF (Figure b) are resolved into two components corresponding to Co 0 (776.1 and 794.8 eV) and Co 3+ (781.2 and 798.1 eV), respectively . A similar negative shift also occurs in the Co 2p XPS spectra of CoRu-CrOOH/NF compared to CoRu/NF, further confirming that Co obtains electrons and will become more metallic owing to the presence of electronic interaction between CoRu and CrOOH.…”

Nano-interfacial interactions in 2-D Ni3S2–Ni3N nanosheets for the hydrogen evolution reaction in an alkaline medium

“…8 As a result, finding effective, inexpensive, and stable catalysts to meet the ever-increasing hydrogen demand is critical. In order to develop an alternative for the noble metal electrocatalysts, researchers have conducted extensive studies on non-noble metal compounds such as phosphides, [9][10][11][12] sulphides, [13][14][15][16] oxides [17][18][19][20] and nitrides. [21][22][23] Because of its remarkable catalytic efficiency and minimal cost, transition metal nickel (Ni) has drawn considerable attention for energy conversion reactions.…”