Reactive template‐derived interfacial engineering of CoP/CoO heterostructured porous nanotubes towards superior electrocatalytic hydrogen evolution

Abstract

The development of economical, efficient, and robust electrocatalysts toward the hydrogen evolution reaction (HER) is highly imperative for the rapid advancement of renewable H 2 energy-associated technologies. Extensive utilization of the heterointerface effect can endow the catalysts with remarkably boosted electrocatalytic performance due to the modified electronic state of active sites. Herein, we demonstrate deliberate crafting of CoP/CoO heterojunction porous nanotubes (abbreviated as CoP/CoO PNTs hereafter) using a self-sacrificial template-engaged strategy. Precise control over the Kirkendall diffusion process of the presynthesized cobalt-aspartic acid complex nanowires is indispensable for the formation of CoP/CoO heterostructures. The topochemical transformation strategy of the reactive templates enables uniform and maximized construction of CoP/CoO heterojunctions throughout all the porous nanotubes. The establishment of CoP/ CoO heterojunctions could considerably modify the electronic configuration of the active sites and also improve the electric conductivity, which endows the resultant CoP/CoO PNTs with enhanced intrinsic activity. Simultaneously, the hollow and porous nanotube architectures allow sufficient accessibility of exterior/interior surfaces and molecular permeability, drastically promoting the reaction kinetics. Consequently, when used as HER electrocatalysts, the Carbon Energy.

Bifunctional Cobalt–Nickel Sulfide Nanoflowers as Electrocatalysts for Concurrent Energy-Efficient Hydrogen Production and Sulfur Recycling

“…As shown in Figure S4b, the survey XPS spectra of CoNi-Pre and CoNi 2 S 4 NFs display obvious Co 2p and Ni 2p signals, while the peak of S 2p only appeared in CoNi 2 S 4 NFs, indicating that the S element was introduced into CoNi-Pre. Notably, compared with CoNi-Pre, the Co 2p and Ni 2p orbitals of CoNi 2 S 4 NFs have positive offsets by 0.48 and 0.41 eV, respectively, indicating electron transformation from Co and Ni to S. The high-resolution Co 2p XPS spectra of CoNi 2 S 4 NFs display two chemical states, corresponding to Co (III) at 780.4 (2p 3/2 ) and 795.2 eV (2p 1/2 ) and Co (II) at 782.3 (2p 3/2 ) and 797.8 eV (2p 1/2 ), while the satellite peaks are located at 785.6 and 803.7 eV (Figure b). , The valence state of cobalt changes from trivalent to bivalent, indicating that cobalt has a process of gaining electrons during sulfuration . Similarly, the Ni 2p 3/2 and Ni 2p 1/2 peaks for Ni (II) species are situated at 855.1 and 872.5 eV, and two satellite peaks are located at 862.9 and 881.4 eV, respectively (Figure c) .…”

“…As shown in Figure S4b 2b). 44,45 The valence state of cobalt changes from trivalent to bivalent, indicating that cobalt has a process of gaining electrons during sulfuration. 46 Similarly, the Ni 2p 3/2 and Ni 2p 1/2 peaks for Ni (II) species are situated at 855.1 and 872.5 eV, and two satellite peaks are located at 862.9 and 881.4 eV, respectively (Figure 2c).…”

Sulfur and phosphorus co-doping optimized electronic structure and modulated intermediate affinity on PdSP metallene for ethanol-assisted energy-saving H2production

“…Hydrogen has attracted attention due to its advantages of ecological friendliness and high energy density, which makes it widely applied. [1][2][3] Electrochemical water splitting is a promising way to produce highly purified hydrogen. In a typical water splitting process, high voltages are indispensable for catalysts to drive the reaction mainly because of the slow reaction kinetics of the anodic oxygen evolution reaction (OER), which greatly confines the industrial application.…”

Yttrium-doped cobalt-based metal–organic frameworks for selective electrooxidation of glycerol coupled with hydrogen production

“…1 Electrolysis of water is a promising way to produce green hydrogen on a large scale. 2,3 However, the kinetics of the anodic oxygen evolution reaction (OER) for the classical water electrolysis mode is slow and the added value of the produced oxygen is low. 4,5 Therefore, to make the electrolytic hydrogen production more energy and cost efficient, it is crucial to find thermodynamically more favorable anodic oxidation reactions with value-added products instead of oxygen to replace the OER.…”