Nanostructured NaFeS2 as a cost-effective and robust electrocatalyst for hydrogen and oxygen evolution with reduced overpotentials

Erdite NaFeS2 as a New Anode Material for Lithium-Ion Batteries

“…The Fe 2p orbit consists of Fe 3+ 2p3/2 (710.37 eV), Fe 3+ 2p1/2 (723.86 eV), and two satellite peaks (717.89 and 730.70 eV). The S 2p orbit was divided into S 2– 2p3/2 (160.38 eV), S 2– 2p1/2 (161.54 eV), S 2 2– (162.38 eV), and SO 4 2– (168.03 eV) . Furthermore, the O 1s was delivered into three situations (Figure S7e): structure H 2 O (530.95 eV), FeO x (529.35 eV), and SO 4 2– (532.33 eV) .…”

“…In the full X-ray photoelectron spectra (XPS) of NaFeS 2 •2H 2 O (Figure S7b) and FeS 2 (Figure S8a), characteristic element orbits (S, Fe, O) can be surveyed, where the existence of Na in NaFeS 2− (168.03 eV). 33 Furthermore, the O 1s was delivered into three situations (Figure S7e): structure H 2 O (530.95 eV), FeO x (529.35 eV), and SO 4 2− (532.33 eV). 34 The binding energy of Na 1s appears at 1071.00 eV (Figure S7f).…”

The Pivotal Role of s‐, p‐, and f‐Block Metals in Water Electrolysis: Status Quo and Perspectives

“…NNTM‐based oxides and oxyhydroxides are considered as the potential OER electrocatalysts, while NNTM‐based chalcogenides usually are good candidates for HER reactions. [ 135 ] In this context, NaFeS 2 , [ 136 ] as well as, a series of Li/Na/K‐tuned Co 9 S 8 [ 137 ] and WSe 2 [ 138 ] were synthesized and investigated as HER electrocatalysts. The incorporation of alkali metals greatly enhanced the conductivity and optimized the free adsorption energy toward H‐intermediate, making these electrocatalysts deliver an outstanding HER activity comparable to those of Pt‐based electrocatalysts.…”

“…Moreover, several comparative works substantiated that the NNTM catalysts containing SPFM species could stabilize their robust catalytic capability in HER, OER, and overall water splitting with less deactivation, compared with the associated pristine NNTM or directly synthesized NNTM-based (oxy)hydroxides. [136,225,236,261,262] The high operation stability should be closely related to the chemical and structural stability of the electrocatalyst. As it is well-known that the chemical stability of active NNTM species is vital for the long-term application of NNTM-based catalysts, the easy leaching of the active TM during water splitting has already been verified, especially the Fe species in the benchmark NiFebased OER catalysts.…”

Efficient and Durable Cu3P-FeP for Hydrogen Evolution from Seawater with Current Density Exceeding 1 A cm–2

“…However, the production of hydrogen by the alkaline electrolysis of water also faces many challenges, such as the sluggish kinetics of hydrogen evolution reaction (HER) and the high cost of Pt-based compounds electrocatalysts. Thus, researchers are committed to researching new nonprecious metal catalysts with abundant reserves, low cost, and excellent effect, such as transition-metal oxides, − sulfides, − phosphides, − nitrides, − carbides, − and so forth, which greatly promote the industrial application of electrocatalytic water splitting. Among these catalysts, transition-metal phosphides (TMPs) have received extensive attention for two main reasons: first, P has a relatively large electronegativity, which can easily attract hydrogen intermediates in the electrolyte and improve the activity of HER.…”