Industrially Promising Nanowire Heterostructure Catalyst for Enhancing Overall Water Splitting at Large Current Density

Abstract

Developing a highly effective and durable bifunctional non-noble catalyst is necessary for water electrolysis. In this work, we synthesize the N-doped carbon-coated Ni−MoO 2 nanowire heterostructure catalyst anchored on nickel foam for boosting the hydrogen and oxygen evolution reaction (HER and OER). Electrochemical results indicate that it exhibits low overpotentials for HER (50 and 304 mV) and OER (240 and 400 mV) at ±10 and ±2000 mA cm −2 . Furthermore, it can keep for 340 h under a multicurrent-process condition (10−1500 mA cm −2 ) as a cathode and anode without obvious attenuation. The outstanding performance could be ascribed to the heterostructure existing in Ni and MoO 2 , N-doped-carbon coating structure, and nanowire architecture anchored on nickel foam. This work could provide an industrially promising, cheap, and green method for hydrogen production.

Triggering the Intrinsic Catalytic Activity of Ni-Doped Molybdenum Oxides via Phase Engineering for Hydrogen Evolution and Application in Mg/Seawater Batteries

“…Recently, molybdenum-based materials, including molybdenum oxides (MoO 3 and MoO 2 ) − and other compounds (like MoS 2 , − MoSe 2 , MoN, and Mo 2 C , ) have attracted particular interests for HER due to their extensive variations and tunable features. Among them, molybdenum oxides (MoO 3 and MoO 2 ) as low-cost, nontoxic, and thermodynamically stable compounds have been extensively explored as HER catalysts. ,− Nevertheless, there remains a considerable gap in the HER performance between molybdenum oxides and Pt-based metals.…”

Layered Ni−Co−P Electrode Synthesized by CV Electrodeposition for Hydrogen Evolution at Large Currents

“…To analyze the electrochemically active specific surface area (ECSA) of samples with different deposition circles, the double layer capacitance (C dl ) was measured by linear cyclic voltammetry (Figure S2d), because C dl is proportional to the ECSA [38] . The voltage is set to the range (‐1.0 to −1.05 V vs. SCE) without Faraday current.…”

Engineering transition metal catalysts for large-current-density water splitting

“…MoO 2 @C/NF)). 84 Benefitting from the heterostructure existing in Ni and MoO 2 , N-doped carbon coated structure, and distinct 1D nanowire, such a Ni-MoO 2 @C/NF electrode can function as bifunctional electrocatalysts for boosting HER and OER, which requires the overpotentials of 304 and 400 mV to reach 2000 mA cm −2 , respectively. More recently, Guo et al realized the apparent HER activity enhancement in the MoO 3 catalyst by coupling with graphdiyne (GDY).…”