Promoting electrocatalytic overall water splitting with nanohybrid of transition metal nitride-oxynitride

Boosting H2 Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

“…In the case of Co(OH) 2 @HOS/CP electrode, a cell voltage of 1.631 V is needed to achieve the current density of 10 mA cm −2 in 1 m KOH in the absence of methanol. In fact, this potential is lower than those of recently reported Co‐based electrodes for overall water splitting, such as cobalt nitridevanadium oxynitride nanohybrid (1.64 V for 10 mA cm −2 ), cobalt iron hydroxide (1.64 V for 10 mA cm −2 ), 3D Co(OH) 2 @NCNTs@NF (1.72 V for 10 mA cm −2 ), Co(OH) 2 –Au–Ni(OH) 2 (1.75 V for 10 mA cm −2 ), and CoO x (OH) y /C nanocomposites (1.80 V for 10 mA cm −2 ) . Interestingly, the LSV curve of MFO coupled with HER dramatically shifts to more negative potentials, and the cell voltage is reduced to 1.497 V at the current density of 10 mA cm −2 , suggesting much better energy conversion efficiency by replacing OER with MFO.…”

Defect‐Rich Heterogeneous MoS2/NiS2 Nanosheets Electrocatalysts for Efficient Overall Water Splitting

“…Further, the OER performances of MoS 2 /NiS 2 -3 are competitive among the current noble-metal-free catalysts (Table S2, Supporting Information). [40] The chronopotentiometric curve of MoS 2 /NiS 2 -3 electrode in Figure S9b in the Supporting Information shows no obvious changes in every step, suggesting the good conductivity, excellent mass transport, and mechanical properties in OER tests. It indicates that the MoS 2 /NiS 2 -3 proceeds a faster OER kinetic.…”

“…[40] The chronopotentiometric curve of MoS 2 /NiS 2 -3 electrode in Figure S9b in the Supporting Information shows no obvious changes in every step, suggesting the good conductivity, excellent mass transport, and mechanical properties in OER tests. [40,41] To investigate the stability for OER, a long-time chronopotentiometry measurement was carried out at 10 and 50 mA cm −2 . The C dl of 6.32 mF cm −2 on MoS 2 /NiS 2 -3 is much higher than that of pure NiS 2 (2.70 mF cm −2 ).…”

Porosity‐Engineering of MXene as a Support Material for a Highly Efficient Electrocatalyst toward Overall Water Splitting

“…However, its half reactions, especially the anodic oxygen evolution reaction (OER), suffer from sluggish electron‐transfer kinetics that lead to low‐efficiency energy conversion . Precious‐metal‐based electrocatalysts exhibit the highest catalytic activity to reduce the overpotential requirement, but the high cost, scarcity and low stability of these catalysts have hindered their widespread application greatly . Therefore, substantial efforts have been devoted to develop highly efficient and inexpensive materials by reducing the noble metal usage or by exploring viable alternatives .…”

“…[1][2][3][4][5] Precious-metal-based electrocatalysts exhibit the highest catalytic activity to reduce the overpotential requirement, but the high cost, scarcity and low stabilityo ft hesec atalysts have hindered their widespread application greatly. [6][7][8][9][10][11][12] Therefore, substantial efforts have been devotedt od evelop highly efficient and inexpensive materials by reducing the noblem etal usage or by exploring viable alternatives. [7,8,[13][14][15][16][17][18][19][20] There are two common approaches to enhance the activity of an electrocatalyst: ( 1) by increasing the quality of each active site (e.g.,n ormally by modulating the electronic configuration) and (2) by increasing the number of active sites at as pecific mass loading and electrode area (e.g., by engineering the structure and morphology to expose more active sites).…”