Synergistically coupling of Ni3Mo3C/Mo2C/Ti3C2Tx MXene/N-doped carbon electrocatalyst towards enhanced hydrogen evolution activity

P–Nb4C3Tx Nanosheets Fabricated by a Low-Temperature Phosphating Process as Electrocatalysts for Electrochemical Water Splitting

“…The peak of Nb–P does not appear in Figure b, indicating that the P element was not introduced in the form of Nb–P bond and may exist in the form of Nb–C–P, C–P, and O–PO . From Figure b, the C 1s spectrum of P–Nb 4 C 3 T x and Nb 4 C 3 T x presents five primary peaks, which are put down to 288.6 eV (O–CO), 286.3 eV (C–H), 285.7 eV (C–P), 284.8 eV (C–C), and 282.2 eV (C–Nb). , The XPS spectrum of P 2p for P–Nb 4 C 3 T x and Nb 4 C 3 T x presents the main peaks at about 134.3 and 133.5 eV, and they are relevant to O–PO 2p 1/2 and 2p 3/2 , showing the successful introduction of the P element (Figure c). The formation of O–PO bonds can also prove that the P atom combines with the Nb 4 C 3 T x surface functional group (−O) to form an efficient electrocatalyst.…”

“…EIS data are processed by an equivalent circuit as shown in Figure d inset. The semicircle diameter represents the interface charge-transfer resistance ( R ct ) . In the Nyquist curves, P–Nb 4 C 3 T x has the smallest charge-transfer resistance as low as 1.89 Ω, which shows the superiority of low-temperature phosphating to promote the electrocatalytic performance of P–Nb 4 C 3 T x .…”

Free-standing multi-hierarchical MoC-based catalyst for pH-universal hydrogen evolution reaction at ultra-high current density

“…5h and Table S1 †). [33][34][35][36][37][38][39][40][41][42][43] The HER performance of the P-MoC/Ni@NCNTs-MoC@C catalyst is further investigated in alkaline conditions. The P-MoC/Ni@NCNTs-MoC@C displays optimal catalytic activities with lower overpotentials (97.2 mV) at 100 mA cm −2 are markedly smaller than those of MoC/Ni@NCNTs-MoC@C (145.9 mV), MoC-Mo mesh (306.6 mV), and Mo mesh (439.2 mV) in 1 M KOH, respectively (Fig.…”

“…6h and Table S2 †). 14,34,35,[44][45][46][47][48][49][50][51][52][53] Similarly, the P-MoC/Ni@NCNTs-MoC@C also demonstrates excellent HER performance in neutral conditions. As expected, P-MoC/Ni@NCNTs-MoC@C could achieve 567.9 mV at 1000 mA cm −2 , surpassing all the reference samples (Fig.…”

Recent progress in bimetallic carbide-based electrocatalysts for water splitting

“…Heterogeneous structures of both bimetallic carbides and monometallic carbides were also accomplished by a controlled carbonization process, showing excellent activity and good long-term stability in both acid and alkaline electrolytes. 106 The electrochemical measurements revealed that Ni 3 Mo 3 C/Mo 2 C/Ti 3 C 2 T x /NC presents remarkable HER performance with low overpotentials (Tafel slope) of 99 mV @10 mA cm À2 (58 mV dec À1 ) in 0.5 M H 2 SO 4 as well as 98 mV @10 mA cm À2 (69 mV dec À1 ) in 1.0 M KOH and good stability sustained for 24 h in different media. The rapid charge transfer pathway provided by Ti 3 C 2 T x MXene, the multifunctional catalytic interface among Ni 3 Mo 3 C/Mo 2 C, NC, and Ti 3 C 2 T x as well as the protective effect of the carbon layer collectively lead to better HER performance.…”