Co2P nanoparticles supported on cobalt-embedded N-doped carbon materials as a bifunctional electrocatalyst for rechargeable Zn-air batteries

Hollow FeNi@NCG Materials Prepared with a Double-template Strategy as Highly Efficient Catalysts for Rechargeable Zn-air Batteries

“…5,66,67 The reversible oxygen electrode activity is obtained via the potential difference between the E J = 10 in OER and E 1/2 in ORR with formula of ΔE = E J = 10 -E 1/2 . 68,69 Figure 6a reveals that ΔE of Fe 1 Ni 1 @NCG-700 is as low as 0.625 V after iR-correction, narrower than the commercial Pt/C-RuO 2 (ΔE = 0.636 V) mixture, proving the better bifunctional electrochemical performances. Inspired by the prominent OER and ORR properties of Fe 1 Ni 1 @NCG-700 catalyst, the aqueous Zn-Air battery (ZAB) lies in Zn plate as anode, Fe 1 Ni 1 @NCG-700 catalysts modified carbon paper as air cathode, and KOH(6 M)-Zn(Ac) 2 (0.2 M) solution as electrolyte was assembled to evaluate its practical application prospects (inset of Figs.…”

Boosting oxygen reduction of well-dispersed CoP/V(PO3)3 sites via geometric and electronic engineering for flexible Zn–air batteries

“…46 The presence of P-O bonds is attributed to not only phosphate but also the adsorption of oxygen on the surface of phosphorus species, implying a strong interaction of materials with oxygen-containing intermediates. 47 Overall, the optimized electronic structure generated by the strong interaction between CoP and V(PO 3 ) 3 with different electro-affinities must lead to an appropriate adsorption capacity for intermediate species, facilitating the ORR kinetics. 48,49 The ORR performances of catalysts were measured in 0.1 M KOH solutions (either N 2 -or O 2 -saturated) and the measured potential was converted to the RHE using the Nernst equation (Fig.…”

Emerging transition metal and carbon nanomaterial hybrids as electrocatalysts for water splitting: a brief review

“…Enhancing the number of catalytically active sites by decreasing particle size of the catalyst, facilitating mass and electron transport by inducing porosity in the structure, and achieving high stability and conductivity by the integration of carbon nanomaterials are the best strategies in this regime. [201][202][203] Some of the typical TM/N-CNMs catalysts for OER include MN 4 C 4 where M stands for Ni, Co or Fe, 204 Co 2 P/Co-N-C, 205 Co-NC/CoFe, 206 Co/N-CNTs, 207 Ni and N doped nano porous graphene, 208 NiFe 3 alloy supported on nitrogen-doped graphene hollow spheres (NGHS) entangled with N-doped carbon nanotubes (NCNTs) (NiFe 3 @NGHS-NCNTs), 209 CNH-D-NiMOF-400, 210 Ni nanoparticles supported in N-CNTs (Ni NPs@N-CNTs) 211 and nitrogen doped quantum dots supported on Ni 2 P nanoparticles (N-C QDs/Ni 2 P). 212 It should be noted that most of the TM/N-CNMs hybrids for OER catalysis are cobalt and nickel based materials, among which nickel based materials show better performance in most of the cases.…”

“…Among Co based TMs/N-CNMs hybrids as OER catalysts, Co 2 P/Co–N–C 205 bears an OER overpotential of 420 mV to achieve 10 mA cm −2 in 0.1 M KOH solution, which is 40 and 70 mV lower, respectively, than the reference catalysts of RuO 2 and Co–N–C, and this overpotential is also lower than the reported values of 460 mV for Co-NC/CoFe 206 and 500 mV for Co/N-CNTs. 207 The Tafel slope of Co 2 P/Co–N–C (115 mV dec −1 ) was also lower than that of RuO 2 (119 mV dec −1 ) and Co–N–C (130 mV dec −1 ).…”