Hydrodesulfurization properties of cobalt–nickel phosphide catalysts: Ni-rich materials are highly active

Tunable and Specific Formation of C@NiCoP Peapods with Enhanced HER Activity and Lithium Storage Performance

“…[19,23,35] The two peaks at 130.4 and 129.6 eV agree wellw ithP2p 1/2 and P2 p 3/2 from NiCoP.T he results are consistentw ith the previous observations that the P2 pr egion of transition-metal phosphides usually splits into two peaks for P2 p 1/2 and P2 p 3/2 in high resolution XPS spectra. [19,21,35] Furthermore, the spectrum of P2 pa lso presentsapeak with ah igh BE of 133.6 eV,w hich could be attributed to PO 4 3À or P 2 O 5 caused by oxidationd ue to air contact. [19,21,35] Similarly,r esults are obtained from the XPS spectra of Co 2 Pb ulks, as shown in Figure 5b.O bviously,t he peaks of Co 2 Pb ulk correspond to those of previously reported purephased Co 2 P. [34][35][36] The HER activities of C@Ni 2 P, C@Ni 1.5 Co 0.5 P, and C@NiCoP and Co 2 Pb ulks are measured in 0.5 m H 2 SO 4 using at ypical threeelectrode setup.…”

“…have receivedcontinuous attention in recenty ears owing to their synergy efficiencya fforded by ternary phases. [18][19][20] Early studies have found that the Ni 2Àx Co x Pn anostructure as ac atalyst for hydrodesulfurization(HDS) and hydrodenitrogenation (HDN) exhibits improved activities relative the best of Ni 2 P. [19,[21][22] In 2014, Peng and co-workers studied the HER activitiesa nd stabilitieso ft he nanoscalem agnetic metal phosphides including Co 2 P, Co 1.33 Ni 0.67 P, and Ni 2 Pn anorods. The resultss how the best HER catalyst is Co 2 P, followedby Co 1.33 Ni 0.67 P, and Ni 2 Pn anorods.…”

“…Moreover,m ost of the conventional nanostructured NiCoP materials are SiO 2 -supported and were generally synthesized by temperature-programmed reduction( TPR) or solid-state metathesis, with other routes being seldom reported. [21][22][24][25] Usually,m aterials developed by these synthetic strategies presentl arger-diameter,i rregularshaped and small specific surfacea rea. As far as we know,t he morphology and structureh ave great influence on the performance of materials.…”

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

“…Many studies [98,99,100] have shown that the active phase is a phosphosulfide. It has been found that small amounts of Co in Ni x Co y P catalysts are promoters [33], and it should be interesting to probe the reactivity of small amounts (< 15 mol%) of Fe in NiFeP catalysts.…”

“…A number of bimetallic phosphides such as Ni x Mo y P [25][26][27][28][29][30], Co x Mo y P [31] and Ni x Co y P [32,33] have also been studied because a synergistic effect between the components was foreseen as found for promoted metal sulfides. Unexpectedly, however, these bimetallic phosphide phases did not show enhanced activity over the component Ni, Co or Mo phosphides, except for the case of Co x Ni y P [20] where a 50% increase in conversion was found.…”