fig2

Figure 2. (A) XRD patterns of aCoP@CNTs and cCoP@CNTs; (B) full-scan XPS spectra of aCoP@CNTs; (C) Co 2p HRXPS spectra of aCoP@CNTs and cCoP@CNTs, HRXPS spectra of aCoP@CNTs: (D) P 2p; (E) N 1s; (F) C 1s.