Align chemical equation with potential

Question

I want to make numbered chemical equation with the potential of that equation on the right. This is what I have:

\begin{align}
\label{eq:NiOOH}
    \ce{NiOOH + H2O + e- &<=>[discharge][charge] Ni(OH)2 + OH-}
    \tagaddtext{[$E_0,red=0,52$ \si{\volt}]}
\end{align}

For most of the equations this work, however if equation is too long it overlapse with potential:

I tried to align equation to the left with FLALIGN, but there was no change.

All other complex equations looks the same:

Answer 1

\documentclass{article}
\usepackage{chemmacros}
\usechemmodule{reactions}
\usepackage{siunitx}

\begin{document}

\begin{reaction}
    NiOOH + H2O + e- <=>[discharge][charge] Ni(OH)2 + OH-
     $\qquad[E_0,red=\SI{0,52}{\volt}]$ \label{rct:NiOOH}
\end{reaction}

\end{document}

Answer 2

I propose this MWE and I have get this using for the double arrow chemarrow package. Of course you can always use the specific chemmacros package. For the use of \tagaddtext from this site, you must add the code:

\makeatletter
\providecommand\add@text{}
\newcommand\tagaddtext[1]{%
  \gdef\add@text{#1\gdef\add@text{}}}% 
\renewcommand\tagform@[1]{%
  \maketag@@@{\llap{\add@text\quad}(\ignorespaces#1\unskip\@@italiccorr)}%
}
\makeatother

---

It is very important that you add a minimal complete compilable code.

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage[margin=2cm]{geometry}
\usepackage{chemarrow}
\usepackage{siunitx}
\sisetup{detect-all}

\makeatletter
\providecommand\add@text{}
\newcommand\tagaddtext[1]{%
  \gdef\add@text{#1\gdef\add@text{}}}% 
\renewcommand\tagform@[1]{%
  \maketag@@@{\llap{\add@text\quad}(\ignorespaces#1\unskip\@@italiccorr)}%
}
\makeatother

\begin{document}
\begin{align}
\mathrm{NiOOH + H_2O + e^-} \autorightleftharpoons{discharge}{charge} \mathrm{Ni(OH)_2 + OH^-}& &\tagaddtext{$[E_0, \text{red}=0.52 \si{\volt}]$}
\label{eq:NiOOH}
\end{align}
\end{document}